1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package com.android.internal.util.test;
18
19import static org.junit.Assert.assertEquals;
20
21import android.os.Handler;
22import android.os.Looper;
23import android.os.Message;
24import android.os.Messenger;
25import android.util.Log;
26
27import com.android.internal.util.AsyncChannel;
28
29
30/**
31 * Provides an AsyncChannel interface that implements the connection initiating half of a
32 * bidirectional channel as described in {@link com.android.internal.util.AsyncChannel}.
33 */
34public class BidirectionalAsyncChannel {
35    private static final String TAG = "BidirectionalAsyncChannel";
36
37    private AsyncChannel mChannel;
38    public enum ChannelState { DISCONNECTED, HALF_CONNECTED, CONNECTED, FAILURE };
39    private ChannelState mState = ChannelState.DISCONNECTED;
40
41    public void assertConnected() {
42        assertEquals("AsyncChannel was not fully connected", ChannelState.CONNECTED, mState);
43    }
44
45    public void connect(final Looper looper, final Messenger messenger,
46            final Handler incomingMessageHandler) {
47        assertEquals("AsyncChannel must be disconnected to connect",
48                ChannelState.DISCONNECTED, mState);
49        mChannel = new AsyncChannel();
50        Handler rawMessageHandler = new Handler(looper) {
51                @Override
52                public void handleMessage(Message msg) {
53                    switch (msg.what) {
54                    case AsyncChannel.CMD_CHANNEL_HALF_CONNECTED:
55                        if (msg.arg1 == AsyncChannel.STATUS_SUCCESSFUL) {
56                            Log.d(TAG, "Successfully half connected " + this);
57                            mChannel.sendMessage(AsyncChannel.CMD_CHANNEL_FULL_CONNECTION);
58                            mState = ChannelState.HALF_CONNECTED;
59                        } else {
60                            Log.d(TAG, "Failed to connect channel " + this);
61                            mState = ChannelState.FAILURE;
62                            mChannel = null;
63                        }
64                        break;
65                    case AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED:
66                        mState = ChannelState.CONNECTED;
67                        Log.d(TAG, "Channel fully connected" + this);
68                        break;
69                    case AsyncChannel.CMD_CHANNEL_DISCONNECTED:
70                        mState = ChannelState.DISCONNECTED;
71                        mChannel = null;
72                        Log.d(TAG, "Channel disconnected" + this);
73                        break;
74                    default:
75                        incomingMessageHandler.handleMessage(msg);
76                        break;
77                    }
78                }
79            };
80        mChannel.connect(null, rawMessageHandler, messenger);
81    }
82
83    public void disconnect() {
84        assertEquals("AsyncChannel must be connected to disconnect",
85                ChannelState.CONNECTED, mState);
86        mChannel.sendMessage(AsyncChannel.CMD_CHANNEL_DISCONNECT);
87        mState = ChannelState.DISCONNECTED;
88        mChannel = null;
89    }
90
91    public void sendMessage(Message msg) {
92        assertEquals("AsyncChannel must be connected to send messages",
93                ChannelState.CONNECTED, mState);
94        mChannel.sendMessage(msg);
95    }
96}
97