Fabian Kozynski | 42f86a0 | 2019-07-09 12:39:03 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 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.systemui.broadcast |
| 18 | |
| 19 | import android.content.BroadcastReceiver |
| 20 | import android.content.Context |
| 21 | import android.content.Intent |
| 22 | import android.content.IntentFilter |
| 23 | import android.os.Handler |
| 24 | import android.os.Looper |
| 25 | import android.os.Message |
| 26 | import android.os.UserHandle |
| 27 | import android.util.ArrayMap |
| 28 | import android.util.ArraySet |
| 29 | import android.util.Log |
| 30 | import com.android.systemui.Dumpable |
| 31 | import java.io.FileDescriptor |
| 32 | import java.io.PrintWriter |
| 33 | import java.util.concurrent.atomic.AtomicBoolean |
| 34 | |
| 35 | private const val MSG_REGISTER_RECEIVER = 0 |
| 36 | private const val MSG_UNREGISTER_RECEIVER = 1 |
Fabian Kozynski | ff5e91f | 2019-09-24 15:38:08 -0400 | [diff] [blame] | 37 | private const val TAG = "UserBroadcastDispatcher" |
Fabian Kozynski | 42f86a0 | 2019-07-09 12:39:03 -0400 | [diff] [blame] | 38 | private const val DEBUG = false |
| 39 | |
| 40 | /** |
| 41 | * Broadcast dispatcher for a given user registration [userId]. |
| 42 | * |
| 43 | * Created by [BroadcastDispatcher] as needed by users. The value of [userId] can be |
| 44 | * [UserHandle.USER_ALL]. |
| 45 | */ |
| 46 | class UserBroadcastDispatcher( |
| 47 | private val context: Context, |
| 48 | private val userId: Int, |
| 49 | private val mainHandler: Handler, |
| 50 | private val bgLooper: Looper |
| 51 | ) : BroadcastReceiver(), Dumpable { |
| 52 | |
| 53 | private val bgHandler = object : Handler(bgLooper) { |
| 54 | override fun handleMessage(msg: Message) { |
| 55 | when (msg.what) { |
| 56 | MSG_REGISTER_RECEIVER -> handleRegisterReceiver(msg.obj as ReceiverData) |
| 57 | MSG_UNREGISTER_RECEIVER -> handleUnregisterReceiver(msg.obj as BroadcastReceiver) |
| 58 | else -> Unit |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | private val registered = AtomicBoolean(false) |
| 64 | |
| 65 | internal fun isRegistered() = registered.get() |
| 66 | |
| 67 | private val registerReceiver = Runnable { |
| 68 | val categories = mutableSetOf<String>() |
| 69 | receiverToReceiverData.values.flatten().forEach { |
| 70 | it.filter.categoriesIterator()?.asSequence()?.let { |
| 71 | categories.addAll(it) |
| 72 | } |
| 73 | } |
| 74 | val intentFilter = IntentFilter().apply { |
| 75 | actionsToReceivers.keys.forEach { addAction(it) } |
| 76 | categories.forEach { addCategory(it) } |
| 77 | } |
| 78 | |
| 79 | if (registered.get()) { |
| 80 | context.unregisterReceiver(this) |
| 81 | registered.set(false) |
| 82 | } |
| 83 | // Short interval without receiver, this can be problematic |
| 84 | if (intentFilter.countActions() > 0 && !registered.get()) { |
| 85 | context.registerReceiverAsUser( |
| 86 | this, |
| 87 | UserHandle.of(userId), |
| 88 | intentFilter, |
| 89 | null, |
| 90 | bgHandler) |
| 91 | registered.set(true) |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | // Only modify in BG thread |
| 96 | private val actionsToReceivers = ArrayMap<String, MutableSet<ReceiverData>>() |
| 97 | private val receiverToReceiverData = ArrayMap<BroadcastReceiver, MutableSet<ReceiverData>>() |
| 98 | |
| 99 | override fun onReceive(context: Context, intent: Intent) { |
Fabian Kozynski | ff5e91f | 2019-09-24 15:38:08 -0400 | [diff] [blame] | 100 | bgHandler.post(HandleBroadcastRunnable(actionsToReceivers, context, intent, pendingResult)) |
Fabian Kozynski | 42f86a0 | 2019-07-09 12:39:03 -0400 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Register a [ReceiverData] for this user. |
