org.elasticsearch.action.support.TransportAction Maven / Gradle / Ivy
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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.action.*;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.concurrent.EsRejectedExecutionException;
import org.elasticsearch.threadpool.ThreadPool;
import static org.elasticsearch.action.support.PlainActionFuture.newFuture;
/**
*
*/
public abstract class TransportAction extends AbstractComponent {
protected final ThreadPool threadPool;
protected TransportAction(Settings settings, ThreadPool threadPool) {
super(settings);
this.threadPool = threadPool;
}
public ActionFuture execute(Request request) throws ElasticsearchException {
PlainActionFuture future = newFuture();
// since we don't have a listener, and we release a possible lock with the future
// there is no need to execute it under a listener thread
request.listenerThreaded(false);
execute(request, future);
return future;
}
public void execute(Request request, ActionListener listener) {
if (request.listenerThreaded()) {
listener = new ThreadedActionListener(threadPool, listener, logger);
}
ActionRequestValidationException validationException = request.validate();
if (validationException != null) {
listener.onFailure(validationException);
return;
}
try {
doExecute(request, listener);
} catch (Throwable e) {
logger.trace("Error during transport action execution.", e);
listener.onFailure(e);
}
}
protected abstract void doExecute(Request request, ActionListener listener);
static final class ThreadedActionListener implements ActionListener {
private final ThreadPool threadPool;
private final ActionListener listener;
private final ESLogger logger;
ThreadedActionListener(ThreadPool threadPool, ActionListener listener, ESLogger logger) {
this.threadPool = threadPool;
this.listener = listener;
this.logger = logger;
}
@Override
public void onResponse(final Response response) {
try {
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
try {
listener.onResponse(response);
} catch (Throwable e) {
listener.onFailure(e);
}
}
});
} catch (EsRejectedExecutionException ex) {
logger.debug("Can not run threaded action, exectuion rejected [{}] running on current thread", listener);
/* we don't care if that takes long since we are shutting down. But if we not respond somebody could wait
* for the response on the listener side which could be a remote machine so make sure we push it out there.*/
try {
listener.onResponse(response);
} catch (Throwable e) {
listener.onFailure(e);
}
}
}
@Override
public void onFailure(final Throwable e) {
try {
threadPool.generic().execute(new Runnable() {
@Override
public void run() {
listener.onFailure(e);
}
});
} catch (EsRejectedExecutionException ex) {
logger.debug("Can not run threaded action, exectuion rejected for listener [{}] running on current thread", listener);
/* we don't care if that takes long since we are shutting down. But if we not respond somebody could wait
* for the response on the listener side which could be a remote machine so make sure we push it out there.*/
listener.onFailure(e);
}
}
}
}