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/*
* Copyright (C) 2019 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
import android.util.Log
import com.android.internal.annotations.GuardedBy
import com.android.systemui.dagger.SysUISingleton
import com.android.systemui.dump.DumpManager
import java.io.FileDescriptor
import java.io.PrintWriter
import java.lang.ref.WeakReference
import java.util.concurrent.atomic.AtomicBoolean
import javax.inject.Inject
/**
* Caches whether the device has reached [SystemService.PHASE_BOOT_COMPLETED].
*
* This class is constructed and set by [SystemUIApplication] and will notify all listeners when
* boot is completed.
*/
@SysUISingleton
class BootCompleteCacheImpl @Inject constructor(dumpManager: DumpManager) :
BootCompleteCache, Dumpable {
companion object {
private const val TAG = "BootCompleteCacheImpl"
private const val DEBUG = false
}
init {
dumpManager.registerDumpable(TAG, this)
}
@GuardedBy("listeners")
private val listeners = mutableListOf<WeakReference<BootCompleteCache.BootCompleteListener>>()
private val bootComplete = AtomicBoolean(false)
/**
* Provides the current boot state of the system as determined by [SystemUIApplication].
* @return `true` if the system has reached [SystemService.PHASE_BOOT_COMPLETED]
*/
override fun isBootComplete(): Boolean = bootComplete.get()
/**
* Indicates to this object that boot is complete. Subsequent calls to this function will have
* no effect.
*/
fun setBootComplete() {
if (bootComplete.compareAndSet(false, true)) {
if (DEBUG) Log.d(TAG, "Boot complete set")
synchronized(listeners) {
listeners.forEach {
it.get()?.onBootComplete()
}
listeners.clear()
}
}
}
/**
* Add a listener for boot complete event. It will immediately return the current boot complete
* state. If this value is true, [BootCompleteCache.BootCompleteListener.onBootComplete] will
* never be called.
*
* @param listener a listener for boot complete state.
* @return `true` if boot has been completed.
*/
override fun addListener(listener: BootCompleteCache.BootCompleteListener): Boolean {
if (bootComplete.get()) return true
synchronized(listeners) {
if (bootComplete.get()) return true
listeners.add(WeakReference(listener))
if (DEBUG) Log.d(TAG, "Adding listener: $listener")
return false
}
}
/**
* Removes a listener for boot complete event.
*
* @param listener a listener to removed.
*/
override fun removeListener(listener: BootCompleteCache.BootCompleteListener) {
if (bootComplete.get()) return
synchronized(listeners) {
listeners.removeIf { it.get() == null || it.get() === listener }
if (DEBUG) Log.d(TAG, "Removing listener: $listener")
}
}
override fun dump(fd: FileDescriptor, pw: PrintWriter, args: Array<out String>) {
pw.println("BootCompleteCache state:")
pw.println(" boot complete: ${isBootComplete()}")
if (!isBootComplete()) {
pw.println(" listeners:")
synchronized(listeners) {
listeners.forEach {
pw.println(" $it")
}
}
}
}
}
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