telephony/dataconnection/DataConnection.java

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.internal.telephony.dataconnection;


import com.android.internal.telephony.CommandException;
import com.android.internal.telephony.DctConstants;
import com.android.internal.telephony.Phone;
import com.android.internal.telephony.PhoneBase;
import com.android.internal.telephony.PhoneConstants;
import com.android.internal.telephony.RILConstants;
import com.android.internal.telephony.RetryManager;
import com.android.internal.util.AsyncChannel;
import com.android.internal.util.Protocol;
import com.android.internal.util.State;
import com.android.internal.util.StateMachine;

import android.app.PendingIntent;
import android.net.LinkCapabilities;
import android.net.LinkProperties;
import android.net.ProxyProperties;
import android.os.AsyncResult;
import android.os.Message;
import android.os.SystemClock;
import android.os.SystemProperties;
import android.text.TextUtils;
import android.telephony.Rlog;
import android.telephony.TelephonyManager;
import android.util.Patterns;
import android.util.TimeUtils;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * {@hide}
 *
 * DataConnection StateMachine.
 *
 * This a class for representing a single data connection, with instances of this
 * class representing a connection via the cellular network. There may be multiple
 * data connections and all of them are managed by the <code>DataConnectionTracker</code>.
 *
 * A recent change is to move retry handling into this class, with that change the
 * old retry manager is now used internally rather than exposed to the DCT. Also,
 * bringUp now has an initialRetry which is used limit the number of retries
 * during the initial bring up of the connection. After the connection becomes active
 * the current max retry is restored to the configured value.
 *
 * NOTE: All DataConnection objects must be running on the same looper, which is the default
 * as the coordinator has members which are used without synchronization.
 */
public final class DataConnection extends StateMachine {
    private static final boolean DBG = true;
    private static final boolean VDBG = true;
    private static final boolean DEBUGGABLE = SystemProperties.getInt("ro.debuggable", 0) == 1;

    /** Retry configuration: A doubling of retry times from 5secs to 30minutes */
    private static final String DEFAULT_DATA_RETRY_CONFIG = "default_randomization=2000,"
        + "5000,10000,20000,40000,80000:5000,160000:5000,"
        + "320000:5000,640000:5000,1280000:5000,1800000:5000";

    /** Retry configuration for secondary networks: 4 tries in 20 sec */
    private static final String SECONDARY_DATA_RETRY_CONFIG =
            "max_retries=3, 5000, 5000, 5000";

    // The data connection controller
    private DcController mDcController;

    // The Tester for failing all bringup's
    private DcTesterFailBringUpAll mDcTesterFailBringUpAll;

    private static AtomicInteger mInstanceNumber = new AtomicInteger(0);
    private AsyncChannel mAc;

    // Utilities for the DataConnection
    private DcRetryAlarmController mDcRetryAlarmController;

    // The DCT that's talking to us, we only support one!
    private DataConnectionTrackerBase mDct = null;

    /**
     * Used internally for saving connecting parameters.
     */
    static class ConnectionParams {
        int mTag;
        ApnContext mApnContext;
        int mInitialMaxRetry;
        int mProfileId;
        Message mOnCompletedMsg;

        ConnectionParams(ApnContext apnContext, int initialMaxRetry, int profileId,
                Message onCompletedMsg) {
            mApnContext = apnContext;
            mInitialMaxRetry = initialMaxRetry;
            mProfileId = profileId;
            mOnCompletedMsg = onCompletedMsg;
        }

        @Override
        public String toString() {
            return "{mTag=" + mTag + " mApnContext=" + mApnContext
                    + " mInitialMaxRetry=" + mInitialMaxRetry + " mProfileId=" + mProfileId
                    + " mOnCompletedMsg=" + msgToString(mOnCompletedMsg) + "}";
        }
    }

    /**
     * Used internally for saving disconnecting parameters.
     */
    static class DisconnectParams {
        int mTag;
        ApnContext mApnContext;
        String mReason;
        Message mOnCompletedMsg;

        DisconnectParams(ApnContext apnContext, String reason, Message onCompletedMsg) {
            mApnContext = apnContext;
            mReason = reason;
            mOnCompletedMsg = onCompletedMsg;
        }

        @Override
        public String toString() {
            return "{mTag=" + mTag + " mApnContext=" + mApnContext
                    + " mReason=" + mReason
                    + " mOnCompletedMsg=" + msgToString(mOnCompletedMsg) + "}";
        }
    }

    private ApnSetting mApnSetting;
    private ConnectionParams mConnectionParams;
    private DisconnectParams mDisconnectParams;
    private DcFailCause mDcFailCause;

    private PhoneBase mPhone;
    private LinkProperties mLinkProperties = new LinkProperties();
    private LinkCapabilities mLinkCapabilities = new LinkCapabilities();
    private long mCreateTime;
    private long mLastFailTime;
    private DcFailCause mLastFailCause;
    private static final String NULL_IP = "0.0.0.0";
    private Object mUserData;

    //***** Package visible variables
    int mTag;
    int mCid;
    List<ApnContext> mApnContexts = null;
    PendingIntent mReconnectIntent = null;
    RetryManager mRetryManager = new RetryManager();


    // ***** Event codes for driving the state machine, package visible for Dcc
    static final int BASE = Protocol.BASE_DATA_CONNECTION;
    static final int EVENT_CONNECT = BASE + 0;
    static final int EVENT_SETUP_DATA_CONNECTION_DONE = BASE + 1;
    static final int EVENT_GET_LAST_FAIL_DONE = BASE + 2;
    static final int EVENT_DEACTIVATE_DONE = BASE + 3;
    static final int EVENT_DISCONNECT = BASE + 4;
    static final int EVENT_RIL_CONNECTED = BASE + 5;
    static final int EVENT_DISCONNECT_ALL = BASE + 6;
    static final int EVENT_DATA_STATE_CHANGED = BASE + 7;
    static final int EVENT_TEAR_DOWN_NOW = BASE + 8;
    static final int EVENT_LOST_CONNECTION = BASE + 9;
    static final int EVENT_RETRY_CONNECTION = BASE + 10;

    private static final int CMD_TO_STRING_COUNT = EVENT_RETRY_CONNECTION - BASE + 1;
    private static String[] sCmdToString = new String[CMD_TO_STRING_COUNT];
    static {
        sCmdToString[EVENT_CONNECT - BASE] = "EVENT_CONNECT";
        sCmdToString[EVENT_SETUP_DATA_CONNECTION_DONE - BASE] =
                "EVENT_SETUP_DATA_CONNECTION_DONE";
        sCmdToString[EVENT_GET_LAST_FAIL_DONE - BASE] = "EVENT_GET_LAST_FAIL_DONE";
        sCmdToString[EVENT_DEACTIVATE_DONE - BASE] = "EVENT_DEACTIVATE_DONE";
        sCmdToString[EVENT_DISCONNECT - BASE] = "EVENT_DISCONNECT";
        sCmdToString[EVENT_RIL_CONNECTED - BASE] = "EVENT_RIL_CONNECTED";
        sCmdToString[EVENT_DISCONNECT_ALL - BASE] = "EVENT_DISCONNECT_ALL";
        sCmdToString[EVENT_DATA_STATE_CHANGED - BASE] = "EVENT_DATA_STATE_CHANGED";
        sCmdToString[EVENT_TEAR_DOWN_NOW - BASE] = "EVENT_TEAR_DOWN_NOW";
        sCmdToString[EVENT_LOST_CONNECTION - BASE] = "EVENT_LOST_CONNECTION";
        sCmdToString[EVENT_RETRY_CONNECTION - BASE] = "EVENT_RETRY_CONNECTION";
    }
    // Convert cmd to string or null if unknown
    static String cmdToString(int cmd) {
        String value;
        cmd -= BASE;
        if ((cmd >= 0) && (cmd < sCmdToString.length)) {
            value = sCmdToString[cmd];
        } else {
            value = DataConnectionAc.cmdToString(cmd + BASE);
        }
        if (value == null) {
            value = "0x" + Integer.toHexString(cmd + BASE);
        }
        return value;
    }

