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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.permission.util;
import android.annotation.NonNull;
import android.os.Handler;
import android.os.SystemClock;
import com.android.internal.annotations.GuardedBy;
/**
* A throttled runnable that can wrap around a runnable and throttle calls to its run().
*
* The throttling logic makes sure that the original runnable will be called only after the
* specified interval passes since the last actual call. The first call in a while (after the
* specified interval passes since the last actual call) will always result in the original runnable
* being called immediately, and then subsequent calls will start to be throttled. It is guaranteed
* that any call to this throttled runnable will always result in the original runnable being called
* afterwards, within the specified interval.
*/
public class ThrottledRunnable implements Runnable {
@NonNull
private final Handler mHandler;
private final long mIntervalMillis;
@NonNull
private final Runnable mRunnable;
@NonNull
private final Object mLock = new Object();
@GuardedBy("mLock")
private long mScheduledUptimeMillis;
public ThrottledRunnable(@NonNull Handler handler, long intervalMillis,
@NonNull Runnable runnable) {
mHandler = handler;
mIntervalMillis = intervalMillis;
mRunnable = runnable;
}
@Override
public void run() {
synchronized (mLock) {
if (mHandler.hasCallbacks(mRunnable)) {
// We have a scheduled runnable.
return;
}
long currentUptimeMillis = SystemClock.uptimeMillis();
if (mScheduledUptimeMillis == 0
|| currentUptimeMillis > mScheduledUptimeMillis + mIntervalMillis) {
// First time in a while, schedule immediately.
mScheduledUptimeMillis = currentUptimeMillis;
} else {
// We were scheduled not long ago, so schedule with delay for throttling.
mScheduledUptimeMillis = mScheduledUptimeMillis + mIntervalMillis;
}
mHandler.postAtTime(mRunnable, mScheduledUptimeMillis);
}
}
}
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