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328 lines
12 KiB
C++
328 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsCacheService.h, released
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* February 10, 2001.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gordon Sheridan <gordon@netscape.com>
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* Patrick C. Beard <beard@netscape.com>
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* Darin Fisher <darin@netscape.com>
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* Ehsan Akhgari <ehsan.akhgari@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef _nsCacheService_h_
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#define _nsCacheService_h_
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#include "nsICacheService.h"
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#include "nsCacheSession.h"
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#include "nsCacheDevice.h"
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#include "nsCacheEntry.h"
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#include "prthread.h"
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#include "nsIObserver.h"
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#include "nsString.h"
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#include "nsTArray.h"
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#include "mozilla/CondVar.h"
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#include "mozilla/Mutex.h"
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class nsCacheRequest;
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class nsCacheProfilePrefObserver;
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class nsDiskCacheDevice;
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class nsMemoryCacheDevice;
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class nsOfflineCacheDevice;
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class nsCacheServiceAutoLock;
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/******************************************************************************
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* nsCacheService
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******************************************************************************/
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class nsCacheService : public nsICacheService
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSICACHESERVICE
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nsCacheService();
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virtual ~nsCacheService();
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// Define a Create method to be used with a factory:
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static nsresult
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Create(nsISupports* outer, const nsIID& iid, void* *result);
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/**
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* Methods called by nsCacheSession
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*/
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static nsresult OpenCacheEntry(nsCacheSession * session,
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const nsACString & key,
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nsCacheAccessMode accessRequested,
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bool blockingMode,
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nsICacheListener * listener,
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nsICacheEntryDescriptor ** result);
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static nsresult EvictEntriesForSession(nsCacheSession * session);
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static nsresult IsStorageEnabledForPolicy(nsCacheStoragePolicy storagePolicy,
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bool * result);
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/**
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* Methods called by nsCacheEntryDescriptor
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*/
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static void CloseDescriptor(nsCacheEntryDescriptor * descriptor);
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static nsresult GetFileForEntry(nsCacheEntry * entry,
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nsIFile ** result);
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static nsresult OpenInputStreamForEntry(nsCacheEntry * entry,
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nsCacheAccessMode mode,
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PRUint32 offset,
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nsIInputStream ** result);
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static nsresult OpenOutputStreamForEntry(nsCacheEntry * entry,
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nsCacheAccessMode mode,
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PRUint32 offset,
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nsIOutputStream ** result);
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static nsresult OnDataSizeChange(nsCacheEntry * entry, PRInt32 deltaSize);
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static nsresult SetCacheElement(nsCacheEntry * entry, nsISupports * element);
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static nsresult ValidateEntry(nsCacheEntry * entry);
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static PRInt32 CacheCompressionLevel();
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/**
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* Methods called by any cache classes
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*/
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static
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nsCacheService * GlobalInstance() { return gService; }
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static
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PRInt64 MemoryDeviceSize();
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static nsresult DoomEntry(nsCacheEntry * entry);
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static bool IsStorageEnabledForPolicy_Locked(nsCacheStoragePolicy policy);
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// This method may be called to release an object while the cache service
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// lock is being held. If a non-null target is specified and the target
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// does not correspond to the current thread, then the release will be
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// proxied to the specified target. Otherwise, the object will be added to
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// the list of objects to be released when the cache service is unlocked.
