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// Sample message listener program.
import java.io.IOException;
import javax.microedition.midlet.*;
import javax.microedition.io.*;
import javax.wireless.messaging.*;
public class Example extends MIDlet implements MessageListener {
MessageConnection messconn;
boolean done;
Reader reader;
// Initial tests setup and execution.
public void startApp() {
try {
// Get our receiving port connection.
messconn = (MessageConnection)
Connector.open("sms://:6222");
// Register a listener for inbound messages.
messconn.setMessageListener(this);
// Start a message-reading thread.
done = false;
reader = new Reader();
new Thread(reader).start();
} catch (IOException e) {
// Handle startup errors
}
}
// Asynchronous callback for inbound message.
public void notifyIncomingMessage(MessageConnection conn) {
if (conn == messconn) {
reader.handleMessage();
}
}
// Required MIDlet method - release the connection and
// signal the reader thread to terminate.
public void pauseApp() {
done = true;
try {
messconn.close();
} catch (IOException e) {
// Handle errors
}
}
// Required MIDlet method - shutdown.
// @param unconditional forced shutdown flag
public void destroyApp(boolean unconditional) {
done = true;
try {
messconn.setMessageListener(null);
messconn.close();
} catch (IOException e) {
// Handle shutdown errors.
}
}
// Isolate blocking I/O on a separate thread, so callback
// can return immediately.
class Reader implements Runnable {
private int pendingMessages = 0;
// The run method performs the actual message reading.
public void run() {
while (!done) {
synchronized(this) {
if (pendingMessages == 0) {
try {
wait();
} catch (Exception e) {
// Handle interruption
}
}
pendingMessages--;
}
// The benefit of the MessageListener is here.
// This thread could via similar triggers be
// handling other kind of events as well in
// addition to just receiving the messages.
try {
Message mess = messconn.receive();
} catch (IOException ioe) {
// Handle reading errors
}
}
}
public synchronized void handleMessage() {
pendingMessages++;
notify();
}
}
} |
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