Mypal/netwerk/cache2/CacheFile.h

274 lines
9.4 KiB
C++

/* 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 CacheFile__h__
#define CacheFile__h__
#include "CacheFileChunk.h"
#include "CacheFileIOManager.h"
#include "CacheFileMetadata.h"
#include "nsRefPtrHashtable.h"
#include "nsClassHashtable.h"
#include "nsICacheEntry.h"
#include "mozilla/Mutex.h"
class nsIInputStream;
class nsIOutputStream;
class nsICacheEntryMetaDataVisitor;
namespace mozilla {
namespace net {
class CacheFileInputStream;
class CacheFileOutputStream;
class CacheOutputCloseListener;
class MetadataWriteTimer;
#define CACHEFILELISTENER_IID \
{ /* 95e7f284-84ba-48f9-b1fc-3a7336b4c33c */ \
0x95e7f284, \
0x84ba, \
0x48f9, \
{0xb1, 0xfc, 0x3a, 0x73, 0x36, 0xb4, 0xc3, 0x3c} \
}
class CacheFileListener : public nsISupports
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(CACHEFILELISTENER_IID)
NS_IMETHOD OnFileReady(nsresult aResult, bool aIsNew) = 0;
NS_IMETHOD OnFileDoomed(nsresult aResult) = 0;
};
NS_DEFINE_STATIC_IID_ACCESSOR(CacheFileListener, CACHEFILELISTENER_IID)
class CacheFile final : public CacheFileChunkListener
, public CacheFileIOListener
, public CacheFileMetadataListener
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
CacheFile();
nsresult Init(const nsACString &aKey,
bool aCreateNew,
bool aMemoryOnly,
bool aSkipSizeCheck,
bool aPriority,
bool aPinned,
CacheFileListener *aCallback);
NS_IMETHOD OnChunkRead(nsresult aResult, CacheFileChunk *aChunk) override;
NS_IMETHOD OnChunkWritten(nsresult aResult, CacheFileChunk *aChunk) override;
NS_IMETHOD OnChunkAvailable(nsresult aResult, uint32_t aChunkIdx,
CacheFileChunk *aChunk) override;
NS_IMETHOD OnChunkUpdated(CacheFileChunk *aChunk) override;
NS_IMETHOD OnFileOpened(CacheFileHandle *aHandle, nsresult aResult) override;
NS_IMETHOD OnDataWritten(CacheFileHandle *aHandle, const char *aBuf,
nsresult aResult) override;
NS_IMETHOD OnDataRead(CacheFileHandle *aHandle, char *aBuf, nsresult aResult) override;
NS_IMETHOD OnFileDoomed(CacheFileHandle *aHandle, nsresult aResult) override;
NS_IMETHOD OnEOFSet(CacheFileHandle *aHandle, nsresult aResult) override;
NS_IMETHOD OnFileRenamed(CacheFileHandle *aHandle, nsresult aResult) override;
virtual bool IsKilled() override;
NS_IMETHOD OnMetadataRead(nsresult aResult) override;
NS_IMETHOD OnMetadataWritten(nsresult aResult) override;
NS_IMETHOD OpenInputStream(nsICacheEntry *aCacheEntryHandle, nsIInputStream **_retval);
NS_IMETHOD OpenAlternativeInputStream(nsICacheEntry *aCacheEntryHandle,
const char *aAltDataType, nsIInputStream **_retval);
NS_IMETHOD OpenOutputStream(CacheOutputCloseListener *aCloseListener, nsIOutputStream **_retval);
NS_IMETHOD OpenAlternativeOutputStream(CacheOutputCloseListener *aCloseListener,
const char *aAltDataType, nsIOutputStream **_retval);
NS_IMETHOD SetMemoryOnly();
NS_IMETHOD Doom(CacheFileListener *aCallback);
void Kill() { mKill = true; }
nsresult ThrowMemoryCachedData();
nsresult GetAltDataSize(int64_t *aSize);
// metadata forwarders
nsresult GetElement(const char *aKey, char **_retval);
nsresult SetElement(const char *aKey, const char *aValue);
nsresult VisitMetaData(nsICacheEntryMetaDataVisitor *aVisitor);
nsresult ElementsSize(uint32_t *_retval);
nsresult SetExpirationTime(uint32_t aExpirationTime);
nsresult GetExpirationTime(uint32_t *_retval);
nsresult SetFrecency(uint32_t aFrecency);
nsresult GetFrecency(uint32_t *_retval);
nsresult GetLastModified(uint32_t *_retval);
nsresult GetLastFetched(uint32_t *_retval);
nsresult GetFetchCount(uint32_t *_retval);
nsresult GetDiskStorageSizeInKB(uint32_t *aDiskStorageSize);
// Called by upper layers to indicated the entry has been fetched,
// i.e. delivered to the consumer.
