| // Copyright (c) 2011 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 COMPONENTS_VISITEDLINK_BROWSER_VISITEDLINK_EVENT_LISTENER_H_ |
| #define COMPONENTS_VISITEDLINK_BROWSER_VISITEDLINK_EVENT_LISTENER_H_ |
| |
| #include <map> |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "base/memory/read_only_shared_memory_region.h" |
| #include "base/timer/timer.h" |
| #include "components/visitedlink/browser/visitedlink_master.h" |
| #include "content/public/browser/notification_observer.h" |
| #include "content/public/browser/notification_registrar.h" |
| |
| namespace content { |
| class BrowserContext; |
| } |
| |
| namespace visitedlink { |
| |
| class VisitedLinkUpdater; |
| |
| // VisitedLinkEventListener broadcasts link coloring database updates to all |
| // processes. It also coalesces the updates to avoid excessive broadcasting of |
| // messages to the renderers. |
| class VisitedLinkEventListener : public VisitedLinkMaster::Listener, |
| public content::NotificationObserver { |
| public: |
| explicit VisitedLinkEventListener(content::BrowserContext* browser_context); |
| ~VisitedLinkEventListener() override; |
| |
| void NewTable(base::ReadOnlySharedMemoryRegion* table_region) override; |
| void Add(VisitedLinkMaster::Fingerprint fingerprint) override; |
| void Reset(bool invalidate_hashes) override; |
| |
| // Sets a custom timer to use for coalescing events for testing. |
| // |coalesce_timer_override| must outlive this. |
| void SetCoalesceTimerForTest(base::OneShotTimer* coalesce_timer_override); |
| |
| private: |
| void CommitVisitedLinks(); |
| |
| // content::NotificationObserver implementation. |
| void Observe(int type, |
| const content::NotificationSource& source, |
| const content::NotificationDetails& details) override; |
| |
| // The default Timer to use for coalescing events. This should not be used |
| // directly to allow overriding it in tests. Instead, |coalesce_timer_| |
| // should be used. |
| base::OneShotTimer default_coalesce_timer_; |
| // A pointer to either |default_coalesce_timer_| or to an override set using |
| // SetCoalesceTimerForTest(). This does not own the timer. |
| base::OneShotTimer* coalesce_timer_; |
| VisitedLinkCommon::Fingerprints pending_visited_links_; |
| |
| content::NotificationRegistrar registrar_; |
| |
| // Map between renderer child ids and their VisitedLinkUpdater. |
| typedef std::map<int, std::unique_ptr<VisitedLinkUpdater>> Updaters; |
| Updaters updaters_; |
| |
| base::ReadOnlySharedMemoryRegion table_region_; |
| |
| // Used to filter RENDERER_PROCESS_CREATED notifications to renderers that |
| // belong to this BrowserContext. |
| content::BrowserContext* browser_context_; |
| |
| DISALLOW_COPY_AND_ASSIGN(VisitedLinkEventListener); |
| }; |
| |
| } // namespace visitedlink |
| |
| #endif // COMPONENTS_VISITEDLINK_BROWSER_VISITEDLINK_EVENT_LISTENER_H_ |