EchoMessageProcessor.java

/*
 * Copyright (c) 2017, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. 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.wso2.carbon.transport.http.netty.contentaware;

import io.netty.handler.codec.http.HttpHeaders;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wso2.carbon.messaging.CarbonCallback;
import org.wso2.carbon.messaging.CarbonMessage;
import org.wso2.carbon.messaging.CarbonMessageProcessor;
import org.wso2.carbon.messaging.ClientConnector;
import org.wso2.carbon.messaging.DefaultCarbonMessage;
import org.wso2.carbon.messaging.TransportSender;
import org.wso2.carbon.transport.http.netty.common.Constants;

import java.nio.ByteBuffer;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * A Message processor which echos the incoming message
 */
public class EchoMessageProcessor implements CarbonMessageProcessor {
    private static final Logger logger = LoggerFactory.getLogger(EchoMessageProcessor.class);

    private ClientConnector clientConnector;

    private ExecutorService executor = Executors.newSingleThreadExecutor();

    @Override
    public boolean receive(CarbonMessage carbonMessage, CarbonCallback carbonCallback) throws Exception {
        executor.execute(new Runnable() {
            @Override
            public void run() {
                if (carbonMessage.getProperty(org.wso2.carbon.messaging.Constants.DIRECTION) != null && carbonMessage
                        .getProperty(org.wso2.carbon.messaging.Constants.DIRECTION)
                        .equals(org.wso2.carbon.messaging.Constants.DIRECTION_RESPONSE)) {

                    carbonCallback.done(carbonMessage);
                } else {
                    int length = carbonMessage.getFullMessageLength();
                    List<ByteBuffer> fullMessage = carbonMessage.getFullMessageBody();
                    ByteBuffer byteBuffer = ByteBuffer.allocate(length);
                    fullMessage.forEach(buffer -> byteBuffer.put(buffer));
                    CarbonMessage cMsg = new DefaultCarbonMessage();
                    cMsg.setHeader(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.KEEP_ALIVE);
                    cMsg.setHeader(HttpHeaders.Names.CONTENT_LENGTH, String.valueOf(length));
                    cMsg.setHeader(HttpHeaders.Names.CONTENT_TYPE, Constants.TEXT_PLAIN);
                    cMsg.setProperty(Constants.HTTP_STATUS_CODE, 200);
                    byteBuffer.flip();
                    cMsg.addMessageBody(byteBuffer);
                    cMsg.setEndOfMsgAdded(true);
                    carbonCallback.done(cMsg);
                }

            }
        });
        return false;
    }

    @Override
    public void setTransportSender(TransportSender transportSender) {
    }

    @Override
    public void setClientConnector(ClientConnector clientConnector) {
        this.clientConnector = clientConnector;
    }

    @Override
    public String getId() {
        return "message-echo-processor";
    }
}