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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.server.wifi.util;
import com.android.server.wifi.Clock;
/**
* Manages a quota that is reset at the beginning of each new time period.
*/
public class TimedQuotaManager {
private final Clock mClock;
private final long mQuota;
private final long mPeriodMillis;
private final long mStartTimeMillis;
/**
* The number of elapsed periods between {@link #mStartTimeMillis} and the time of the last call
* to {@link #requestQuota()}.
*/
private long mLastPeriod;
/** How much quota has been consumed in the current period. */
private long mConsumedQuota;
/**
* Constructor.
* @param clock Clock instance.
* @param quota the maximum quota for a given period.
* @param periodMillis the quota will be reset at the beginning of each new period.
*/
public TimedQuotaManager(Clock clock, long quota, long periodMillis) {
mClock = clock;
mQuota = quota;
mPeriodMillis = periodMillis;
mStartTimeMillis = clock.getElapsedSinceBootMillis();
mLastPeriod = 0;
mConsumedQuota = 0;
}
/**
* Requests one quota. If there is sufficient remaining quota for the current period,
* returns true and consumes one quota. Otherwise, returns false.
*/
public boolean requestQuota() {
long currentPeriod = getCurrentPeriod();
if (mLastPeriod < currentPeriod) {
mLastPeriod = currentPeriod;
mConsumedQuota = 0;
}
if (mConsumedQuota < mQuota) {
mConsumedQuota++;
return true;
}
return false;
}
private long getCurrentPeriod() {
return (mClock.getElapsedSinceBootMillis() - mStartTimeMillis) / mPeriodMillis;
}
@Override
public String toString() {
return "TimedQuotaManager{"
+ "mQuota=" + mQuota
+ ", mPeriodMillis=" + mPeriodMillis
+ ", mStartTimeMillis=" + mStartTimeMillis
+ ", mLastPeriod=" + mLastPeriod
+ ", mConsumedQuota=" + mConsumedQuota
+ '}';
}
}
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