125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _nsMemoryCacheDevice_h_
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#define _nsMemoryCacheDevice_h_
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#include "nsCacheDevice.h"
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#include "PLDHashTable.h"
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#include "nsCacheEntry.h"
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class nsMemoryCacheDeviceInfo;
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/******************************************************************************
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* nsMemoryCacheDevice
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******************************************************************************/
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class nsMemoryCacheDevice : public nsCacheDevice
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{
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public:
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nsMemoryCacheDevice();
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virtual ~nsMemoryCacheDevice();
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virtual nsresult Init();
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virtual nsresult Shutdown();
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virtual const char * GetDeviceID(void);
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virtual nsresult BindEntry( nsCacheEntry * entry );
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virtual nsCacheEntry * FindEntry( nsCString * key, bool *collision );
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virtual void DoomEntry( nsCacheEntry * entry );
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virtual nsresult DeactivateEntry( nsCacheEntry * entry );
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virtual nsresult OpenInputStreamForEntry(nsCacheEntry * entry,
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nsCacheAccessMode mode,
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uint32_t offset,
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nsIInputStream ** result);
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virtual nsresult OpenOutputStreamForEntry(nsCacheEntry * entry,
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nsCacheAccessMode mode,
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uint32_t offset,
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nsIOutputStream ** result);
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virtual nsresult GetFileForEntry( nsCacheEntry * entry,
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nsIFile ** result );
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virtual nsresult OnDataSizeChange( nsCacheEntry * entry, int32_t deltaSize );
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virtual nsresult Visit( nsICacheVisitor * visitor );
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virtual nsresult EvictEntries(const char * clientID);
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nsresult EvictPrivateEntries();
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void SetCapacity(int32_t capacity);
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void SetMaxEntrySize(int32_t maxSizeInKilobytes);
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bool EntryIsTooBig(int64_t entrySize);
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size_t TotalSize();
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private:
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friend class nsMemoryCacheDeviceInfo;
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enum { DELETE_ENTRY = true,
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DO_NOT_DELETE_ENTRY = false };
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void AdjustMemoryLimits( int32_t softLimit, int32_t hardLimit);
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void EvictEntry( nsCacheEntry * entry , bool deleteEntry);
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void EvictEntriesIfNecessary();
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int EvictionList(nsCacheEntry * entry, int32_t deltaSize);
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typedef bool (*EvictionMatcherFn)(nsCacheEntry* entry, void* args);
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nsresult DoEvictEntries(EvictionMatcherFn matchFn, void* args);
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#ifdef DEBUG
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void CheckEntryCount();
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#endif
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/*
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* Data members
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*/
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enum {
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kQueueCount = 24 // entries > 2^23 (8Mb) start in last queue
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};
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nsCacheEntryHashTable mMemCacheEntries;
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bool mInitialized;
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PRCList mEvictionList[kQueueCount];
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int32_t mHardLimit;
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int32_t mSoftLimit;
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int32_t mTotalSize;
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int32_t mInactiveSize;
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int32_t mEntryCount;
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int32_t mMaxEntryCount;
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int32_t mMaxEntrySize; // internal unit is bytes
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// XXX what other stats do we want to keep?
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};
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/******************************************************************************
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* nsMemoryCacheDeviceInfo - used to call nsIVisitor for about:cache
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******************************************************************************/
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class nsMemoryCacheDeviceInfo : public nsICacheDeviceInfo {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSICACHEDEVICEINFO
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explicit nsMemoryCacheDeviceInfo(nsMemoryCacheDevice* device)
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: mDevice(device)
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{
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}
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private:
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virtual ~nsMemoryCacheDeviceInfo() {}
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nsMemoryCacheDevice* mDevice;
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};
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#endif // _nsMemoryCacheDevice_h_
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