Message handling in Java Platfrom, Micro Edition (Java ME)

Comments

13 Sep
2009

Article Review by vkmunjpara (20090913)

Message Handling is explained in a very easy way in this article. In this article a class MessageListenerImpl implements MessageListener.

And this interface has one method for notifying incoming message.

The Class WirelessMessageReader is used for handling of pending messages. And I also supports networking functionality.

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Article

Created: arunjyothiskp (21 Nov 2007)

Last edited: hamishwillee (06 Feb 2012)

Introduction

Sending and receiving messages are carried out by the messaging API, JSR 120. The messaging API is based on the Generic Connection Framework (GCF), which is defined in the Connected Limited Device Configuration (CLDC) 1.0 specification. The package javax.microedition.io defines the framework and supports input/output and networking functionality in J2ME profiles. It provides a coherent way to access and organize data in a resource-constrained environment.

Code Sample 1 – A simplified version of the message handling classes

class MessageListenerImpl implements MessageListener
{
	public void notifyIncomingMessage(MessageConnection mCon)
	{ 
		messageReader.handleMessage(); 
	}
}
 
class WirelessMessageReader implements Runnable
{
 
	private boolean readMessages = true;
 
	private int pendingMessages;
 
	private MessageConnection msgConn = null;
 
 
	public void run()
	{
		while(readMessages)
		{
			synchronized(this)
			{
				if(pendingMessages == 0)
				{
					try
					{ 
						wait(); 
					}
					catch(InterruptedException ie) {}
				}
				pendingMessages--;
			}
			Message message = null;
			try
			{
				Message message = msgConn.receive();
				/* parse payload */
			}
			catch(IOException ioe) {}
		}
	}
 
	synchronized void handleMessage()
	{
		pendingMessages++;
		notify();
	}
}