    /**
     * Create the connection object
     *
     * @param phone the Phone
     * @param id the connection id
     * @return DataConnection that was created.
     */
    static DataConnection makeDataConnection(PhoneBase phone, int id,
            DataConnectionTrackerBase dct, DcTesterFailBringUpAll failBringUpAll,
            DcController dcc) {
        DataConnection dc = new DataConnection(phone,
                "DC-" + mInstanceNumber.incrementAndGet(), id, dct, failBringUpAll, dcc);
        dc.start();
        if (DBG) dc.log("Made " + dc.getName());
        return dc;
    }

    void dispose() {
        log("dispose: call quiteNow()");
        quitNow();
    }

    /* Getter functions */

    LinkCapabilities getCopyLinkCapabilities() {
        return new LinkCapabilities(mLinkCapabilities);
    }

    LinkProperties getCopyLinkProperties() {
        return new LinkProperties(mLinkProperties);
    }

    boolean getIsInactive() {
        return getCurrentState() == mInactiveState;
    }

    int getCid() {
        return mCid;
    }

    ApnSetting getApnSetting() {
        return mApnSetting;
    }

    void setLinkPropertiesHttpProxy(ProxyProperties proxy) {
        mLinkProperties.setHttpProxy(proxy);
    }

    static class UpdateLinkPropertyResult {
        public DataCallResponse.SetupResult setupResult = DataCallResponse.SetupResult.SUCCESS;
        public LinkProperties oldLp;
        public LinkProperties newLp;
        public UpdateLinkPropertyResult(LinkProperties curLp) {
            oldLp = curLp;
            newLp = curLp;
        }
    }

    UpdateLinkPropertyResult updateLinkProperty(DataCallResponse newState) {
        UpdateLinkPropertyResult result = new UpdateLinkPropertyResult(mLinkProperties);

        if (newState == null) return result;

        DataCallResponse.SetupResult setupResult;
        result.newLp = new LinkProperties();

        // set link properties based on data call response
        result.setupResult = setLinkProperties(newState, result.newLp);
        if (result.setupResult != DataCallResponse.SetupResult.SUCCESS) {
            if (DBG) log("updateLinkProperty failed : " + result.setupResult);
            return result;
        }
        // copy HTTP proxy as it is not part DataCallResponse.
        result.newLp.setHttpProxy(mLinkProperties.getHttpProxy());

        if (DBG && (! result.oldLp.equals(result.newLp))) {
            log("updateLinkProperty old LP=" + result.oldLp);
            log("updateLinkProperty new LP=" + result.newLp);
        }
        mLinkProperties = result.newLp;

        return result;
    }

    //***** Constructor (NOTE: uses dcc.getHandler() as its Handler)
    private DataConnection(PhoneBase phone, String name, int id,
                DataConnectionTrackerBase dct, DcTesterFailBringUpAll failBringUpAll,
                DcController dcc) {
        super(name, dcc.getHandler());
        setLogRecSize(300);
        setLogOnlyTransitions(true);
        if (DBG) log("DataConnection constructor E");

        mPhone = phone;
        mDct = dct;
        mDcTesterFailBringUpAll = failBringUpAll;
        mDcController = dcc;
        mId = id;
        mCid = -1;
        mDcRetryAlarmController = new DcRetryAlarmController(mPhone, this);

        addState(mDefaultState);
            addState(mInactiveState, mDefaultState);
            addState(mActivatingState, mDefaultState);
            addState(mRetryingState, mDefaultState);
            addState(mActiveState, mDefaultState);
            addState(mDisconnectingState, mDefaultState);
            addState(mDisconnectingErrorCreatingConnection, mDefaultState);
        setInitialState(mInactiveState);

        mApnContexts = new ArrayList<ApnContext>();
        if (DBG) log("DataConnection constructor X");
    }

    private String getRetryConfig(boolean forDefault) {
        int nt = mPhone.getServiceState().getNetworkType();

        if (DEBUGGABLE) {
            String config = SystemProperties.get("test.data_retry_config");
            if (! TextUtils.isEmpty(config)) {
                return config;
            }
        }

        if ((nt == TelephonyManager.NETWORK_TYPE_CDMA) ||
            (nt == TelephonyManager.NETWORK_TYPE_1xRTT) ||
            (nt == TelephonyManager.NETWORK_TYPE_EVDO_0) ||
            (nt == TelephonyManager.NETWORK_TYPE_EVDO_A) ||
            (nt == TelephonyManager.NETWORK_TYPE_EVDO_B) ||
            (nt == TelephonyManager.NETWORK_TYPE_EHRPD)) {
            // CDMA variant
            return SystemProperties.get("ro.cdma.data_retry_config");
        } else {
            // Use GSM variant for all others.
            if (forDefault) {
                return SystemProperties.get("ro.gsm.data_retry_config");
            } else {
                return SystemProperties.get("ro.gsm.2nd_data_retry_config");
            }
        }
    }

    private void configureRetry(boolean forDefault) {
        String retryConfig = getRetryConfig(forDefault);

        if (!mRetryManager.configure(retryConfig)) {
            if (forDefault) {
                if (!mRetryManager.configure(DEFAULT_DATA_RETRY_CONFIG)) {
                    // Should never happen, log an error and default to a simple linear sequence.
                    loge("configureRetry: Could not configure using " +
                            "DEFAULT_DATA_RETRY_CONFIG=" + DEFAULT_DATA_RETRY_CONFIG);
                    mRetryManager.configure(5, 2000, 1000);
                }
            } else {
                if (!mRetryManager.configure(SECONDARY_DATA_RETRY_CONFIG)) {
                    // Should never happen, log an error and default to a simple sequence.
                    loge("configureRetry: Could note configure using " +
                            "SECONDARY_DATA_RETRY_CONFIG=" + SECONDARY_DATA_RETRY_CONFIG);
                    mRetryManager.configure(5, 2000, 1000);
                }
            }
        }
        if (DBG) {
            log("configureRetry: forDefault=" + forDefault + " mRetryManager=" + mRetryManager);
        }
    }

    /**
     * Begin setting up a data connection, calls setupDataCall
     * and the ConnectionParams will be returned with the
     * EVENT_SETUP_DATA_CONNECTION_DONE AsyncResul.userObj.
     *
     * @param cp is the connection parameters
     */
    private void onConnect(ConnectionParams cp) {
        if (DBG) log("onConnect: carrier='" + mApnSetting.carrier
                + "' APN='" + mApnSetting.apn
                + "' proxy='" + mApnSetting.proxy + "' port='" + mApnSetting.port + "'");

