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pjs/netwerk/cache/nsCacheService.cpp

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66 KiB
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/* -*- 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.cpp, 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, 10-February-2001
* Michael Ventnor <m.ventnor@gmail.com>
* Ehsan Akhgari <ehsan.akhgari@gmail.com>
*
* 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 ***** */
#include "necko-config.h"
#include "nsCache.h"
#include "nsCacheService.h"
#include "nsCacheRequest.h"
#include "nsCacheEntry.h"
#include "nsCacheEntryDescriptor.h"
#include "nsCacheDevice.h"
#include "nsMemoryCacheDevice.h"
#include "nsICacheVisitor.h"
#include "nsDiskCacheDevice.h"
#ifdef NECKO_OFFLINE_CACHE
#include "nsDiskCacheDeviceSQL.h"
#endif
#include "nsIObserverService.h"
#include "nsIPrefService.h"
#include "nsIPrefBranch.h"
#include "nsIPrefBranch2.h"
#include "nsILocalFile.h"
#include "nsIOService.h"
#include "nsDirectoryServiceDefs.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsThreadUtils.h"
#include "nsProxyRelease.h"
#include "nsVoidArray.h"
#include "nsDeleteDir.h"
#include "nsIPrivateBrowsingService.h"
#include "nsNetCID.h"
#include <math.h> // for log()
#include "mozilla/Services.h"
#include "mozilla/FunctionTimer.h"
/******************************************************************************
* nsCacheProfilePrefObserver
*****************************************************************************/
#ifdef XP_MAC
#pragma mark nsCacheProfilePrefObserver
#endif
#define DISK_CACHE_ENABLE_PREF "browser.cache.disk.enable"
#define DISK_CACHE_DIR_PREF "browser.cache.disk.parent_directory"
#define DISK_CACHE_CAPACITY_PREF "browser.cache.disk.capacity"
#define DISK_CACHE_MAX_ENTRY_SIZE_PREF "browser.cache.disk.max_entry_size"
#define DISK_CACHE_CAPACITY 51200
#define OFFLINE_CACHE_ENABLE_PREF "browser.cache.offline.enable"
#define OFFLINE_CACHE_DIR_PREF "browser.cache.offline.parent_directory"
#define OFFLINE_CACHE_CAPACITY_PREF "browser.cache.offline.capacity"
#define OFFLINE_CACHE_CAPACITY 512000
#define MEMORY_CACHE_ENABLE_PREF "browser.cache.memory.enable"
#define MEMORY_CACHE_CAPACITY_PREF "browser.cache.memory.capacity"
#define MEMORY_CACHE_MAX_ENTRY_SIZE_PREF "browser.cache.memory.max_entry_size"
static const char * observerList[] = {
"profile-before-change",
"profile-after-change",
NS_XPCOM_SHUTDOWN_OBSERVER_ID,
NS_PRIVATE_BROWSING_SWITCH_TOPIC
};
static const char * prefList[] = {
#ifdef NECKO_DISK_CACHE
DISK_CACHE_ENABLE_PREF,
DISK_CACHE_CAPACITY_PREF,
DISK_CACHE_DIR_PREF,
#endif
#ifdef NECKO_OFFLINE_CACHE
OFFLINE_CACHE_ENABLE_PREF,
OFFLINE_CACHE_CAPACITY_PREF,
OFFLINE_CACHE_DIR_PREF,
#endif
MEMORY_CACHE_ENABLE_PREF,
MEMORY_CACHE_CAPACITY_PREF
};
class nsCacheProfilePrefObserver : public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
nsCacheProfilePrefObserver()
: mHaveProfile(PR_FALSE)
, mDiskCacheEnabled(PR_FALSE)
, mDiskCacheCapacity(0)
, mOfflineCacheEnabled(PR_FALSE)
, mOfflineCacheCapacity(0)
, mMemoryCacheEnabled(PR_TRUE)
, mMemoryCacheCapacity(-1)
, mInPrivateBrowsing(PR_FALSE)
{
}
virtual ~nsCacheProfilePrefObserver() {}
nsresult Install();
void Remove();
nsresult ReadPrefs(nsIPrefBranch* branch);
PRBool DiskCacheEnabled();
PRInt32 DiskCacheCapacity() { return mDiskCacheCapacity; }
nsILocalFile * DiskCacheParentDirectory() { return mDiskCacheParentDirectory; }
PRBool OfflineCacheEnabled();
PRInt32 OfflineCacheCapacity() { return mOfflineCacheCapacity; }
nsILocalFile * OfflineCacheParentDirectory() { return mOfflineCacheParentDirectory; }
PRBool MemoryCacheEnabled();
PRInt32 MemoryCacheCapacity();
private:
PRBool mHaveProfile;
PRBool mDiskCacheEnabled;
PRInt32 mDiskCacheCapacity; // in kilobytes
nsCOMPtr<nsILocalFile> mDiskCacheParentDirectory;
PRBool mOfflineCacheEnabled;
PRInt32 mOfflineCacheCapacity; // in kilobytes
nsCOMPtr<nsILocalFile> mOfflineCacheParentDirectory;
PRBool mMemoryCacheEnabled;
PRInt32 mMemoryCacheCapacity; // in kilobytes
PRBool mInPrivateBrowsing;
};
