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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_NAVIGATION_MONITOR_H_
#define COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_NAVIGATION_MONITOR_H_
#include "base/component_export.h"
#include "base/time/time.h"
#include "components/keyed_service/core/keyed_service.h"
namespace download {
// Enum used to describe navigation event from WebContentsObserver.
enum class NavigationEvent {
START_NAVIGATION = 0,
NAVIGATION_COMPLETE = 1,
};
// NavigationMonitor receives and forwards navigation events from any web
// contents to download service.
//
// NavigationMonitor outlives any WebContentsObserver that send navigation
// events to it.
//
// NavigationMonitor does NOT has ownership of WebContentsObserver, and is
// essentially a decoupled singleton that glues download service with
// WebContents and WebContentsObserver.
class COMPONENT_EXPORT(COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE)
NavigationMonitor : public KeyedService {
public:
// Used to propagates the navigation events.
class Observer {
public:
virtual void OnNavigationEvent() = 0;
virtual ~Observer() = default;
};
// Start to listen to navigation event.
virtual void SetObserver(NavigationMonitor::Observer* observer) = 0;
// Called when navigation events happen.
virtual void OnNavigationEvent(NavigationEvent event) = 0;
// Returns whether the system is idle or busy with navigations.
virtual bool IsNavigationInProgress() const = 0;
// Called to configure various delays used before notifying the observers.
// |navigation_completion_delay| is the amount of delay during which if there
// is no navigation activity, the system is considered to be idle.
// |navigation_timeout_delay| is the maximum timeout starting from the
// beginning of a navigation after which the navigation is considered to be
// lost so that download service can resume.
virtual void Configure(base::TimeDelta navigation_completion_delay,
base::TimeDelta navigation_timeout_delay) = 0;
protected:
~NavigationMonitor() override = default;
};
} // namespace download
#endif // COMPONENTS_DOWNLOAD_PUBLIC_BACKGROUND_SERVICE_NAVIGATION_MONITOR_H_
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