/*
* Copyright (c) 2017 Strapdata (http://www.strapdata.com)
* Contains some code from Elasticsearch (http://www.elastic.co)
*
* 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 org.elassandra.cluster.routing;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.routing.ShardRoutingState;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.transport.TransportAddress;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
/**
* For each newRoute(), returns all local ranges and randomly pickup ranges from available nodes (may be unbalanced).
*
* @author vroyer
*
*/
public abstract class CachedRandomSearchStrategy extends RandomSearchStrategy {
String spec = "maximumSize=8192,expireAfterAccess=10m";
public CachedRandomSearchStrategy() {
}
public class CachedRandomRouter extends RandomRouter {
Cache<Key, Route> lruCache;
public class Key implements Callable<Route> {
final TransportAddress src;
final String preference;
public Key(TransportAddress src, @Nullable String preference) {
this.src = src;
this.preference = preference;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Key that = (Key) o;
if (preference != null ? !preference.equals(that.preference) : that.preference != null) return false;
if (src != null ? !src.sameHost(that.src) : that.src != null) return false;
return true;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((src == null) ? 0 : src.hashCode());
result = prime * result + ((preference == null) ? 0 : preference.hashCode());
return result;
}
@Override
public Route call() throws Exception {
return newRoute(preference, src);
}
}
public CachedRandomRouter(final String index, final String ksName, final Map<UUID, ShardRoutingState> shardStates, final ClusterState clusterState) {
super(index, ksName, shardStates, clusterState);
lruCache = CacheBuilder.from(CachedRandomSearchStrategy.this.spec).build();
}
@Override
public Route newRoute(@Nullable String preference, TransportAddress src) {
try {
Key key = newKey(src, preference);
return lruCache.get(key, key);
} catch(ExecutionException e) {
logger.warn("Unexpeceted error", e);
}
return super.newRoute(preference, src);
}
public Key newKey(TransportAddress src, @Nullable String preference) {
return new Key(src, preference);
}
}
@Override
public Router newRouter(final String index, final String ksName, final Map<UUID, ShardRoutingState> shardStates, final ClusterState clusterState) {
return new CachedRandomRouter(index, ksName, shardStates, clusterState);
}
}