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/*
* Copyright (C) 2022 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.safetycenter;
import static android.os.Build.VERSION_CODES.TIRAMISU;
import android.os.Handler;
import androidx.annotation.RequiresApi;
import com.android.permission.util.ForegroundThread;
import java.io.PrintWriter;
import java.time.Duration;
import java.util.ArrayDeque;
import java.util.Iterator;
import javax.annotation.concurrent.NotThreadSafe;
/**
* A class to track timeouts related to Safety Center.
*
* <p>This class isn't thread safe. Thread safety must be handled by the caller.
*/
@RequiresApi(TIRAMISU)
@NotThreadSafe
final class SafetyCenterTimeouts {
/**
* The maximum number of timeouts we are tracking at a given time. This is to avoid having the
* {@code mTimeouts} queue grow unbounded. In practice, we should never have more than 1 or 2
* timeouts in flight.
*/
private static final int MAX_TRACKED = 10;
private final ArrayDeque<Runnable> mTimeouts = new ArrayDeque<>(MAX_TRACKED);
private final Handler mForegroundHandler = ForegroundThread.getHandler();
SafetyCenterTimeouts() {}
/** Adds the given {@link Runnable} to run as a timeout after the given {@link Duration}. */
void add(Runnable timeoutAction, Duration timeoutDuration) {
if (mTimeouts.size() + 1 >= MAX_TRACKED) {
remove(mTimeouts.pollFirst());
}
mTimeouts.addLast(timeoutAction);
mForegroundHandler.postDelayed(timeoutAction, timeoutDuration.toMillis());
}
/** Removes the given {@link Runnable} to run as a timeout. */
void remove(Runnable timeoutAction) {
mTimeouts.remove(timeoutAction);
mForegroundHandler.removeCallbacks(timeoutAction);
}
/** Clears all timeouts. */
void clear() {
while (!mTimeouts.isEmpty()) {
mForegroundHandler.removeCallbacks(mTimeouts.pollFirst());
}
}
/** Dumps state for debugging purposes. */
void dump(PrintWriter fout) {
int count = mTimeouts.size();
fout.println("TIMEOUTS (" + count + ")");
Iterator<Runnable> it = mTimeouts.iterator();
int i = 0;
while (it.hasNext()) {
fout.println("\t[" + i++ + "] " + it.next());
}
fout.println();
}
}
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