| // 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/core/snapshot_controller.h" |
| |
| #include "base/bind.h" |
| #include "base/location.h" |
| #include "base/logging.h" |
| #include "base/time/time.h" |
| #include "components/offline_pages/core/offline_page_feature.h" |
| |
| namespace { |
| // Default delay, in milliseconds, between the main document parsed event and |
| // snapshot. Note: this snapshot might not occur if the OnLoad event and |
| // OnLoad delay elapses first to trigger a final snapshot. |
| const int64_t kDefaultDelayAfterDocumentAvailableMs = 7000; |
| |
| // Default delay, in milliseconds, between the main document OnLoad event and |
| // snapshot. |
| const int64_t kDelayAfterDocumentOnLoadCompletedMsForeground = 1000; |
| |
| // Delay for testing to keep polling times reasonable. |
| const int64_t kDelayForTests = 0; |
| |
| } // 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), |
| delay_after_document_available_ms_(kDefaultDelayAfterDocumentAvailableMs), |
| delay_after_document_on_load_completed_ms_( |
| kDelayAfterDocumentOnLoadCompletedMsForeground), |
| weak_ptr_factory_(this) { |
| if (offline_pages::ShouldUseTestingSnapshotDelay()) { |
| delay_after_document_available_ms_ = kDelayForTests; |
| delay_after_document_on_load_completed_ms_ = kDelayForTests; |
| } |
| } |
| |
| SnapshotController::~SnapshotController() {} |
| |
| void SnapshotController::Reset() { |
| // Cancel potentially delayed tasks that relate to the previous 'session'. |
| weak_ptr_factory_.InvalidateWeakPtrs(); |
| state_ = State::READY; |
| current_page_quality_ = PageQuality::POOR; |
| } |
| |
| 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() { |
| DCHECK_EQ(PageQuality::POOR, current_page_quality_); |
| // Post a delayed task to snapshot. |
| task_runner_->PostDelayedTask( |
| FROM_HERE, |
| base::BindOnce(&SnapshotController::MaybeStartSnapshot, |
| weak_ptr_factory_.GetWeakPtr(), |
| PageQuality::FAIR_AND_IMPROVING), |
| base::TimeDelta::FromMilliseconds(delay_after_document_available_ms_)); |
| } |
| |
| void SnapshotController::DocumentOnLoadCompletedInMainFrame() { |
| // Post a delayed task to snapshot and then stop this controller. |
| task_runner_->PostDelayedTask( |
| FROM_HERE, |
| base::BindOnce(&SnapshotController::MaybeStartSnapshotThenStop, |
| weak_ptr_factory_.GetWeakPtr()), |
| base::TimeDelta::FromMilliseconds( |
| delay_after_document_on_load_completed_ms_)); |
| } |
| |
| void SnapshotController::MaybeStartSnapshot(PageQuality updated_page_quality) { |
| if (state_ != State::READY) |
| return; |
| DCHECK_LT(current_page_quality_, updated_page_quality); |
| current_page_quality_ = updated_page_quality; |
| state_ = State::SNAPSHOT_PENDING; |
| client_->StartSnapshot(); |
| } |
| |
| void SnapshotController::MaybeStartSnapshotThenStop() { |
| MaybeStartSnapshot(PageQuality::HIGH); |
| Stop(); |
| } |
| |
| int64_t SnapshotController::GetDelayAfterDocumentAvailableForTest() { |
| return delay_after_document_available_ms_; |
| } |
| |
| int64_t SnapshotController::GetDelayAfterDocumentOnLoadCompletedForTest() { |
| return delay_after_document_on_load_completed_ms_; |
| } |
| |
| } // namespace offline_pages |