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Open Source, Distributed, RESTful Search Engine
/*
* 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.single;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.action.NoShardAvailableActionException;
import org.elasticsearch.action.support.BaseAction;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.routing.ShardsIterator;
import org.elasticsearch.indices.IndicesService;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.*;
import org.elasticsearch.util.io.stream.StreamInput;
import org.elasticsearch.util.io.stream.StreamOutput;
import org.elasticsearch.util.io.stream.Streamable;
import org.elasticsearch.util.settings.Settings;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public abstract class TransportSingleOperationAction extends BaseAction {
protected final ClusterService clusterService;
protected final TransportService transportService;
protected final IndicesService indicesService;
protected final ThreadPool threadPool;
protected TransportSingleOperationAction(Settings settings, ThreadPool threadPool, ClusterService clusterService, TransportService transportService, IndicesService indicesService) {
super(settings);
this.clusterService = clusterService;
this.transportService = transportService;
this.threadPool = threadPool;
this.indicesService = indicesService;
transportService.registerHandler(transportAction(), new TransportHandler());
transportService.registerHandler(transportShardAction(), new ShardTransportHandler());
}
@Override protected void doExecute(Request request, ActionListener listener) {
new AsyncSingleAction(request, listener).start();
}
protected abstract String transportAction();
protected abstract String transportShardAction();
protected abstract Response shardOperation(Request request, int shardId) throws ElasticSearchException;
protected abstract Request newRequest();
protected abstract Response newResponse();
private class AsyncSingleAction {
private final ActionListener listener;
private final ShardsIterator shardsIt;
private final Request request;
private final DiscoveryNodes nodes;
private AsyncSingleAction(Request request, ActionListener listener) {
this.request = request;
this.listener = listener;
ClusterState clusterState = clusterService.state();
nodes = clusterState.nodes();
// update to the concrete shard to use
request.index(clusterState.metaData().concreteIndex(request.index()));
this.shardsIt = indicesService.indexServiceSafe(request.index()).operationRouting()
.getShards(clusterState, request.type(), request.id());
}
public void start() {
performFirst();
}
private void onFailure(ShardRouting shardRouting, Exception e) {
if (logger.isTraceEnabled() && e != null) {
logger.trace(shardRouting.shortSummary() + ": Failed to get [" + request.type() + "#" + request.id() + "]", e);
}
perform(e);
}
/**
* First get should try and use a shard that exists on a local node for better performance
*/
private void performFirst() {
while (shardsIt.hasNextActive()) {
final ShardRouting shard = shardsIt.nextActive();
if (shard.currentNodeId().equals(nodes.localNodeId())) {
if (request.operationThreaded()) {
threadPool.execute(new Runnable() {
@Override public void run() {
try {
Response response = shardOperation(request, shard.id());
listener.onResponse(response);
} catch (Exception e) {
onFailure(shard, e);
}
}
});
return;
} else {
try {
final Response response = shardOperation(request, shard.id());
if (request.listenerThreaded()) {
threadPool.execute(new Runnable() {
@Override public void run() {
listener.onResponse(response);
}
});
} else {
listener.onResponse(response);
}
return;
} catch (Exception e) {
onFailure(shard, e);
}
}
}
}
if (!shardsIt.hasNextActive()) {
// no local node get, go remote
shardsIt.reset();
perform(null);
}
}
private void perform(final Exception lastException) {
while (shardsIt.hasNextActive()) {
final ShardRouting shard = shardsIt.nextActive();
// no need to check for local nodes, we tried them already in performFirstGet
if (!shard.currentNodeId().equals(nodes.localNodeId())) {
DiscoveryNode node = nodes.get(shard.currentNodeId());
transportService.sendRequest(node, transportShardAction(), new ShardSingleOperationRequest(request, shard.id()), new BaseTransportResponseHandler() {
@Override public Response newInstance() {
return newResponse();
}
@Override public void handleResponse(final Response response) {
if (request.listenerThreaded()) {
threadPool.execute(new Runnable() {
@Override public void run() {
listener.onResponse(response);
}
});
} else {
listener.onResponse(response);
}
}
@Override public void handleException(RemoteTransportException exp) {
onFailure(shard, exp);
}
@Override public boolean spawn() {
// no need to spawn, we will execute the listener on a different thread if needed in handleResponse
return false;
}
});
return;
}
}
if (!shardsIt.hasNextActive()) {
Exception failure = lastException;
if (failure == null) {
failure = new NoShardAvailableActionException(shardsIt.shardId(), "No shard available for [" + request.type() + "#" + request.id() + "]");
} else {
if (logger.isDebugEnabled()) {
logger.debug(shardsIt.shardId() + ": Failed to get [" + request.type() + "#" + request.id() + "]", failure);
}
}
if (request.listenerThreaded()) {
final Exception fFailure = failure;
threadPool.execute(new Runnable() {
@Override public void run() {
listener.onFailure(fFailure);
}
});
} else {
listener.onFailure(failure);
}
}
}
}
private class TransportHandler extends BaseTransportRequestHandler {
@Override public Request newInstance() {
return newRequest();
}
@Override public void messageReceived(Request request, final TransportChannel channel) throws Exception {
// no need to have a threaded listener since we just send back a response
request.listenerThreaded(false);
// if we have a local operation, execute it on a thread since we don't spawn
request.operationThreaded(true);
execute(request, new ActionListener() {
@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 response for get", e1);
}
}
});
}
@Override public boolean spawn() {
return false;
}
}
private class ShardTransportHandler extends BaseTransportRequestHandler {
@Override public ShardSingleOperationRequest newInstance() {
return new ShardSingleOperationRequest();
}
@Override public void messageReceived(ShardSingleOperationRequest request, TransportChannel channel) throws Exception {
Response response = shardOperation(request.request(), request.shardId());
channel.sendResponse(response);
}
}
protected class ShardSingleOperationRequest implements Streamable {
private Request request;
private int shardId;
ShardSingleOperationRequest() {
}
public ShardSingleOperationRequest(Request request, int shardId) {
this.request = request;
this.shardId = shardId;
}
public Request request() {
return request;
}
public int shardId() {
return shardId;
}
@Override public void readFrom(StreamInput in) throws IOException {
request = newRequest();
request.readFrom(in);
shardId = in.readVInt();
}
@Override public void writeTo(StreamOutput out) throws IOException {
request.writeTo(out);
out.writeVInt(shardId);
}
}
}