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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.
#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 = net::ERR_FAILED;
{
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
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