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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.action.ActionRequest;
import org.elasticsearch.action.ActionResponse;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportChannel;
import org.elasticsearch.transport.TransportRequestHandler;
import org.elasticsearch.transport.TransportService;

/**
 * A TransportAction that self registers a handler into the transport service
 */
public abstract class HandledTransportAction
        extends TransportAction {

    protected HandledTransportAction(String actionName, TransportService transportService,
                                     ActionFilters actionFilters, Writeable.Reader requestReader) {
        this(actionName, true, transportService, actionFilters, requestReader);
    }

    protected HandledTransportAction(String actionName, TransportService transportService,
                                     ActionFilters actionFilters, Writeable.Reader requestReader, String executor) {
        this(actionName, true, transportService, actionFilters, requestReader, executor);
    }

    protected HandledTransportAction(String actionName, boolean canTripCircuitBreaker,
                                     TransportService transportService, ActionFilters actionFilters,
                                     Writeable.Reader requestReader) {
        this(actionName, canTripCircuitBreaker, transportService, actionFilters, requestReader, ThreadPool.Names.SAME);
    }

    protected HandledTransportAction(String actionName, boolean canTripCircuitBreaker,
                                     TransportService transportService, ActionFilters actionFilters,
                                     Writeable.Reader requestReader, String executor) {
        super(actionName, actionFilters, transportService.getTaskManager());
        transportService.registerRequestHandler(actionName, executor, false, canTripCircuitBreaker, requestReader,
            new TransportHandler());
    }

    class TransportHandler implements TransportRequestHandler {
        @Override
        public final void messageReceived(final Request request, final TransportChannel channel, Task task) {
            // We already got the task created on the network layer - no need to create it again on the transport layer
            execute(task, request, new ChannelActionListener<>(channel, actionName, request));
        }
    }

}