1/*
2 * Copyright (C) 2010, 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.server.sip;
18
19import android.os.PowerManager;
20import android.telephony.Rlog;
21
22import java.util.HashSet;
23
24class SipWakeLock {
25    private static final String TAG = "SipWakeLock";
26    private static final boolean DBG = false;
27    private PowerManager mPowerManager;
28    private PowerManager.WakeLock mWakeLock;
29    private PowerManager.WakeLock mTimerWakeLock;
30    private HashSet<Object> mHolders = new HashSet<Object>();
31
32    SipWakeLock(PowerManager powerManager) {
33        mPowerManager = powerManager;
34    }
35
36    synchronized void reset() {
37        if (DBG) log("reset count=" + mHolders.size());
38        mHolders.clear();
39        release(null);
40    }
41
42    synchronized void acquire(long timeout) {
43        if (mTimerWakeLock == null) {
44            mTimerWakeLock = mPowerManager.newWakeLock(
45                    PowerManager.PARTIAL_WAKE_LOCK, "SipWakeLock.timer");
46            mTimerWakeLock.setReferenceCounted(true);
47        }
48        mTimerWakeLock.acquire(timeout);
49    }
50
51    synchronized void acquire(Object holder) {
52        mHolders.add(holder);
53        if (mWakeLock == null) {
54            mWakeLock = mPowerManager.newWakeLock(
55                    PowerManager.PARTIAL_WAKE_LOCK, "SipWakeLock");
56        }
57        if (!mWakeLock.isHeld()) mWakeLock.acquire();
58        if (DBG) log("acquire count=" + mHolders.size());
59    }
60
61    synchronized void release(Object holder) {
62        mHolders.remove(holder);
63        if ((mWakeLock != null) && mHolders.isEmpty()
64                && mWakeLock.isHeld()) {
65            mWakeLock.release();
66        }
67        if (DBG) log("release count=" + mHolders.size());
68    }
69
70    private void log(String s) {
71        Rlog.d(TAG, s);
72    }
73}
74