        // Check if we should fake an error.
        if (mDcTesterFailBringUpAll.getDcFailBringUp().mCounter  > 0) {
            DataCallResponse response = new DataCallResponse();
            response.version = mPhone.mCi.getRilVersion();
            response.status = mDcTesterFailBringUpAll.getDcFailBringUp().mFailCause.getErrorCode();
            response.cid = 0;
            response.active = 0;
            response.type = "";
            response.ifname = "";
            response.addresses = new String[0];
            response.dnses = new String[0];
            response.gateways = new String[0];
            response.suggestedRetryTime =
                    mDcTesterFailBringUpAll.getDcFailBringUp().mSuggestedRetryTime;

            Message msg = obtainMessage(EVENT_SETUP_DATA_CONNECTION_DONE, cp);
            AsyncResult.forMessage(msg, response, null);
            sendMessage(msg);
            if (DBG) {
                log("onConnect: FailBringUpAll=" + mDcTesterFailBringUpAll.getDcFailBringUp()
                        + " send error response=" + response);
            }
            mDcTesterFailBringUpAll.getDcFailBringUp().mCounter -= 1;
            return;
        }

        mCreateTime = -1;
        mLastFailTime = -1;
        mLastFailCause = DcFailCause.NONE;

        // msg.obj will be returned in AsyncResult.userObj;
        Message msg = obtainMessage(EVENT_SETUP_DATA_CONNECTION_DONE, cp);
        msg.obj = cp;

        int authType = mApnSetting.authType;
        if (authType == -1) {
            authType = TextUtils.isEmpty(mApnSetting.user) ? RILConstants.SETUP_DATA_AUTH_NONE
                    : RILConstants.SETUP_DATA_AUTH_PAP_CHAP;
        }

        String protocol;
        if (mPhone.getServiceState().getRoaming()) {
            protocol = mApnSetting.roamingProtocol;
        } else {
            protocol = mApnSetting.protocol;
        }

        mPhone.mCi.setupDataCall(
                Integer.toString(getRilRadioTechnology()),
                Integer.toString(cp.mProfileId),
                mApnSetting.apn, mApnSetting.user, mApnSetting.password,
                Integer.toString(authType),
                protocol, msg);
    }

    /**
     * TearDown the data connection when the deactivation is complete a Message with
     * msg.what == EVENT_DEACTIVATE_DONE and msg.obj == AsyncResult with AsyncResult.obj
     * containing the parameter o.
     *
     * @param o is the object returned in the AsyncResult.obj.
     */
    private void tearDownData(Object o) {
        int discReason = RILConstants.DEACTIVATE_REASON_NONE;
        if ((o != null) && (o instanceof DisconnectParams)) {
            DisconnectParams dp = (DisconnectParams)o;

            if (TextUtils.equals(dp.mReason, Phone.REASON_RADIO_TURNED_OFF)) {
                discReason = RILConstants.DEACTIVATE_REASON_RADIO_OFF;
            } else if (TextUtils.equals(dp.mReason, Phone.REASON_PDP_RESET)) {
                discReason = RILConstants.DEACTIVATE_REASON_PDP_RESET;
            }
        }
        if (mPhone.mCi.getRadioState().isOn()) {
            if (DBG) log("tearDownData radio is on, call deactivateDataCall");
            mPhone.mCi.deactivateDataCall(mCid, discReason,
                    obtainMessage(EVENT_DEACTIVATE_DONE, mTag, 0, o));
        } else {
            if (DBG) log("tearDownData radio is off sendMessage EVENT_DEACTIVATE_DONE immediately");
            AsyncResult ar = new AsyncResult(o, null, null);
            sendMessage(obtainMessage(EVENT_DEACTIVATE_DONE, mTag, 0, ar));
        }
    }

    private void notifyAllWithEvent(ApnContext alreadySent, int event, String reason) {
        for (ApnContext apnContext : mApnContexts) {
            if (apnContext == alreadySent) continue;
            if (reason != null) apnContext.setReason(reason);
            Message msg = mDct.obtainMessage(event, apnContext);
            AsyncResult.forMessage(msg);
            msg.sendToTarget();
        }
    }

    private void notifyAllOfConnected(String reason) {
        notifyAllWithEvent(null, DctConstants.EVENT_DATA_SETUP_COMPLETE, reason);
    }

    private void notifyAllOfDisconnectDcRetrying(String reason) {
        notifyAllWithEvent(null, DctConstants.EVENT_DISCONNECT_DC_RETRYING, reason);
    }
    private void notifyAllDisconnectCompleted(DcFailCause cause) {
        notifyAllWithEvent(null, DctConstants.EVENT_DISCONNECT_DONE, cause.toString());
    }


    /**
     * Send the connectionCompletedMsg.
     *
     * @param cp is the ConnectionParams
     * @param cause and if no error the cause is DcFailCause.NONE
     * @param sendAll is true if all contexts are to be notified
     */
    private void notifyConnectCompleted(ConnectionParams cp, DcFailCause cause, boolean sendAll) {
        ApnContext alreadySent = null;

        if (cp != null && cp.mOnCompletedMsg != null) {
            // Get the completed message but only use it once
            Message connectionCompletedMsg = cp.mOnCompletedMsg;
            cp.mOnCompletedMsg = null;
            if (connectionCompletedMsg.obj instanceof ApnContext) {
                alreadySent = (ApnContext)connectionCompletedMsg.obj;
            }

            long timeStamp = System.currentTimeMillis();
            connectionCompletedMsg.arg1 = mCid;

            if (cause == DcFailCause.NONE) {
                mCreateTime = timeStamp;
                AsyncResult.forMessage(connectionCompletedMsg);
            } else {
                mLastFailCause = cause;
                mLastFailTime = timeStamp;

                // Return message with a Throwable exception to signify an error.
                if (cause == null) cause = DcFailCause.UNKNOWN;
                AsyncResult.forMessage(connectionCompletedMsg, cause,
                        new Throwable(cause.toString()));
            }
            if (DBG) {
                log("notifyConnectCompleted at " + timeStamp + " cause=" + cause
                        + " connectionCompletedMsg=" + msgToString(connectionCompletedMsg));
            }

            connectionCompletedMsg.sendToTarget();
        }
        if (sendAll) {
            notifyAllWithEvent(alreadySent, DctConstants.EVENT_DATA_SETUP_COMPLETE_ERROR,
                    cause.toString());
        }
    }

    /**
     * Send ar.userObj if its a message, which is should be back to originator.
     *
     * @param dp is the DisconnectParams.
     */
    private void notifyDisconnectCompleted(DisconnectParams dp, boolean sendAll) {
        if (VDBG) log("NotifyDisconnectCompleted");

        ApnContext alreadySent = null;
        String reason = null;

        if (dp != null && dp.mOnCompletedMsg != null) {
            // Get the completed message but only use it once
            Message msg = dp.mOnCompletedMsg;
            dp.mOnCompletedMsg = null;
            if (msg.obj instanceof ApnContext) {
                alreadySent = (ApnContext)msg.obj;
            }
            reason = dp.mReason;
            if (VDBG) {
                log(String.format("msg=%s msg.obj=%s", msg.toString(),
                    ((msg.obj instanceof String) ? (String) msg.obj : "<no-reason>")));
            }
            AsyncResult.forMessage(msg);
            msg.sendToTarget();
        }
        if (sendAll) {
            if (reason == null) {
                reason = DcFailCause.UNKNOWN.toString();
            }
            notifyAllWithEvent(alreadySent, DctConstants.EVENT_DISCONNECT_DONE, reason);
        }
        if (DBG) log("NotifyDisconnectCompleted DisconnectParams=" + dp);
    }

    private int getRilRadioTechnology() {
        int rilRadioTechnology;
        if (mApnSetting.bearer > 0) {
            rilRadioTechnology = mApnSetting.bearer + 2;
        } else {
            rilRadioTechnology = mPhone.getServiceState().getRilDataRadioTechnology() + 2;
        }
        return rilRadioTechnology;
    }

