pjs/netwerk/cache/nsDiskCacheDevice.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is nsDiskCacheDevice.h, released
* February 20, 2001.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Gordon Sheridan <gordon@netscape.com>
* Patrick C. Beard <beard@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef _nsDiskCacheDevice_h_
#define _nsDiskCacheDevice_h_
#include "nsCacheDevice.h"
#include "nsDiskCacheBinding.h"
#include "nsDiskCacheBlockFile.h"
#include "nsDiskCacheEntry.h"
#include "nsILocalFile.h"
#include "nsIObserver.h"
#include "nsCOMArray.h"
class nsDiskCacheMap;
class nsDiskCacheDevice : public nsCacheDevice {
public:
nsDiskCacheDevice();
virtual ~nsDiskCacheDevice();
virtual nsresult Init();
virtual nsresult Shutdown();
virtual const char * GetDeviceID(void);
virtual nsCacheEntry * FindEntry(nsCString * key, bool *collision);
virtual nsresult DeactivateEntry(nsCacheEntry * entry);
virtual nsresult BindEntry(nsCacheEntry * entry);
virtual void DoomEntry( nsCacheEntry * entry );
virtual nsresult OpenInputStreamForEntry(nsCacheEntry * entry,
nsCacheAccessMode mode,
PRUint32 offset,
nsIInputStream ** result);
virtual nsresult OpenOutputStreamForEntry(nsCacheEntry * entry,
nsCacheAccessMode mode,
PRUint32 offset,
nsIOutputStream ** result);
virtual nsresult GetFileForEntry(nsCacheEntry * entry,
nsIFile ** result);
virtual nsresult OnDataSizeChange(nsCacheEntry * entry, PRInt32 deltaSize);
virtual nsresult Visit(nsICacheVisitor * visitor);
virtual nsresult EvictEntries(const char * clientID);
bool EntryIsTooBig(PRInt64 entrySize);
/**
* Preference accessors
*/
void SetCacheParentDirectory(nsILocalFile * parentDir);
void SetCapacity(PRUint32 capacity);
void SetMaxEntrySize(PRInt32 maxSizeInKilobytes);
/* private: */
void getCacheDirectory(nsILocalFile ** result);
PRUint32 getCacheCapacity();
PRUint32 getCacheSize();
PRUint32 getEntryCount();
nsDiskCacheMap * CacheMap() { return &mCacheMap; }
private:
friend class nsDiskCacheDeviceDeactivateEntryEvent;
friend class nsEvictDiskCacheEntriesEvent;
/**
* Private methods
*/
inline bool IsValidBinding(nsDiskCacheBinding *binding)
{
NS_ASSERTION(binding, " binding == nsnull");
NS_ASSERTION(binding->mDeactivateEvent == nsnull,
" entry in process of deactivation");
return (binding && !binding->mDeactivateEvent);
}
bool Initialized() { return mInitialized; }
nsresult Shutdown_Private(bool flush);
nsresult DeactivateEntry_Private(nsCacheEntry * entry,
nsDiskCacheBinding * binding);
nsresult OpenDiskCache();
nsresult ClearDiskCache();
nsresult EvictDiskCacheEntries(PRUint32 targetCapacity);
/**
* Member variables
*/
nsCOMPtr<nsILocalFile> mCacheDirectory;
nsDiskCacheBindery mBindery;
PRUint32 mCacheCapacity; // Unit is KiB's
PRInt32 mMaxEntrySize; // Unit is bytes internally
// XXX need soft/hard limits, currentTotal
nsDiskCacheMap mCacheMap;
bool mInitialized;
bool mClearingDiskCache;
};
#endif // _nsDiskCacheDevice_h_