| // 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 "components/offline_pages/snapshot_controller.h" |
| |
| #include "base/bind.h" |
| #include "base/location.h" |
| #include "base/logging.h" |
| #include "base/time/time.h" |
| |
| namespace { |
| // Delay, in milliseconds, between the main document parsed event and snapshot. |
| // Note if the "load" event fires before this delay is up, then the snapshot |
| // is taken immediately. |
| const size_t kDelayAfterDocumentAvailable = 7000; |
| |
| } // namespace |
| |
| namespace offline_pages { |
| |
| SnapshotController::SnapshotController( |
| const scoped_refptr<base::SingleThreadTaskRunner>& task_runner, |
| SnapshotController::Client* client) |
| : task_runner_(task_runner), |
| client_(client), |
| state_(State::READY), |
| weak_ptr_factory_(this) { |
| } |
| |
| SnapshotController::~SnapshotController() {} |
| |
| void SnapshotController::Reset() { |
| // Cancel potentially delayed tasks that relate to the previous 'session'. |
| weak_ptr_factory_.InvalidateWeakPtrs(); |
| state_ = State::READY; |
| } |
| |
| void SnapshotController::Stop() { |
| state_ = State::STOPPED; |
| } |
| |
| void SnapshotController::PendingSnapshotCompleted() { |
| // Unless the controller is "stopped", enable the subsequent snapshots. |
| // Stopped state prevents any further snapshots form being started. |
| if (state_ == State::STOPPED) |
| return; |
| state_ = State::READY; |
| } |
| |
| void SnapshotController::DocumentAvailableInMainFrame() { |
| // Post a delayed task. The snapshot will happen either when the delay |
| // is up, or if the "load" event is dispatched in the main frame. |
| task_runner_->PostDelayedTask( |
| FROM_HERE, |
| base::Bind(&SnapshotController::MaybeStartSnapshot, |
| weak_ptr_factory_.GetWeakPtr()), |
| base::TimeDelta::FromMilliseconds(kDelayAfterDocumentAvailable)); |
| } |
| |
| void SnapshotController::DocumentOnLoadCompletedInMainFrame() { |
| MaybeStartSnapshot(); |
| // No more snapshots after onLoad (there still can be other events |
| // or delayed tasks that can try to start another snapshot) |
| Stop(); |
| } |
| |
| void SnapshotController::MaybeStartSnapshot() { |
| if (state_ != State::READY) |
| return; |
| state_ = State::SNAPSHOT_PENDING; |
| client_->StartSnapshot(); |
| } |
| |
| size_t SnapshotController::GetDelayAfterDocumentAvailableForTest() { |
| return kDelayAfterDocumentAvailable; |
| } |
| |
| |
| } // namespace offline_pages |