19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.os; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.WeakHashMap; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.Set; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.Log; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Helper class that helps you use IBinder objects as reference counted 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * tokens. IBinders make good tokens because we find out when they are 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * removed 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic abstract class TokenWatcher 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project{ 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Construct the TokenWatcher 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param h A handler to call {@link #acquired} and {@link #released} 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * on. If you don't care, just call it like this, although your thread 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will have to be a Looper thread. 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>new TokenWatcher(new Handler())</code> 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param tag A debugging tag for this TokenWatcher 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public TokenWatcher(Handler h, String tag) 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mHandler = h; 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTag = tag != null ? tag : "TokenWatcher"; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when the number of active tokens goes from 0 to 1. 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public abstract void acquired(); 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when the number of active tokens goes from 1 to 0. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public abstract void released(); 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Record that this token has been acquired. When acquire is called, and 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the current count is 0, the acquired method is called on the given 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * handler. 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param token An IBinder object. If this token has already been acquired, 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * no action is taken. 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param tag A string used by the {@link #dump} method for debugging, 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to see who has references. 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void acquire(IBinder token, String tag) 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project synchronized (mTokens) { 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // explicitly checked to avoid bogus sendNotification calls because 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // of the WeakHashMap and the GC 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldSize = mTokens.size(); 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Death d = new Death(token, tag); 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project token.linkToDeath(d, 0); 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } catch (RemoteException e) { 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTokens.put(token, d); 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (oldSize == 0 && !mAcquired) { 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project sendNotificationLocked(true); 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mAcquired = true; 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void cleanup(IBinder token, boolean unlink) 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project synchronized (mTokens) { 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Death d = mTokens.remove(token); 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (unlink && d != null) { 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project d.token.unlinkToDeath(d, 0); 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project d.token = null; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTokens.size() == 0 && mAcquired) { 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project sendNotificationLocked(false); 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mAcquired = false; 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void release(IBinder token) 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project cleanup(token, true); 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isAcquired() 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project synchronized (mTokens) { 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mAcquired; 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void dump() 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project synchronized (mTokens) { 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Set<IBinder> keys = mTokens.keySet(); 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Log.i(mTag, "Token count: " + mTokens.size()); 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int i = 0; 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (IBinder b: keys) { 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Log.i(mTag, "[" + i + "] " + mTokens.get(b).tag + " - " + b); 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project i++; 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private Runnable mNotificationTask = new Runnable() { 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void run() 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int value; 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project synchronized (mTokens) { 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project value = mNotificationQueue; 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNotificationQueue = -1; 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (value == 1) { 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project acquired(); 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project else if (value == 0) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project released(); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project }; 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void sendNotificationLocked(boolean on) 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int value = on ? 1 : 0; 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mNotificationQueue == -1) { 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // empty 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNotificationQueue = value; 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mHandler.post(mNotificationTask); 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project else if (mNotificationQueue != value) { 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it's a pair, so cancel it 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mNotificationQueue = -1; 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mHandler.removeCallbacks(mNotificationTask); 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // else, same so do nothing -- maybe we should warn? 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private class Death implements IBinder.DeathRecipient 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project IBinder token; 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project String tag; 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Death(IBinder token, String tag) 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this.token = token; 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this.tag = tag; 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void binderDied() 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project cleanup(token, false); 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void finalize() throws Throwable 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project { 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project try { 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (token != null) { 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Log.w(mTag, "cleaning up leaked reference: " + tag); 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project release(token); 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project finally { 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.finalize(); 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private WeakHashMap<IBinder,Death> mTokens = new WeakHashMap<IBinder,Death>(); 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private Handler mHandler; 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private String mTag; 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mNotificationQueue = -1; 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private volatile boolean mAcquired = false; 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 198