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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.common.util;
import org.apache.lucene.store.RateLimiter;
import org.elasticsearch.common.unit.ByteSizeValue;
import java.util.concurrent.atomic.AtomicLong;
/**
* A rate limiter designed for multiple concurrent users.
*/
public class CombinedRateLimiter {
// TODO: This rate limiter has some concurrency issues between the two maybePause operations
private final AtomicLong bytesSinceLastPause = new AtomicLong();
private final RateLimiter.SimpleRateLimiter rateLimiter;
private volatile boolean rateLimit;
public CombinedRateLimiter(ByteSizeValue maxBytesPerSec) {
rateLimit = maxBytesPerSec.getBytes() > 0;
rateLimiter = new RateLimiter.SimpleRateLimiter(maxBytesPerSec.getMbFrac());
}
public long maybePause(int bytes) {
if (rateLimit) {
long bytesSincePause = bytesSinceLastPause.addAndGet(bytes);
if (bytesSincePause > rateLimiter.getMinPauseCheckBytes()) {
// Time to pause
bytesSinceLastPause.addAndGet(-bytesSincePause);
return Math.max(rateLimiter.pause(bytesSincePause), 0);
}
}
return 0;
}
public void setMBPerSec(ByteSizeValue maxBytesPerSec) {
rateLimit = maxBytesPerSec.getBytes() > 0;
rateLimiter.setMBPerSec(maxBytesPerSec.getMbFrac());
}
}