com.athena.sqs.MessageContext.java Source code

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Here is the source code for com.athena.sqs.MessageContext.java

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/*
 * Copyright 2012 The Athena Project
 *
 * The Athena Project licenses this file to you 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.athena.sqs;

import java.util.HashMap;
import java.util.Map;

import javax.annotation.PostConstruct;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.DependsOn;
import org.springframework.stereotype.Service;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.sqs.AmazonSQSClient;
import com.amazonaws.services.sqs.model.GetQueueUrlRequest;
import com.amazonaws.services.sqs.model.GetQueueUrlResult;

/**
 * Context class that can be use in the module globally.
 * This includes error messages and delimeter
 *
 * @author Ji-Woong Choi(ienvyou@gmail.com)
 *
 */
@Service
@DependsOn("credentials")
public class MessageContext {
    private final Logger logger = Logger.getLogger(this.getClass());

    private @Autowired BasicAWSCredentials credentials;

    public static final String HEADER_DELIMITER = "|";
    public static final String DATA_DELIMITER = "*^";

    private AmazonSQSClient sqsClient;

    private static Map<String, String> queueNameMap = new HashMap<String, String>();

    public AmazonSQSClient getSqsClient() {
        return this.sqsClient;
    }

    @PostConstruct
    public void doConnect() throws Exception {
        try {
            //AmazonSQSClient sqs = new AmazonSQSAsyncClient(credentials);
            AmazonSQSClient sqs = new AmazonSQSClient(credentials);
            sqs.setEndpoint("http://sqs.eu-west-1.amazonaws.com");

            logger.debug("Start Connection with Amazon SQS");
            this.sqsClient = sqs;
            logger.debug("Binding Amazon SQS successfully.");

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * Gets real queue url from SQS
     * @param queueName name of the queue
     * @return real queue name
     * @throws MessageException 
     */
    public String getQueue(String queueName) throws MessageException {
        String queueUrl = null;
        try {
            queueUrl = queueNameMap.get(queueName);

            if (queueUrl != null)
                return queueUrl;

            // If queue name is not exist, lookup queue.
            GetQueueUrlRequest queue = new GetQueueUrlRequest(queueName);
            GetQueueUrlResult queueResult = sqsClient.getQueueUrl(queue);
            queueUrl = queueResult.getQueueUrl();

        } catch (AmazonServiceException ase) {
            throw ase;
        } catch (AmazonClientException ace) {
            throw ace;
        }
        return queueUrl;
    }
}