/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.action.support.replication;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.action.support.BaseAction;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.routing.GroupShardsIterator;
import org.elasticsearch.cluster.routing.ShardIterator;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.BaseTransportRequestHandler;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportService;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceArray;
/**
* @author kimchy (shay.banon)
*/
public abstract class TransportIndexReplicationOperationAction<Request extends IndexReplicationOperationRequest, Response extends ActionResponse, ShardRequest extends ShardReplicationOperationRequest, ShardResponse extends ActionResponse>
extends BaseAction<Request, Response> {
protected final ClusterService clusterService;
protected final TransportShardReplicationOperationAction<ShardRequest, ShardResponse> shardAction;
@Inject public TransportIndexReplicationOperationAction(Settings settings, TransportService transportService, ClusterService clusterService, ThreadPool threadPool,
TransportShardReplicationOperationAction<ShardRequest, ShardResponse> shardAction) {
super(settings, threadPool);
this.clusterService = clusterService;
this.shardAction = shardAction;
transportService.registerHandler(transportAction(), new TransportHandler());
}
@Override protected void doExecute(final Request request, final ActionListener<Response> listener) {
ClusterState clusterState = clusterService.state();
// update to concrete index
request.index(clusterState.metaData().concreteIndex(request.index()));
checkBlock(request, clusterState);
GroupShardsIterator groups;
try {
groups = shards(request);
} catch (Exception e) {
listener.onFailure(e);
return;
}
final AtomicInteger indexCounter = new AtomicInteger();
final AtomicInteger completionCounter = new AtomicInteger(groups.size());
final AtomicReferenceArray<Object> shardsResponses = new AtomicReferenceArray<Object>(groups.size());
for (final ShardIterator shardIt : groups) {
ShardRequest shardRequest = newShardRequestInstance(request, shardIt.shardId().id());
// TODO for now, we fork operations on shardIt of the index
shardRequest.beforeLocalFork(); // optimize for local fork
shardRequest.operationThreaded(true);
// no need for threaded listener, we will fork when its done based on the index request
shardRequest.listenerThreaded(false);
shardAction.execute(shardRequest, new ActionListener<ShardResponse>() {
@Override public void onResponse(ShardResponse result) {
shardsResponses.set(indexCounter.getAndIncrement(), result);
if (completionCounter.decrementAndGet() == 0) {
listener.onResponse(newResponseInstance(request, shardsResponses));
}
}
@Override public void onFailure(Throwable e) {
int index = indexCounter.getAndIncrement();
if (accumulateExceptions()) {
shardsResponses.set(index, e);
}
if (completionCounter.decrementAndGet() == 0) {
listener.onResponse(newResponseInstance(request, shardsResponses));
}
}
});
}
}
protected abstract Request newRequestInstance();
protected abstract Response newResponseInstance(Request request, AtomicReferenceArray shardsResponses);
protected abstract String transportAction();
protected abstract GroupShardsIterator shards(Request request) throws ElasticSearchException;
protected abstract ShardRequest newShardRequestInstance(Request request, int shardId);
protected abstract boolean accumulateExceptions();
protected void checkBlock(Request request, ClusterState state) {
}
private class TransportHandler extends BaseTransportRequestHandler<Request> {
@Override public Request newInstance() {
return newRequestInstance();
}
@Override public String executor() {
return ThreadPool.Names.SAME;
}
@Override public void messageReceived(final Request request, final TransportChannel channel) throws Exception {
// no need to use threaded listener, since we just send a response
request.listenerThreaded(false);
execute(request, new ActionListener<Response>() {
@Override public void onResponse(Response result) {
try {
channel.sendResponse(result);
} catch (Exception e) {
onFailure(e);
}
}
@Override public void onFailure(Throwable e) {
try {
channel.sendResponse(e);
} catch (Exception e1) {
logger.warn("Failed to send error response for action [" + transportAction() + "] and request [" + request + "]", e1);
}
}
});
}
}
}