NS_IMPL_ISUPPORTS1(nsCacheProfilePrefObserver, nsIObserver)
nsresult
nsCacheProfilePrefObserver::Install()
{
// install profile-change observer
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (!observerService)
return NS_ERROR_FAILURE;
nsresult rv, rv2 = NS_OK;
for (unsigned int i=0; i<NS_ARRAY_LENGTH(observerList); i++) {
rv = observerService->AddObserver(this, observerList[i], PR_FALSE);
if (NS_FAILED(rv))
rv2 = rv;
}
// install preferences observer
nsCOMPtr<nsIPrefBranch2> branch = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!branch) return NS_ERROR_FAILURE;
for (unsigned int i=0; i<NS_ARRAY_LENGTH(prefList); i++) {
rv = branch->AddObserver(prefList[i], this, PR_FALSE);
if (NS_FAILED(rv))
rv2 = rv;
}
// determine the initial status of the private browsing mode
nsCOMPtr<nsIPrivateBrowsingService> pbs =
do_GetService(NS_PRIVATE_BROWSING_SERVICE_CONTRACTID);
if (pbs)
pbs->GetPrivateBrowsingEnabled(&mInPrivateBrowsing);
// Determine if we have a profile already
// Install() is called *after* the profile-after-change notification
// when there is only a single profile, or it is specified on the
// commandline at startup.
// In that case, we detect the presence of a profile by the existence
// of the NS_APP_USER_PROFILE_50_DIR directory.
nsCOMPtr<nsIFile> directory;
rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(directory));
if (NS_SUCCEEDED(rv))
mHaveProfile = PR_TRUE;
rv = ReadPrefs(branch);
NS_ENSURE_SUCCESS(rv, rv);
return rv2;
}
void
nsCacheProfilePrefObserver::Remove()
{
// remove Observer Service observers
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (obs) {
for (unsigned int i=0; i<NS_ARRAY_LENGTH(observerList); i++) {
obs->RemoveObserver(this, observerList[i]);
}
}
// remove Pref Service observers
nsCOMPtr<nsIPrefBranch2> prefs =
do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!prefs)
return;
for (unsigned int i=0; i<NS_ARRAY_LENGTH(prefList); i++)
prefs->RemoveObserver(prefList[i], this); // remove cache pref observers
}
NS_IMETHODIMP
nsCacheProfilePrefObserver::Observe(nsISupports * subject,
const char * topic,
const PRUnichar * data_unicode)
{
nsresult rv;
NS_ConvertUTF16toUTF8 data(data_unicode);
CACHE_LOG_ALWAYS(("Observe [topic=%s data=%s]\n", topic, data.get()));
if (!strcmp(NS_XPCOM_SHUTDOWN_OBSERVER_ID, topic)) {
// xpcom going away, shutdown cache service
if (nsCacheService::GlobalInstance())
nsCacheService::GlobalInstance()->Shutdown();
} else if (!strcmp("profile-before-change", topic)) {
// profile before change
mHaveProfile = PR_FALSE;
// XXX shutdown devices
nsCacheService::OnProfileShutdown(!strcmp("shutdown-cleanse",
data.get()));
} else if (!strcmp("profile-after-change", topic)) {
// profile after change
mHaveProfile = PR_TRUE;
nsCOMPtr<nsIPrefBranch> branch = do_GetService(NS_PREFSERVICE_CONTRACTID);
ReadPrefs(branch);
nsCacheService::OnProfileChanged();
} else if (!strcmp(NS_PREFBRANCH_PREFCHANGE_TOPIC_ID, topic)) {
// ignore pref changes until we're done switch profiles
if (!mHaveProfile) return NS_OK;
nsCOMPtr<nsIPrefBranch> branch = do_QueryInterface(subject, &rv);
if (NS_FAILED(rv)) return rv;
#ifdef NECKO_DISK_CACHE
// which preference changed?
if (!strcmp(DISK_CACHE_ENABLE_PREF, data.get())) {
if (!mInPrivateBrowsing) {
rv = branch->GetBoolPref(DISK_CACHE_ENABLE_PREF,
&mDiskCacheEnabled);
if (NS_FAILED(rv)) return rv;
nsCacheService::SetDiskCacheEnabled(DiskCacheEnabled());
}
} else if (!strcmp(DISK_CACHE_CAPACITY_PREF, data.get())) {
PRInt32 capacity = 0;
rv = branch->GetIntPref(DISK_CACHE_CAPACITY_PREF, &capacity);
if (NS_FAILED(rv)) return rv;
mDiskCacheCapacity = PR_MAX(0, capacity);
nsCacheService::SetDiskCacheCapacity(mDiskCacheCapacity);
#if 0
} else if (!strcmp(DISK_CACHE_DIR_PREF, data.get())) {
// XXX We probaby don't want to respond to this pref except after
// XXX profile changes. Ideally, there should be somekind of user
// XXX notification that the pref change won't take effect until
// XXX the next time the profile changes (browser launch)
#endif
} else
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
// which preference changed?
