tenfourfox/netwerk/cache/nsCacheService.h

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2017-04-19 07:56:45 +00:00
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=4 et sw=4 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef _nsCacheService_h_
#define _nsCacheService_h_
#include "nsICacheService.h"
#include "nsCacheSession.h"
#include "nsCacheDevice.h"
#include "nsCacheEntry.h"
#include "nsThreadUtils.h"
#include "nsICacheListener.h"
#include "nsIMemoryReporter.h"
#include "prthread.h"
#include "nsIObserver.h"
#include "nsString.h"
#include "nsTArray.h"
#include "nsRefPtrHashtable.h"
#include "mozilla/CondVar.h"
#include "mozilla/Mutex.h"
#include "mozilla/Telemetry.h"
class nsCacheRequest;
class nsCacheProfilePrefObserver;
class nsDiskCacheDevice;
class nsMemoryCacheDevice;
class nsOfflineCacheDevice;
class nsCacheServiceAutoLock;
class nsITimer;
class mozIStorageService;
/******************************************************************************
* nsNotifyDoomListener
*****************************************************************************/
class nsNotifyDoomListener : public nsRunnable {
public:
nsNotifyDoomListener(nsICacheListener *listener,
nsresult status)
: mListener(listener) // transfers reference
, mStatus(status)
{}
NS_IMETHOD Run()
{
mListener->OnCacheEntryDoomed(mStatus);
NS_RELEASE(mListener);
return NS_OK;
}
private:
nsICacheListener *mListener;
nsresult mStatus;
};
/******************************************************************************
* nsCacheService
******************************************************************************/
class nsCacheService final : public nsICacheServiceInternal,
public nsIMemoryReporter
{
virtual ~nsCacheService();
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSICACHESERVICE
NS_DECL_NSICACHESERVICEINTERNAL
NS_DECL_NSIMEMORYREPORTER
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);
static nsresult DoomEntry(nsCacheSession *session,
const nsACString &key,
nsICacheListener *listener);
/**
* Methods called by nsCacheEntryDescriptor
*/
static void CloseDescriptor(nsCacheEntryDescriptor * descriptor);
static nsresult GetFileForEntry(nsCacheEntry * entry,
nsIFile ** result);
static nsresult OpenInputStreamForEntry(nsCacheEntry * entry,
nsCacheAccessMode mode,
uint32_t offset,
nsIInputStream ** result);
static nsresult OpenOutputStreamForEntry(nsCacheEntry * entry,
nsCacheAccessMode mode,
uint32_t offset,
nsIOutputStream ** result);
static nsresult OnDataSizeChange(nsCacheEntry * entry, int32_t deltaSize);
static nsresult SetCacheElement(nsCacheEntry * entry, nsISupports * element);
static nsresult ValidateEntry(nsCacheEntry * entry);
static int32_t CacheCompressionLevel();
static bool GetClearingEntries();
static void GetCacheBaseDirectoty(nsIFile ** result);
static void GetDiskCacheDirectory(nsIFile ** result);
static void GetAppCacheDirectory(nsIFile ** result);
/**
* Methods called by any cache classes
*/
static
nsCacheService * GlobalInstance() { return gService; }
static nsresult DoomEntry(nsCacheEntry * entry);
static bool IsStorageEnabledForPolicy_Locked(nsCacheStoragePolicy policy);
/**
* Called by disk cache to notify us to use the new max smart size
*/
static void MarkStartingFresh();
/**
* Methods called by nsApplicationCacheService
*/
nsresult GetOfflineDevice(nsOfflineCacheDevice ** aDevice);
/**
* Creates an offline cache device that works over a specific profile directory.
* A tool to preload offline cache for profiles different from the current
* application's profile directory.
