mirror of
https://github.com/classilla/tenfourfox.git
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413 lines
13 KiB
C++
413 lines
13 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef CacheStorageService__h__
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#define CacheStorageService__h__
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#include "nsICacheStorageService.h"
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#include "nsIMemoryReporter.h"
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#include "nsITimer.h"
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#include "nsICacheTesting.h"
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#include "nsClassHashtable.h"
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#include "nsDataHashtable.h"
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#include "nsString.h"
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#include "nsThreadUtils.h"
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#include "nsProxyRelease.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/TimeStamp.h"
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#include "nsTArray.h"
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class nsIURI;
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class nsICacheEntryDoomCallback;
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class nsICacheStorageVisitor;
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class nsIRunnable;
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class nsIThread;
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class nsIEventTarget;
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namespace mozilla {
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namespace net {
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class CacheStorageService;
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class CacheStorage;
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class CacheEntry;
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class CacheEntryHandle;
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class CacheMemoryConsumer
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{
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private:
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friend class CacheStorageService;
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uint32_t mReportedMemoryConsumption : 30;
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uint32_t mFlags : 2;
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private:
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CacheMemoryConsumer() = delete;
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protected:
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enum {
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// No special treatment, reports always to the disk-entries pool.
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NORMAL = 0,
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// This consumer is belonging to a memory-only cache entry, used to decide
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// which of the two disk and memory pools count this consumption at.
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MEMORY_ONLY = 1 << 0,
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// Prevent reports of this consumer at all, used for disk data chunks since
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// we throw them away as soon as the entry is not used by any consumer and
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// don't want to make them wipe the whole pool out during their short life.
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DONT_REPORT = 1 << 1
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};
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explicit CacheMemoryConsumer(uint32_t aFlags);
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~CacheMemoryConsumer() { DoMemoryReport(0); }
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void DoMemoryReport(uint32_t aCurrentSize);
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};
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class CacheStorageService final : public nsICacheStorageService
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, public nsIMemoryReporter
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, public nsITimerCallback
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, public nsICacheTesting
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{
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSICACHESTORAGESERVICE
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NS_DECL_NSIMEMORYREPORTER
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NS_DECL_NSITIMERCALLBACK
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NS_DECL_NSICACHETESTING
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CacheStorageService();
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void Shutdown();
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void DropPrivateBrowsingEntries();
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// Takes care of deleting any pending trashes for both cache1 and cache2
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// as well as the cache directory of an inactive cache version when requested.
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static void CleaupCacheDirectories(uint32_t aVersion, uint32_t aActive);
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static CacheStorageService* Self() { return sSelf; }
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static nsISupports* SelfISupports() { return static_cast<nsICacheStorageService*>(Self()); }
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nsresult Dispatch(nsIRunnable* aEvent);
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static bool IsRunning() { return sSelf && !sSelf->mShutdown; }
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static bool IsOnManagementThread();
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already_AddRefed<nsIEventTarget> Thread() const;
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mozilla::Mutex& Lock() { return mLock; }
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// Tracks entries that may be forced valid in a pruned hashtable.
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nsDataHashtable<nsCStringHashKey, TimeStamp> mForcedValidEntries;
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void ForcedValidEntriesPrune(TimeStamp &now);
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// Helper thread-safe interface to pass entry info, only difference from
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// nsICacheStorageVisitor is that instead of nsIURI only the uri spec is
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// passed.
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class EntryInfoCallback {
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public:
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virtual void OnEntryInfo(const nsACString & aURISpec, const nsACString & aIdEnhance,
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int64_t aDataSize, int32_t aFetchCount,
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uint32_t aLastModifiedTime, uint32_t aExpirationTime,
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bool aPinned) = 0;
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};
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// Invokes OnEntryInfo for the given aEntry, synchronously.
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static void GetCacheEntryInfo(CacheEntry* aEntry, EntryInfoCallback *aVisitor);
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// Memory reporting
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size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
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MOZ_DEFINE_MALLOC_SIZE_OF(MallocSizeOf)
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private:
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virtual ~CacheStorageService();
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void ShutdownBackground();
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private:
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// The following methods may only be called on the management
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// thread.
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friend class CacheEntry;
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/**
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* Registers the entry in management ordered arrays, a mechanism
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* helping with weighted purge of entries.
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* Management arrays keep hard reference to the entry. Entry is
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* responsible to remove it self or the service is responsible to
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* remove the entry when it's no longer needed.
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*/
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void RegisterEntry(CacheEntry* aEntry);
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/**
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* Deregisters the entry from management arrays. References are
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* then released.