if (!strcmp(OFFLINE_CACHE_ENABLE_PREF, data.get())) {
if (!mInPrivateBrowsing) {
rv = branch->GetBoolPref(OFFLINE_CACHE_ENABLE_PREF,
&mOfflineCacheEnabled);
if (NS_FAILED(rv)) return rv;
nsCacheService::SetOfflineCacheEnabled(OfflineCacheEnabled());
}
} else if (!strcmp(OFFLINE_CACHE_CAPACITY_PREF, data.get())) {
PRInt32 capacity = 0;
rv = branch->GetIntPref(OFFLINE_CACHE_CAPACITY_PREF, &capacity);
if (NS_FAILED(rv)) return rv;
mOfflineCacheCapacity = PR_MAX(0, capacity);
nsCacheService::SetOfflineCacheCapacity(mOfflineCacheCapacity);
#if 0
} else if (!strcmp(OFFLINE_CACHE_DIR_PREF, data.get())) {
// XXX We probaby don't want to respond to this pref except after
// XXX profile changes. Ideally, there should be some kind of user
// XXX notification that the pref change won't take effect until
// XXX the next time the profile changes (browser launch)
#endif
} else
#endif // !NECKO_OFFLINE_CACHE
if (!strcmp(MEMORY_CACHE_ENABLE_PREF, data.get())) {
rv = branch->GetBoolPref(MEMORY_CACHE_ENABLE_PREF,
&mMemoryCacheEnabled);
if (NS_FAILED(rv)) return rv;
nsCacheService::SetMemoryCache();
} else if (!strcmp(MEMORY_CACHE_CAPACITY_PREF, data.get())) {
mMemoryCacheCapacity = -1;
(void) branch->GetIntPref(MEMORY_CACHE_CAPACITY_PREF,
&mMemoryCacheCapacity);
nsCacheService::SetMemoryCache();
}
} else if (!strcmp(NS_PRIVATE_BROWSING_SWITCH_TOPIC, topic)) {
if (!strcmp(NS_PRIVATE_BROWSING_ENTER, data.get())) {
mInPrivateBrowsing = PR_TRUE;
nsCacheService::OnEnterExitPrivateBrowsing();
#ifdef NECKO_DISK_CACHE
mDiskCacheEnabled = PR_FALSE;
nsCacheService::SetDiskCacheEnabled(DiskCacheEnabled());
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
mOfflineCacheEnabled = PR_FALSE;
nsCacheService::SetOfflineCacheEnabled(OfflineCacheEnabled());
#endif // !NECKO_OFFLINE_CACHE
} else if (!strcmp(NS_PRIVATE_BROWSING_LEAVE, data.get())) {
mInPrivateBrowsing = PR_FALSE;
nsCacheService::OnEnterExitPrivateBrowsing();
#if defined(NECKO_DISK_CACHE) || defined(NECKO_OFFLINE_CACHE)
nsCOMPtr<nsIPrefBranch> branch = do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
#endif // !NECKO_DISK_CACHE && !NECKO_OFFLINE_CACHE
#ifdef NECKO_DISK_CACHE
mDiskCacheEnabled = PR_TRUE; // by default enabled
(void) branch->GetBoolPref(DISK_CACHE_ENABLE_PREF,
&mDiskCacheEnabled);
nsCacheService::SetDiskCacheEnabled(DiskCacheEnabled());
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
mOfflineCacheEnabled = PR_TRUE; // by default enabled
(void) branch->GetBoolPref(OFFLINE_CACHE_ENABLE_PREF,
&mOfflineCacheEnabled);
nsCacheService::SetOfflineCacheEnabled(OfflineCacheEnabled());
#endif // !NECKO_OFFLINE_CACHE
}
}
return NS_OK;
}
nsresult
nsCacheProfilePrefObserver::ReadPrefs(nsIPrefBranch* branch)
{
nsresult rv = NS_OK;
#ifdef NECKO_DISK_CACHE
// read disk cache device prefs
if (!mInPrivateBrowsing) {
mDiskCacheEnabled = PR_TRUE; // presume disk cache is enabled
(void) branch->GetBoolPref(DISK_CACHE_ENABLE_PREF, &mDiskCacheEnabled);
}
mDiskCacheCapacity = DISK_CACHE_CAPACITY;
(void)branch->GetIntPref(DISK_CACHE_CAPACITY_PREF, &mDiskCacheCapacity);
mDiskCacheCapacity = PR_MAX(0, mDiskCacheCapacity);
(void) branch->GetComplexValue(DISK_CACHE_DIR_PREF, // ignore error
NS_GET_IID(nsILocalFile),
getter_AddRefs(mDiskCacheParentDirectory));
if (!mDiskCacheParentDirectory) {
nsCOMPtr<nsIFile> directory;
// try to get the disk cache parent directory
rv = NS_GetSpecialDirectory(NS_APP_CACHE_PARENT_DIR,
getter_AddRefs(directory));
if (NS_FAILED(rv)) {
// try to get the profile directory (there may not be a profile yet)
nsCOMPtr<nsIFile> profDir;
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(profDir));
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_LOCAL_50_DIR,
getter_AddRefs(directory));
if (!directory)
directory = profDir;
else if (profDir) {
PRBool same;
if (NS_SUCCEEDED(profDir->Equals(directory, &same)) && !same) {
// We no longer store the cache directory in the main
// profile directory, so we should cleanup the old one.