| 105 | */ |
| 106 | fun registerReceiver(receiverData: ReceiverData) { |
| 107 | bgHandler.obtainMessage(MSG_REGISTER_RECEIVER, receiverData).sendToTarget() |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Unregister a given [BroadcastReceiver] for this user. |
| 112 | */ |
| 113 | fun unregisterReceiver(receiver: BroadcastReceiver) { |
| 114 | bgHandler.obtainMessage(MSG_UNREGISTER_RECEIVER, receiver).sendToTarget() |
| 115 | } |
| 116 | |
| 117 | private fun handleRegisterReceiver(receiverData: ReceiverData) { |
| 118 | if (DEBUG) Log.w(TAG, "Register receiver: ${receiverData.receiver}") |
| 119 | receiverToReceiverData.getOrPut(receiverData.receiver, { ArraySet() }).add(receiverData) |
| 120 | var changed = false |
| 121 | // Index the BroadcastReceiver by all its actions, that way it's easier to dispatch given |
| 122 | // a received intent. |
| 123 | receiverData.filter.actionsIterator().forEach { |
| 124 | actionsToReceivers.getOrPut(it) { |
| 125 | changed = true |
| 126 | ArraySet() |
| 127 | }.add(receiverData) |
| 128 | } |
| 129 | if (changed) { |
| 130 | mainHandler.post(registerReceiver) |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | private fun handleUnregisterReceiver(receiver: BroadcastReceiver) { |
| 135 | if (DEBUG) Log.w(TAG, "Unregister receiver: $receiver") |
| 136 | val actions = receiverToReceiverData.getOrElse(receiver) { return } |
| 137 | .flatMap { it.filter.actionsIterator().asSequence().asIterable() }.toSet() |
| 138 | receiverToReceiverData.get(receiver)?.clear() |
| 139 | var changed = false |
| 140 | actions.forEach { action -> |
| 141 | actionsToReceivers.get(action)?.removeIf { it.receiver == receiver } |
| 142 | if (actionsToReceivers.get(action)?.isEmpty() ?: false) { |
| 143 | changed = true |
| 144 | actionsToReceivers.remove(action) |
| 145 | } |
| 146 | } |
| 147 | if (changed) { |
| 148 | mainHandler.post(registerReceiver) |
| 149 | } |
| 150 | } |
| 151 | |
Lucas Dupin | 64171fe | 2019-10-30 14:28:29 -0700 | [diff] [blame] | 152 | override fun dump(fd: FileDescriptor, pw: PrintWriter, args: Array<out String>) { |
| 153 | pw.println(" Registered=${registered.get()}") |
Fabian Kozynski | 42f86a0 | 2019-07-09 12:39:03 -0400 | [diff] [blame] | 154 | actionsToReceivers.forEach { (action, list) -> |
Lucas Dupin | 64171fe | 2019-10-30 14:28:29 -0700 | [diff] [blame] | 155 | pw.println(" $action:") |
| 156 | list.forEach { pw.println(" ${it.receiver}") } |
Fabian Kozynski | 42f86a0 | 2019-07-09 12:39:03 -0400 | [diff] [blame] | 157 | } |
| 158 | } |
| 159 | |
| 160 | private class HandleBroadcastRunnable( |
| 161 | val actionsToReceivers: Map<String, Set<ReceiverData>>, |
| 162 | val context: Context, |
Fabian Kozynski | ff5e91f | 2019-09-24 15:38:08 -0400 | [diff] [blame] | 163 | val intent: Intent, |
| 164 | val pendingResult: PendingResult |
Fabian Kozynski | 42f86a0 | 2019-07-09 12:39:03 -0400 | [diff] [blame] | 165 | ) : Runnable { |
| 166 | override fun run() { |
| 167 | if (DEBUG) Log.w(TAG, "Dispatching $intent") |
| 168 | actionsToReceivers.get(intent.action) |
| 169 | ?.filter { |
| 170 | it.filter.hasAction(intent.action) && |
| 171 | it.filter.matchCategories(intent.categories) == null } |
| 172 | ?.forEach { |
| 173 | it.handler.post { |
| 174 | if (DEBUG) Log.w(TAG, "Dispatching to ${it.receiver}") |
Fabian Kozynski | ff5e91f | 2019-09-24 15:38:08 -0400 | [diff] [blame] | 175 | it.receiver.pendingResult = pendingResult |
Fabian Kozynski | 42f86a0 | 2019-07-09 12:39:03 -0400 | [diff] [blame] | 176 | it.receiver.onReceive(context, intent) |
| 177 | } |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | } |