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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ppapi/shared_impl/tracked_callback.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/shared_impl/callback_tracker.h"
#include "ppapi/shared_impl/ppapi_globals.h"
#include "ppapi/shared_impl/proxy_lock.h"
#include "ppapi/shared_impl/resource.h"
namespace ppapi {
// TrackedCallback -------------------------------------------------------------
// Note: don't keep a Resource* since it may go out of scope before us.
TrackedCallback::TrackedCallback(
Resource* resource,
const PP_CompletionCallback& callback)
: ALLOW_THIS_IN_INITIALIZER_LIST(abort_impl_factory_(this)),
resource_id_(resource->pp_resource()),
completed_(false),
aborted_(false),
callback_(callback) {
tracker_ = PpapiGlobals::Get()->GetCallbackTrackerForInstance(
resource->pp_instance()),
tracker_->Add(make_scoped_refptr(this));
}
TrackedCallback::~TrackedCallback() {
}
void TrackedCallback::Abort() {
if (!completed()) {
aborted_ = true;
Run(PP_ERROR_ABORTED);
}
}
void TrackedCallback::PostAbort() {
if (!completed()) {
aborted_ = true;
// Post a task for the abort (only if necessary).
if (!abort_impl_factory_.HasWeakPtrs()) {
MessageLoop::current()->PostTask(
FROM_HERE,
RunWhileLocked(base::Bind(&TrackedCallback::Abort,
abort_impl_factory_.GetWeakPtr())));
}
}
}
void TrackedCallback::Run(int32_t result) {
if (!completed()) {
// Cancel any pending calls.
abort_impl_factory_.InvalidateWeakPtrs();
// Copy |callback_| and look at |aborted()| now, since |MarkAsCompleted()|
// may delete us.
PP_CompletionCallback callback = callback_;
if (aborted())
result = PP_ERROR_ABORTED;
// Do this before running the callback in case of reentrancy (which
// shouldn't happen, but avoid strange failures).
MarkAsCompleted();
CallWhileUnlocked(PP_RunCompletionCallback, &callback, result);
}
}
// static
bool TrackedCallback::IsPending(
const scoped_refptr<TrackedCallback>& callback) {
if (!callback.get())
return false;
return !callback->completed();
}
// static
void TrackedCallback::ClearAndRun(scoped_refptr<TrackedCallback>* callback,
int32_t result) {
scoped_refptr<TrackedCallback> temp;
temp.swap(*callback);
temp->Run(result);
}
// static
void TrackedCallback::ClearAndAbort(scoped_refptr<TrackedCallback>* callback) {
scoped_refptr<TrackedCallback> temp;
temp.swap(*callback);
temp->Abort();
}
void TrackedCallback::MarkAsCompleted() {
DCHECK(!completed());
// We will be removed; maintain a reference to ensure we won't be deleted
// until we're done.
scoped_refptr<TrackedCallback> thiz = this;
completed_ = true;
tracker_->Remove(thiz);
tracker_ = NULL;
}
} // namespace ppapi
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