InboundMessageRetriever.java

package oneapi.retriever;

import java.util.List;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import oneapi.client.impl.SMSMessagingClientImpl;
import oneapi.exception.RequestException;
import oneapi.listener.InboundMessageListener;
import oneapi.model.common.InboundSMSMessageList;


 public class InboundMessageRetriever {
	private ScheduledExecutorService fScheduler;


	public void start(long interval, SMSMessagingClientImpl smsMessagingImpl) {
		this.stop();

		if (interval <= 0)
			return;

		fScheduler = Executors.newScheduledThreadPool(1);

		// fire first inbound sms pull attempt after 2 sec and then each interval milliseconds
		Runnable poller = new PollerTask(smsMessagingImpl);
		fScheduler.scheduleWithFixedDelay(poller, 2000, interval, TimeUnit.MILLISECONDS);
	}

	public void stop() {
		if (fScheduler != null) {
			fScheduler.shutdown();
		}
	}

	private static final class PollerTask implements Runnable {
		private SMSMessagingClientImpl smsMessagingImpl;
	
		public PollerTask(SMSMessagingClientImpl smsMessagingImpl) {
			this.smsMessagingImpl = smsMessagingImpl;		
		}
		public void run() {	
			List<InboundMessageListener> inboundMsglisteners = this.smsMessagingImpl.getInboundMessagePullListeners();

			if ((inboundMsglisteners != null) && (inboundMsglisteners.size() > 0)) {
				// use pull method to gather incoming messages
				InboundSMSMessageList smsMessageList = new InboundSMSMessageList();
				Throwable error = null;
				try {
					smsMessageList = smsMessagingImpl.getInboundMessages();
				} catch (RequestException e) {
					error = e.getCause();
				}												
				
				if ((smsMessageList != null && smsMessageList.getInboundSMSMessage() != null && smsMessageList.getInboundSMSMessage().length > 0) || (error != null)) {
					this.fireMessageRetrieved(smsMessageList, inboundMsglisteners, error);	
				}		
			}
		}
	
		private void fireMessageRetrieved(InboundSMSMessageList smsMessageList, List<InboundMessageListener> listeners, Throwable error) {
			for (InboundMessageListener listener : listeners) {
				listener.onMessageRetrieved(smsMessageList, error);
			}
		}
	}
}