pjs/netwerk/cache/nsCacheEntry.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 nsCacheEntry.h, released
* February 22, 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>
*
* 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 _nsCacheEntry_h_
#define _nsCacheEntry_h_
#include "nsICache.h"
#include "nsICacheEntryDescriptor.h"
#include "nsIThread.h"
#include "nsCacheMetaData.h"
#include "nspr.h"
#include "pldhash.h"
#include "nscore.h"
#include "nsCOMPtr.h"
#include "nsString.h"
#include "nsAString.h"
class nsCacheDevice;
class nsCacheMetaData;
class nsCacheRequest;
class nsCacheEntryDescriptor;
/******************************************************************************
* nsCacheEntry
*******************************************************************************/
class nsCacheEntry : public PRCList
{
public:
nsCacheEntry(nsCString * key,
PRBool streamBased,
nsCacheStoragePolicy storagePolicy);
~nsCacheEntry();
static nsresult Create( const char * key,
PRBool streamBased,
nsCacheStoragePolicy storagePolicy,
nsCacheDevice * device,
nsCacheEntry ** result);
nsCString * Key() { return mKey; }
PRInt32 FetchCount() { return mFetchCount; }
void SetFetchCount( PRInt32 count) { mFetchCount = count; }
void Fetched();
PRUint32 LastFetched() { return mLastFetched; }
void SetLastFetched( PRUint32 lastFetched) { mLastFetched = lastFetched; }
PRUint32 LastModified() { return mLastModified; }
void SetLastModified( PRUint32 lastModified) { mLastModified = lastModified; }
PRUint32 ExpirationTime() { return mExpirationTime; }
void SetExpirationTime( PRUint32 expires) { mExpirationTime = expires; }
PRUint32 Size() { return mDataSize + mMetaData.Size(); }
nsCacheDevice * CacheDevice() { return mCacheDevice; }
void SetCacheDevice( nsCacheDevice * device) { mCacheDevice = device; }
const char * GetDeviceID();
/**
* Data accessors
*/
nsISupports *Data() { return mData; }
void SetData( nsISupports * data);
PRUint32 DataSize() { return mDataSize; }
void SetDataSize( PRUint32 size) { mDataSize = size; }
void TouchData();
/**
* Meta data accessors
*/
const char * GetMetaDataElement( const char * key) { return mMetaData.GetElement(key); }
nsresult SetMetaDataElement( const char * key,
const char * value) { return mMetaData.SetElement(key, value); }
nsresult VisitMetaDataElements( nsICacheMetaDataVisitor * visitor) { return mMetaData.VisitElements(visitor); }
nsresult FlattenMetaData(char * buffer, PRUint32 bufSize) { return mMetaData.FlattenMetaData(buffer, bufSize); }
nsresult UnflattenMetaData(const char * buffer, PRUint32 bufSize) { return mMetaData.UnflattenMetaData(buffer, bufSize); }
PRUint32 MetaDataSize() { return mMetaData.Size(); }
void TouchMetaData();
/**
* Security Info accessors
*/
nsISupports* SecurityInfo() { return mSecurityInfo; }
void SetSecurityInfo( nsISupports * info) { mSecurityInfo = info; }
// XXX enumerate MetaData method
enum CacheEntryFlags {
eStoragePolicyMask = 0x000000FF,
eDoomedMask = 0x00000100,
eEntryDirtyMask = 0x00000200,
eDataDirtyMask = 0x00000400,
eMetaDataDirtyMask = 0x00000800,
eStreamDataMask = 0x00001000,
eActiveMask = 0x00002000,
eInitializedMask = 0x00004000,
eValidMask = 0x00008000,
eBindingMask = 0x00010000
};
void MarkBinding() { mFlags |= eBindingMask; }
void ClearBinding() { mFlags &= ~eBindingMask; }
PRBool IsBinding() { return (mFlags & eBindingMask) != 0; }
void MarkEntryDirty() { mFlags |= eEntryDirtyMask; }
void MarkEntryClean() { mFlags &= ~eEntryDirtyMask; }
void MarkDataDirty() { mFlags |= eDataDirtyMask; }
void MarkDataClean() { mFlags &= ~eDataDirtyMask; }
void MarkMetaDataDirty() { mFlags |= eMetaDataDirtyMask; }
void MarkMetaDataClean() { mFlags &= ~eMetaDataDirtyMask; }
void MarkStreamData() { mFlags |= eStreamDataMask; }
void MarkValid() { mFlags |= eValidMask; }
void MarkInvalid() { mFlags &= ~eValidMask; }
// void MarkAllowedInMemory() { mFlags |= eAllowedInMemoryMask; }
// void MarkAllowedOnDisk() { mFlags |= eAllowedOnDiskMask; }
PRBool IsDoomed() { return (mFlags & eDoomedMask) != 0; }
PRBool IsEntryDirty() { return (mFlags & eEntryDirtyMask) != 0; }
PRBool IsDataDirty() { return (mFlags & eDataDirtyMask) != 0; }
PRBool IsMetaDataDirty() { return (mFlags & eMetaDataDirtyMask) != 0; }
PRBool IsStreamData() { return (mFlags & eStreamDataMask) != 0; }
