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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_StopGapEventTarget_h
#define mozilla_StopGapEventTarget_h
#include "nsISerialEventTarget.h"
#include "nsCOMPtr.h"
#include "nsISupports.h"
#include "nsTArray.h"
#include "mozilla/Mutex.h"
#include "mozilla/Queue.h"
namespace mozilla {
// This is an event target that buffers events until a "real" event target is
// connected to it. This is for situations where events must be dispatched, but
// we don't know *where* yet.
// Note: GetCurrentSerialEventTarget and friends will return the *real* event
// target for tasks that are dispatched to this.
class StopGapEventTarget final : public nsISerialEventTarget {
public:
StopGapEventTarget();
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIEVENTTARGET_FULL
// Call this when you know the real event target. Dispatches all queued
// events right away, and passes subsequent events straight through.
nsresult SetRealEventTarget(nsISerialEventTarget* aRealEventTarget);
private:
virtual ~StopGapEventTarget();
typedef struct TaskStruct {
nsCOMPtr<nsIRunnable> event;
nsIEventTarget::DispatchFlags flags;
} TaskStruct;
Mutex mMutex;
nsCOMPtr<nsISerialEventTarget> mRealEventTarget MOZ_GUARDED_BY(mMutex);
nsTArray<TaskStruct> mTasks MOZ_GUARDED_BY(mMutex);
};
} // namespace mozilla
#endif // mozilla_StopGapEventTarget_h
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