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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_BaseHistory_h
+#define mozilla_BaseHistory_h
+
+#include "IHistory.h"
+#include "mozilla/dom/ContentParent.h"
+#include "nsTHashSet.h"
+
+/* A base class for history implementations that implement link coloring. */
+
+namespace mozilla {
+
+class BaseHistory : public IHistory {
+ public:
+ void RegisterVisitedCallback(nsIURI*, dom::Link*) final;
+ void ScheduleVisitedQuery(nsIURI*, dom::ContentParent*) final;
+ void UnregisterVisitedCallback(nsIURI*, dom::Link*) final;
+ void NotifyVisited(nsIURI*, VisitedStatus,
+ const ContentParentSet* = nullptr) final;
+
+ // Some URIs like data-uris are never going to be stored in history, so we can
+ // avoid doing IPC roundtrips for them or what not.
+ static bool CanStore(nsIURI*);
+
+ protected:
+ void NotifyVisitedInThisProcess(nsIURI*, VisitedStatus);
+ void NotifyVisitedFromParent(nsIURI*, VisitedStatus, const ContentParentSet*);
+ static constexpr const size_t kTrackedUrisInitialSize = 64;
+
+ BaseHistory();
+ ~BaseHistory();
+
+ using ObserverArray = nsTObserverArray<dom::Link*>;
+ struct ObservingLinks {
+ ObserverArray mLinks;
+ VisitedStatus mStatus = VisitedStatus::Unknown;
+
+ size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
+ return mLinks.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ }
+ };
+
+ using PendingVisitedQueries = nsTHashMap<nsURIHashKey, ContentParentSet>;
+ struct PendingVisitedResult {
+ dom::VisitedQueryResult mResult;
+ ContentParentSet mProcessesToNotify;
+ };
+ using PendingVisitedResults = nsTArray<PendingVisitedResult>;
+
+ // Starts all the queries in the pending queries list, potentially at the same
+ // time.
+ virtual void StartPendingVisitedQueries(PendingVisitedQueries&&) = 0;
+
+ private:
+ // Cancels a visited query, if it is at all possible, because we know we won't
+ // use the results anymore.
+ void CancelVisitedQueryIfPossible(nsIURI*);
+
+ void SendPendingVisitedResultsToChildProcesses();
+
+ protected:
+ // A map from URI to links that depend on that URI, and whether that URI is
+ // known-to-be-visited-or-unvisited already.
+ nsTHashMap<nsURIHashKey, ObservingLinks> mTrackedURIs;
+
+ private:
+ // The set of pending URIs that we haven't queried yet but need to.
+ PendingVisitedQueries mPendingQueries;
+ // The set of pending query results that we still haven't dispatched to child
+ // processes.
+ PendingVisitedResults mPendingResults;
+ // Whether we've successfully scheduled a runnable to call
+ // StartPendingVisitedQueries already.
+ bool mStartPendingVisitedQueriesScheduled = false;
+ // Whether we've successfully scheduled a runnable to call
+ // SendPendingVisitedResultsToChildProcesses already.
+ bool mStartPendingResultsScheduled = false;
+};
+
+} // namespace mozilla
+
+#endif