rv = profDir->AppendNative(NS_LITERAL_CSTRING("Cache"));
if (NS_SUCCEEDED(rv)) {
PRBool exists;
if (NS_SUCCEEDED(profDir->Exists(&exists)) && exists)
DeleteDir(profDir, PR_FALSE, PR_FALSE);
}
}
}
}
// use file cache in build tree only if asked, to avoid cache dir litter
if (!directory && PR_GetEnv("NECKO_DEV_ENABLE_DISK_CACHE")) {
rv = NS_GetSpecialDirectory(NS_XPCOM_CURRENT_PROCESS_DIR,
getter_AddRefs(directory));
}
if (directory)
mDiskCacheParentDirectory = do_QueryInterface(directory, &rv);
}
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
// read offline cache device prefs
if (!mInPrivateBrowsing) {
mOfflineCacheEnabled = PR_TRUE; // presume offline cache is enabled
(void) branch->GetBoolPref(OFFLINE_CACHE_ENABLE_PREF,
&mOfflineCacheEnabled);
}
mOfflineCacheCapacity = OFFLINE_CACHE_CAPACITY;
(void)branch->GetIntPref(OFFLINE_CACHE_CAPACITY_PREF,
&mOfflineCacheCapacity);
mOfflineCacheCapacity = PR_MAX(0, mOfflineCacheCapacity);
(void) branch->GetComplexValue(OFFLINE_CACHE_DIR_PREF, // ignore error
NS_GET_IID(nsILocalFile),
getter_AddRefs(mOfflineCacheParentDirectory));
if (!mOfflineCacheParentDirectory) {
nsCOMPtr<nsIFile> directory;
// try to get the offline cache parent directory
rv = NS_GetSpecialDirectory(NS_APP_CACHE_PARENT_DIR,
getter_AddRefs(directory));
if (NS_FAILED(rv)) {
// try to get the profile directory (there may not be a profile yet)
nsCOMPtr<nsIFile> profDir;
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(profDir));
NS_GetSpecialDirectory(NS_APP_USER_PROFILE_LOCAL_50_DIR,
getter_AddRefs(directory));
if (!directory)
directory = profDir;
}
#if DEBUG
if (!directory) {
// use current process directory during development
rv = NS_GetSpecialDirectory(NS_XPCOM_CURRENT_PROCESS_DIR,
getter_AddRefs(directory));
}
#endif
if (directory)
mOfflineCacheParentDirectory = do_QueryInterface(directory, &rv);
}
#endif // !NECKO_OFFLINE_CACHE
// read memory cache device prefs
(void) branch->GetBoolPref(MEMORY_CACHE_ENABLE_PREF, &mMemoryCacheEnabled);
mMemoryCacheCapacity = -1;
(void) branch->GetIntPref(MEMORY_CACHE_CAPACITY_PREF,
&mMemoryCacheCapacity);
return rv;
}
PRBool
nsCacheProfilePrefObserver::DiskCacheEnabled()
{
if ((mDiskCacheCapacity == 0) || (!mDiskCacheParentDirectory)) return PR_FALSE;
return mDiskCacheEnabled;
}
PRBool
nsCacheProfilePrefObserver::OfflineCacheEnabled()
{
if ((mOfflineCacheCapacity == 0) || (!mOfflineCacheParentDirectory))
return PR_FALSE;
return mOfflineCacheEnabled;
}
PRBool
nsCacheProfilePrefObserver::MemoryCacheEnabled()
{
if (mMemoryCacheCapacity == 0) return PR_FALSE;
return mMemoryCacheEnabled;
}
/**
* MemoryCacheCapacity
*
* If the browser.cache.memory.capacity preference is positive, we use that
* value for the amount of memory available for the cache.
*
* If browser.cache.memory.capacity is zero, the memory cache is disabled.
