76 lines
2.7 KiB
Java
76 lines
2.7 KiB
Java
|
/*
|
||
|
|
* 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);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|