1 /* 2 * Copyright (C) 2015 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.telecom; 18 19 import android.content.BroadcastReceiver; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.IntentFilter; 23 import android.telecom.Log; 24 25 import com.android.internal.annotations.VisibleForTesting; 26 import com.android.internal.util.IndentingPrintWriter; 27 28 import java.util.Collections; 29 import java.util.Set; 30 import java.util.concurrent.ConcurrentHashMap; 31 32 /** 33 * Listens for and caches car dock state. 34 * Testing; you can enable/disable dock with adb commands: 35 * adb shell dumpsys DockObserver set state 3 36 * adb shell dumpsys DockObserver set state 0 37 */ 38 @VisibleForTesting 39 public class DockManager { 40 @VisibleForTesting 41 public interface Listener { onDockChanged(boolean isDocked)42 void onDockChanged(boolean isDocked); 43 } 44 45 /** Receiver for car dock plugged and unplugged events. */ 46 private class DockBroadcastReceiver extends BroadcastReceiver { 47 @Override onReceive(Context context, Intent intent)48 public void onReceive(Context context, Intent intent) { 49 Log.startSession("DM.oR"); 50 try { 51 if (Intent.ACTION_DOCK_EVENT.equals(intent.getAction())) { 52 int dockState = intent.getIntExtra( 53 Intent.EXTRA_DOCK_STATE, Intent.EXTRA_DOCK_STATE_UNDOCKED); 54 onDockChanged(dockState); 55 } 56 } finally { 57 Log.endSession(); 58 } 59 } 60 } 61 62 private final DockBroadcastReceiver mReceiver; 63 64 /** 65 * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is 66 * load factor before resizing, 1 means we only expect a single thread to 67 * access the map so make only a single shard 68 */ 69 private final Set<Listener> mListeners = Collections.newSetFromMap( 70 new ConcurrentHashMap<Listener, Boolean>(8, 0.9f, 1)); 71 72 private int mDockState = Intent.EXTRA_DOCK_STATE_UNDOCKED; 73 DockManager(Context context)74 DockManager(Context context) { 75 mReceiver = new DockBroadcastReceiver(); 76 77 // Register for misc other intent broadcasts. 78 IntentFilter intentFilter = new IntentFilter(Intent.ACTION_DOCK_EVENT); 79 intentFilter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY); 80 context.registerReceiver(mReceiver, intentFilter); 81 } 82 83 @VisibleForTesting addListener(Listener listener)84 public void addListener(Listener listener) { 85 mListeners.add(listener); 86 } 87 removeListener(Listener listener)88 void removeListener(Listener listener) { 89 if (listener != null) { 90 mListeners.remove(listener); 91 } 92 } 93 isDocked()94 boolean isDocked() { 95 switch (mDockState) { 96 case Intent.EXTRA_DOCK_STATE_DESK: 97 case Intent.EXTRA_DOCK_STATE_HE_DESK: 98 case Intent.EXTRA_DOCK_STATE_LE_DESK: 99 case Intent.EXTRA_DOCK_STATE_CAR: 100 return true; 101 default: 102 return false; 103 } 104 } 105 onDockChanged(int dockState)106 private void onDockChanged(int dockState) { 107 if (mDockState != dockState) { 108 Log.v(this, "onDockChanged: is docked?%b", dockState == Intent.EXTRA_DOCK_STATE_CAR); 109 mDockState = dockState; 110 for (Listener listener : mListeners) { 111 listener.onDockChanged(isDocked()); 112 } 113 } 114 } 115 116 /** 117 * Dumps the state of the {@link DockManager}. 118 * 119 * @param pw The {@code IndentingPrintWriter} to write the state to. 120 */ dump(IndentingPrintWriter pw)121 public void dump(IndentingPrintWriter pw) { 122 pw.println("mIsDocked: " + isDocked()); 123 } 124 } 125