    /*
     * **************************************************************************
     * Begin Members and methods owned by DataConnectionTracker but stored
     * in a DataConnection because there is one per connection.
     * **************************************************************************
     */

    /*
     * The id is owned by DataConnectionTracker.
     */
    private int mId;

    /**
     * Get the DataConnection ID
     */
    public int getDataConnectionId() {
        return mId;
    }

    /*
     * **************************************************************************
     * End members owned by DataConnectionTracker
     * **************************************************************************
     */

    /**
     * Clear all settings called when entering mInactiveState.
     */
    private void clearSettings() {
        if (DBG) log("clearSettings");

        mCreateTime = -1;
        mLastFailTime = -1;
        mLastFailCause = DcFailCause.NONE;
        mCid = -1;

        mLinkProperties = new LinkProperties();
        mApnContexts.clear();
        mApnSetting = null;
        mDcFailCause = null;
    }

    /**
     * Process setup completion.
     *
     * @param ar is the result
     * @return SetupResult.
     */
    private DataCallResponse.SetupResult onSetupConnectionCompleted(AsyncResult ar) {
        DataCallResponse response = (DataCallResponse) ar.result;
        ConnectionParams cp = (ConnectionParams) ar.userObj;
        DataCallResponse.SetupResult result;

        if (cp.mTag != mTag) {
            if (DBG) {
                log("onSetupConnectionCompleted stale cp.tag=" + cp.mTag + ", mtag=" + mTag);
            }
            result = DataCallResponse.SetupResult.ERR_Stale;
        } else if (ar.exception != null) {
            if (DBG) {
                log("onSetupConnectionCompleted failed, ar.exception=" + ar.exception +
                    " response=" + response);
            }

            if (ar.exception instanceof CommandException
                    && ((CommandException) (ar.exception)).getCommandError()
                    == CommandException.Error.RADIO_NOT_AVAILABLE) {
                result = DataCallResponse.SetupResult.ERR_BadCommand;
                result.mFailCause = DcFailCause.RADIO_NOT_AVAILABLE;
            } else if ((response == null) || (response.version < 4)) {
                result = DataCallResponse.SetupResult.ERR_GetLastErrorFromRil;
            } else {
                result = DataCallResponse.SetupResult.ERR_RilError;
                result.mFailCause = DcFailCause.fromInt(response.status);
            }
        } else if (response.status != 0) {
            result = DataCallResponse.SetupResult.ERR_RilError;
            result.mFailCause = DcFailCause.fromInt(response.status);
        } else {
            if (DBG) log("onSetupConnectionCompleted received DataCallResponse: " + response);
            mCid = response.cid;
            result = updateLinkProperty(response).setupResult;
        }

        return result;
    }

    private boolean isDnsOk(String[] domainNameServers) {
        if (NULL_IP.equals(domainNameServers[0]) && NULL_IP.equals(domainNameServers[1])
                && !mPhone.isDnsCheckDisabled()) {
            // Work around a race condition where QMI does not fill in DNS:
            // Deactivate PDP and let DataConnectionTracker retry.
            // Do not apply the race condition workaround for MMS APN
            // if Proxy is an IP-address.
            // Otherwise, the default APN will not be restored anymore.
            if (!mApnSetting.types[0].equals(PhoneConstants.APN_TYPE_MMS)
                || !isIpAddress(mApnSetting.mmsProxy)) {
                log(String.format(
                        "isDnsOk: return false apn.types[0]=%s APN_TYPE_MMS=%s isIpAddress(%s)=%s",
                        mApnSetting.types[0], PhoneConstants.APN_TYPE_MMS, mApnSetting.mmsProxy,
                        isIpAddress(mApnSetting.mmsProxy)));
                return false;
            }
        }
        return true;
    }

    private boolean isIpAddress(String address) {
        if (address == null) return false;

        return Patterns.IP_ADDRESS.matcher(address).matches();
    }

    private DataCallResponse.SetupResult setLinkProperties(DataCallResponse response,
            LinkProperties lp) {
        // Check if system property dns usable
        boolean okToUseSystemPropertyDns = false;
        String propertyPrefix = "net." + response.ifname + ".";
        String dnsServers[] = new String[2];
        dnsServers[0] = SystemProperties.get(propertyPrefix + "dns1");
        dnsServers[1] = SystemProperties.get(propertyPrefix + "dns2");
        okToUseSystemPropertyDns = isDnsOk(dnsServers);

        // set link properties based on data call response
        return response.setLinkProperties(lp, okToUseSystemPropertyDns);
    }

    /**
     * The parent state for all other states.
     */
    private class DcDefaultState extends State {
        @Override
        public void enter() {
            if (DBG) log("DcDefaultState: enter");

            // Add ourselves to the list of data connections
            mDcController.addDc(DataConnection.this);
        }
        @Override
        public void exit() {
            if (DBG) log("DcDefaultState: exit");


            if (mAc != null) {
                mAc.disconnected();
                mAc = null;
            }
            mDcRetryAlarmController.dispose();
            mDcRetryAlarmController = null;
            mApnContexts = null;
            mReconnectIntent = null;
            mDct = null;
            mApnSetting = null;
            mPhone = null;
            mLinkProperties = null;
            mLinkCapabilities = null;
            mLastFailCause = null;
            mUserData = null;

            // Remove ourselves from the DC lists
            mDcController.removeDc(DataConnection.this);

            mDcController = null;
            mDcTesterFailBringUpAll = null;
        }

        @Override
        public boolean processMessage(Message msg) {
            boolean retVal = HANDLED;
            AsyncResult ar;

