IIScCampusMapGETProcessor.java

package se252.jan15.calvinandhobbes.project0;

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.amazonaws.services.sqs.AmazonSQS;
import com.amazonaws.services.sqs.model.DeleteMessageRequest;
import com.amazonaws.services.sqs.model.Message;
import com.amazonaws.services.sqs.model.ReceiveMessageRequest;
import com.amazonaws.services.sqs.model.SendMessageRequest;
import com.amazonaws.util.json.JSONArray;
import com.amazonaws.util.json.JSONException;

class WorkerThread implements Runnable {
    private String category;
    
    public WorkerThread(String _category){
        category = _category;
    }
 
    @Override
    public void run() {
    	LayerInfo[] layers = IIScCampusMapSDB_GETService.getCategoryData(category);
    	AmazonSQS queueClient = Queues.getQueue();
    	String obj = "{}";
		try {
			if(layers != null)
				obj = new JSONArray(layers).toString();
		} catch (JSONException e) {
			e.printStackTrace();
		}
    	obj = category + "$" + obj;
    	queueClient.sendMessage(new SendMessageRequest(Queues.resp, obj));
    }
 
    @Override
    public String toString(){
        return this.category;
    }
}

public class IIScCampusMapGETProcessor {
	private static int nThreads = 15;
	public static void main(String[] args) {
		ExecutorService executor = Executors.newFixedThreadPool(nThreads);
		Queues.initQueues();
		SDBConn.initSDB();
		AmazonSQS queueClient = Queues.getQueue();
		System.out.println("GET Processor started with "+nThreads+" threads");
		while(true) {
			ReceiveMessageRequest receiveReq = new ReceiveMessageRequest(Queues.req);
        	receiveReq.setWaitTimeSeconds(10);
        	List<Message> messages = queueClient.receiveMessage(receiveReq).getMessages();
        	for (Message message : messages) {
        		String category = message.getBody();
        		Runnable worker = new WorkerThread(category);
        		queueClient.deleteMessage(new DeleteMessageRequest(Queues.req, message.getReceiptHandle()));
        		executor.execute(worker);
        	}
		}
	}

}