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 
17 package com.android.server.sip;
18 
19 import android.os.PowerManager;
20 import android.telephony.Rlog;
21 
22 import java.util.HashSet;
23 
24 class 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 
SipWakeLock(PowerManager powerManager)32     SipWakeLock(PowerManager powerManager) {
33         mPowerManager = powerManager;
34     }
35 
reset()36     synchronized void reset() {
37         if (DBG) log("reset count=" + mHolders.size());
38         mHolders.clear();
39         release(null);
40     }
41 
acquire(long timeout)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 
acquire(Object holder)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 
release(Object holder)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 
log(String s)70     private void log(String s) {
71         Rlog.d(TAG, s);
72     }
73 }
74