/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.action.sql.query;
import io.crate.executor.transport.DefaultTransportResponseHandler;
import io.crate.executor.transport.ResponseForwarder;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.cluster.ClusterService;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.search.query.QuerySearchResult;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.BaseTransportRequestHandler;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportService;
import java.util.concurrent.Executor;
public class TransportQueryShardAction {
private final String transportAction = "crate/sql/shard/query";
private final static String executorName = ThreadPool.Names.SEARCH;
private final ClusterService clusterService;
private final Executor executor;
private final CrateSearchService searchService;
private final TransportService transportService;
@Inject
public TransportQueryShardAction(ClusterService clusterService,
ThreadPool threadPool,
CrateSearchService searchService,
TransportService transportService) {
this.searchService = searchService;
this.transportService = transportService;
this.clusterService = clusterService;
executor = threadPool.executor(executorName);
transportService.registerHandler(transportAction, new TransportHandler());
}
public void execute(String node, QueryShardRequest request, ActionListener<QuerySearchResult> listener) {
new AsyncAction(node, request, listener).start();
}
private void shardOperation(QueryShardRequest request, ActionListener<QuerySearchResult> listener) {
try {
QuerySearchResult querySearchResult = searchService.executeQueryPhase(request);
listener.onResponse(querySearchResult);
} catch (Exception e) {
listener.onFailure(e);
}
}
private class AsyncAction {
private final String nodeId;
private final QueryShardRequest request;
private final ClusterState clusterState;
private final ActionListener<QuerySearchResult> listener;
private AsyncAction(String node, QueryShardRequest request, ActionListener<QuerySearchResult> listener) {
this.listener = listener;
clusterState = clusterService.state();
this.nodeId = node;
this.request = request;
}
public void start() {
if (nodeId.equals("_local") || nodeId.equals(clusterState.nodes().localNodeId())) {
executor.execute(new Runnable() {
@Override
public void run() {
shardOperation(request, listener);
}
});
} else {
transportService.sendRequest(
clusterState.nodes().get(nodeId),
transportAction,
request,
new DefaultTransportResponseHandler<QuerySearchResult>(listener, executorName) {
@Override
public QuerySearchResult newInstance() {
return new QuerySearchResult();
}
}
);
}
}
}
private class TransportHandler extends BaseTransportRequestHandler<QueryShardRequest> {
@Override
public QueryShardRequest newInstance() {
return new QueryShardRequest();
}
@Override
public void messageReceived(QueryShardRequest request, TransportChannel channel) throws Exception {
ActionListener<QuerySearchResult> listener = ResponseForwarder.forwardTo(channel);
shardOperation(request, listener);
}
@Override
public String executor() {
return executorName;
}
}
}