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static void ReleaseObject_Locked(nsISupports * object,
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nsIEventTarget * target = nsnull);
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static nsresult DispatchToCacheIOThread(nsIRunnable* event);
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// Calling this method will block the calling thread until all pending
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// events on the cache-io thread has finished. The calling thread must
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// hold the cache-lock
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static nsresult SyncWithCacheIOThread();
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/**
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* Methods called by nsCacheProfilePrefObserver
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*/
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static void OnProfileShutdown(bool cleanse);
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static void OnProfileChanged();
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static void SetDiskCacheEnabled(bool enabled);
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// Sets the disk cache capacity (in kilobytes)
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static void SetDiskCacheCapacity(PRInt32 capacity);
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// Set max size for a disk-cache entry (in KB). -1 disables limit up to
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// 1/8th of disk cache size
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static void SetDiskCacheMaxEntrySize(PRInt32 maxSize);
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// Set max size for a memory-cache entry (in kilobytes). -1 disables
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// limit up to 90% of memory cache size
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static void SetMemoryCacheMaxEntrySize(PRInt32 maxSize);
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static void SetOfflineCacheEnabled(bool enabled);
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// Sets the offline cache capacity (in kilobytes)
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static void SetOfflineCacheCapacity(PRInt32 capacity);
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static void SetMemoryCache();
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static void SetCacheCompressionLevel(PRInt32 level);
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static void OnEnterExitPrivateBrowsing();
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// Starts smart cache size computation if disk device is available
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static nsresult SetDiskSmartSize();
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nsresult Init();
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void Shutdown();
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static void AssertOwnsLock()
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{ gService->mLock.AssertCurrentThreadOwns(); }
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private:
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friend class nsCacheServiceAutoLock;
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friend class nsOfflineCacheDevice;
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friend class nsProcessRequestEvent;
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friend class nsSetSmartSizeEvent;
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friend class nsBlockOnCacheThreadEvent;
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/**
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* Internal Methods
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*/
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static void Lock();
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static void Unlock();
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nsresult CreateDiskDevice();
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nsresult CreateOfflineDevice();
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nsresult CreateMemoryDevice();
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nsresult CreateRequest(nsCacheSession * session,
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const nsACString & clientKey,
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nsCacheAccessMode accessRequested,
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bool blockingMode,
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nsICacheListener * listener,
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nsCacheRequest ** request);
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nsresult DoomEntry_Internal(nsCacheEntry * entry,
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bool doProcessPendingRequests);
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nsresult EvictEntriesForClient(const char * clientID,
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nsCacheStoragePolicy storagePolicy);
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// Notifies request listener asynchronously on the request's thread, and
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// releases the descriptor on the request's thread. If this method fails,
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// the descriptor is not released.
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nsresult NotifyListener(nsCacheRequest * request,
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nsICacheEntryDescriptor * descriptor,
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nsCacheAccessMode accessGranted,
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nsresult error);
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nsresult ActivateEntry(nsCacheRequest * request,
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nsCacheEntry ** entry,
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nsCacheEntry ** doomedEntry);
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nsCacheDevice * EnsureEntryHasDevice(nsCacheEntry * entry);
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nsCacheEntry * SearchCacheDevices(nsCString * key, nsCacheStoragePolicy policy, bool *collision);
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void DeactivateEntry(nsCacheEntry * entry);
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nsresult ProcessRequest(nsCacheRequest * request,
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bool calledFromOpenCacheEntry,
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nsICacheEntryDescriptor ** result);
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nsresult ProcessPendingRequests(nsCacheEntry * entry);
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void ClearPendingRequests(nsCacheEntry * entry);
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void ClearDoomList(void);
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void ClearActiveEntries(void);
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void DoomActiveEntries(void);
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static
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PLDHashOperator DeactivateAndClearEntry(PLDHashTable * table,
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PLDHashEntryHdr * hdr,
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PRUint32 number,
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void * arg);
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static
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PLDHashOperator RemoveActiveEntry(PLDHashTable * table,
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PLDHashEntryHdr * hdr,
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PRUint32 number,
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void * arg);
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#if defined(PR_LOGGING)
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void LogCacheStatistics();
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#endif
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nsresult SetDiskSmartSize_Locked(bool checkPref);
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/**
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* Data Members
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*/
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static nsCacheService * gService; // there can be only one...
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nsCacheProfilePrefObserver * mObserver;
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mozilla::Mutex mLock;
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mozilla::CondVar mCondVar;
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nsCOMPtr<nsIThread> mCacheIOThread;
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nsTArray<nsISupports*> mDoomedObjects;
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bool mInitialized;
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bool mEnableMemoryDevice;
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bool mEnableDiskDevice;
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bool mEnableOfflineDevice;
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nsMemoryCacheDevice * mMemoryDevice;
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nsDiskCacheDevice * mDiskDevice;
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nsOfflineCacheDevice * mOfflineDevice;
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nsCacheEntryHashTable mActiveEntries;
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PRCList mDoomedEntries;
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// stats
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PRUint32 mTotalEntries;
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PRUint32 mCacheHits;
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PRUint32 mCacheMisses;
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PRUint32 mMaxKeyLength;
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PRUint32 mMaxDataSize;
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PRUint32 mMaxMetaSize;
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// Unexpected error totals
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PRUint32 mDeactivateFailures;
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PRUint32 mDeactivatedUnboundEntries;
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};
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/******************************************************************************
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* nsCacheServiceAutoLock
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******************************************************************************/
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// Instantiate this class to acquire the cache service lock for a particular
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// execution scope.
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class nsCacheServiceAutoLock {
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public:
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nsCacheServiceAutoLock() {
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nsCacheService::Lock();
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}
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~nsCacheServiceAutoLock() {
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nsCacheService::Unlock();
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}
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};
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#endif // _nsCacheService_h_
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