nsresult OnFetched();
bool DataSize(int64_t* aSize);
void Key(nsACString& aKey) { aKey = mKey; }
bool IsDoomed();
bool IsPinned() const { return mPinned; }
bool IsWriteInProgress();
// Memory reporting
size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
private:
friend class CacheFileIOManager;
friend class CacheFileChunk;
friend class CacheFileInputStream;
friend class CacheFileOutputStream;
friend class CacheFileAutoLock;
friend class MetadataWriteTimer;
virtual ~CacheFile();
void Lock();
void Unlock();
void AssertOwnsLock() const;
void ReleaseOutsideLock(RefPtr<nsISupports> aObject);
enum ECallerType {
READER = 0,
WRITER = 1,
PRELOADER = 2
};
nsresult DoomLocked(CacheFileListener *aCallback);
nsresult GetChunkLocked(uint32_t aIndex, ECallerType aCaller,
CacheFileChunkListener *aCallback,
CacheFileChunk **_retval);
void PreloadChunks(uint32_t aIndex);
bool ShouldCacheChunk(uint32_t aIndex);
bool MustKeepCachedChunk(uint32_t aIndex);
nsresult DeactivateChunk(CacheFileChunk *aChunk);
void RemoveChunkInternal(CacheFileChunk *aChunk, bool aCacheChunk);
bool OutputStreamExists(bool aAlternativeData);
// Returns number of bytes that are available and can be read by input stream
// without waiting for the data. The amount is counted from the start of
// aIndex chunk and it is guaranteed that this data won't be released by
// CleanUpCachedChunks().
int64_t BytesFromChunk(uint32_t aIndex, bool aAlternativeData);
nsresult Truncate(int64_t aOffset);
nsresult RemoveInput(CacheFileInputStream *aInput, nsresult aStatus);
nsresult RemoveOutput(CacheFileOutputStream *aOutput, nsresult aStatus);
nsresult NotifyChunkListener(CacheFileChunkListener *aCallback,
nsIEventTarget *aTarget,
nsresult aResult,
uint32_t aChunkIdx,
CacheFileChunk *aChunk);
nsresult QueueChunkListener(uint32_t aIndex,
CacheFileChunkListener *aCallback);
nsresult NotifyChunkListeners(uint32_t aIndex, nsresult aResult,
CacheFileChunk *aChunk);
bool HaveChunkListeners(uint32_t aIndex);
void NotifyListenersAboutOutputRemoval();
bool IsDirty();
void WriteMetadataIfNeeded();
void WriteMetadataIfNeededLocked(bool aFireAndForget = false);
void PostWriteTimer();
void CleanUpCachedChunks();
nsresult PadChunkWithZeroes(uint32_t aChunkIdx);
void SetError(nsresult aStatus);
nsresult InitIndexEntry();
mozilla::Mutex mLock;
bool mOpeningFile;
bool mReady;
bool mMemoryOnly;
bool mSkipSizeCheck;
bool mOpenAsMemoryOnly;
bool mPinned;
bool mPriority;
bool mDataAccessed;
bool mDataIsDirty;
bool mWritingMetadata;
bool mPreloadWithoutInputStreams;
uint32_t mPreloadChunkCount;
nsresult mStatus;
int64_t mDataSize; // Size of the whole data including eventual
// alternative data represenation.
int64_t mAltDataOffset; // If there is alternative data present, it
// contains size of the original data, i.e.
// offset where alternative data starts.
// Otherwise it is -1.
nsCString mKey;
RefPtr<CacheFileHandle> mHandle;
RefPtr<CacheFileMetadata> mMetadata;
nsCOMPtr<CacheFileListener> mListener;
nsCOMPtr<CacheFileIOListener> mDoomAfterOpenListener;
Atomic<bool, Relaxed> mKill;
nsRefPtrHashtable<nsUint32HashKey, CacheFileChunk> mChunks;
nsClassHashtable<nsUint32HashKey, ChunkListeners> mChunkListeners;
nsRefPtrHashtable<nsUint32HashKey, CacheFileChunk> mCachedChunks;
// We can truncate data only if there is no input/output stream beyond the
// truncate position, so only unused chunks can be thrown away. But it can
// happen that we need to throw away a chunk that is still in mChunks (i.e.
// an active chunk) because deactivation happens with a small delay. We cannot
// delete such chunk immediately but we need to ensure that such chunk won't
// be returned by GetChunkLocked, so we move this chunk into mDiscardedChunks
// and mark it as discarded.
nsTArray<RefPtr<CacheFileChunk> > mDiscardedChunks;
nsTArray<CacheFileInputStream*> mInputs;
CacheFileOutputStream *mOutput;
nsTArray<RefPtr<nsISupports>> mObjsToRelease;
};
class CacheFileAutoLock {
public:
explicit CacheFileAutoLock(CacheFile *aFile)
: mFile(aFile)
, mLocked(true)
{
mFile->Lock();
}
~CacheFileAutoLock()
{
if (mLocked)
mFile->Unlock();
}
void Lock()
{
MOZ_ASSERT(!mLocked);
mFile->Lock();
mLocked = true;
}
void Unlock()
{
MOZ_ASSERT(mLocked);
mFile->Unlock();
mLocked = false;
}
private:
RefPtr<CacheFile> mFile;
bool mLocked;
};
} // namespace net
} // namespace mozilla
#endif