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Jaeger Java bindings for OpenTracing API
/*
* Copyright (c) 2016, Uber Technologies, Inc
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.uber.jaeger.utils;
public class RateLimiter {
private final double creditsPerSecond;
private final double creditsPerNanosecond;
private final Clock clock;
private double balance;
private long lastTick;
public RateLimiter(double creditsPerSecond) {
this(creditsPerSecond, new SystemClock());
}
public RateLimiter(double creditsPerSecond, Clock clock) {
this.clock = clock;
this.creditsPerSecond = creditsPerSecond;
this.balance = creditsPerSecond;
this.creditsPerNanosecond = creditsPerSecond / 1.0e9;
}
public boolean checkCredit(double itemCost) {
long currentTime = clock.currentNanoTicks();
double elapsedTime = currentTime - lastTick;
lastTick = currentTime;
balance += elapsedTime * creditsPerNanosecond;
if (balance > creditsPerSecond) {
balance = creditsPerSecond;
}
if (balance >= itemCost) {
balance -= itemCost;
return true;
}
return false;
}
}
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