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// Copyright (c) 2010 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 "webkit/plugins/ppapi/callbacks.h"
#include <algorithm>
#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"
namespace webkit {
namespace ppapi {
// CallbackTracker -------------------------------------------------------------
CallbackTracker::CallbackTracker() {
}
void CallbackTracker::AbortAll() {
// Iterate over a copy since |Abort()| calls |Remove()| (indirectly).
// TODO(viettrungluu): This obviously isn't so efficient.
CallbackSetMap pending_callbacks_copy = pending_callbacks_;
for (CallbackSetMap::iterator it1 = pending_callbacks_copy.begin();
it1 != pending_callbacks_copy.end(); ++it1) {
for (CallbackSet::iterator it2 = it1->second.begin();
it2 != it1->second.end(); ++it2) {
(*it2)->Abort();
}
}
}
void CallbackTracker::PostAbortForResource(PP_Resource resource_id) {
CHECK(resource_id != 0);
CallbackSetMap::iterator it1 = pending_callbacks_.find(resource_id);
if (it1 == pending_callbacks_.end())
return;
for (CallbackSet::iterator it2 = it1->second.begin();
it2 != it1->second.end(); ++it2) {
// Post the abort.
(*it2)->PostAbort();
}
}
CallbackTracker::~CallbackTracker() {
// All callbacks must be aborted before destruction.
CHECK_EQ(0u, pending_callbacks_.size());
}
void CallbackTracker::Add(
const scoped_refptr<TrackedCallback>& tracked_callback) {
PP_Resource resource_id = tracked_callback->resource_id();
DCHECK(pending_callbacks_[resource_id].find(tracked_callback) ==
pending_callbacks_[resource_id].end());
pending_callbacks_[resource_id].insert(tracked_callback);
}
void CallbackTracker::Remove(
const scoped_refptr<TrackedCallback>& tracked_callback) {
CallbackSetMap::iterator map_it =
pending_callbacks_.find(tracked_callback->resource_id());
DCHECK(map_it != pending_callbacks_.end());
CallbackSet::iterator it = map_it->second.find(tracked_callback);
DCHECK(it != map_it->second.end());
map_it->second.erase(it);
// If there are no pending callbacks left for this ID, get rid of the entry.
if (map_it->second.empty())
pending_callbacks_.erase(map_it);
}
// TrackedCallback -------------------------------------------------------------
TrackedCallback::TrackedCallback(const scoped_refptr<CallbackTracker>& tracker,
PP_Resource resource_id)
: ALLOW_THIS_IN_INITIALIZER_LIST(abort_impl_factory_(this)),
tracker_(tracker),
resource_id_(resource_id),
completed_(false),
aborted_(false) {
tracker_->Add(make_scoped_refptr(this));
}
void TrackedCallback::Abort() {
if (!completed()) {
aborted_ = true;
AbortImpl();
}
}
void TrackedCallback::PostAbort() {
if (!completed()) {
aborted_ = true;
// Post a task for the abort (only if necessary).
if (abort_impl_factory_.empty()) {
MessageLoop::current()->PostTask(
FROM_HERE,
abort_impl_factory_.NewRunnableMethod(&TrackedCallback::AbortImpl));
}
}
}
TrackedCallback::~TrackedCallback() {
// The tracker must ensure that the callback is completed (maybe abortively).
DCHECK(completed_);
}
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;
}
// TrackedCompletionCallback ---------------------------------------------------
TrackedCompletionCallback::TrackedCompletionCallback(
const scoped_refptr<CallbackTracker>& tracker,
PP_Resource resource_id,
const PP_CompletionCallback& callback)
: TrackedCallback(tracker, resource_id),
callback_(callback) {
}
void TrackedCompletionCallback::Run(int32_t result) {
if (!completed()) {
// Cancel any pending calls.
abort_impl_factory_.RevokeAll();
// 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();
PP_RunCompletionCallback(&callback, result);
}
}
void TrackedCompletionCallback::AbortImpl() {
Run(PP_ERROR_ABORTED);
}
} // namespace ppapi
} // namespace webkit
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