| // 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. |
| |
| #include "headless/public/util/deterministic_dispatcher.h" |
| |
| #include <utility> |
| |
| #include "base/bind.h" |
| #include "base/logging.h" |
| #include "headless/public/util/managed_dispatch_url_request_job.h" |
| |
| namespace headless { |
| |
| DeterministicDispatcher::DeterministicDispatcher( |
| scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner) |
| : io_thread_task_runner_(std::move(io_thread_task_runner)), |
| dispatch_pending_(false) {} |
| |
| DeterministicDispatcher::~DeterministicDispatcher() {} |
| |
| void DeterministicDispatcher::JobCreated(ManagedDispatchURLRequestJob* job) { |
| base::AutoLock lock(lock_); |
| pending_requests_.push_back(job); |
| } |
| |
| void DeterministicDispatcher::JobKilled(ManagedDispatchURLRequestJob* job) { |
| base::AutoLock lock(lock_); |
| for (auto it = pending_requests_.begin(); it != pending_requests_.end(); |
| it++) { |
| if (*it == job) { |
| pending_requests_.erase(it); |
| break; |
| } |
| } |
| ready_status_map_.erase(job); |
| // We rely on JobDeleted getting called to call MaybeDispatchJobLocked. |
| } |
| |
| void DeterministicDispatcher::JobFailed(ManagedDispatchURLRequestJob* job, |
| net::Error error) { |
| base::AutoLock lock(lock_); |
| ready_status_map_[job] = error; |
| MaybeDispatchJobLocked(); |
| } |
| |
| void DeterministicDispatcher::DataReady(ManagedDispatchURLRequestJob* job) { |
| base::AutoLock lock(lock_); |
| ready_status_map_[job] = net::OK; |
| MaybeDispatchJobLocked(); |
| } |
| |
| void DeterministicDispatcher::JobDeleted(ManagedDispatchURLRequestJob* job) { |
| base::AutoLock lock(lock_); |
| MaybeDispatchJobLocked(); |
| } |
| |
| void DeterministicDispatcher::MaybeDispatchJobLocked() { |
| if (dispatch_pending_ || ready_status_map_.empty()) |
| return; |
| |
| dispatch_pending_ = true; |
| io_thread_task_runner_->PostTask( |
| FROM_HERE, |
| base::Bind(&DeterministicDispatcher::MaybeDispatchJobOnIOThreadTask, |
| base::Unretained(this))); |
| } |
| |
| void DeterministicDispatcher::MaybeDispatchJobOnIOThreadTask() { |
| ManagedDispatchURLRequestJob* job; |
| net::Error job_status; |
| |
| { |
| base::AutoLock lock(lock_); |
| CHECK(!pending_requests_.empty()); |
| dispatch_pending_ = false; |
| job = pending_requests_.front(); |
| StatusMap::const_iterator it = ready_status_map_.find(job); |
| // Bail out if the oldest job is not be ready for dispatch yet. |
| if (it == ready_status_map_.end()) |
| return; |
| |
| job_status = it->second; |
| ready_status_map_.erase(it); |
| pending_requests_.pop_front(); |
| } |
| |
| if (job_status == net::OK) { |
| job->OnHeadersComplete(); |
| } else { |
| job->OnStartError(job_status); |
| } |
| } |
| |
| } // namespace headless |