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/*
* 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.apache.lucene.store;
import org.apache.lucene.store.IOContext.Context;
import java.io.IOException;
public final class RateLimitedFSDirectory extends FilterDirectory {
private final StoreRateLimiting.Provider rateLimitingProvider;
private final StoreRateLimiting.Listener rateListener;
public RateLimitedFSDirectory(Directory wrapped, StoreRateLimiting.Provider rateLimitingProvider,
StoreRateLimiting.Listener rateListener) {
super(wrapped);
this.rateLimitingProvider = rateLimitingProvider;
this.rateListener = rateListener;
}
@Override
public IndexOutput createOutput(String name, IOContext context) throws IOException {
final IndexOutput output = in.createOutput(name, context);
StoreRateLimiting rateLimiting = rateLimitingProvider.rateLimiting();
StoreRateLimiting.Type type = rateLimiting.getType();
RateLimiter limiter = rateLimiting.getRateLimiter();
if (type == StoreRateLimiting.Type.NONE || limiter == null) {
return output;
}
if (context.context == Context.MERGE || type == StoreRateLimiting.Type.ALL) {
// we are merging, and type is either MERGE or ALL, rate limit...
return new RateLimitedIndexOutput(new RateLimiterWrapper(limiter, rateListener), output);
}
// we shouldn't really get here...
return output;
}
@Override
public void close() throws IOException {
in.close();
}
@Override
public String toString() {
StoreRateLimiting rateLimiting = rateLimitingProvider.rateLimiting();
StoreRateLimiting.Type type = rateLimiting.getType();
RateLimiter limiter = rateLimiting.getRateLimiter();
if (type == StoreRateLimiting.Type.NONE || limiter == null) {
return StoreUtils.toString(in);
} else {
return "rate_limited(" + StoreUtils.toString(in) + ", type=" + type.name() + ", rate=" + limiter.getMBPerSec() + ")";
}
}
// we wrap the limiter to notify our store if we limited to get statistics
static final class RateLimiterWrapper extends RateLimiter {
private final RateLimiter delegate;
private final StoreRateLimiting.Listener rateListener;
RateLimiterWrapper(RateLimiter delegate, StoreRateLimiting.Listener rateListener) {
this.delegate = delegate;
this.rateListener = rateListener;
}
@Override
public void setMBPerSec(double mbPerSec) {
delegate.setMBPerSec(mbPerSec);
}
@Override
public double getMBPerSec() {
return delegate.getMBPerSec();
}
@Override
public long pause(long bytes) throws IOException {
long pause = delegate.pause(bytes);
rateListener.onPause(pause);
return pause;
}
@Override
public long getMinPauseCheckBytes() {
return delegate.getMinPauseCheckBytes();
}
}
}