*/
nsresult GetCustomOfflineDevice(nsIFile *aProfileDir,
int32_t aQuota,
nsOfflineCacheDevice **aDevice);
// 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 = nullptr);
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();
static void OnProfileChanged();
static void SetDiskCacheEnabled(bool enabled);
// Sets the disk cache capacity (in kilobytes)
static void SetDiskCacheCapacity(int32_t 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(int32_t maxSize);
// Set max size for a memory-cache entry (in kilobytes). -1 disables
// limit up to 90% of memory cache size
static void SetMemoryCacheMaxEntrySize(int32_t maxSize);
static void SetOfflineCacheEnabled(bool enabled);
// Sets the offline cache capacity (in kilobytes)
static void SetOfflineCacheCapacity(int32_t capacity);
static void SetMemoryCache();
static void SetCacheCompressionLevel(int32_t level);
// Starts smart cache size computation if disk device is available
static nsresult SetDiskSmartSize();
static void MoveOrRemoveDiskCache(nsIFile *aOldCacheDir,
nsIFile *aNewCacheDir,
const char *aCacheSubdir);
nsresult Init();
void Shutdown();
static bool IsInitialized()
{
if (!gService) {
return false;
}
return gService->mInitialized;
}
static void AssertOwnsLock()
{ gService->mLock.AssertCurrentThreadOwns(); }
static void LeavePrivateBrowsing();
bool IsDoomListEmpty();
typedef bool (*DoomCheckFn)(nsCacheEntry* entry);
// Accessors to the disabled functionality
nsresult CreateSessionInternal(const char * clientID,
nsCacheStoragePolicy storagePolicy,
bool streamBased,
nsICacheSession **result);
nsresult VisitEntriesInternal(nsICacheVisitor *visitor);
nsresult EvictEntriesInternal(nsCacheStoragePolicy storagePolicy);
private:
friend class nsCacheServiceAutoLock;
friend class nsOfflineCacheDevice;
friend class nsProcessRequestEvent;
friend class nsSetSmartSizeEvent;
friend class nsBlockOnCacheThreadEvent;
friend class nsSetDiskSmartSizeCallback;
friend class nsDoomEvent;
friend class nsDisableOldMaxSmartSizePrefEvent;
friend class nsDiskCacheMap;
friend class nsAsyncDoomEvent;
friend class nsCacheEntryDescriptor;
/**
* Internal Methods
*/
static void Lock();
static void Lock(::mozilla::Telemetry::ID mainThreadLockerID);
static void Unlock();
void LockAcquired();
void LockReleased();
nsresult CreateDiskDevice();
nsresult CreateOfflineDevice();
nsresult CreateCustomOfflineDevice(nsIFile *aProfileDir,
int32_t aQuota,
nsOfflineCacheDevice **aDevice);
nsresult CreateMemoryDevice();
nsresult RemoveCustomOfflineDevice(nsOfflineCacheDevice *aDevice);
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 ClearDoomList(void);
void DoomActiveEntries(DoomCheckFn check);
void CloseAllStreams();
void FireClearNetworkCacheStoredAnywhereNotification();
void LogCacheStatistics();
nsresult SetDiskSmartSize_Locked();
/**
* Data Members
*/
static nsCacheService * gService; // there can be only one...
nsCOMPtr<mozIStorageService> mStorageService;
nsCacheProfilePrefObserver * mObserver;
mozilla::Mutex mLock;
mozilla::CondVar mCondVar;
mozilla::Mutex mTimeStampLock;
mozilla::TimeStamp mLockAcquiredTimeStamp;
nsCOMPtr<nsIThread> mCacheIOThread;
nsTArray<nsISupports*> mDoomedObjects;
nsCOMPtr<nsITimer> mSmartSizeTimer;
bool mInitialized;
bool mClearingEntries;
bool mEnableMemoryDevice;
bool mEnableDiskDevice;
bool mEnableOfflineDevice;
nsMemoryCacheDevice * mMemoryDevice;
nsDiskCacheDevice * mDiskDevice;
nsOfflineCacheDevice * mOfflineDevice;
nsRefPtrHashtable<nsStringHashKey, nsOfflineCacheDevice> mCustomOfflineDevices;
nsCacheEntryHashTable mActiveEntries;
PRCList mDoomedEntries;
// stats
uint32_t mTotalEntries;
uint32_t mCacheHits;
uint32_t mCacheMisses;
uint32_t mMaxKeyLength;
uint32_t mMaxDataSize;
uint32_t mMaxMetaSize;
// Unexpected error totals
uint32_t mDeactivateFailures;
uint32_t mDeactivatedUnboundEntries;
};
/******************************************************************************
* nsCacheServiceAutoLock
******************************************************************************/
#define LOCK_TELEM(x) \
(::mozilla::Telemetry::CACHE_SERVICE_LOCK_WAIT_MAINTHREAD_##x)
// Instantiate this class to acquire the cache service lock for a particular
// execution scope.
class nsCacheServiceAutoLock {
public:
nsCacheServiceAutoLock() {
nsCacheService::Lock();
}
explicit nsCacheServiceAutoLock(mozilla::Telemetry::ID mainThreadLockerID) {
nsCacheService::Lock(mainThreadLockerID);
}
~nsCacheServiceAutoLock() {
nsCacheService::Unlock();
}
};
#endif // _nsCacheService_h_