*
* If browser.cache.memory.capacity is negative or not present, we use a
* formula that grows less than linearly with the amount of system memory,
* with an upper limit on the cache size. No matter how much physical RAM is
* present, the default cache size would not exceed 32 MB. This maximum would
* apply only to systems with more than 4 GB of RAM (e.g. terminal servers)
*
* RAM Cache
* --- -----
* 32 Mb 2 Mb
* 64 Mb 4 Mb
* 128 Mb 6 Mb
* 256 Mb 10 Mb
* 512 Mb 14 Mb
* 1024 Mb 18 Mb
* 2048 Mb 24 Mb
* 4096 Mb 30 Mb
*
* The equation for this is (for cache size C and memory size K (kbytes)):
* x = log2(K) - 14
* C = x^2/3 + x + 2/3 + 0.1 (0.1 for rounding)
* if (C > 32) C = 32
*/
PRInt32
nsCacheProfilePrefObserver::MemoryCacheCapacity()
{
PRInt32 capacity = mMemoryCacheCapacity;
if (capacity >= 0) {
CACHE_LOG_DEBUG(("Memory cache capacity forced to %d\n", capacity));
return capacity;
}
static PRUint64 bytes = PR_GetPhysicalMemorySize();
CACHE_LOG_DEBUG(("Physical Memory size is %llu\n", bytes));
// If getting the physical memory failed, arbitrarily assume
// 32 MB of RAM. We use a low default to have a reasonable
// size on all the devices we support.
if (bytes == 0)
bytes = 32 * 1024 * 1024;
// Conversion from unsigned int64 to double doesn't work on all platforms.
// We need to truncate the value at LL_MAXINT to make sure we don't
// overflow.
if (LL_CMP(bytes, >, LL_MAXINT))
bytes = LL_MAXINT;
PRUint64 kbytes;
LL_SHR(kbytes, bytes, 10);
double kBytesD;
LL_L2D(kBytesD, (PRInt64) kbytes);
double x = log(kBytesD)/log(2.0) - 14;
if (x > 0) {
capacity = (PRInt32)(x * x / 3.0 + x + 2.0 / 3 + 0.1); // 0.1 for rounding
if (capacity > 32)
capacity = 32;
capacity *= 1024;
} else {
capacity = 0;
}
return capacity;
}
/******************************************************************************
* nsCacheService
*****************************************************************************/
#ifdef XP_MAC
#pragma mark -
#pragma mark nsCacheService
#endif
nsCacheService * nsCacheService::gService = nsnull;
NS_IMPL_THREADSAFE_ISUPPORTS1(nsCacheService, nsICacheService)
nsCacheService::nsCacheService()
: mLock(nsnull),
mInitialized(PR_FALSE),
mEnableMemoryDevice(PR_TRUE),
mEnableDiskDevice(PR_TRUE),
mMemoryDevice(nsnull),
mDiskDevice(nsnull),
mOfflineDevice(nsnull),
mTotalEntries(0),
mCacheHits(0),
mCacheMisses(0),
mMaxKeyLength(0),
mMaxDataSize(0),
mMaxMetaSize(0),
mDeactivateFailures(0),
mDeactivatedUnboundEntries(0)
{
NS_ASSERTION(gService==nsnull, "multiple nsCacheService instances!");
gService = this;
// create list of cache devices
PR_INIT_CLIST(&mDoomedEntries);
// allocate service lock
mLock = PR_NewLock();
#if defined(DEBUG)
mLockedThread = nsnull;
#endif
}
nsCacheService::~nsCacheService()
{
if (mInitialized) // Shutdown hasn't been called yet.
(void) Shutdown();
PR_DestroyLock(mLock);
gService = nsnull;
}
nsresult
nsCacheService::Init()
{
NS_TIME_FUNCTION;
NS_ASSERTION(!mInitialized, "nsCacheService already initialized.");
if (mInitialized)
return NS_ERROR_ALREADY_INITIALIZED;
if (mLock == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
CACHE_LOG_INIT();
// initialize hashtable for active cache entries
nsresult rv = mActiveEntries.Init();
if (NS_FAILED(rv)) return rv;
// create profile/preference observer
mObserver = new nsCacheProfilePrefObserver();
if (!mObserver) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(mObserver);
mObserver->Install();
mEnableDiskDevice = mObserver->DiskCacheEnabled();
mEnableOfflineDevice = mObserver->OfflineCacheEnabled();
mEnableMemoryDevice = mObserver->MemoryCacheEnabled();
mInitialized = PR_TRUE;
return NS_OK;
}
void
nsCacheService::Shutdown()
{
nsCacheServiceAutoLock lock;
NS_ASSERTION(mInitialized,
"can't shutdown nsCacheService unless it has been initialized.");
if (mInitialized) {
mInitialized = PR_FALSE;
mObserver->Remove();
NS_RELEASE(mObserver);
// Clear entries
ClearDoomList();
ClearActiveEntries();
// deallocate memory and disk caches
delete mMemoryDevice;
mMemoryDevice = nsnull;
#ifdef NECKO_DISK_CACHE
delete mDiskDevice;
mDiskDevice = nsnull;
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
