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// Copyright 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 "components/webdata/common/web_data_request_manager.h"
#include <utility>
#include "base/bind.h"
#include "base/location.h"
#include "base/memory/ptr_util.h"
#include "base/profiler/scoped_tracker.h"
#include "base/stl_util.h"
#include "base/threading/thread_task_runner_handle.h"
////////////////////////////////////////////////////////////////////////////////
//
// WebDataRequest implementation.
//
////////////////////////////////////////////////////////////////////////////////
WebDataRequest::~WebDataRequest() {
WebDataRequestManager* manager = GetManager();
if (manager)
manager->CancelRequest(handle_);
}
WebDataServiceBase::Handle WebDataRequest::GetHandle() const {
return handle_;
}
bool WebDataRequest::IsActive() {
return GetManager() != nullptr;
}
WebDataRequest::WebDataRequest(WebDataRequestManager* manager,
WebDataServiceConsumer* consumer,
WebDataServiceBase::Handle handle)
: task_runner_(base::ThreadTaskRunnerHandle::Get()),
atomic_manager_(reinterpret_cast<base::subtle::AtomicWord>(manager)),
consumer_(consumer),
handle_(handle) {
DCHECK(task_runner_);
DCHECK(IsActive());
static_assert(sizeof(atomic_manager_) == sizeof(manager), "size mismatch");
}
WebDataRequestManager* WebDataRequest::GetManager() {
return reinterpret_cast<WebDataRequestManager*>(
base::subtle::Acquire_Load(&atomic_manager_));
}
WebDataServiceConsumer* WebDataRequest::GetConsumer() {
return consumer_;
}
scoped_refptr<base::SingleThreadTaskRunner> WebDataRequest::GetTaskRunner() {
return task_runner_;
}
void WebDataRequest::MarkAsInactive() {
// Set atomic_manager_ to the equivalent of nullptr;
base::subtle::Release_Store(&atomic_manager_, 0);
}
////////////////////////////////////////////////////////////////////////////////
//
// WebDataRequestManager implementation.
//
////////////////////////////////////////////////////////////////////////////////
WebDataRequestManager::WebDataRequestManager()
: next_request_handle_(1) {
}
std::unique_ptr<WebDataRequest> WebDataRequestManager::NewRequest(
WebDataServiceConsumer* consumer) {
base::AutoLock l(pending_lock_);
std::unique_ptr<WebDataRequest> request = base::WrapUnique(
new WebDataRequest(this, consumer, next_request_handle_));
bool inserted =
pending_requests_.emplace(next_request_handle_, request.get()).second;
DCHECK(inserted);
++next_request_handle_;
return request;
}
void WebDataRequestManager::CancelRequest(WebDataServiceBase::Handle h) {
base::AutoLock l(pending_lock_);
// If the request was already cancelled, or has already completed, it won't
// be in the pending_requests_ collection any more.
auto i = pending_requests_.find(h);
if (i == pending_requests_.end())
return;
i->second->MarkAsInactive();
pending_requests_.erase(i);
}
void WebDataRequestManager::RequestCompleted(
std::unique_ptr<WebDataRequest> request,
std::unique_ptr<WDTypedResult> result) {
scoped_refptr<base::SingleThreadTaskRunner> task_runner =
request->GetTaskRunner();
task_runner->PostTask(
FROM_HERE,
base::BindOnce(&WebDataRequestManager::RequestCompletedOnThread, this,
base::Passed(&request), base::Passed(&result)));
}
WebDataRequestManager::~WebDataRequestManager() {
base::AutoLock l(pending_lock_);
for (auto i = pending_requests_.begin(); i != pending_requests_.end(); ++i)
i->second->MarkAsInactive();
pending_requests_.clear();
}
void WebDataRequestManager::RequestCompletedOnThread(
std::unique_ptr<WebDataRequest> request,
std::unique_ptr<WDTypedResult> result) {
// Check whether the request is active. It might have been cancelled in
// another thread before this completion handler was invoked. This means the
// request initiator is no longer interested in the result.
if (!request->IsActive())
return;
// Stop tracking the request. The request is already finished, so "stop
// tracking" is the same as post-facto cancellation.
{
// TODO(robliao): Remove ScopedTracker below once https://crbug.com/422460
// is fixed.
tracked_objects::ScopedTracker tracking_profile(
FROM_HERE_WITH_EXPLICIT_FUNCTION(
"422460 "
"WebDataRequestManager::RequestCompletedOnThread::UpdateMap"));
CancelRequest(request->GetHandle());
}
// Notify the consumer if needed.
WebDataServiceConsumer* const consumer = request->GetConsumer();
if (consumer) {
// TODO(robliao): Remove ScopedTracker below once https://crbug.com/422460
// is fixed.
tracked_objects::ScopedTracker tracking_profile(
FROM_HERE_WITH_EXPLICIT_FUNCTION(
"422460 "
"WebDataRequestManager::RequestCompletedOnThread::NotifyConsumer"));
consumer->OnWebDataServiceRequestDone(request->GetHandle(),
std::move(result));
}
}
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