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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.systemui.broadcast
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.util.ArraySet
import com.android.systemui.Dumpable
import com.android.systemui.broadcast.logging.BroadcastDispatcherLogger
import com.android.systemui.util.indentIfPossible
import java.io.FileDescriptor
import java.io.PrintWriter
import java.util.concurrent.Executor
import java.util.concurrent.atomic.AtomicInteger
/**
* Receiver for a given action-userId pair to be used by [UserBroadcastDispatcher].
*
* Each object of this class will take care of a single Action. It will register if it has at least
* one [BroadcastReceiver] added to it, and unregister when none are left.
*
* It will also re-register if filters with new categories are added. But this should not happen
* often.
*
* This class has no sync controls, so make sure to only make modifications from the background
* thread.
*/
class ActionReceiver(
private val action: String,
private val userId: Int,
private val registerAction: BroadcastReceiver.(IntentFilter) -> Unit,
private val unregisterAction: BroadcastReceiver.() -> Unit,
private val bgExecutor: Executor,
private val logger: BroadcastDispatcherLogger
) : BroadcastReceiver(), Dumpable {
companion object {
val index = AtomicInteger(0)
}
var registered = false
private set
private val receiverDatas = ArraySet<ReceiverData>()
private val activeCategories = ArraySet<String>()
@Throws(IllegalArgumentException::class)
fun addReceiverData(receiverData: ReceiverData) {
if (!receiverData.filter.hasAction(action)) {
throw(IllegalArgumentException("Trying to attach to $action without correct action," +
"receiver: ${receiverData.receiver}"))
}
val addedCategories = activeCategories
.addAll(receiverData.filter.categoriesIterator()?.asSequence() ?: emptySequence())
if (receiverDatas.add(receiverData) && receiverDatas.size == 1) {
registerAction(createFilter())
registered = true
} else if (addedCategories) {
unregisterAction()
registerAction(createFilter())
}
}
fun hasReceiver(receiver: BroadcastReceiver): Boolean {
return receiverDatas.any { it.receiver == receiver }
}
private fun createFilter(): IntentFilter {
val filter = IntentFilter(action)
activeCategories.forEach(filter::addCategory)
return filter
}
fun removeReceiver(receiver: BroadcastReceiver) {
if (receiverDatas.removeAll { it.receiver == receiver } &&
receiverDatas.isEmpty() && registered) {
unregisterAction()
registered = false
activeCategories.clear()
}
}
@Throws(IllegalStateException::class)
override fun onReceive(context: Context, intent: Intent) {
if (intent.action != action) {
throw(IllegalStateException("Received intent for ${intent.action} " +
"in receiver for $action}"))
}
val id = index.getAndIncrement()
logger.logBroadcastReceived(id, userId, intent)
// Immediately return control to ActivityManager
bgExecutor.execute {
receiverDatas.forEach {
if (it.filter.matchCategories(intent.categories) == null) {
it.executor.execute {
it.receiver.pendingResult = pendingResult
it.receiver.onReceive(context, intent)
logger.logBroadcastDispatched(id, action, it.receiver)
}
}
}
}
}
override fun dump(fd: FileDescriptor, pw: PrintWriter, args: Array<out String>) {
pw.indentIfPossible {
println("Registered: $registered")
println("Receivers:")
pw.indentIfPossible {
receiverDatas.forEach {
println(it.receiver)
}
}
println("Categories: ${activeCategories.joinToString(", ")}")
}
}
}
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