NS_IF_RELEASE(mOfflineDevice);
#endif // !NECKO_OFFLINE_CACHE
#if defined(NECKO_DISK_CACHE) && defined(PR_LOGGING)
LogCacheStatistics();
#endif
}
}
nsresult
nsCacheService::Create(nsISupports* aOuter, const nsIID& aIID, void* *aResult)
{
nsresult rv;
if (aOuter != nsnull)
return NS_ERROR_NO_AGGREGATION;
nsCacheService * cacheService = new nsCacheService();
if (cacheService == nsnull)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(cacheService);
rv = cacheService->Init();
if (NS_SUCCEEDED(rv)) {
rv = cacheService->QueryInterface(aIID, aResult);
}
NS_RELEASE(cacheService);
return rv;
}
NS_IMETHODIMP
nsCacheService::CreateSession(const char * clientID,
nsCacheStoragePolicy storagePolicy,
PRBool streamBased,
nsICacheSession **result)
{
*result = nsnull;
if (this == nsnull) return NS_ERROR_NOT_AVAILABLE;
nsCacheSession * session = new nsCacheSession(clientID, storagePolicy, streamBased);
if (!session) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*result = session);
return NS_OK;
}
nsresult
nsCacheService::EvictEntriesForSession(nsCacheSession * session)
{
NS_ASSERTION(gService, "nsCacheService::gService is null.");
return gService->EvictEntriesForClient(session->ClientID()->get(),
session->StoragePolicy());
}
nsresult
nsCacheService::EvictEntriesForClient(const char * clientID,
nsCacheStoragePolicy storagePolicy)
{
if (this == nsnull) return NS_ERROR_NOT_AVAILABLE; // XXX eh?
nsCOMPtr<nsIObserverService> obsSvc =
mozilla::services::GetObserverService();
if (obsSvc) {
// Proxy to the UI thread since the observer service isn't thredsafe.
// We use an async proxy, since this it's not important whether this
// notification happens before or after the actual eviction.
nsCOMPtr<nsIObserverService> obsProxy;
NS_GetProxyForObject(NS_PROXY_TO_MAIN_THREAD,
NS_GET_IID(nsIObserverService), obsSvc,
NS_PROXY_ASYNC, getter_AddRefs(obsProxy));
if (obsProxy) {
obsProxy->NotifyObservers(this,
NS_CACHESERVICE_EMPTYCACHE_TOPIC_ID,
nsnull);
}
}
nsCacheServiceAutoLock lock;
nsresult res = NS_OK;
#ifdef NECKO_DISK_CACHE
if (storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_ON_DISK) {
if (mEnableDiskDevice) {
nsresult rv;
if (!mDiskDevice)
rv = CreateDiskDevice();
if (mDiskDevice)
rv = mDiskDevice->EvictEntries(clientID);
if (NS_FAILED(rv)) res = rv;
}
}
#endif // ! NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
// Only clear the offline cache if it has been specifically asked for.
if (storagePolicy == nsICache::STORE_OFFLINE) {
if (mEnableOfflineDevice) {
nsresult rv;
if (!mOfflineDevice)
rv = CreateOfflineDevice();
if (mOfflineDevice)
rv = mOfflineDevice->EvictEntries(clientID);
if (NS_FAILED(rv)) res = rv;
}
}
#endif // ! NECKO_OFFLINE_CACHE
if (storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_IN_MEMORY) {
// If there is no memory device, there is no need to evict it...
if (mMemoryDevice) {
nsresult rv;
rv = mMemoryDevice->EvictEntries(clientID);
if (NS_FAILED(rv)) res = rv;
}
}
return res;
}
nsresult
nsCacheService::IsStorageEnabledForPolicy(nsCacheStoragePolicy storagePolicy,
PRBool * result)
{
if (gService == nsnull) return NS_ERROR_NOT_AVAILABLE;
nsCacheServiceAutoLock lock;
*result = gService->IsStorageEnabledForPolicy_Locked(storagePolicy);
return NS_OK;
}
PRBool
nsCacheService::IsStorageEnabledForPolicy_Locked(nsCacheStoragePolicy storagePolicy)
{
if (gService->mEnableMemoryDevice &&
(storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_IN_MEMORY)) {
return PR_TRUE;
}
if (gService->mEnableDiskDevice &&
(storagePolicy == nsICache::STORE_ANYWHERE ||
storagePolicy == nsICache::STORE_ON_DISK ||
storagePolicy == nsICache::STORE_ON_DISK_AS_FILE)) {
return PR_TRUE;
}
if (gService->mEnableOfflineDevice &&
storagePolicy == nsICache::STORE_OFFLINE) {
return PR_TRUE;
}
return PR_FALSE;
}
NS_IMETHODIMP nsCacheService::VisitEntries(nsICacheVisitor *visitor)
{
NS_ENSURE_ARG_POINTER(visitor);
nsCacheServiceAutoLock lock;
if (!(mEnableDiskDevice || mEnableMemoryDevice))
return NS_ERROR_NOT_AVAILABLE;
// XXX record the fact that a visitation is in progress,
// XXX i.e. keep list of visitors in progress.
