OLD | NEW |
(Empty) | |
| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef HEADLESS_PUBLIC_UTIL_DETERMINISTIC_DISPATCHER_H_ |
| 6 #define HEADLESS_PUBLIC_UTIL_DETERMINISTIC_DISPATCHER_H_ |
| 7 |
| 8 #include <deque> |
| 9 #include <map> |
| 10 |
| 11 #include "base/macros.h" |
| 12 #include "base/memory/ref_counted.h" |
| 13 #include "base/single_thread_task_runner.h" |
| 14 #include "base/synchronization/lock.h" |
| 15 #include "headless/public/util/url_request_dispatcher.h" |
| 16 #include "net/base/net_errors.h" |
| 17 |
| 18 namespace headless { |
| 19 |
| 20 class ManagedDispatchURLRequestJob; |
| 21 |
| 22 // The purpose of this class is to queue up calls to OnHeadersComplete and |
| 23 // OnStartError and dispatch them in order of URLRequestJob creation. This |
| 24 // helps make renders deterministic at the cost of slower page loads. |
| 25 class DeterministicDispatcher : public URLRequestDispatcher { |
| 26 public: |
| 27 explicit DeterministicDispatcher( |
| 28 scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner); |
| 29 |
| 30 ~DeterministicDispatcher() override; |
| 31 |
| 32 // UrlRequestDispatcher implementation: |
| 33 void JobCreated(ManagedDispatchURLRequestJob* job) override; |
| 34 void JobKilled(ManagedDispatchURLRequestJob* job) override; |
| 35 void JobFailed(ManagedDispatchURLRequestJob* job, net::Error error) override; |
| 36 void DataReady(ManagedDispatchURLRequestJob* job) override; |
| 37 void JobDeleted(ManagedDispatchURLRequestJob* job) override; |
| 38 |
| 39 private: |
| 40 void MaybeDispatchJobLocked(); |
| 41 void MaybeDispatchJobOnIOThreadTask(); |
| 42 |
| 43 scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner_; |
| 44 |
| 45 // Protects all members below. |
| 46 base::Lock lock_; |
| 47 |
| 48 std::deque<ManagedDispatchURLRequestJob*> pending_requests_; |
| 49 |
| 50 using StatusMap = std::map<ManagedDispatchURLRequestJob*, net::Error>; |
| 51 StatusMap ready_status_map_; |
| 52 |
| 53 // Whether or not a MaybeDispatchJobOnIoThreadTask has been posted on the |
| 54 // |io_thread_task_runner_| |
| 55 bool dispatch_pending_; |
| 56 |
| 57 DISALLOW_COPY_AND_ASSIGN(DeterministicDispatcher); |
| 58 }; |
| 59 |
| 60 } // namespace headless |
| 61 |
| 62 #endif // HEADLESS_PUBLIC_UTIL_DETERMINISTIC_DISPATCHER_H_ |
OLD | NEW |