            if (VDBG) {
                log("DcDefault msg=" + getWhatToString(msg.what)
                        + " RefCount=" + mApnContexts.size());
            }
            switch (msg.what) {
                case AsyncChannel.CMD_CHANNEL_FULL_CONNECTION: {
                    if (mAc != null) {
                        if (VDBG) log("Disconnecting to previous connection mAc=" + mAc);
                        mAc.replyToMessage(msg, AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED,
                                AsyncChannel.STATUS_FULL_CONNECTION_REFUSED_ALREADY_CONNECTED);
                    } else {
                        mAc = new AsyncChannel();
                        mAc.connected(null, getHandler(), msg.replyTo);
                        if (VDBG) log("DcDefaultState: FULL_CONNECTION reply connected");
                        mAc.replyToMessage(msg, AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED,
                                AsyncChannel.STATUS_SUCCESSFUL, mId, "hi");
                    }
                    break;
                }
                case AsyncChannel.CMD_CHANNEL_DISCONNECTED: {
                    if (VDBG) log("CMD_CHANNEL_DISCONNECTED");
                    quit();
                    break;
                }
                case DataConnectionAc.REQ_IS_INACTIVE: {
                    boolean val = getIsInactive();
                    if (VDBG) log("REQ_IS_INACTIVE  isInactive=" + val);
                    mAc.replyToMessage(msg, DataConnectionAc.RSP_IS_INACTIVE, val ? 1 : 0);
                    break;
                }
                case DataConnectionAc.REQ_GET_CID: {
                    int cid = getCid();
                    if (VDBG) log("REQ_GET_CID  cid=" + cid);
                    mAc.replyToMessage(msg, DataConnectionAc.RSP_GET_CID, cid);
                    break;
                }
                case DataConnectionAc.REQ_GET_APNSETTING: {
                    ApnSetting apnSetting = getApnSetting();
                    if (VDBG) log("REQ_GET_APNSETTING  mApnSetting=" + apnSetting);
                    mAc.replyToMessage(msg, DataConnectionAc.RSP_GET_APNSETTING, apnSetting);
                    break;
                }
                case DataConnectionAc.REQ_GET_LINK_PROPERTIES: {
                    LinkProperties lp = getCopyLinkProperties();
                    if (VDBG) log("REQ_GET_LINK_PROPERTIES linkProperties" + lp);
                    mAc.replyToMessage(msg, DataConnectionAc.RSP_GET_LINK_PROPERTIES, lp);
                    break;
                }
                case DataConnectionAc.REQ_SET_LINK_PROPERTIES_HTTP_PROXY: {
                    ProxyProperties proxy = (ProxyProperties) msg.obj;
                    if (VDBG) log("REQ_SET_LINK_PROPERTIES_HTTP_PROXY proxy=" + proxy);
                    setLinkPropertiesHttpProxy(proxy);
                    mAc.replyToMessage(msg, DataConnectionAc.RSP_SET_LINK_PROPERTIES_HTTP_PROXY);
                    break;
                }
                case DataConnectionAc.REQ_GET_LINK_CAPABILITIES: {
                    LinkCapabilities lc = getCopyLinkCapabilities();
                    if (VDBG) log("REQ_GET_LINK_CAPABILITIES linkCapabilities" + lc);
                    mAc.replyToMessage(msg, DataConnectionAc.RSP_GET_LINK_CAPABILITIES, lc);
                    break;
                }
                case DataConnectionAc.REQ_RESET:
                    if (VDBG) log("DcDefaultState: msg.what=REQ_RESET");
                    transitionTo(mInactiveState);
                    break;
                case EVENT_CONNECT:
                    if (DBG) log("DcDefaultState: msg.what=EVENT_CONNECT, fail not expected");
                    ConnectionParams cp = (ConnectionParams) msg.obj;
                    notifyConnectCompleted(cp, DcFailCause.UNKNOWN, false);
                    break;

                case EVENT_DISCONNECT:
                    if (DBG) {
                        log("DcDefaultState deferring msg.what=EVENT_DISCONNECT RefCount="
                                + mApnContexts.size());
                    }
                    deferMessage(msg);
                    break;

                case EVENT_DISCONNECT_ALL:
                    if (DBG) {
                        log("DcDefaultState deferring msg.what=EVENT_DISCONNECT_ALL RefCount="
                                + mApnContexts.size());
                    }
                    deferMessage(msg);
                    break;

                case EVENT_TEAR_DOWN_NOW:
                    if (DBG) log("DcDefaultState EVENT_TEAR_DOWN_NOW");
                    mPhone.mCi.deactivateDataCall(mCid, 0,  null);
                    break;

                case EVENT_LOST_CONNECTION:
                    if (DBG) {
                        String s = "DcDefaultState ignore EVENT_LOST_CONNECTION"
                            + " tag=" + msg.arg1 + ":mTag=" + mTag;
                        logAndAddLogRec(s);
                    }
                    break;

                case EVENT_RETRY_CONNECTION:
                    if (DBG) {
                        String s = "DcDefaultState ignore EVENT_RETRY_CONNECTION"
                                + " tag=" + msg.arg1 + ":mTag=" + mTag;
                        logAndAddLogRec(s);
                    }
                    break;

                default:
                    if (DBG) {
                        log("DcDefaultState: shouldn't happen but ignore msg.what="
                                + getWhatToString(msg.what));
                    }
                    break;
            }

            return retVal;
        }
    }
    private DcDefaultState mDefaultState = new DcDefaultState();

    /**
     * The state machine is inactive and expects a EVENT_CONNECT.
     */
    private class DcInactiveState extends State {
        // Inform all contexts we've failed connecting
        public void setEnterNotificationParams(ConnectionParams cp, DcFailCause cause) {
            if (VDBG) log("DcInactiveState: setEnterNoticationParams cp,cause");
            mConnectionParams = cp;
            mDisconnectParams = null;
            mDcFailCause = cause;
        }

        // Inform all contexts we've failed disconnected
        public void setEnterNotificationParams(DisconnectParams dp) {
            if (VDBG) log("DcInactiveState: setEnterNoticationParams dp");
            mConnectionParams = null;
            mDisconnectParams = dp;
            mDcFailCause = DcFailCause.NONE;
        }

        // Inform all contexts of the failure cause
        public void setEnterNotificationParams(DcFailCause cause) {
            mConnectionParams = null;
            mDisconnectParams = null;
            mDcFailCause = cause;
        }

        // We won't be informing anyone
        public void setEnterNotificationParams() {
            mConnectionParams = null;
            mDisconnectParams = null;
            mDcFailCause = null;
        }

        @Override
        public void enter() {
            mTag += 1;
            if (DBG) log("DcInactiveState: enter() mTag=" + mTag);

            if (mConnectionParams != null) {
                if (DBG) {
                    log("DcInactiveState: enter notifyConnectCompleted +ALL failCause="
                            + mDcFailCause);
                }
                notifyConnectCompleted(mConnectionParams, mDcFailCause, true);
            }
            if (mDisconnectParams != null) {
                if (DBG) {
                    log("DcInactiveState: enter notifyDisconnectCompleted +ALL failCause="
                            + mDcFailCause);
                }
                notifyDisconnectCompleted(mDisconnectParams, true);
            }
            if (mDisconnectParams == null && mConnectionParams == null && mDcFailCause != null) {
                if (DBG) {
                    log("DcInactiveState: enter notifyAllDisconnectCompleted failCause="
                            + mDcFailCause);
                }
                notifyAllDisconnectCompleted(mDcFailCause);
            }

            // Remove ourselves from cid mapping, before clearSettings
            mDcController.removeActiveDcByCid(DataConnection.this);

            clearSettings();
        }

        @Override
        public void exit() {
        }

        @Override
        public boolean processMessage(Message msg) {
            boolean retVal;

            switch (msg.what) {
                case DataConnectionAc.REQ_RESET:
                    if (DBG) {
                        log("DcInactiveState: msg.what=RSP_RESET, ignore we're already reset");
                    }
                    retVal = HANDLED;
                    break;

                case EVENT_CONNECT:
                    mConnectionParams = (ConnectionParams) msg.obj;
                    mConnectionParams.mTag = mTag;

