/*
* 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.client.transport.action.support;
import org.elasticsearch.ElasticSearchException;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
import org.elasticsearch.ElasticSearchIllegalStateException;
import org.elasticsearch.action.ActionFuture;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.ActionRequest;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.action.support.PlainActionFuture;
import org.elasticsearch.client.transport.action.ClientTransportAction;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.BaseTransportResponseHandler;
import org.elasticsearch.transport.TransportException;
import org.elasticsearch.transport.TransportRequestOptions;
import org.elasticsearch.transport.TransportService;
import java.lang.reflect.Constructor;
import static org.elasticsearch.action.support.PlainActionFuture.*;
/**
* @author kimchy (shay.banon)
*/
public abstract class BaseClientTransportAction<Request extends ActionRequest, Response extends ActionResponse> extends AbstractComponent implements ClientTransportAction<Request, Response> {
protected final TransportService transportService;
private final Constructor<Response> responseConstructor;
protected BaseClientTransportAction(Settings settings, TransportService transportService, Class<Response> type) {
super(settings);
this.transportService = transportService;
try {
this.responseConstructor = type.getDeclaredConstructor();
} catch (NoSuchMethodException e) {
throw new ElasticSearchIllegalArgumentException("No default constructor is declared for [" + type.getName() + "]");
}
responseConstructor.setAccessible(true);
}
@Override public ActionFuture<Response> execute(DiscoveryNode node, Request request) throws ElasticSearchException {
PlainActionFuture<Response> future = newFuture();
request.listenerThreaded(false);
execute(node, request, future);
return future;
}
@Override public void execute(DiscoveryNode node, final Request request, final ActionListener<Response> listener) {
transportService.sendRequest(node, action(), request, options(), new BaseTransportResponseHandler<Response>() {
@Override public Response newInstance() {
return BaseClientTransportAction.this.newInstance();
}
@Override public String executor() {
if (request.listenerThreaded()) {
return ThreadPool.Names.CACHED;
}
return ThreadPool.Names.SAME;
}
@Override public void handleResponse(Response response) {
listener.onResponse(response);
}
@Override public void handleException(TransportException exp) {
listener.onFailure(exp);
}
});
}
protected TransportRequestOptions options() {
return TransportRequestOptions.EMPTY;
}
protected abstract String action();
protected Response newInstance() {
try {
return responseConstructor.newInstance();
} catch (Exception e) {
throw new ElasticSearchIllegalStateException("Failed to create a new instance");
}
}
}