com.jbrisbin.vpc.jobsched.mapred.ReplyClosure.java Source code

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Here is the source code for com.jbrisbin.vpc.jobsched.mapred.ReplyClosure.java

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/*
 * Copyright 2010 by J. Brisbin <jon@jbrisbin.com>
 *
 * Licensed 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 com.jbrisbin.vpc.jobsched.mapred;

import groovy.lang.Closure;
import org.codehaus.jackson.map.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageCreator;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.core.RabbitMessageProperties;
import org.springframework.amqp.rabbit.core.RabbitTemplate;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * @author Jon Brisbin <jon@jbrisbin.com>
 */
@SuppressWarnings({ "unchecked" })
public class ReplyClosure extends Closure {

    private final Logger log = LoggerFactory.getLogger(getClass());

    private RabbitTemplate rabbitTemplate;
    private ObjectMapper mapper = new ObjectMapper();

    public ReplyClosure(Object owner) {
        super(owner);
    }

    public RabbitTemplate getRabbitTemplate() {
        return rabbitTemplate;
    }

    public void setRabbitTemplate(RabbitTemplate rabbitTemplate) {
        this.rabbitTemplate = rabbitTemplate;
    }

    @Override
    public Object call(final Object obj) {
        log.debug("obj: " + obj);
        String replyTo = (String) getProperty("replyTo");
        if (null != replyTo) {
            rabbitTemplate.send("", replyTo, new MessageCreator() {
                public Message createMessage() {
                    MessageProperties props = new RabbitMessageProperties();
                    props.setContentType("application/json");
                    props.setCorrelationId(getProperty("id").toString().getBytes());
                    ByteArrayOutputStream out = new ByteArrayOutputStream();
                    try {
                        mapper.writeValue(out, obj);
                    } catch (IOException e) {
                        log.error(e.getMessage(), e);
                    }
                    Message msg = new Message(out.toByteArray(), props);
                    if (log.isDebugEnabled()) {
                        log.debug("Sending reply: " + msg);
                    }
                    return msg;
                }
            });
        } else {
            log.warn("Reply requested, but replyTo was null!");
        }
        return null;
    }
}