com.kiribuki.queueservice.QueueService.java Source code

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Here is the source code for com.kiribuki.queueservice.QueueService.java

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package com.kiribuki.queueservice;

/*
* Copyright 2010-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
*  http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.
*/
import java.util.List;
//import java.util.Map.Entry;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.auth.ClasspathPropertiesFileCredentialsProvider;
import com.amazonaws.regions.Region;
import com.amazonaws.regions.Regions;
import com.amazonaws.services.sqs.AmazonSQS;
import com.amazonaws.services.sqs.AmazonSQSClient;
import com.amazonaws.services.sqs.model.CreateQueueRequest;
import com.amazonaws.services.sqs.model.DeleteMessageRequest;
//import com.amazonaws.services.sqs.model.DeleteQueueRequest;
import com.amazonaws.services.sqs.model.Message;
import com.amazonaws.services.sqs.model.ReceiveMessageRequest;
import com.amazonaws.services.sqs.model.SendMessageRequest;

//import com.amazonaws.services.sqs.model.GetQueueUrlRequest;

public class QueueService {

    private boolean swok = false;
    private AmazonSQS sqs = new AmazonSQSClient(new ClasspathPropertiesFileCredentialsProvider());
    private String myQueueUrl = "";

    /*
     * Constructor de la clase: nos abrir una connexin con el servicio de colas de Amazom.
     * Si hay alguna excepcin cargaremos la variable swok a false, para no poer operar con el objeto
     */
    public QueueService() throws Exception {
        Region euWest1 = Region.getRegion(Regions.EU_WEST_1);
        try {
            sqs.setRegion(euWest1);
            swok = true;
        } catch (Exception e) {
            swok = false;
        }
    }

    /*
     *  Funcin que utilizaremos para crear una cola en el servicio de colas de Amazon.
     *  Como parmetro necesitamos el nombre de la cola a crear en el servicio de colas de Amazon
     */
    public boolean CreateQueue(String QueueName) {
        if (swok == true) {
            try {
                CreateQueueRequest createQueueRequest = new CreateQueueRequest(QueueName);
                myQueueUrl = sqs.createQueue(createQueueRequest).getQueueUrl();
                return true;
            } catch (AmazonClientException ace) {
                System.out.println("Caught an AmazonClientException, which means the client encountered "
                        + "a serious internal problem while trying to communicate with SQS, such as not "
                        + "being able to access the network.");
                System.out.println("Error Message: " + ace.getMessage());
                swok = false;
            }
        } else {
            System.out.println("NO ESTA OK L'OBJECTE");
            swok = false;
        }
        return swok;
    }

    /*
     * Funcin para enviar un mensage a la cola
     */
    public boolean SendMessage(String message) {
        if (swok == true) {
            try {
                sqs.sendMessage(new SendMessageRequest(myQueueUrl, message));
                swok = true;
            } catch (AmazonServiceException ase) {
                System.out.println("Caught an AmazonServiceException, which means your request made it "
                        + "to Amazon SQS, but was rejected with an error response for some reason.");
                System.out.println("Error Message:    " + ase.getMessage());
                System.out.println("HTTP Status Code: " + ase.getStatusCode());
                System.out.println("AWS Error Code:   " + ase.getErrorCode());
                System.out.println("Error Type:       " + ase.getErrorType());
                swok = false;
            }
        }
        return swok;
    }

    //Funcin que recibe mensajes de la cola
    private Message ReceiveMessage() {
        // Recepci de mensajes
        Message newmessage = null;
        ReceiveMessageRequest receiveMessageRequest = new ReceiveMessageRequest(myQueueUrl);
        List<Message> messages = sqs.receiveMessage(receiveMessageRequest).getMessages();

        for (Message message : messages) {
            //System.out.println("  Message");
            //System.out.println("    MessageId:     " + message.getMessageId());
            //System.out.println("    ReceiptHandle: " + message.getReceiptHandle());
            //System.out.println("    MD5OfBody:     " + message.getMD5OfBody());
            //System.out.println("    Body:          " + message.getBody());
            newmessage = message;
        }

        return newmessage;
    }

    private void DeleteMessage(String MessageHandle) {
        sqs.deleteMessage(new DeleteMessageRequest(myQueueUrl, MessageHandle));
    }

    public String ReceiveDeleteMessage() {
        Message newmessage = ReceiveMessage();
        DeleteMessage(newmessage.getReceiptHandle());
        return newmessage.getBody();
    }

    /*
     * Funcin para leer si el Objeto esta Ok o no
     */
    public boolean QueueServiceOk() {
        return swok;
    }
}