问题
In the constructor of my custom composite (inherited from SWT Composite), I register myself as an EventHandler to the Eclipse IEventBroker.
To unsubscribe upon disposal, I had overridden the dispose method where I unsubscribe myself.
But I now noticed that this unsubscription is not happening, indeed the dispose method is never getting called.
What is the correct way to unsubscribe myself, or to avoid that a closed Composite/ViewPart leaves "leaking" event handlers behind?
I use Eclipse RCP 3.x (so no annotations/injection). In E4 I could use the automatic Event subscription or the @Predestroy method, if I understood it correctly.
回答1:
Use the addDisposeListener of the Composite to add a DisposeListener and do the unsubscribe in the listener.
来源：https://stackoverflow.com/questions/30625525/eclipse-rcp-how-and-when-to-correctly-unsubscribe-a-composite-from-eventbroker