/* -*- 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 nsCacheService.h, released * February 10, 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 * Patrick C. Beard * Darin Fisher * Ehsan Akhgari * * 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 _nsCacheService_h_ #define _nsCacheService_h_ #include "nsICacheService.h" #include "nsCacheSession.h" #include "nsCacheDevice.h" #include "nsCacheEntry.h" #include "prthread.h" #include "nsIObserver.h" #include "nsString.h" #include "nsTArray.h" #include "mozilla/CondVar.h" #include "mozilla/Mutex.h" class nsCacheRequest; class nsCacheProfilePrefObserver; class nsDiskCacheDevice; class nsMemoryCacheDevice; class nsOfflineCacheDevice; class nsCacheServiceAutoLock; /****************************************************************************** * nsCacheService ******************************************************************************/ class nsCacheService : public nsICacheService { public: NS_DECL_ISUPPORTS NS_DECL_NSICACHESERVICE nsCacheService(); virtual ~nsCacheService(); // Define a Create method to be used with a factory: static nsresult Create(nsISupports* outer, const nsIID& iid, void* *result); /** * Methods called by nsCacheSession */ static nsresult OpenCacheEntry(nsCacheSession * session, const nsACString & key, nsCacheAccessMode accessRequested, bool blockingMode, nsICacheListener * listener, nsICacheEntryDescriptor ** result); static nsresult EvictEntriesForSession(nsCacheSession * session); static nsresult IsStorageEnabledForPolicy(nsCacheStoragePolicy storagePolicy, bool * result); /** * Methods called by nsCacheEntryDescriptor */ static void CloseDescriptor(nsCacheEntryDescriptor * descriptor); static nsresult GetFileForEntry(nsCacheEntry * entry, nsIFile ** result); static nsresult OpenInputStreamForEntry(nsCacheEntry * entry, nsCacheAccessMode mode, PRUint32 offset, nsIInputStream ** result); static nsresult OpenOutputStreamForEntry(nsCacheEntry * entry, nsCacheAccessMode mode, PRUint32 offset, nsIOutputStream ** result); static nsresult OnDataSizeChange(nsCacheEntry * entry, PRInt32 deltaSize); static nsresult SetCacheElement(nsCacheEntry * entry, nsISupports * element); static nsresult ValidateEntry(nsCacheEntry * entry); static PRInt32 CacheCompressionLevel(); /** * Methods called by any cache classes */ static nsCacheService * GlobalInstance() { return gService; } static PRInt64 MemoryDeviceSize(); static nsresult DoomEntry(nsCacheEntry * entry); static bool IsStorageEnabledForPolicy_Locked(nsCacheStoragePolicy policy); // This method may be called to release an object while the cache service // lock is being held. If a non-null target is specified and the target // does not correspond to the current thread, then the release will be // proxied to the specified target. Otherwise, the object will be added to // the list of objects to be released when the cache service is unlocked. static void ReleaseObject_Locked(nsISupports * object, nsIEventTarget * target = nsnull); static nsresult DispatchToCacheIOThread(nsIRunnable* event); // Calling this method will block the calling thread until all pending // events on the cache-io thread has finished. The calling thread must // hold the cache-lock static nsresult SyncWithCacheIOThread(); /** * Methods called by nsCacheProfilePrefObserver */ static void OnProfileShutdown(bool cleanse); static void OnProfileChanged(); static void SetDiskCacheEnabled(bool enabled); // Sets the disk cache capacity (in kilobytes) static void SetDiskCacheCapacity(PRInt32 capacity); // Set max size for a disk-cache entry (in KB). -1 disables limit up to // 1/8th of disk cache size static void SetDiskCacheMaxEntrySize(PRInt32 maxSize); // Set max size for a memory-cache entry (in kilobytes). -1 disables // limit up to 90% of memory cache size static void SetMemoryCacheMaxEntrySize(PRInt32 maxSize); static void SetOfflineCacheEnabled(bool enabled); // Sets the offline cache capacity (in kilobytes) static void SetOfflineCacheCapacity(PRInt32 capacity); static void SetMemoryCache(); static void SetCacheCompressionLevel(PRInt32 level); static void OnEnterExitPrivateBrowsing(); // Starts smart cache size computation if disk device is available static nsresult SetDiskSmartSize(); nsresult Init(); void Shutdown(); static void AssertOwnsLock() { gService->mLock.AssertCurrentThreadOwns(); } private: friend class nsCacheServiceAutoLock; friend class nsOfflineCacheDevice; friend class nsProcessRequestEvent; friend class nsSetSmartSizeEvent; friend class nsBlockOnCacheThreadEvent; /** * Internal Methods */ static void Lock(); static void Unlock(); nsresult CreateDiskDevice(); nsresult CreateOfflineDevice(); nsresult CreateMemoryDevice(); nsresult CreateRequest(nsCacheSession * session, const nsACString & clientKey, nsCacheAccessMode accessRequested, bool blockingMode, nsICacheListener * listener, nsCacheRequest ** request); nsresult DoomEntry_Internal(nsCacheEntry * entry, bool doProcessPendingRequests); nsresult EvictEntriesForClient(const char * clientID, nsCacheStoragePolicy storagePolicy); // Notifies request listener asynchronously on the request's thread, and // releases the descriptor on the request's thread. If this method fails, // the descriptor is not released. nsresult NotifyListener(nsCacheRequest * request, nsICacheEntryDescriptor * descriptor, nsCacheAccessMode accessGranted, nsresult error); nsresult ActivateEntry(nsCacheRequest * request, nsCacheEntry ** entry, nsCacheEntry ** doomedEntry); nsCacheDevice * EnsureEntryHasDevice(nsCacheEntry * entry); nsCacheEntry * SearchCacheDevices(nsCString * key, nsCacheStoragePolicy policy, bool *collision); void DeactivateEntry(nsCacheEntry * entry); nsresult ProcessRequest(nsCacheRequest * request, bool calledFromOpenCacheEntry, nsICacheEntryDescriptor ** result); nsresult ProcessPendingRequests(nsCacheEntry * entry); void ClearPendingRequests(nsCacheEntry * entry); void ClearDoomList(void); void ClearActiveEntries(void); void DoomActiveEntries(void); static PLDHashOperator DeactivateAndClearEntry(PLDHashTable * table, PLDHashEntryHdr * hdr, PRUint32 number, void * arg); static PLDHashOperator RemoveActiveEntry(PLDHashTable * table, PLDHashEntryHdr * hdr, PRUint32 number, void * arg); #if defined(PR_LOGGING) void LogCacheStatistics(); #endif nsresult SetDiskSmartSize_Locked(bool checkPref); /** * Data Members */ static nsCacheService * gService; // there can be only one... nsCacheProfilePrefObserver * mObserver; mozilla::Mutex mLock; mozilla::CondVar mCondVar; nsCOMPtr mCacheIOThread; nsTArray mDoomedObjects; bool mInitialized; bool mEnableMemoryDevice; bool mEnableDiskDevice; bool mEnableOfflineDevice; nsMemoryCacheDevice * mMemoryDevice; nsDiskCacheDevice * mDiskDevice; nsOfflineCacheDevice * mOfflineDevice; nsCacheEntryHashTable mActiveEntries; PRCList mDoomedEntries; // stats PRUint32 mTotalEntries; PRUint32 mCacheHits; PRUint32 mCacheMisses; PRUint32 mMaxKeyLength; PRUint32 mMaxDataSize; PRUint32 mMaxMetaSize; // Unexpected error totals PRUint32 mDeactivateFailures; PRUint32 mDeactivatedUnboundEntries; }; /****************************************************************************** * nsCacheServiceAutoLock ******************************************************************************/ // Instantiate this class to acquire the cache service lock for a particular // execution scope. class nsCacheServiceAutoLock { public: nsCacheServiceAutoLock() { nsCacheService::Lock(); } ~nsCacheServiceAutoLock() { nsCacheService::Unlock(); } }; #endif // _nsCacheService_h_