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*/
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void UnregisterEntry(CacheEntry* aEntry);
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/**
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* Removes the entry from the related entry hash table, if still present.
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*/
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bool RemoveEntry(CacheEntry* aEntry, bool aOnlyUnreferenced = false);
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/**
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* Tells the storage service whether this entry is only to be stored in
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* memory.
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*/
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void RecordMemoryOnlyEntry(CacheEntry* aEntry,
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bool aOnlyInMemory,
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bool aOverwrite);
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/**
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* Sets a cache entry valid (overrides the default loading behavior by loading
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* directly from cache) for the given number of seconds
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* See nsICacheEntry.idl for more details
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*/
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void ForceEntryValidFor(nsACString &aCacheEntryKey,
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uint32_t aSecondsToTheFuture);
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private:
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friend class CacheIndex;
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/**
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* Retrieves the status of the cache entry to see if it has been forced valid
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* (so it will loaded directly from cache without further validation)
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* CacheIndex uses this to prevent a cache entry from being prememptively
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* thrown away when forced valid
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* See nsICacheEntry.idl for more details
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*/
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bool IsForcedValidEntry(nsACString &aCacheEntryKey);
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private:
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// These are helpers for telemetry monitorying of the memory pools.
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void TelemetryPrune(TimeStamp &now);
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void TelemetryRecordEntryCreation(CacheEntry const* entry);
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void TelemetryRecordEntryRemoval(CacheEntry const* entry);
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private:
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// Following methods are thread safe to call.
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friend class CacheStorage;
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/**
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* Get, or create when not existing and demanded, an entry for the storage
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* and uri+id extension.
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*/
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nsresult AddStorageEntry(CacheStorage const* aStorage,
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nsIURI* aURI,
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const nsACString & aIdExtension,
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bool aCreateIfNotExist,
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bool aReplace,
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CacheEntryHandle** aResult);
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/**
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* Check existance of an entry. This may throw NS_ERROR_NOT_AVAILABLE
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* when the information cannot be obtained synchronously w/o blocking.
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*/
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nsresult CheckStorageEntry(CacheStorage const* aStorage,
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nsIURI* aURI,
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const nsACString & aIdExtension,
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bool* aResult);
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/**
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* Removes the entry from the related entry hash table, if still present
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* and returns it.
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*/
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nsresult DoomStorageEntry(CacheStorage const* aStorage,
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nsIURI* aURI,
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const nsACString & aIdExtension,
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nsICacheEntryDoomCallback* aCallback);
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/**
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* Removes and returns entry table for the storage.
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*/
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nsresult DoomStorageEntries(CacheStorage const* aStorage,
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nsICacheEntryDoomCallback* aCallback);
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/**
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* Walk all entiries beloging to the storage.
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*/
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nsresult WalkStorageEntries(CacheStorage const* aStorage,
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bool aVisitEntries,
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nsICacheStorageVisitor* aVisitor);
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private:
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friend class CacheFileIOManager;
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/**
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* CacheFileIOManager uses this method to notify CacheStorageService that
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* an active entry was removed. This method is called even if the entry
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* removal was originated by CacheStorageService.
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*/
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void CacheFileDoomed(nsILoadContextInfo* aLoadContextInfo,
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const nsACString & aIdExtension,
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const nsACString & aURISpec);
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/**
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* Tries to find an existing entry in the hashtables and synchronously call
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* OnCacheEntryInfo of the aVisitor callback when found.
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* @retuns
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* true, when the entry has been found that also implies the callbacks has
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* beem invoked
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* false, when an entry has not been found
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*/
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bool GetCacheEntryInfo(nsILoadContextInfo* aLoadContextInfo,
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const nsACString & aIdExtension,
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const nsACString & aURISpec,
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EntryInfoCallback *aCallback);
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private:
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friend class CacheMemoryConsumer;
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/**
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* When memory consumption of this entry radically changes, this method
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* is called to reflect the size of allocated memory. This call may purge
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* unspecified number of entries from memory (but not from disk).
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*/
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void OnMemoryConsumptionChange(CacheMemoryConsumer* aConsumer,
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uint32_t aCurrentMemoryConsumption);
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/**
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* If not already pending, it schedules mPurgeTimer that fires after 1 second
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* and dispatches PurgeOverMemoryLimit().
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*/
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void SchedulePurgeOverMemoryLimit();
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/**
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* Called on the management thread, removes all expired and then least used
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* entries from the memory, first from the disk pool and then from the memory
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* pool.