nsresult rv = NS_OK;
// If there is no memory device, there are then also no entries to visit...
if (mMemoryDevice) {
rv = mMemoryDevice->Visit(visitor);
if (NS_FAILED(rv)) return rv;
}
#ifdef NECKO_DISK_CACHE
if (mEnableDiskDevice) {
if (!mDiskDevice) {
rv = CreateDiskDevice();
if (NS_FAILED(rv)) return rv;
}
rv = mDiskDevice->Visit(visitor);
if (NS_FAILED(rv)) return rv;
}
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
if (mEnableOfflineDevice) {
if (!mOfflineDevice) {
rv = CreateOfflineDevice();
if (NS_FAILED(rv)) return rv;
}
rv = mOfflineDevice->Visit(visitor);
if (NS_FAILED(rv)) return rv;
}
#endif // !NECKO_OFFLINE_CACHE
// XXX notify any shutdown process that visitation is complete for THIS visitor.
// XXX keep queue of visitors
return NS_OK;
}
NS_IMETHODIMP nsCacheService::EvictEntries(nsCacheStoragePolicy storagePolicy)
{
return EvictEntriesForClient(nsnull, storagePolicy);
}
/**
* Internal Methods
*/
nsresult
nsCacheService::CreateDiskDevice()
{
#ifdef NECKO_DISK_CACHE
if (!mInitialized) return NS_ERROR_NOT_AVAILABLE;
if (!mEnableDiskDevice) return NS_ERROR_NOT_AVAILABLE;
if (mDiskDevice) return NS_OK;
mDiskDevice = new nsDiskCacheDevice;
if (!mDiskDevice) return NS_ERROR_OUT_OF_MEMORY;
// set the preferences
mDiskDevice->SetCacheParentDirectory(mObserver->DiskCacheParentDirectory());
mDiskDevice->SetCapacity(mObserver->DiskCacheCapacity());
nsresult rv = mDiskDevice->Init();
if (NS_FAILED(rv)) {
#if DEBUG
printf("###\n");
printf("### mDiskDevice->Init() failed (0x%.8x)\n", rv);
printf("### - disabling disk cache for this session.\n");
printf("###\n");
#endif
mEnableDiskDevice = PR_FALSE;
delete mDiskDevice;
mDiskDevice = nsnull;
}
return rv;
#else // !NECKO_DISK_CACHE
NS_NOTREACHED("nsCacheService::CreateDiskDevice");
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
nsresult
nsCacheService::CreateOfflineDevice()
{
#ifdef NECKO_OFFLINE_CACHE
CACHE_LOG_ALWAYS(("Creating offline device"));
if (!mInitialized) return NS_ERROR_NOT_AVAILABLE;
if (!mEnableOfflineDevice) return NS_ERROR_NOT_AVAILABLE;
if (mOfflineDevice) return NS_OK;
mOfflineDevice = new nsOfflineCacheDevice;
if (!mOfflineDevice) return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(mOfflineDevice);
// set the preferences
mOfflineDevice->SetCacheParentDirectory(
mObserver->OfflineCacheParentDirectory());
mOfflineDevice->SetCapacity(mObserver->OfflineCacheCapacity());
nsresult rv = mOfflineDevice->Init();
if (NS_FAILED(rv)) {
CACHE_LOG_DEBUG(("mOfflineDevice->Init() failed (0x%.8x)\n", rv));
CACHE_LOG_DEBUG((" - disabling offline cache for this session.\n"));
mEnableOfflineDevice = PR_FALSE;
NS_RELEASE(mOfflineDevice);
}
return rv;
#else // !NECKO_DISK_CACHE
NS_NOTREACHED("nsCacheService::CreateOfflineDevice");
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
nsresult
nsCacheService::CreateMemoryDevice()
{
if (!mInitialized) return NS_ERROR_NOT_AVAILABLE;
if (!mEnableMemoryDevice) return NS_ERROR_NOT_AVAILABLE;
if (mMemoryDevice) return NS_OK;
mMemoryDevice = new nsMemoryCacheDevice;
if (!mMemoryDevice) return NS_ERROR_OUT_OF_MEMORY;
// set preference
PRInt32 capacity = mObserver->MemoryCacheCapacity();
CACHE_LOG_DEBUG(("Creating memory device with capacity %d\n", capacity));
mMemoryDevice->SetCapacity(capacity);
nsresult rv = mMemoryDevice->Init();
if (NS_FAILED(rv)) {
NS_WARNING("Initialization of Memory Cache failed.");
delete mMemoryDevice;
mMemoryDevice = nsnull;
}
return rv;
}
nsresult
nsCacheService::CreateRequest(nsCacheSession * session,
const nsACString & clientKey,
nsCacheAccessMode accessRequested,
PRBool blockingMode,
nsICacheListener * listener,
nsCacheRequest ** request)
{
NS_ASSERTION(request, "CreateRequest: request is null");
nsCString * key = new nsCString(*session->ClientID());
if (!key)
return NS_ERROR_OUT_OF_MEMORY;
key->Append(':');
key->Append(clientKey);
if (mMaxKeyLength < key->Length()) mMaxKeyLength = key->Length();
// create request
*request = new nsCacheRequest(key, listener, accessRequested, blockingMode, session);
if (!*request) {
delete key;
return NS_ERROR_OUT_OF_MEMORY;
}
if (!listener) return NS_OK; // we're sync, we're done.
