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| General Threading Rules |
In general, data structures in IntelliJ Platform are covered by a single "multiple readers / single writer" lock.
Reading data is allowed from any thread.
Reading data from the UI thread does not require any special effort. However, read operations performed from any other thread need to be wrapped in a read action by using ApplicationManager.getApplication().runReadAction().
Writing the data is only allowed from the UI thread, and write operations always need to be wrapped in a write action with ApplicationManager.getApplication().runWriteAction().
To pass control from a background thread to the event dispatch thread, instead of the standard SwingUtilities.invokeLater(), plugins should use ApplicationManager.getApplication().invokeLater().
The latter API allows specifying the modality state for the call, i.e. the stack of modal dialogs under which the call is allowed to execute.
Passing ModalityState.NON_MODAL means that the operation will be executed after all modal dialogs are closed. Passing ModalityState.stateForComponent() means that the operation may be executed while the specified component (part of a dialog) is still visible.