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*/
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void PurgeOverMemoryLimit();
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private:
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nsresult DoomStorageEntries(nsCSubstring const& aContextKey,
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nsILoadContextInfo* aContext,
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bool aDiskStorage,
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bool aPin,
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nsICacheEntryDoomCallback* aCallback);
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nsresult AddStorageEntry(nsCSubstring const& aContextKey,
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nsIURI* aURI,
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const nsACString & aIdExtension,
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bool aWriteToDisk,
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bool aSkipSizeCheck,
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bool aPin,
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bool aCreateIfNotExist,
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bool aReplace,
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CacheEntryHandle** aResult);
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static CacheStorageService* sSelf;
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mozilla::Mutex mLock;
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mozilla::Mutex mForcedValidEntriesLock;
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bool mShutdown;
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// Accessible only on the service thread
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class MemoryPool
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{
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public:
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enum EType
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{
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DISK,
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MEMORY,
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} mType;
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explicit MemoryPool(EType aType);
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~MemoryPool();
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nsTArray<RefPtr<CacheEntry> > mFrecencyArray;
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nsTArray<RefPtr<CacheEntry> > mExpirationArray;
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Atomic<uint32_t, Relaxed> mMemorySize;
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bool OnMemoryConsumptionChange(uint32_t aSavedMemorySize,
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uint32_t aCurrentMemoryConsumption);
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/**
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* Purges entries from memory based on the frecency ordered array.
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*/
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void PurgeOverMemoryLimit();
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void PurgeExpired();
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void PurgeByFrecency(bool &aFrecencyNeedsSort, uint32_t aWhat);
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void PurgeAll(uint32_t aWhat);
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private:
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uint32_t const Limit() const;
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MemoryPool() = delete;
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};
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MemoryPool mDiskPool;
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MemoryPool mMemoryPool;
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TimeStamp mLastPurgeTime;
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MemoryPool& Pool(bool aUsingDisk)
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{
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return aUsingDisk ? mDiskPool : mMemoryPool;
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}
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MemoryPool const& Pool(bool aUsingDisk) const
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{
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return aUsingDisk ? mDiskPool : mMemoryPool;
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}
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nsCOMPtr<nsITimer> mPurgeTimer;
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class PurgeFromMemoryRunnable : public nsRunnable
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{
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public:
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PurgeFromMemoryRunnable(CacheStorageService* aService, uint32_t aWhat)
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: mService(aService), mWhat(aWhat) { }
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private:
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virtual ~PurgeFromMemoryRunnable() { }
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NS_IMETHOD Run() override;
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RefPtr<CacheStorageService> mService;
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uint32_t mWhat;
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};
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// Used just for telemetry purposes, accessed only on the management thread.
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// Note: not included in the memory reporter, this is not expected to be huge
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// and also would be complicated to report since reporting happens on the main
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// thread but this table is manipulated on the management thread.
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nsDataHashtable<nsCStringHashKey, mozilla::TimeStamp> mPurgeTimeStamps;
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// nsICacheTesting
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class IOThreadSuspender : public nsRunnable
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{
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public:
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IOThreadSuspender() : mMon("IOThreadSuspender"), mSignaled(false) { }
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void Notify();
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private:
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virtual ~IOThreadSuspender() { }
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NS_IMETHOD Run() override;
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Monitor mMon;
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bool mSignaled;
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};
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RefPtr<IOThreadSuspender> mActiveIOSuspender;
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};
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template<class T>
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void ProxyRelease(nsCOMPtr<T> &object, nsIThread* thread)
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{
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T* release;
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object.forget(&release);
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NS_ProxyRelease(thread, release);
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}
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template<class T>
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void ProxyReleaseMainThread(nsCOMPtr<T> &object)
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{
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nsCOMPtr<nsIThread> mainThread = do_GetMainThread();
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ProxyRelease(object, mainThread);
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}
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} // namespace net
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} // namespace mozilla
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#define NS_CACHE_STORAGE_SERVICE_CID \
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{ 0xea70b098, 0x5014, 0x4e21, \
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{ 0xae, 0xe1, 0x75, 0xe6, 0xb2, 0xc4, 0xb8, 0xe0 } } \
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#define NS_CACHE_STORAGE_SERVICE_CONTRACTID \
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"@mozilla.org/netwerk/cache-storage-service;1"
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#define NS_CACHE_STORAGE_SERVICE_CONTRACTID2 \
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"@mozilla.org/network/cache-storage-service;1"
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#endif
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