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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/. */
#include "StopGapEventTarget.h"
#include "nsITargetShutdownTask.h"
namespace mozilla {
NS_IMPL_ISUPPORTS(StopGapEventTarget, nsISerialEventTarget, nsIEventTarget)
StopGapEventTarget::StopGapEventTarget()
: mMutex("StopGapEventTarget::mMutex") {}
StopGapEventTarget::~StopGapEventTarget() {
MOZ_ASSERT(!mRealEventTarget || mTasks.IsEmpty(),
"mRealEventTarget is set, but mTasks has not been drained. How?");
for (auto& [event, flags] : mTasks) {
if (nsCOMPtr<nsICancelableRunnable> cancelable = do_QueryInterface(event)) {
cancelable->Cancel();
}
}
}
bool StopGapEventTarget::IsOnCurrentThreadInfallible() {
MutexAutoLock lock(mMutex);
return mRealEventTarget && mRealEventTarget->IsOnCurrentThread();
}
NS_IMETHODIMP StopGapEventTarget::IsOnCurrentThread(bool* aRetval) {
*aRetval = IsOnCurrentThreadInfallible();
return NS_OK;
}
NS_IMETHODIMP StopGapEventTarget::Dispatch(
already_AddRefed<nsIRunnable> aEvent,
nsIEventTarget::DispatchFlags aFlags) {
MutexAutoLock lock(mMutex);
if (mRealEventTarget) {
return mRealEventTarget->Dispatch(std::move(aEvent), aFlags);
}
mTasks.AppendElement(TaskStruct{std::move(aEvent), aFlags});
return NS_OK;
}
NS_IMETHODIMP StopGapEventTarget::DispatchFromScript(
nsIRunnable* aEvent, nsIEventTarget::DispatchFlags aFlags) {
nsCOMPtr<nsIRunnable> event(aEvent);
return Dispatch(event.forget(), aFlags);
}
NS_IMETHODIMP StopGapEventTarget::DelayedDispatch(
already_AddRefed<nsIRunnable> aEvent, uint32_t aDelayMs) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP StopGapEventTarget::RegisterShutdownTask(
nsITargetShutdownTask* aTask) {
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP StopGapEventTarget::UnregisterShutdownTask(
nsITargetShutdownTask* aTask) {
return NS_ERROR_NOT_IMPLEMENTED;
}
nsresult StopGapEventTarget::SetRealEventTarget(
nsISerialEventTarget* aRealEventTarget) {
nsTArray<TaskStruct> tasks;
NS_ENSURE_ARG(aRealEventTarget);
{
MutexAutoLock lock(mMutex);
if (mRealEventTarget) {
MOZ_ASSERT_UNREACHABLE(
"SetRealEventTarget cannot be called more than once.");
return NS_ERROR_ALREADY_INITIALIZED;
}
tasks = std::move(mTasks);
for (auto& task : tasks) {
nsresult rv = aRealEventTarget->Dispatch(task.event.forget(), task.flags);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
mRealEventTarget = aRealEventTarget;
}
return NS_OK;
}
} // namespace mozilla
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