Hibernate/Java EE event/messaging mechanism

I have two applications. One is a Java thick client Swing GUI for controlling some parameters which are stored in the DB. The other is a Java EE server side application which sends XML streams clients based on the parameters set by the GUI.

I would like the server side app to update its state as soon as the Swing 开发者_运维知识库GUI persists changes to the DB. What would be the best way of achieving this?

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If the thick client is updating your database directly, then you have two options:

• Use database specific event notification. Capabilities and techniques vary greatly depending on database.
• Have the server-side application poll the database looking for changes.

Assuming your thick client updates the database through a server-side application then you have multiple options depending on actual design and implementation:

• You could implement an observable pattern in your domain objects so that your server application can be notified anytime important domain objects are changed.

• If using Hibernate, you could use Hibernate interceptors and events.

• You could use a caching solution, such as Ehcache. (If you need transactional semantics, then perhaps JBoss Cache.)

• You could use shared memory solutions such as Terracotta or Hazelcast.

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What about making the Swing GUI app talk to server side app which talk to the db:

SwingGui -> ServerSideApp -> DB
Clients <-> ServerSideApp <-> DB