| // 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" |
| #include "headless/public/util/navigation_request.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), |
| navigation_in_progress_(false), |
| weak_ptr_factory_(this) {} |
| |
| DeterministicDispatcher::~DeterministicDispatcher() {} |
| |
| void DeterministicDispatcher::JobCreated(ManagedDispatchURLRequestJob* job) { |
| base::AutoLock lock(lock_); |
| pending_requests_.emplace_back(job); |
| } |
| |
| void DeterministicDispatcher::JobKilled(ManagedDispatchURLRequestJob* job) { |
| base::AutoLock lock(lock_); |
| for (auto it = pending_requests_.begin(); it != pending_requests_.end(); |
| it++) { |
| if (it->url_request == 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::NavigationRequested( |
| std::unique_ptr<NavigationRequest> navigation) { |
| base::AutoLock lock(lock_); |
| pending_requests_.emplace_back(std::move(navigation)); |
| |
| MaybeDispatchJobLocked(); |
| } |
| |
| void DeterministicDispatcher::MaybeDispatchJobLocked() { |
| if (dispatch_pending_ || navigation_in_progress_) |
| return; |
| |
| if (ready_status_map_.empty()) { |
| if (pending_requests_.empty()) |
| return; // Nothing to do. |
| |
| // Don't post a task if the first job is a url request (which isn't ready |
| // yet). |
| if (pending_requests_.front().url_request) |
| return; |
| } |
| |
| dispatch_pending_ = true; |
| io_thread_task_runner_->PostTask( |
| FROM_HERE, |
| base::Bind(&DeterministicDispatcher::MaybeDispatchJobOnIOThreadTask, |
| weak_ptr_factory_.GetWeakPtr())); |
| } |
| |
| void DeterministicDispatcher::MaybeDispatchJobOnIOThreadTask() { |
| Request request; |
| net::Error job_status; |
| |
| { |
| base::AutoLock lock(lock_); |
| dispatch_pending_ = false; |
| // If the job got deleted, |pending_requests_| may be empty. |
| if (pending_requests_.empty()) |
| return; |
| |
| // Bail out if we're waiting for a navigation to complete. |
| if (navigation_in_progress_) |
| return; |
| |
| request = std::move(pending_requests_.front()); |
| if (request.url_request) { |
| StatusMap::const_iterator it = |
| ready_status_map_.find(request.url_request); |
| // 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); |
| } else { |
| DCHECK(!navigation_in_progress_); |
| navigation_in_progress_ = true; |
| } |
| pending_requests_.pop_front(); |
| } |
| |
| if (request.url_request) { |
| if (job_status == net::OK) { |
| request.url_request->OnHeadersComplete(); |
| } else { |
| request.url_request->OnStartError(job_status); |
| } |
| } else { |
| request.navigation_request->StartProcessing( |
| base::Bind(&DeterministicDispatcher::NavigationDoneTask, |
| weak_ptr_factory_.GetWeakPtr())); |
| } |
| } |
| |
| void DeterministicDispatcher::NavigationDoneTask() { |
| { |
| base::AutoLock lock(lock_); |
| DCHECK(navigation_in_progress_); |
| navigation_in_progress_ = false; |
| } |
| |
| MaybeDispatchJobLocked(); |
| } |
| |
| DeterministicDispatcher::Request::Request() : url_request(nullptr) {} |
| DeterministicDispatcher::Request::~Request() {} |
| |
| DeterministicDispatcher::Request::Request( |
| ManagedDispatchURLRequestJob* url_request) |
| : url_request(url_request) {} |
| |
| DeterministicDispatcher::Request::Request( |
| std::unique_ptr<NavigationRequest> navigation_request) |
| : url_request(nullptr), navigation_request(std::move(navigation_request)) {} |
| |
| DeterministicDispatcher::Request& DeterministicDispatcher::Request::operator=( |
| DeterministicDispatcher::Request&& other) { |
| url_request = other.url_request; |
| navigation_request = std::move(other.navigation_request); |
| return *this; |
| } |
| |
| } // namespace headless |