it.polimi.modaclouds.cpimlibrary.msgqueuemng.AmazonMessageQueueFactory.java Source code

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Here is the source code for it.polimi.modaclouds.cpimlibrary.msgqueuemng.AmazonMessageQueueFactory.java

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/**
 * Copyright 2013 deib-polimi
 * Contact: deib-polimi <marco.miglierina@polimi.it>
 *
 *    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 it.polimi.modaclouds.cpimlibrary.msgqueuemng;

import it.polimi.modaclouds.cpimlibrary.CloudMetadata;
import it.polimi.modaclouds.cpimlibrary.ModeQueue;
import it.polimi.modaclouds.cpimlibrary.QueueInfo;

import java.io.IOException;
import java.util.HashMap;

import com.amazonaws.auth.AWSCredentials;
import com.amazonaws.auth.PropertiesCredentials;
import com.amazonaws.services.sqs.AmazonSQSClient;

public class AmazonMessageQueueFactory extends CloudMessageQueueFactory {

    //serve salvarsi la map??? SI!!!
    private HashMap<String, AmazonMessageQueue> map = null;
    private HashMap<String, QueueInfo> info = null;

    private AmazonSQSClient sqs = null;

    //creo un SQS diverso per ogni factory??? quindi per ogni volta che lo richiamo nel provider???
    public AmazonMessageQueueFactory(CloudMetadata metadata) {
        AWSCredentials credentials = null;
        try {
            credentials = new PropertiesCredentials(
                    getClass().getClassLoader().getResourceAsStream("AwsCredentials.properties"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        this.sqs = new AmazonSQSClient(credentials);
        this.info = metadata.getQueueMedatada();
    }

    //se gia e stato creato un manager per una coda, lo restituisco; altrimenti lo creo
    @Override
    public CloudMessageQueue getQueue(String queueName) {
        queueName = queueName.toLowerCase();
        QueueInfo queueInfo = info.get(queueName);
        if (map == null) {
            map = new HashMap<String, AmazonMessageQueue>();
        }
        if (map.containsKey(queueName))
            return map.get(queueName);
        if (queueInfo.getMode().equals(ModeQueue.PULL)) {
            AmazonMessageQueue newqueue = new AmazonMessageQueue(queueName, sqs);
            map.put(queueName, newqueue);
            return newqueue;
        } else {
            return null;
        }
    }

}