Push Based Mechanism

[mkarthik90]

Is there any method or API available in Java for pushing the data from the server without request being passed from the client.
For example if any updation made at the database it needs to be passed to the client without a request frm the client. (snooze)

[Norm]

How will the server get the client's IP address?
How will the client know that it has data to read if it doesn't request the data?

You could have the client open a ServerSocket and wait on that for a connection from the server.

[Norm]

Cross posted at Push Based Mechanism

[mkarthik90]

i thought of using the DWR - Easy Ajax for JAVA
and when the data is changed in the database triggers can be generated which in turn calls the servlet and i am not sure how to push the data from server to client. I am just a beginner in java please help me out.

[Norm]

Is there an open connection between the server and the client? Has the client already connected to the server?
If not, how can the server connect to the client?