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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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_places_History_h_
#define mozilla_places_History_h_
#include "mozilla/IHistory.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Mutex.h"
#include "mozIAsyncHistory.h"
#include "nsIDownloadHistory.h"
#include "Database.h"
#include "mozilla/dom/Link.h"
#include "nsTHashtable.h"
#include "nsString.h"
#include "nsURIHashKey.h"
#include "nsTObserverArray.h"
#include "nsDeque.h"
#include "nsIMemoryReporter.h"
#include "nsIObserver.h"
#include "mozIStorageConnection.h"
namespace mozilla {
namespace places {
struct VisitData;
class ConcurrentStatementsHolder;
#define NS_HISTORYSERVICE_CID \
{0x0937a705, 0x91a6, 0x417a, {0x82, 0x92, 0xb2, 0x2e, 0xb1, 0x0d, 0xa8, 0x6c}}
// Initial size of mRecentlyVisitedURIs.
#define RECENTLY_VISITED_URIS_SIZE 64
// Microseconds after which a visit can be expired from mRecentlyVisitedURIs.
// When an URI is reloaded we only take into account the first visit to it, and
// ignore any subsequent visits, if they happen before this time has elapsed.
// A commonly found case is to reload a page every 5 minutes, so we pick a time
// larger than that.
#define RECENTLY_VISITED_URIS_MAX_AGE 6 * 60 * PR_USEC_PER_SEC
class History final : public IHistory
, public nsIDownloadHistory
, public mozIAsyncHistory
, public nsIObserver
, public nsIMemoryReporter
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_IHISTORY
NS_DECL_NSIDOWNLOADHISTORY
NS_DECL_MOZIASYNCHISTORY
NS_DECL_NSIOBSERVER
NS_DECL_NSIMEMORYREPORTER
History();
/**
* Obtains the statement to use to check if a URI is visited or not.
*/
nsresult GetIsVisitedStatement(mozIStorageCompletionCallback* aCallback);
/**
* Adds an entry in moz_places with the data in aVisitData.
*
* @param aVisitData
* The visit data to use to populate a new row in moz_places.
*/
nsresult InsertPlace(VisitData& aVisitData);
/**
* Updates an entry in moz_places with the data in aVisitData.
*
* @param aVisitData
* The visit data to use to update the existing row in moz_places.
*/
nsresult UpdatePlace(const VisitData& aVisitData);
/**
* Loads information about the page into _place from moz_places.
*
* @param _place
* The VisitData for the place we need to know information about.
* @param [out] _exists
* Whether or the page was recorded in moz_places, false otherwise.
*/
nsresult FetchPageInfo(VisitData& _place, bool* _exists);
/**
* Get the number of bytes of memory this History object is using,
* including sizeof(*this))
*/
size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf);
/**
* Obtains a pointer to this service.
*/
static History* GetService();
/**
* Obtains a pointer that has had AddRef called on it. Used by the service
* manager only.
*/
static History* GetSingleton();
template<int N>
already_AddRefed<mozIStorageStatement>
GetStatement(const char (&aQuery)[N])
{
mozIStorageConnection* dbConn = GetDBConn();
NS_ENSURE_TRUE(dbConn, nullptr);
return mDB->GetStatement(aQuery);
}
already_AddRefed<mozIStorageStatement>
GetStatement(const nsACString& aQuery)
{
mozIStorageConnection* dbConn = GetDBConn();
NS_ENSURE_TRUE(dbConn, nullptr);
return mDB->GetStatement(aQuery);
}
bool IsShuttingDown() const {
return mShuttingDown;
}
Mutex& GetShutdownMutex() {
return mShutdownMutex;
}
/**
* Helper function to append a new URI to mRecentlyVisitedURIs. See
* mRecentlyVisitedURIs.
*/
void AppendToRecentlyVisitedURIs(nsIURI* aURI);
private:
virtual ~History();
void InitMemoryReporter();
/**
* Obtains a read-write database connection.
*/
mozIStorageConnection* GetDBConn();
/**
* The database handle. This is initialized lazily by the first call to
* GetDBConn(), so never use it directly, or, if you really need, always
* invoke GetDBConn() before.
*/
RefPtr<mozilla::places::Database> mDB;
RefPtr<ConcurrentStatementsHolder> mConcurrentStatementsHolder;
/**
* Remove any memory references to tasks and do not take on any more.
*/
void Shutdown();
static History* gService;
// Ensures new tasks aren't started on destruction.
bool mShuttingDown;
// This mutex guards mShuttingDown. Code running in other threads that might
// schedule tasks that use the database should grab it and check the value of
// mShuttingDown. If we are already shutting down, the code must gracefully
// avoid using the db. If we are not, the lock will prevent shutdown from
// starting in an unexpected moment.
Mutex mShutdownMutex;
typedef nsTObserverArray<mozilla::dom::Link* > ObserverArray;
class KeyClass : public nsURIHashKey
{
public:
explicit KeyClass(const nsIURI* aURI)
: nsURIHashKey(aURI)
{
}
KeyClass(const KeyClass& aOther)
: nsURIHashKey(aOther)
{
NS_NOTREACHED("Do not call me!");
}
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
return array.ShallowSizeOfExcludingThis(aMallocSizeOf);
}
ObserverArray array;
};
nsTHashtable<KeyClass> mObservers;
/**
* mRecentlyVisitedURIs remembers URIs which have been recently added to
* history, to avoid saving these locations repeatedly in a short period.
*/
class RecentURIKey : public nsURIHashKey
{
public:
explicit RecentURIKey(const nsIURI* aURI) : nsURIHashKey(aURI)
{
}
RecentURIKey(const RecentURIKey& aOther) : nsURIHashKey(aOther)
{
NS_NOTREACHED("Do not call me!");
}
MOZ_INIT_OUTSIDE_CTOR PRTime time;
};
nsTHashtable<RecentURIKey> mRecentlyVisitedURIs;
/**
* Whether aURI has been visited "recently".
* See RECENTLY_VISITED_URIS_MAX_AGE.
*/
bool IsRecentlyVisitedURI(nsIURI* aURI);
};
} // namespace places
} // namespace mozilla
#endif // mozilla_places_History_h_
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