pjs/netwerk/cache/memcache/nsMemCache.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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 Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
*/
/**
* nsMemCache is the implementation of an in-memory network-data
* cache, used to cache the responses to network retrieval commands.
* Each cache entry may contain both content, e.g. GIF image data, and
* associated metadata, e.g. HTTP headers. Each entry is indexed by
* two different keys: a record id number and an opaque key, which is
* created by the cache manager by combining the URI with a "secondary
* key", e.g. HTTP post data.
*/
#ifndef _nsMemCache_h_
#define _nsMemCache_h_
#include "nsINetDataCache.h"
// Maximum number of URIs that may be resident in the cache
#define MEM_CACHE_MAX_ENTRIES 1000
#define MEM_CACHE_SEGMENT_SIZE (1 << 12)
#define MEM_CACHE_MAX_ENTRY_SIZE (1 << 20)
class nsHashtable;
class nsMemCacheRecord;
class nsMemCache : public nsINetDataCache
{
public:
nsMemCache();
virtual ~nsMemCache();
nsresult Init();
// nsISupports methods
NS_DECL_ISUPPORTS
// nsINetDataCache methods
NS_DECL_NSINETDATACACHE
// Factory
static NS_METHOD nsMemCacheConstructor(nsISupports *aOuter, REFNSIID aIID,
void **aResult);
protected:
PRUint32 mNumEntries;
PRUint32 mOccupancy; // Memory used, in bytes
PRBool mEnabled; // If false, bypass mem cache
nsINetDataCache* mNextCache;
// Mapping from either opaque key or record ID to nsMemCacheRecord
nsHashtable* mHashTable;
// Used to assign record ID's
static PRInt32 gRecordSerialNumber;
NS_METHOD Delete(nsMemCacheRecord* aRecord);
friend class nsMemCacheRecord;
friend class nsMemCacheChannel;
};
#endif // _nsMemCache_h_