| // Copyright 2018 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. |
| |
| #ifndef CONTENT_BROWSER_TRACING_BACKGROUND_STARTUP_TRACING_OBSERVER_H_ |
| #define CONTENT_BROWSER_TRACING_BACKGROUND_STARTUP_TRACING_OBSERVER_H_ |
| |
| #include <memory> |
| |
| #include "content/browser/tracing/background_tracing_manager_impl.h" |
| |
| namespace content { |
| |
| // Observes for startup tracing config and sets up preferences to trace on next |
| // startup. |
| class CONTENT_EXPORT BackgroundStartupTracingObserver |
| : public BackgroundTracingManagerImpl::EnabledStateObserver { |
| public: |
| // Delegate to store and read application preferences for startup tracing, to |
| // isolate the feature for testing. |
| class PreferenceManager { |
| public: |
| virtual void SetBackgroundStartupTracingEnabled(bool enabled) = 0; |
| virtual bool GetBackgroundStartupTracingEnabled() const = 0; |
| virtual ~PreferenceManager() = default; |
| }; |
| |
| static BackgroundStartupTracingObserver* GetInstance(); |
| |
| // Returns startup tracing rule from the given config, null if doesn't exist. |
| static const BackgroundTracingRule* FindStartupRuleInConfig( |
| const BackgroundTracingConfigImpl& config); |
| |
| // BackgroundTracingManagerImpl::EnabledStateObserver implementation. |
| void OnScenarioActivated(const BackgroundTracingConfigImpl* config) override; |
| void OnScenarioAborted() override; |
| void OnTracingEnabled( |
| BackgroundTracingConfigImpl::CategoryPreset preset) override; |
| |
| // Reads the preference for startup tracing set on the previous startup and |
| // includes config for startup tracing if enabled. Also sets or resets the |
| // preference for next session based on current config containing startup |
| // rule. Returns the config after the changes. |
| std::unique_ptr<BackgroundTracingConfigImpl> IncludeStartupConfigIfNeeded( |
| std::unique_ptr<BackgroundTracingConfigImpl> config); |
| |
| // Returns true if startup tracing was set on the previous session and is |
| // active now. |
| bool enabled_in_current_session() const { |
| return enabled_in_current_session_; |
| } |
| |
| void SetPreferenceManagerForTesting( |
| std::unique_ptr<PreferenceManager> preferences); |
| |
| private: |
| BackgroundStartupTracingObserver(); |
| ~BackgroundStartupTracingObserver() override; |
| |
| bool enabled_in_current_session_; |
| |
| std::unique_ptr<PreferenceManager> preferences_; |
| |
| DISALLOW_COPY_AND_ASSIGN(BackgroundStartupTracingObserver); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_BROWSER_TRACING_BACKGROUND_STARTUP_TRACING_OBSERVER_H_ |