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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 */
#ifndef mozilla_BaseHistory_h
#define mozilla_BaseHistory_h
#include "IHistory.h"
#include "mozilla/dom/ContentParent.h"
/* A base class for history implementations that implement link coloring. */
namespace mozilla {
class BaseHistory : public IHistory {
void RegisterVisitedCallback(nsIURI*, dom::Link*) final;
void UnregisterVisitedCallback(nsIURI*, dom::Link*) final;
void NotifyVisited(nsIURI*, VisitedStatus) 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*);
void NotifyVisitedInThisProcess(nsIURI*, VisitedStatus);
void NotifyVisitedFromParent(nsIURI*, VisitedStatus);
static constexpr const size_t kTrackedUrisInitialSize = 64;
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 = nsTHashtable<nsURIHashKey>;
using PendingVisitedResults = nsTArray<mozilla::dom::VisitedQueryResult>;
// Starts all the queries in the pending queries list, potentially at the same
// time.
virtual void StartPendingVisitedQueries(const PendingVisitedQueries&) = 0;
void ScheduleVisitedQuery(nsIURI*);
// 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();
// A map from URI to links that depend on that URI, and whether that URI is
// known-to-be-visited-or-unvisited already.
nsDataHashtable<nsURIHashKey, ObservingLinks> mTrackedURIs;
// 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