org.elasticsearch.cluster.metadata.MetaDataService Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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.cluster.metadata;
import org.elasticsearch.cluster.routing.operation.hash.djb.DjbHashFunction;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
/**
*/
public class MetaDataService extends AbstractComponent {
private final MdLock[] indexMdLocks;
@Inject
public MetaDataService(Settings settings) {
super(settings);
indexMdLocks = new MdLock[500];
for (int i = 0; i < indexMdLocks.length; i++) {
indexMdLocks[i] = new MdLock();
}
}
public MdLock indexMetaDataLock(String index) {
return indexMdLocks[Math.abs(DjbHashFunction.DJB_HASH(index) % indexMdLocks.length)];
}
public class MdLock {
private boolean isLocked = false;
public synchronized void lock() throws InterruptedException {
while (isLocked) {
wait();
}
isLocked = true;
}
public synchronized void unlock() {
isLocked = false;
notifyAll();
}
}
}