зеркало из https://github.com/mozilla/gecko-dev.git
121 строка
4.2 KiB
C++
121 строка
4.2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
|
|
*
|
|
* 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 _nsDiskCacheBinding_h_
|
|
#define _nsDiskCacheBinding_h_
|
|
|
|
#include "mozilla/MemoryReporting.h"
|
|
#include "nspr.h"
|
|
#include "pldhash.h"
|
|
|
|
#include "nsISupports.h"
|
|
#include "nsCacheEntry.h"
|
|
|
|
#include "nsDiskCacheMap.h"
|
|
#include "nsDiskCacheStreams.h"
|
|
|
|
|
|
/******************************************************************************
|
|
* nsDiskCacheBinding
|
|
*
|
|
* Created for disk cache specific data and stored in nsCacheEntry.mData as
|
|
* an nsISupports. Also stored in nsDiskCacheHashTable, with collisions
|
|
* linked by the PRCList.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
class nsDiskCacheDeviceDeactivateEntryEvent;
|
|
|
|
class nsDiskCacheBinding : public nsISupports, public PRCList {
|
|
public:
|
|
NS_DECL_THREADSAFE_ISUPPORTS
|
|
|
|
nsDiskCacheBinding(nsCacheEntry* entry, nsDiskCacheRecord * record);
|
|
virtual ~nsDiskCacheBinding();
|
|
|
|
nsresult EnsureStreamIO();
|
|
bool IsActive() { return mCacheEntry != nullptr;}
|
|
|
|
// XXX make friends
|
|
public:
|
|
nsCacheEntry* mCacheEntry; // back pointer to parent nsCacheEntry
|
|
nsDiskCacheRecord mRecord;
|
|
nsDiskCacheStreamIO* mStreamIO; // strong reference
|
|
bool mDoomed; // record is not stored in cache map
|
|
uint8_t mGeneration; // possibly just reservation
|
|
|
|
// If set, points to a pending event which will deactivate |mCacheEntry|.
|
|
// If not set then either |mCacheEntry| is not deactivated, or it has been
|
|
// deactivated but the device returned it from FindEntry() before the event
|
|
// fired. In both two latter cases this binding is to be considered valid.
|
|
nsDiskCacheDeviceDeactivateEntryEvent *mDeactivateEvent;
|
|
};
|
|
|
|
|
|
/******************************************************************************
|
|
* Utility Functions
|
|
*****************************************************************************/
|
|
|
|
nsDiskCacheBinding * GetCacheEntryBinding(nsCacheEntry * entry);
|
|
|
|
|
|
|
|
/******************************************************************************
|
|
* nsDiskCacheBindery
|
|
*
|
|
* Used to keep track of nsDiskCacheBinding associated with active/bound (and
|
|
* possibly doomed) entries. Lookups on 4 byte disk hash to find collisions
|
|
* (which need to be doomed, instead of just evicted. Collisions are linked
|
|
* using a PRCList to keep track of current generation number.
|
|
*
|
|
* Used to detect hash number collisions, and find available generation numbers.
|
|
*
|
|
* Not all nsDiskCacheBinding have a generation number.
|
|
*
|
|
* Generation numbers may be aquired late, or lost (when data fits in block file)
|
|
*
|
|
* Collisions can occur:
|
|
* BindEntry() - hashnumbers collide (possibly different keys)
|
|
*
|
|
* Generation number required:
|
|
* DeactivateEntry() - metadata written to disk, may require file
|
|
* GetFileForEntry() - force data to require file
|
|
* writing to stream - data size may require file
|
|
*
|
|
* Binding can be kept in PRCList in order of generation numbers.
|
|
* Binding with no generation number can be Appended to PRCList (last).
|
|
*
|
|
*****************************************************************************/
|
|
|
|
class nsDiskCacheBindery {
|
|
public:
|
|
nsDiskCacheBindery();
|
|
~nsDiskCacheBindery();
|
|
|
|
nsresult Init();
|
|
void Reset();
|
|
|
|
nsDiskCacheBinding * CreateBinding(nsCacheEntry * entry,
|
|
nsDiskCacheRecord * record);
|
|
|
|
nsDiskCacheBinding * FindActiveBinding(uint32_t hashNumber);
|
|
void RemoveBinding(nsDiskCacheBinding * binding);
|
|
bool ActiveBindings();
|
|
|
|
size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf);
|
|
|
|
private:
|
|
nsresult AddBinding(nsDiskCacheBinding * binding);
|
|
|
|
// member variables
|
|
static const PLDHashTableOps ops;
|
|
PLDHashTable table;
|
|
bool initialized;
|
|
};
|
|
|
|
#endif /* _nsDiskCacheBinding_h_ */
|