PRBool IsActive() { return (mFlags & eActiveMask) != 0; }
PRBool IsInitialized() { return (mFlags & eInitializedMask) != 0; }
PRBool IsValid() { return (mFlags & eValidMask) != 0; }
PRBool IsInvalid() { return (mFlags & eValidMask) == 0; }
PRBool IsInUse() { return IsBinding() ||
!(PR_CLIST_IS_EMPTY(&mRequestQ) &&
PR_CLIST_IS_EMPTY(&mDescriptorQ)); }
PRBool IsNotInUse() { return !IsInUse(); }
PRBool IsAllowedInMemory()
{
return (StoragePolicy() == nsICache::STORE_ANYWHERE) ||
(StoragePolicy() == nsICache::STORE_IN_MEMORY);
}
PRBool IsAllowedOnDisk()
{
return (StoragePolicy() == nsICache::STORE_ANYWHERE) ||
(StoragePolicy() == nsICache::STORE_ON_DISK) ||
(StoragePolicy() == nsICache::STORE_ON_DISK_AS_FILE);
}
PRBool IsAllowedOffline()
{
return (StoragePolicy() == nsICache::STORE_OFFLINE);
}
nsCacheStoragePolicy StoragePolicy()
{
return (nsCacheStoragePolicy)(mFlags & eStoragePolicyMask);
}
void SetStoragePolicy(nsCacheStoragePolicy policy)
{
NS_ASSERTION(policy <= 0xFF, "too many bits in nsCacheStoragePolicy");
mFlags &= ~eStoragePolicyMask; // clear storage policy bits
mFlags |= policy;
}
// methods for nsCacheService
nsresult RequestAccess( nsCacheRequest * request, nsCacheAccessMode *accessGranted);
nsresult CreateDescriptor( nsCacheRequest * request,
nsCacheAccessMode accessGranted,
nsICacheEntryDescriptor ** result);
// nsresult Open(nsCacheRequest *request, nsICacheEntryDescriptor ** result);
// nsresult AsyncOpen(nsCacheRequest *request);
PRBool RemoveRequest( nsCacheRequest * request);
PRBool RemoveDescriptor( nsCacheEntryDescriptor * descriptor);
private:
friend class nsCacheEntryHashTable;
friend class nsCacheService;
void DetachDescriptors(void);
// internal methods
void MarkDoomed() { mFlags |= eDoomedMask; }
void MarkStreamBased() { mFlags |= eStreamDataMask; }
void MarkInitialized() { mFlags |= eInitializedMask; }
void MarkActive() { mFlags |= eActiveMask; }
void MarkInactive() { mFlags &= ~eActiveMask; }
nsCString * mKey; // 4 // XXX ask scc about const'ness
PRUint32 mFetchCount; // 4
PRUint32 mLastFetched; // 4
PRUint32 mLastModified; // 4
PRUint32 mLastValidated; // 4
PRUint32 mExpirationTime; // 4
PRUint32 mFlags; // 4
PRUint32 mDataSize; // 4
nsCacheDevice * mCacheDevice; // 4
nsCOMPtr<nsISupports> mSecurityInfo; //
nsISupports * mData; // strong ref
nsCOMPtr<nsIThread> mThread;
nsCacheMetaData mMetaData; // 4
PRCList mRequestQ; // 8
PRCList mDescriptorQ; // 8
};
/******************************************************************************
* nsCacheEntryInfo
*******************************************************************************/
class nsCacheEntryInfo : public nsICacheEntryInfo {
public:
NS_DECL_ISUPPORTS
NS_DECL_NSICACHEENTRYINFO
nsCacheEntryInfo(nsCacheEntry* entry)
: mCacheEntry(entry)
{
}
virtual ~nsCacheEntryInfo() {}
void DetachEntry() { mCacheEntry = nsnull; }
private:
nsCacheEntry * mCacheEntry;
};
/******************************************************************************
* nsCacheEntryHashTable
*******************************************************************************/
typedef struct {
PLDHashNumber keyHash;
nsCacheEntry *cacheEntry;
} nsCacheEntryHashTableEntry;
class nsCacheEntryHashTable
{
public:
nsCacheEntryHashTable();
~nsCacheEntryHashTable();
nsresult Init();
void Shutdown();
nsCacheEntry *GetEntry( const nsCString * key);
nsresult AddEntry( nsCacheEntry *entry);
void RemoveEntry( nsCacheEntry *entry);
void VisitEntries( PLDHashEnumerator etor, void *arg);
private:
// PLDHashTable operation callbacks
static PLDHashNumber HashKey( PLDHashTable *table, const void *key);
static PRBool MatchEntry( PLDHashTable * table,
const PLDHashEntryHdr * entry,
const void * key);
static void MoveEntry( PLDHashTable *table,
const PLDHashEntryHdr *from,
PLDHashEntryHdr *to);
static void ClearEntry( PLDHashTable *table, PLDHashEntryHdr *entry);
static void Finalize( PLDHashTable *table);
static
PLDHashOperator FreeCacheEntries(PLDHashTable * table,
PLDHashEntryHdr * hdr,
PRUint32 number,
void * arg);
static
PLDHashOperator VisitEntry(PLDHashTable * table,
PLDHashEntryHdr * hdr,
PRUint32 number,
void * arg);
// member variables
static PLDHashTableOps ops;
PLDHashTable table;
PRBool initialized;
};
#endif // _nsCacheEntry_h_