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Elasticsearch subproject :server
/*
* 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.transport;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.tasks.TaskManager;
import java.lang.reflect.Constructor;
import java.util.concurrent.Callable;
import java.io.IOException;
/**
*
*/
public class RequestHandlerRegistry {
private final String action;
private final TransportRequestHandler handler;
private final boolean forceExecution;
private final boolean canTripCircuitBreaker;
private final String executor;
private final Callable requestFactory;
private final TaskManager taskManager;
RequestHandlerRegistry(String action, Class request, TaskManager taskManager, TransportRequestHandler handler,
String executor, boolean forceExecution, boolean canTripCircuitBreaker) {
this(action, new ReflectionFactory<>(request), taskManager, handler, executor, forceExecution, canTripCircuitBreaker);
}
public RequestHandlerRegistry(String action, Callable requestFactory, TaskManager taskManager, TransportRequestHandler handler, String executor, boolean forceExecution, boolean canTripCircuitBreaker) {
this.action = action;
this.requestFactory = requestFactory;
assert newRequest() != null;
this.handler = handler;
this.forceExecution = forceExecution;
this.canTripCircuitBreaker = canTripCircuitBreaker;
this.executor = executor;
this.taskManager = taskManager;
}
public String getAction() {
return action;
}
public Request newRequest() {
try {
return requestFactory.call();
} catch (Exception e) {
throw new IllegalStateException("failed to instantiate request ", e);
}
}
public void processMessageReceived(Request request, TransportChannel channel) throws Exception {
final Task task = taskManager.register(channel.getChannelType(), action, request);
if (task == null) {
handler.messageReceived(request, channel);
} else {
boolean success = false;
try {
handler.messageReceived(request, new TransportChannelWrapper(taskManager, task, channel), task);
success = true;
} finally {
if (success == false) {
taskManager.unregister(task);
}
}
}
}
public boolean isForceExecution() {
return forceExecution;
}
public boolean canTripCircuitBreaker() {
return canTripCircuitBreaker;
}
public String getExecutor() {
return executor;
}
private final static class ReflectionFactory implements Callable {
private final Constructor requestConstructor;
public ReflectionFactory(Class request) {
try {
this.requestConstructor = request.getDeclaredConstructor();
} catch (NoSuchMethodException e) {
throw new IllegalStateException("failed to create constructor (does it have a default constructor?) for request " + request, e);
}
}
@Override
public Request call() throws Exception {
try {
return requestConstructor.newInstance();
} catch (IllegalAccessException e) {
throw new IllegalStateException("Could not access '" + requestConstructor + "'. Implementations must be a public class and have a public no-arg ctor.", e);
}
}
}
@Override
public String toString() {
return handler.toString();
}
private static class TransportChannelWrapper extends DelegatingTransportChannel {
private final Task task;
private final TaskManager taskManager;
public TransportChannelWrapper(TaskManager taskManager, Task task, TransportChannel channel) {
super(channel);
this.task = task;
this.taskManager = taskManager;
}
@Override
public void sendResponse(TransportResponse response) throws IOException {
endTask();
super.sendResponse(response);
}
@Override
public void sendResponse(TransportResponse response, TransportResponseOptions options) throws IOException {
endTask();
super.sendResponse(response, options);
}
@Override
public void sendResponse(Throwable error) throws IOException {
endTask();
super.sendResponse(error);
}
private void endTask() {
taskManager.unregister(task);
}
}
}