                    ApnContext apnContext = mConnectionParams.mApnContext;
                    mApnSetting = apnContext.getApnSetting();
                    mApnContexts.add(apnContext);
                    configureRetry(mApnSetting.canHandleType(PhoneConstants.APN_TYPE_DEFAULT));
                    mRetryManager.setRetryCount(0);
                    mRetryManager.setCurMaxRetryCount(mConnectionParams.mInitialMaxRetry);

                    if (DBG) {
                        log("DcInactiveState msg.what=EVENT_CONNECT"
                                + " RefCount=" + mApnContexts.size()
                                + " mApnList=" + mApnContexts
                                + " mConnectionParams=" + mConnectionParams);
                    }

                    onConnect(mConnectionParams);
                    transitionTo(mActivatingState);
                    retVal = HANDLED;
                    break;

                case EVENT_DISCONNECT:
                    if (DBG) log("DcInactiveState: msg.what=EVENT_DISCONNECT");
                    notifyDisconnectCompleted((DisconnectParams)msg.obj, false);
                    retVal = HANDLED;
                    break;

                case EVENT_DISCONNECT_ALL:
                    if (DBG) log("DcInactiveState: msg.what=EVENT_DISCONNECT_ALL");
                    notifyDisconnectCompleted((DisconnectParams)msg.obj, false);
                    retVal = HANDLED;
                    break;

                default:
                    if (VDBG) {
                        log("DcInactiveState nothandled msg.what=" + getWhatToString(msg.what));
                    }
                    retVal = NOT_HANDLED;
                    break;
            }
            return retVal;
        }
    }
    private DcInactiveState mInactiveState = new DcInactiveState();

    /**
     * The state machine is retrying and expects a EVENT_RETRY_CONNECTION.
     */
    private class DcRetryingState extends State {
        @Override
        public void enter() {
            if (DBG) {
                log("DcRetryingState: enter() mTag=" + mTag
                    + ", call notifyAllOfDisconnectDcRetrying lostConnection");
            }

            notifyAllOfDisconnectDcRetrying(Phone.REASON_LOST_DATA_CONNECTION);

            // Remove ourselves from cid mapping
            mDcController.removeActiveDcByCid(DataConnection.this);
            mCid = -1;
        }

        @Override
        public boolean processMessage(Message msg) {
            boolean retVal;

            switch (msg.what) {
                case EVENT_RETRY_CONNECTION: {
                    if (msg.arg1 == mTag) {
                        mRetryManager.increaseRetryCount();
                        if (DBG) {
                            log("DcRetryingState EVENT_RETRY_CONNECTION"
                                    + " RetryCount=" +  mRetryManager.getRetryCount()
                                    + " mConnectionParams=" + mConnectionParams);
                        }
                        onConnect(mConnectionParams);
                        transitionTo(mActivatingState);
                    } else {
                        if (DBG) {
                            log("DcRetryingState stale EVENT_RETRY_CONNECTION"
                                    + " tag:" + msg.arg1 + " != mTag:" + mTag);
                        }
                    }
                    retVal = HANDLED;
                    break;
                }
                case DataConnectionAc.REQ_RESET: {
                    if (DBG) {
                        log("DcRetryingState: msg.what=RSP_RESET, ignore we're already reset");
                    }
                    mInactiveState.setEnterNotificationParams(mConnectionParams,
                            DcFailCause.RESET_BY_FRAMEWORK);
                    transitionTo(mInactiveState);
                    retVal = HANDLED;
                    break;
                }
                case EVENT_CONNECT: {
                    if (DBG) {
                        ConnectionParams cp = (ConnectionParams) msg.obj;
                        log("DcRetryingState msg.what=EVENT_CONNECT "
                                + "RefCount=" + mApnContexts.size() + " cp=" + cp
                                + " mConnectionParams=" + mConnectionParams);
                    }
                    // Enter inactive state and skip notification as
                    // it will be assumed this EVENT_CONNECT failed.
                    mInactiveState.setEnterNotificationParams();
                    deferMessage(msg);
                    transitionTo(mInactiveState);
                    retVal = HANDLED;
                    break;
                }
                case EVENT_DISCONNECT: {
                    DisconnectParams dp = (DisconnectParams) msg.obj;

                    if (mApnContexts.remove(dp.mApnContext) && mApnContexts.size() == 0) {
                        if (DBG) {
                            log("DcRetryingState msg.what=EVENT_DISCONNECT " + " RefCount="
                                    + mApnContexts.size() + " dp=" + dp);
                        }
                        mInactiveState.setEnterNotificationParams(dp);
                        transitionTo(mInactiveState);
                    } else {
                        if (DBG) log("DcInactiveState: msg.what=EVENT_DISCONNECT");
                        notifyDisconnectCompleted(dp, false);
                    }
                    retVal = HANDLED;
                    break;
                }
                case EVENT_DISCONNECT_ALL: {
                    if (DBG) {
                        log("DcRetryingState msg.what=EVENT_DISCONNECT/DISCONNECT_ALL "
                                + "RefCount=" + mApnContexts.size());
                    }
                    mInactiveState.setEnterNotificationParams(DcFailCause.LOST_CONNECTION);
                    deferMessage(msg);
                    transitionTo(mInactiveState);
                    retVal = HANDLED;
                    break;
                }
                default: {
                    if (VDBG) {
                        log("DcRetryingState nothandled msg.what=" + getWhatToString(msg.what));
                    }
                    retVal = NOT_HANDLED;
                    break;
                }
            }
            return retVal;
        }
    }
    private DcRetryingState mRetryingState = new DcRetryingState();

    /**
     * The state machine is activating a connection.
     */
    private class DcActivatingState extends State {
        @Override
        public boolean processMessage(Message msg) {
            boolean retVal;
            AsyncResult ar;
            ConnectionParams cp;

            if (DBG) log("DcActivatingState: msg=" + msgToString(msg));
            switch (msg.what) {
                case EVENT_CONNECT:
                    deferMessage(msg);
                    retVal = HANDLED;
                    break;

                case EVENT_SETUP_DATA_CONNECTION_DONE:
                    ar = (AsyncResult) msg.obj;
                    cp = (ConnectionParams) ar.userObj;

                    DataCallResponse.SetupResult result = onSetupConnectionCompleted(ar);
                    if (result != DataCallResponse.SetupResult.ERR_Stale) {
                        if (mConnectionParams != cp) {
                            loge("DcActivatingState: WEIRD mConnectionsParams:"+ mConnectionParams
                                    + " != cp:" + cp);
                        }
                    }
                    if (DBG) log("DcActivatingState onSetupConnectionCompleted result=" + result);
                    switch (result) {
                        case SUCCESS:
                            // All is well
                            mDcFailCause = DcFailCause.NONE;
                            transitionTo(mActiveState);
                            break;
                        case ERR_BadCommand:
                            // Vendor ril rejected the command and didn't connect.
                            // Transition to inactive but send notifications after
                            // we've entered the mInactive state.
                            mInactiveState.setEnterNotificationParams(cp, result.mFailCause);
                            transitionTo(mInactiveState);
                            break;
                        case ERR_UnacceptableParameter:
                            // The addresses given from the RIL are bad
                            tearDownData(cp);
                            transitionTo(mDisconnectingErrorCreatingConnection);
                            break;
                        case ERR_GetLastErrorFromRil:
                            // Request failed and this is an old RIL
                            mPhone.mCi.getLastDataCallFailCause(
                                    obtainMessage(EVENT_GET_LAST_FAIL_DONE, cp));
                            break;
                        case ERR_RilError:
                            int delay = mDcRetryAlarmController.getSuggestedRetryTime(
                                                                    DataConnection.this, ar);
                            if (delay >= 0) {
                                mDcRetryAlarmController.startRetryAlarm(EVENT_RETRY_CONNECTION,
                                                            mTag, delay);
                                transitionTo(mRetryingState);
                            } else {
                                mInactiveState.setEnterNotificationParams(cp, result.mFailCause);
                                transitionTo(mInactiveState);
                            }
                            break;
                        case ERR_Stale:
                            loge("DcActivatingState: stale EVENT_SETUP_DATA_CONNECTION_DONE"
                                    + " tag:" + cp.mTag + " != mTag:" + mTag);
                            break;
                        default:
                            throw new RuntimeException("Unknown SetupResult, should not happen");
                    }
                    retVal = HANDLED;
                    break;

                case EVENT_GET_LAST_FAIL_DONE:
                    ar = (AsyncResult) msg.obj;
                    cp = (ConnectionParams) ar.userObj;
                    if (cp.mTag == mTag) {
                        if (mConnectionParams != cp) {
                            loge("DcActivatingState: WEIRD mConnectionsParams:" + mConnectionParams
                                    + " != cp:" + cp);
                        }

