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Interruptions from the serial port

Carlos PQ

Joined: May 07, 2003
Posts: 8
Im programming an app in Java with a Modem in the serial port.
I already know how to make the app read the messages that the modem sends. Ive also created a thread that after some time, it wakes up and looks if there are messages in the serial port.
BUT, I would be interested in generate an interruption (or an exception, i dont know which is the best choice) that would wake my thread up when there is an incomming message in the serial port from the modem.
That is, the app is asleep (there is no CPU time), and when the Modem sends a message to the serial port, the app would wake up automatically (the interruption will execute a method in the app, or would wake up a thread... i dont know)
Somebody could help me???
Really thank you!
Michael Morris
Ranch Hand

Joined: Jan 30, 2002
Posts: 3451
Hi Carlos,
Welcome to JavaRanch. This sounds like a job for the Observer pattern. If you have your class that reads the modem extend Observable and the Runnable (thread) that checks for messages implement Observable, then you can have the thread wait() until a message becomes available. For example:

[ June 12, 2003: Message edited by: Michael Morris ]

Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction. - Ernst F. Schumacher
I agree. Here's the link:
subject: Interruptions from the serial port
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