Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* 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 java.util.concurrent.atomic.AtomicInteger;
import static org.elasticsearch.action.support.PlainActionFuture.newFuture;
/**
*
*/
public abstract class TransportAction extends AbstractComponent {
protected final ThreadPool threadPool;
protected final String actionName;
private final ActionFilter[] filters;
protected TransportAction(Settings settings, String actionName, ThreadPool threadPool, ActionFilters actionFilters) {
super(settings);
this.actionName = actionName;
this.filters = actionFilters.filters();
this.threadPool = threadPool;
}
public final 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 final void execute(Request request, ActionListener listener) {
if (forceThreadedListener()) {
request.listenerThreaded(true);
}
if (request.listenerThreaded()) {
listener = new ThreadedActionListener<>(threadPool, listener, logger);
}
ActionRequestValidationException validationException = request.validate();
if (validationException != null) {
listener.onFailure(validationException);
return;
}
if (filters.length == 0) {
try {
doExecute(request, listener);
} catch(Throwable t) {
logger.trace("Error during transport action execution.", t);
listener.onFailure(t);
}
} else {
RequestFilterChain requestFilterChain = new RequestFilterChain<>(this, logger);
requestFilterChain.proceed(actionName, request, listener);
}
}
protected boolean forceThreadedListener() {
return false;
}
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.executor(ThreadPool.Names.LISTENER).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, execution 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.executor(ThreadPool.Names.LISTENER).execute(new Runnable() {
@Override
public void run() {
listener.onFailure(e);
}
});
} catch (EsRejectedExecutionException ex) {
logger.debug("Can not run threaded action, execution rejected for listener [{}] running on current thread", listener);
/* we don't care if that takes long since we are shutting down (or queue capacity). 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);
}
}
}
private static class RequestFilterChain implements ActionFilterChain {
private final TransportAction action;
private final AtomicInteger index = new AtomicInteger();
private final ESLogger logger;
private RequestFilterChain(TransportAction action, ESLogger logger) {
this.action = action;
this.logger = logger;
}
@Override @SuppressWarnings("unchecked")
public void proceed(String actionName, ActionRequest request, ActionListener listener) {
int i = index.getAndIncrement();
try {
if (i < this.action.filters.length) {
this.action.filters[i].apply(actionName, request, listener, this);
} else if (i == this.action.filters.length) {
this.action.doExecute((Request) request, new FilteredActionListener(actionName, listener, new ResponseFilterChain(this.action.filters, logger)));
} else {
listener.onFailure(new IllegalStateException("proceed was called too many times"));
}
} catch(Throwable t) {
logger.trace("Error during transport action execution.", t);
listener.onFailure(t);
}
}
@Override
public void proceed(String action, ActionResponse response, ActionListener listener) {
assert false : "request filter chain should never be called on the response side";
}
}
private static class ResponseFilterChain implements ActionFilterChain {
private final ActionFilter[] filters;
private final AtomicInteger index;
private final ESLogger logger;
private ResponseFilterChain(ActionFilter[] filters, ESLogger logger) {
this.filters = filters;
this.index = new AtomicInteger(filters.length);
this.logger = logger;
}
@Override
public void proceed(String action, ActionRequest request, ActionListener listener) {
assert false : "response filter chain should never be called on the request side";
}
@Override @SuppressWarnings("unchecked")
public void proceed(String action, ActionResponse response, ActionListener listener) {
int i = index.decrementAndGet();
try {
if (i >= 0) {
filters[i].apply(action, response, listener, this);
} else if (i == -1) {
listener.onResponse(response);
} else {
listener.onFailure(new IllegalStateException("proceed was called too many times"));
}
} catch (Throwable t) {
logger.trace("Error during transport action execution.", t);
listener.onFailure(t);
}
}
}
private static class FilteredActionListener implements ActionListener {
private final String actionName;
private final ActionListener listener;
private final ResponseFilterChain chain;
private FilteredActionListener(String actionName, ActionListener listener, ResponseFilterChain chain) {
this.actionName = actionName;
this.listener = listener;
this.chain = chain;
}
@Override
public void onResponse(Response response) {
chain.proceed(actionName, response, listener);
}
@Override
public void onFailure(Throwable e) {
listener.onFailure(e);
}
}
}
