amazon sqs BasicQueue - Java AWS

Java examples for AWS:Simple Queue Service

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Description

amazon sqs BasicQueue

Demo Code

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

import com.amazonaws.auth.PropertiesCredentials;
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.GetQueueAttributesRequest;
import com.amazonaws.services.sqs.model.GetQueueAttributesResult;
import com.amazonaws.services.sqs.model.Message;
import com.amazonaws.services.sqs.model.ReceiveMessageRequest;
import com.amazonaws.services.sqs.model.SendMessageRequest;

public class BasicQueue {

    public static void main(String[] args) throws IOException,
            InterruptedException {

        AmazonSQS sqs = new AmazonSQSClient(new PropertiesCredentials(
                SimpleQueueServiceSample.class
                        .getResourceAsStream("AwsCredentials.properties")));

        //Build a map of attributes to set visibility timeout to 20 seconds
        Map<String, String> attr = new HashMap<String, String>();

        //Set Message visibility to 20 seconds.
        attr.put("VisibilityTimeout", "20");

        //Build queue request
        CreateQueueRequest createQueueRequest = new CreateQueueRequest(
                "OurQueue").withAttributes(attr).withQueueName(
                "LorenTestQueue");

        String myQueueUrl = sqs.createQueue(createQueueRequest)
                .getQueueUrl();/*from w  w  w  . j  a v a  2  s. c  o  m*/

        System.out.println("Sending message 1.");
        sqs.sendMessage(new SendMessageRequest(myQueueUrl, "First message."));

        System.out.println("Receiving messages:");
        List<Message> messages = checkPrintMessages(myQueueUrl, sqs);

        System.out.println("Deleting message.");
        String messageRecieptHandle = messages.get(0).getReceiptHandle();
        sqs.deleteMessage(new DeleteMessageRequest(myQueueUrl,
                messageRecieptHandle));

        System.out.println("Sending message 2.");
        sqs.sendMessage(new SendMessageRequest(myQueueUrl,
                "Second message."));

        System.out.println("Checking message 2 for the first time:");
        checkPrintMessages(myQueueUrl, sqs);

        System.out.println("Waiting 30 seconds....");
        Thread.sleep(30000);

        System.out.println("Checking message 2s:");
        checkPrintMessages(myQueueUrl, sqs);

        System.out.println("Sending more messages.");
        sqs.sendMessage(new SendMessageRequest(myQueueUrl, "Third message."));
        sqs.sendMessage(new SendMessageRequest(myQueueUrl,
                "Fourth message."));

        System.out.println("Fetching queue attributes:");
        GetQueueAttributesRequest getQARequest = new GetQueueAttributesRequest()
                .withQueueUrl(myQueueUrl).withAttributeNames("All");
        GetQueueAttributesResult getQAResult = sqs
                .getQueueAttributes(getQARequest);
        Map<String, String> attributeMap = getQAResult.getAttributes();
        for (String key : attributeMap.keySet()) {
            System.out.print(key + " : ");
            System.out.println(attributeMap.get(key));
        }

        System.out.println("Deleting queue.");
        sqs.deleteQueue(new DeleteQueueRequest(myQueueUrl));

    }

    public static List<Message> checkPrintMessages(String myQueueUrl,
            AmazonSQS sqs) {
        ReceiveMessageRequest receiveMessageRequest = new ReceiveMessageRequest(
                myQueueUrl);
        List<Message> messages = sqs.receiveMessage(receiveMessageRequest)
                .getMessages();
        for (Message message : messages) {
            System.out.print(message.getMessageId());
            System.out.println(" : " + message.getBody());
        }
        return messages;
    }
}

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