mirror of
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136 lines
5.3 KiB
Plaintext
136 lines
5.3 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsIThread.idl"
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interface nsIRunnable;
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interface nsIThreadObserver;
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/**
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* The XPCOM thread object implements this interface, which allows a consumer
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* to observe dispatch activity on the thread.
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*/
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[scriptable, uuid(9cc51754-2eb3-4b46-ae99-38a61881c622)]
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interface nsIThreadInternal : nsIThread
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{
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/**
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* Get/set the current thread observer (may be null). This attribute may be
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* read from any thread, but must only be set on the thread corresponding to
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* this thread object. The observer will be released on the thread
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* corresponding to this thread object after all other events have been
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* processed during a call to Shutdown.
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*/
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attribute nsIThreadObserver observer;
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/**
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* Add an observer that will *only* receive onProcessNextEvent,
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* beforeProcessNextEvent. and afterProcessNextEvent callbacks. Always called
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* on the target thread, and the implementation does not have to be
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* threadsafe. Order of callbacks is not guaranteed (i.e.
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* afterProcessNextEvent may be called first depending on whether or not the
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* observer is added in a nested loop). Holds a strong ref.
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*/
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void addObserver(in nsIThreadObserver observer);
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/**
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* Remove an observer added via the addObserver call. Once removed the
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* observer will never be called again by the thread.
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*/
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void removeObserver(in nsIThreadObserver observer);
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/**
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* This method causes any events currently enqueued on the thread to be
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* suppressed until PopEventQueue is called, and any event dispatched to this
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* thread's nsIEventTarget will queue as well. Calls to PushEventQueue may be
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* nested and must each be paired with a call to PopEventQueue in order to
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* restore the original state of the thread. The returned nsIEventTarget may
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* be used to push events onto the nested queue. Dispatching will be disabled
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* once the event queue is popped. The thread will only ever process pending
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* events for the innermost event queue. Must only be called on the target
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* thread.
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*/
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[noscript] nsIEventTarget pushEventQueue();
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/**
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* Revert a call to PushEventQueue. When an event queue is popped, any events
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* remaining in the queue are appended to the elder queue. This also causes
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* the nsIEventTarget returned from PushEventQueue to stop dispatching events.
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* Must only be called on the target thread, and with the innermost event
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* queue.
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*/
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[noscript] void popEventQueue(in nsIEventTarget aInnermostTarget);
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};
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/**
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* This interface provides the observer with hooks to implement a layered
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* event queue. For example, it is possible to overlay processing events
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* for a GUI toolkit on top of the events for a thread:
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*
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* var NativeQueue;
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* Observer = {
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* onDispatchedEvent(thread) {
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* NativeQueue.signal();
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* }
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* onProcessNextEvent(thread, mayWait) {
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* if (NativeQueue.hasNextEvent())
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* NativeQueue.processNextEvent();
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* while (mayWait && !thread.hasPendingEvent()) {
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* NativeQueue.wait();
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* NativeQueue.processNextEvent();
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* }
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* }
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* };
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*
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* NOTE: The implementation of this interface must be threadsafe.
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*
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* NOTE: It is valid to change the thread's observer during a call to an
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* observer method.
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*
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* NOTE: Will be split into two interfaces soon: one for onProcessNextEvent and
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* afterProcessNextEvent, then another that inherits the first and adds
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* onDispatchedEvent.
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*/
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[uuid(cc8da053-1776-44c2-9199-b5a629d0a19d)]
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interface nsIThreadObserver : nsISupports
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{
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/**
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* This method is called after an event has been dispatched to the thread.
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* This method may be called from any thread.
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*
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* @param thread
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* The thread where the event is being dispatched.
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*/
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void onDispatchedEvent(in nsIThreadInternal thread);
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/**
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* This method is called when nsIThread::ProcessNextEvent is called. It does
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* not guarantee that an event is actually going to be processed. This method
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* is only called on the target thread.
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*
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* @param thread
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* The thread being asked to process another event.
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* @param mayWait
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* Indicates whether or not the method is allowed to block the calling
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* thread. For example, this parameter is false during thread shutdown.
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*/
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void onProcessNextEvent(in nsIThreadInternal thread, in boolean mayWait);
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/**
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* This method is called (from nsIThread::ProcessNextEvent) after an event
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* is processed. It does not guarantee that an event was actually processed
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* (depends on the value of |eventWasProcessed|. This method is only called
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* on the target thread. DO NOT EVER RUN SCRIPT FROM THIS CALLBACK!!!
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*
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* @param thread
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* The thread that processed another event.
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* @param eventWasProcessed
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* Indicates whether an event was actually processed. May be false if the
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* |mayWait| flag was false when calling nsIThread::ProcessNextEvent().
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*/
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void afterProcessNextEvent(in nsIThreadInternal thread,
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in bool eventWasProcessed);
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};
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