                        DcFailCause cause = DcFailCause.UNKNOWN;

                        if (DBG) {
                            log("DcActivatingState msg.what=EVENT_GET_LAST_FAIL_DONE"
                                    + " RefCount=" + mApnContexts.size());
                        }
                        if (ar.exception == null) {
                            int rilFailCause = ((int[]) (ar.result))[0];
                            cause = DcFailCause.fromInt(rilFailCause);
                        }
                        mDcFailCause = cause;

                        int retryDelay = mRetryManager.getRetryTimer();
                        if (mRetryManager.isRetryNeeded()) {
                            mDcRetryAlarmController.startRetryAlarm(EVENT_RETRY_CONNECTION, mTag,
                                                            retryDelay);
                            transitionTo(mRetryingState);
                        } else {
                            // Transition to inactive but send notifications after
                            // we've entered the mInactive state.
                            mInactiveState.setEnterNotificationParams(cp, cause);
                            transitionTo(mInactiveState);
                        }
                    } else {
                        loge("DcActivatingState: stale EVENT_GET_LAST_FAIL_DONE"
                                + " tag:" + cp.mTag + " != mTag:" + mTag);
                    }

                    retVal = HANDLED;
                    break;

                default:
                    if (VDBG) {
                        log("DcActivatingState not handled msg.what=" +
                                getWhatToString(msg.what) + " RefCount=" + mApnContexts.size());
                    }
                    retVal = NOT_HANDLED;
                    break;
            }
            return retVal;
        }
    }
    private DcActivatingState mActivatingState = new DcActivatingState();

    /**
     * The state machine is connected, expecting an EVENT_DISCONNECT.
     */
    private class DcActiveState extends State {
        @Override public void enter() {
            if (DBG) log("DcActiveState: enter dc=" + DataConnection.this);

            if (mRetryManager.getRetryCount() != 0) {
                log("DcActiveState: connected after retrying call notifyAllOfConnected");
                mRetryManager.setRetryCount(0);
            }
            // If we were retrying there maybe more than one, otherwise they'll only be one.
            notifyAllOfConnected(Phone.REASON_CONNECTED);

            // If the EVENT_CONNECT set the current max retry restore it here
            // if it didn't then this is effectively a NOP.
            mRetryManager.restoreCurMaxRetryCount();
            mDcController.addActiveDcByCid(DataConnection.this);
        }

        @Override
        public void exit() {
            if (DBG) log("DcActiveState: exit dc=" + this);
        }

        @Override
        public boolean processMessage(Message msg) {
            boolean retVal;

            switch (msg.what) {
                case EVENT_CONNECT: {
                    ConnectionParams cp = (ConnectionParams) msg.obj;
                    if (mApnContexts.contains(cp.mApnContext)) {
                        log("DcActiveState ERROR already added apnContext=" + cp.mApnContext
                                    + " to this DC=" + this);
                    } else {
                        mApnContexts.add(cp.mApnContext);
                        if (DBG) {
                            log("DcActiveState msg.what=EVENT_CONNECT RefCount="
                                    + mApnContexts.size());
                        }
                    }
                    notifyConnectCompleted(cp, DcFailCause.NONE, false);
                    retVal = HANDLED;
                    break;
                }
                case EVENT_DISCONNECT: {
                    DisconnectParams dp = (DisconnectParams) msg.obj;
                    if (mApnContexts.contains(dp.mApnContext)) {
                        if (DBG) {
                            log("DcActiveState msg.what=EVENT_DISCONNECT RefCount="
                                    + mApnContexts.size());
                        }

                        if (mApnContexts.size() == 1) {
                            mApnContexts.clear();
                            mDisconnectParams = dp;
                            mConnectionParams = null;
                            dp.mTag = mTag;
                            tearDownData(dp);
                            transitionTo(mDisconnectingState);
                        } else {
                            mApnContexts.remove(dp.mApnContext);
                            notifyDisconnectCompleted(dp, false);
                        }
                    } else {
                        log("DcActiveState ERROR no such apnContext=" + dp.mApnContext
                                + " in this DC=" + this);
                        notifyDisconnectCompleted(dp, false);
                    }
                    retVal = HANDLED;
                    break;
                }
                case EVENT_DISCONNECT_ALL: {
                    if (DBG) {
                        log("DcActiveState msg.what=EVENT_DISCONNECT_ALL RefCount="
                                + mApnContexts.size() + " clearing apn contexts");
                    }
                    mApnContexts.clear();
                    DisconnectParams dp = (DisconnectParams) msg.obj;
                    mDisconnectParams = dp;
                    mConnectionParams = null;
                    dp.mTag = mTag;
                    tearDownData(dp);
                    transitionTo(mDisconnectingState);
                    retVal = HANDLED;
                    break;
                }
                case EVENT_LOST_CONNECTION: {
                    if (mRetryManager.isRetryNeeded()) {
                        // We're going to retry
                        int delayMillis = mRetryManager.getRetryTimer();
                        if (DBG) {
                            log("DcActiveState EVENT_LOST_CONNECTION startRetryAlarm"
                                    + " mTag=" + mTag + " delay=" + delayMillis + "ms");
                        }
                        mDcRetryAlarmController.startRetryAlarm(EVENT_RETRY_CONNECTION, mTag,
                                delayMillis);
                        transitionTo(mRetryingState);
                    } else {
                        mInactiveState.setEnterNotificationParams(DcFailCause.LOST_CONNECTION);
                        transitionTo(mInactiveState);
                    }
                    retVal = HANDLED;
                    break;
                }
                default:
                    if (VDBG) {
                        log("DcActiveState not handled msg.what=" + getWhatToString(msg.what));
                    }
                    retVal = NOT_HANDLED;
                    break;
            }
            return retVal;
        }
    }
    private DcActiveState mActiveState = new DcActiveState();

