Wednesday, September 28, 2011

EDT and non-EDT delegating to each other

This is a very common swing pattern, so better recognize it. Both techniques are often necessary rather than nice-to-have. Every swing developer needs to master them.

X) a regular thread often passes Runnable tasks to EDT via the event queue. See invokeAndWait() etc.

Y) EDT often passes slow tasks to helper threads so as to keep the GUI responsive. Tasks running on EDT should be quick. For road hogs, EDT can use a thread pool, or SwingWorker thread.

Q: data sharing? Race conditions?
A: I feel most swing apps are ok. The jcomponent objects are effectively singletons, accessible from multiple threads, but usually updated on EDT only.

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