org.springframework.amqp.rabbit.log4j.listener.AmqpLogMessageConverter.java Source code

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Here is the source code for org.springframework.amqp.rabbit.log4j.listener.AmqpLogMessageConverter.java

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/*
 * Copyright 2002-2010 the original author or authors.
 * 
 * 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 org.springframework.amqp.rabbit.log4j.listener;

import java.util.Date;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageProperties;
import org.springframework.amqp.rabbit.log4j.AmqpAppender;
import org.springframework.amqp.support.converter.AbstractMessageConverter;
import org.springframework.amqp.support.converter.MessageConversionException;
import org.springframework.util.CollectionUtils;

/**
 * @author tomas.lukosius@opencredo.com
 * 
 */
public class AmqpLogMessageConverter extends AbstractMessageConverter {
    private static Log log = LogFactory.getLog(AmqpLogMessageConverter.class);

    /*
     * (non-Javadoc)
     * 
     * @see org.springframework.amqp.support.converter.AbstractMessageConverter#createMessage(java.lang.Object,
     * org.springframework.amqp.core.MessageProperties)
     */
    @Override
    protected Message createMessage(Object object, MessageProperties messageProperties) {
        throw new UnsupportedOperationException("Conversion from object to amqp logs message not supported");
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * org.springframework.amqp.support.converter.AbstractMessageConverter#fromMessage(org.springframework.amqp.core
     * .Message)
     */
    @Override
    public Object fromMessage(Message message) throws MessageConversionException {
        AmqpLogMessage content = null;
        MessageProperties properties = message.getMessageProperties();
        if (properties != null) {
            String applicationId = properties.getAppId();
            Date timestamp = properties.getTimestamp();
            Map<String, Object> headers = properties.getHeaders();

            if (CollectionUtils.isEmpty(headers)) {
                log.warn("Retrieved log message properties should contain headers");
                return null;
            }

            if (!headers.containsKey(AmqpAppender.CATEGORY_NAME)) {
                log.warn(AmqpAppender.CATEGORY_NAME + " - is expected in log message properties headers");
                return null;
            }

            if (!headers.containsKey(AmqpAppender.CATEGORY_LEVEL)) {
                log.warn(AmqpAppender.CATEGORY_LEVEL + " - is expected in log message properties headers");
                return null;
            }

            String logger = (String) headers.get(AmqpAppender.CATEGORY_NAME);
            String level = (String) headers.get(AmqpAppender.CATEGORY_LEVEL);

            content = new AmqpLogMessage(logger, level, new String(message.getBody()), timestamp.getTime(),
                    applicationId);
        } else {
            log.warn("Retrieved log message should contain properties");
        }

        return content;
    }

}