    /**
     * The state machine is disconnecting.
     */
    private class DcDisconnectingState extends State {
        @Override
        public boolean processMessage(Message msg) {
            boolean retVal;

            switch (msg.what) {
                case EVENT_CONNECT:
                    if (DBG) log("DcDisconnectingState msg.what=EVENT_CONNECT. Defer. RefCount = "
                            + mApnContexts.size());
                    deferMessage(msg);
                    retVal = HANDLED;
                    break;

                case EVENT_DEACTIVATE_DONE:
                    if (DBG) log("DcDisconnectingState msg.what=EVENT_DEACTIVATE_DONE RefCount="
                            + mApnContexts.size());
                    AsyncResult ar = (AsyncResult) msg.obj;
                    DisconnectParams dp = (DisconnectParams) ar.userObj;
                    if (dp.mTag == mTag) {
                        // Transition to inactive but send notifications after
                        // we've entered the mInactive state.
                        mInactiveState.setEnterNotificationParams((DisconnectParams) ar.userObj);
                        transitionTo(mInactiveState);
                    } else {
                        if (DBG) log("DcDisconnectState stale EVENT_DEACTIVATE_DONE"
                                + " dp.tag=" + dp.mTag + " mTag=" + mTag);
                    }
                    retVal = HANDLED;
                    break;

                default:
                    if (VDBG) {
                        log("DcDisconnectingState not handled msg.what="
                                + getWhatToString(msg.what));
                    }
                    retVal = NOT_HANDLED;
                    break;
            }
            return retVal;
        }
    }
    private DcDisconnectingState mDisconnectingState = new DcDisconnectingState();

    /**
     * The state machine is disconnecting after an creating a connection.
     */
    private class DcDisconnectionErrorCreatingConnection extends State {
        @Override
        public boolean processMessage(Message msg) {
            boolean retVal;

            switch (msg.what) {
                case EVENT_DEACTIVATE_DONE:
                    AsyncResult ar = (AsyncResult) msg.obj;
                    ConnectionParams cp = (ConnectionParams) ar.userObj;
                    if (cp.mTag == mTag) {
                        if (DBG) {
                            log("DcDisconnectionErrorCreatingConnection" +
                                " msg.what=EVENT_DEACTIVATE_DONE");
                        }

                        // Transition to inactive but send notifications after
                        // we've entered the mInactive state.
                        mInactiveState.setEnterNotificationParams(cp,
                                DcFailCause.UNACCEPTABLE_NETWORK_PARAMETER);
                        transitionTo(mInactiveState);
                    } else {
                        if (DBG) {
                            log("DcDisconnectionErrorCreatingConnection stale EVENT_DEACTIVATE_DONE"
                                    + " dp.tag=" + cp.mTag + ", mTag=" + mTag);
                        }
                    }
                    retVal = HANDLED;
                    break;

                default:
                    if (VDBG) {
                        log("DcDisconnectionErrorCreatingConnection not handled msg.what="
                                + getWhatToString(msg.what));
                    }
                    retVal = NOT_HANDLED;
                    break;
            }
            return retVal;
        }
    }
    private DcDisconnectionErrorCreatingConnection mDisconnectingErrorCreatingConnection =
                new DcDisconnectionErrorCreatingConnection();

    // ******* "public" interface

    /**
     * Used for testing purposes.
     */
    /* package */ void tearDownNow() {
        if (DBG) log("tearDownNow()");
        sendMessage(obtainMessage(EVENT_TEAR_DOWN_NOW));
    }

    /**
     * @return the string for msg.what as our info.
     */
    @Override
    protected String getWhatToString(int what) {
        return cmdToString(what);
    }

    private static String msgToString(Message msg) {
        String retVal;
        if (msg == null) {
            retVal = "null";
        } else {
            StringBuilder   b = new StringBuilder();

            b.append("{what=");
            b.append(cmdToString(msg.what));

            b.append(" when=");
            TimeUtils.formatDuration(msg.getWhen() - SystemClock.uptimeMillis(), b);

            if (msg.arg1 != 0) {
                b.append(" arg1=");
                b.append(msg.arg1);
            }

            if (msg.arg2 != 0) {
                b.append(" arg2=");
                b.append(msg.arg2);
            }

            if (msg.obj != null) {
                b.append(" obj=");
                b.append(msg.obj);
            }

            b.append(" target=");
            b.append(msg.getTarget());

            b.append(" replyTo=");
            b.append(msg.replyTo);

            b.append("}");

            retVal = b.toString();
        }
        return retVal;
    }

    static void slog(String s) {
        Rlog.d("DC", s);
    }

    /**
     * Log with debug
     *
     * @param s is string log
     */
    @Override
    protected void log(String s) {
        Rlog.d(getName(), s);
    }

    /**
     * Log with debug attribute
     *
     * @param s is string log
     */
    @Override
    protected void logd(String s) {
        Rlog.d(getName(), s);
    }

    /**
     * Log with verbose attribute
     *
     * @param s is string log
     */
    @Override
    protected void logv(String s) {
        Rlog.v(getName(), s);
    }

    /**
     * Log with info attribute
     *
     * @param s is string log
     */
    @Override
    protected void logi(String s) {
        Rlog.i(getName(), s);
    }

    /**
     * Log with warning attribute
     *
     * @param s is string log
     */
    @Override
    protected void logw(String s) {
        Rlog.w(getName(), s);
    }

    /**
     * Log with error attribute
     *
     * @param s is string log
     */
    @Override
    protected void loge(String s) {
        Rlog.e(getName(), s);
    }

    /**
     * Log with error attribute
     *
     * @param s is string log
     * @param e is a Throwable which logs additional information.
     */
    @Override
    protected void loge(String s, Throwable e) {
        Rlog.e(getName(), s, e);
    }

    /** Doesn't print mApnList of ApnContext's which would be recursive */
    public String toStringSimple() {
        return getName() + ": State=" + getCurrentState().getName()
                + " mApnSetting=" + mApnSetting + " RefCount=" + mApnContexts.size()
                + " mCid=" + mCid + " mCreateTime=" + mCreateTime
                + " mLastastFailTime=" + mLastFailTime
                + " mLastFailCause=" + mLastFailCause
                + " mTag=" + mTag
                + " mRetryManager=" + mRetryManager
                + " mLinkProperties=" + mLinkProperties
                + " mLinkCapabilities=" + mLinkCapabilities;
    }

    @Override
    public String toString() {
        return "{" + toStringSimple() + " mApnContexts=" + mApnContexts + "}";
    }

    /**
     * Dump the current state.
     *
     * @param fd
     * @param pw
     * @param args
     */
    @Override
    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.print("DataConnection ");
        super.dump(fd, pw, args);
        pw.println(" mApnContexts.size=" + mApnContexts.size());
        pw.println(" mApnContexts=" + mApnContexts);
        pw.flush();
        pw.println(" mDataConnectionTracker=" + mDct);
        pw.println(" mApnSetting=" + mApnSetting);
        pw.println(" mTag=" + mTag);
        pw.println(" mCid=" + mCid);
        pw.println(" mRetryManager=" + mRetryManager);
        pw.println(" mConnectionParams=" + mConnectionParams);
        pw.println(" mDisconnectParams=" + mDisconnectParams);
        pw.println(" mDcFailCause=" + mDcFailCause);
        pw.flush();
        pw.println(" mPhone=" + mPhone);
        pw.flush();
        pw.println(" mLinkProperties=" + mLinkProperties);
        pw.flush();
        pw.println(" mLinkCapabilities=" + mLinkCapabilities);
        pw.println(" mCreateTime=" + TimeUtils.logTimeOfDay(mCreateTime));
        pw.println(" mLastFailTime=" + TimeUtils.logTimeOfDay(mLastFailTime));
        pw.println(" mLastFailCause=" + mLastFailCause);
        pw.flush();
        pw.println(" mUserData=" + mUserData);
        pw.println(" mInstanceNumber=" + mInstanceNumber);
        pw.println(" mAc=" + mAc);
        pw.println(" mDcRetryAlarmController=" + mDcRetryAlarmController);
        pw.flush();
    }
}