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| 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 #include "headless/public/util/deterministic_dispatcher.h" |
| 6 |
| 7 #include <utility> |
| 8 |
| 9 #include "base/bind.h" |
| 10 #include "base/logging.h" |
| 11 #include "headless/public/util/managed_dispatch_url_request_job.h" |
| 12 |
| 13 namespace headless { |
| 14 |
| 15 DeterministicDispatcher::DeterministicDispatcher( |
| 16 scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner) |
| 17 : io_thread_task_runner_(std::move(io_thread_task_runner)), |
| 18 dispatch_pending_(false) {} |
| 19 |
| 20 DeterministicDispatcher::~DeterministicDispatcher() {} |
| 21 |
| 22 void DeterministicDispatcher::JobCreated(ManagedDispatchURLRequestJob* job) { |
| 23 base::AutoLock lock(lock_); |
| 24 pending_requests_.push_back(job); |
| 25 } |
| 26 |
| 27 void DeterministicDispatcher::JobKilled(ManagedDispatchURLRequestJob* job) { |
| 28 base::AutoLock lock(lock_); |
| 29 for (auto it = pending_requests_.begin(); it != pending_requests_.end(); |
| 30 it++) { |
| 31 if (*it == job) { |
| 32 pending_requests_.erase(it); |
| 33 break; |
| 34 } |
| 35 } |
| 36 ready_status_map_.erase(job); |
| 37 // We rely on JobDeleted getting called to call MaybeDispatchJobLocked. |
| 38 } |
| 39 |
| 40 void DeterministicDispatcher::JobFailed(ManagedDispatchURLRequestJob* job, |
| 41 net::Error error) { |
| 42 base::AutoLock lock(lock_); |
| 43 ready_status_map_[job] = error; |
| 44 MaybeDispatchJobLocked(); |
| 45 } |
| 46 |
| 47 void DeterministicDispatcher::DataReady(ManagedDispatchURLRequestJob* job) { |
| 48 base::AutoLock lock(lock_); |
| 49 ready_status_map_[job] = net::OK; |
| 50 MaybeDispatchJobLocked(); |
| 51 } |
| 52 |
| 53 void DeterministicDispatcher::JobDeleted(ManagedDispatchURLRequestJob* job) { |
| 54 base::AutoLock lock(lock_); |
| 55 MaybeDispatchJobLocked(); |
| 56 } |
| 57 |
| 58 void DeterministicDispatcher::MaybeDispatchJobLocked() { |
| 59 if (dispatch_pending_ || ready_status_map_.empty()) |
| 60 return; |
| 61 |
| 62 dispatch_pending_ = true; |
| 63 io_thread_task_runner_->PostTask( |
| 64 FROM_HERE, |
| 65 base::Bind(&DeterministicDispatcher::MaybeDispatchJobOnIOThreadTask, |
| 66 base::Unretained(this))); |
| 67 } |
| 68 |
| 69 void DeterministicDispatcher::MaybeDispatchJobOnIOThreadTask() { |
| 70 ManagedDispatchURLRequestJob* job; |
| 71 net::Error job_status; |
| 72 |
| 73 { |
| 74 base::AutoLock lock(lock_); |
| 75 CHECK(!pending_requests_.empty()); |
| 76 dispatch_pending_ = false; |
| 77 job = pending_requests_.front(); |
| 78 StatusMap::const_iterator it = ready_status_map_.find(job); |
| 79 // Bail out if the oldest job is not be ready for dispatch yet. |
| 80 if (it == ready_status_map_.end()) |
| 81 return; |
| 82 |
| 83 job_status = it->second; |
| 84 ready_status_map_.erase(it); |
| 85 pending_requests_.pop_front(); |
| 86 } |
| 87 |
| 88 if (job_status == net::OK) { |
| 89 job->OnHeadersComplete(); |
| 90 } else { |
| 91 job->OnStartError(job_status); |
| 92 } |
| 93 } |
| 94 |
| 95 } // namespace headless |
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