Listener
The listener , in French ear-phone , is an English term used in a general way in Informatique to qualify an element Logiciel which is with the listening of events in order to carry out treatments.
One distinguishes in particular:
- ear-phones of the data-processing waiters;
- ear-phones in event-driven Programming
Ear-phones of ports
In the field of the data-processing networks, the waiters carry out software which is put at the listening of customers on a port given who connect themselves to it. In phase of production, this type of program is typically carried out as a service (or a demon under system Unix) in order to treat an event (to receive data for example).
One finds the concept of ear-phone in many software, such as Web server (Apache, IIS), mail servers or DBMS (Oracle, MySql…), of the waiters ftp etc
Ear-phones in event-driven programming
The concept of ear-phone is also used in-house in a Logiciel pursuant to the Paradigme of event-driven Programmation. The ear-phone indicates the part of the software which is on standby of an event started in addition.
A traditional example is a click of mouse of the user on a button of a Graphical interface. When that occurs, an event is started and the ear-phones awaiting this type of events react by posting for example a message to the user.
One finds the mechanism of the ear-phones in the languages supporting the event-driven programming, like C++, Java…
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