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/*
* Copyright (C) 2023 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.flags
import android.util.Log
import com.android.systemui.dagger.qualifiers.Application
import com.android.systemui.dagger.qualifiers.Background
import java.util.concurrent.TimeUnit
import javax.inject.Inject
import javax.inject.Named
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
/** Restarts the process after all passed in [Condition]s are true. */
class ConditionalRestarter
@Inject
constructor(
private val systemExitRestarter: SystemExitRestarter,
private val conditions: Set<@JvmSuppressWildcards Condition>,
@Named(RESTART_DELAY) private val restartDelaySec: Long,
@Application private val applicationScope: CoroutineScope,
@Background private val backgroundDispatcher: CoroutineDispatcher,
) : Restarter {
private var restartJob: Job? = null
private var pendingReason = ""
private var androidRestartRequested = false
override fun restartSystemUI(reason: String) {
Log.d(FeatureFlagsDebug.TAG, "SystemUI Restart requested. Restarting when idle.")
scheduleRestart(reason)
}
override fun restartAndroid(reason: String) {
Log.d(FeatureFlagsDebug.TAG, "Android Restart requested. Restarting when idle.")
androidRestartRequested = true
scheduleRestart(reason)
}
private fun scheduleRestart(reason: String = "") {
pendingReason = if (reason.isEmpty()) pendingReason else reason
if (conditions.all { c -> c.canRestartNow(this::scheduleRestart) }) {
if (restartJob == null) {
restartJob =
applicationScope.launch(backgroundDispatcher) {
delay(TimeUnit.SECONDS.toMillis(restartDelaySec))
restartNow()
}
}
} else {
restartJob?.cancel()
restartJob = null
}
}
private fun restartNow() {
if (androidRestartRequested) {
systemExitRestarter.restartAndroid(pendingReason)
} else {
systemExitRestarter.restartSystemUI(pendingReason)
}
}
interface Condition {
/**
* Should return true if the system is ready to restart.
*
* A call to this function means that we want to restart and are waiting for this condition
* to return true.
*
* retryFn should be cached if it is _not_ ready to restart, and later called when it _is_
* ready to restart. At that point, this method will be called again to verify that the
* system is ready.
*
* Multiple calls to an instance of this method may happen for a single restart attempt if
* multiple [Condition]s are being checked. If any one [Condition] returns false, all the
* [Condition]s will need to be rechecked on the next restart attempt.
*/
fun canRestartNow(retryFn: () -> Unit): Boolean
}
companion object {
const val RESTART_DELAY = "restarter_restart_delay"
}
}
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