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// Copyright 2016 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.
#ifndef HEADLESS_PUBLIC_UTIL_DETERMINISTIC_DISPATCHER_H_
#define HEADLESS_PUBLIC_UTIL_DETERMINISTIC_DISPATCHER_H_
#include <deque>
#include <map>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/lock.h"
#include "headless/public/headless_export.h"
#include "headless/public/util/url_request_dispatcher.h"
#include "net/base/net_errors.h"
namespace headless {
class ManagedDispatchURLRequestJob;
// The purpose of this class is to queue up navigations and calls to
// OnHeadersComplete / OnStartError and dispatch them in order of creation. This
// helps make renders deterministic at the cost of slower page loads.
class HEADLESS_EXPORT DeterministicDispatcher : public URLRequestDispatcher {
public:
explicit DeterministicDispatcher(
scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner);
~DeterministicDispatcher() override;
// UrlRequestDispatcher implementation:
void JobCreated(ManagedDispatchURLRequestJob* job) override;
void JobKilled(ManagedDispatchURLRequestJob* job) override;
void JobFailed(ManagedDispatchURLRequestJob* job, net::Error error) override;
void DataReady(ManagedDispatchURLRequestJob* job) override;
void JobDeleted(ManagedDispatchURLRequestJob* job) override;
void NavigationRequested(
std::unique_ptr<NavigationRequest> navigation_request) override;
private:
void MaybeDispatchNavigationJobLocked();
void MaybeDispatchJobLocked();
void MaybeDispatchJobOnIOThreadTask();
void NavigationDoneTask();
scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_;
// Protects all members below.
base::Lock lock_;
// TODO(alexclarke): Use std::variant when c++17 is allowed in chromium.
struct Request {
Request();
explicit Request(ManagedDispatchURLRequestJob* url_request);
explicit Request(std::unique_ptr<NavigationRequest> navigation_request);
~Request();
Request& operator=(Request&& other);
ManagedDispatchURLRequestJob* url_request; // NOT OWNED
std::unique_ptr<NavigationRequest> navigation_request;
};
std::deque<Request> pending_requests_;
using StatusMap = std::map<ManagedDispatchURLRequestJob*, net::Error>;
StatusMap ready_status_map_;
// Whether or not a MaybeDispatchJobOnIoThreadTask has been posted on the
// |io_thread_task_runner_|
bool dispatch_pending_;
bool navigation_in_progress_;
base::WeakPtrFactory<DeterministicDispatcher> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(DeterministicDispatcher);
};
} // namespace headless
#endif // HEADLESS_PUBLIC_UTIL_DETERMINISTIC_DISPATCHER_H_
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