// get the request's thread
(*request)->mThread = do_GetCurrentThread();
return NS_OK;
}
class nsCacheListenerEvent : public nsRunnable
{
public:
nsCacheListenerEvent(nsICacheListener *listener,
nsICacheEntryDescriptor *descriptor,
nsCacheAccessMode accessGranted,
nsresult status)
: mListener(listener) // transfers reference
, mDescriptor(descriptor) // transfers reference (may be null)
, mAccessGranted(accessGranted)
, mStatus(status)
{}
NS_IMETHOD Run()
{
mListener->OnCacheEntryAvailable(mDescriptor, mAccessGranted, mStatus);
NS_RELEASE(mListener);
NS_IF_RELEASE(mDescriptor);
return NS_OK;
}
private:
// We explicitly leak mListener or mDescriptor if Run is not called
// because otherwise we cannot guarantee that they are destroyed on
// the right thread.
nsICacheListener *mListener;
nsICacheEntryDescriptor *mDescriptor;
nsCacheAccessMode mAccessGranted;
nsresult mStatus;
};
nsresult
nsCacheService::NotifyListener(nsCacheRequest * request,
nsICacheEntryDescriptor * descriptor,
nsCacheAccessMode accessGranted,
nsresult status)
{
NS_ASSERTION(request->mThread, "no thread set in async request!");
// Swap ownership, and release listener on target thread...
nsICacheListener *listener = request->mListener;
request->mListener = nsnull;
nsCOMPtr<nsIRunnable> ev =
new nsCacheListenerEvent(listener, descriptor,
accessGranted, status);
if (!ev) {
// Better to leak listener and descriptor if we fail because we don't
// want to destroy them inside the cache service lock or on potentially
// the wrong thread.
return NS_ERROR_OUT_OF_MEMORY;
}
return request->mThread->Dispatch(ev, NS_DISPATCH_NORMAL);
}
nsresult
nsCacheService::ProcessRequest(nsCacheRequest * request,
PRBool calledFromOpenCacheEntry,
nsICacheEntryDescriptor ** result)
{
// !!! must be called with mLock held !!!
nsresult rv;
nsCacheEntry * entry = nsnull;
nsCacheAccessMode accessGranted = nsICache::ACCESS_NONE;
if (result) *result = nsnull;
while(1) { // Activate entry loop
rv = ActivateEntry(request, &entry); // get the entry for this request
if (NS_FAILED(rv)) break;
while(1) { // Request Access loop
NS_ASSERTION(entry, "no entry in Request Access loop!");
// entry->RequestAccess queues request on entry
rv = entry->RequestAccess(request, &accessGranted);
if (rv != NS_ERROR_CACHE_WAIT_FOR_VALIDATION) break;
if (request->mListener) // async exits - validate, doom, or close will resume
return rv;
if (request->IsBlocking()) {
// XXX this is probably wrong...
Unlock();
rv = request->WaitForValidation();
Lock();
}
PR_REMOVE_AND_INIT_LINK(request);
if (NS_FAILED(rv)) break; // non-blocking mode returns WAIT_FOR_VALIDATION error
// okay, we're ready to process this request, request access again
}
if (rv != NS_ERROR_CACHE_ENTRY_DOOMED) break;
if (entry->IsNotInUse()) {
// this request was the last one keeping it around, so get rid of it
DeactivateEntry(entry);
}
// loop back around to look for another entry
}
nsICacheEntryDescriptor *descriptor = nsnull;
if (NS_SUCCEEDED(rv))
rv = entry->CreateDescriptor(request, accessGranted, &descriptor);
if (request->mListener) { // Asynchronous
if (NS_FAILED(rv) && calledFromOpenCacheEntry)
return rv; // skip notifying listener, just return rv to caller
// call listener to report error or descriptor
nsresult rv2 = NotifyListener(request, descriptor, accessGranted, rv);
if (NS_FAILED(rv2) && NS_SUCCEEDED(rv)) {
rv = rv2; // trigger delete request
}
} else { // Synchronous
*result = descriptor;
}
return rv;
}
nsresult
nsCacheService::OpenCacheEntry(nsCacheSession * session,
const nsACString & key,
nsCacheAccessMode accessRequested,
PRBool blockingMode,
nsICacheListener * listener,
nsICacheEntryDescriptor ** result)
{
CACHE_LOG_DEBUG(("Opening entry for session %p, key %s, mode %d, blocking %d\n",
session, PromiseFlatCString(key).get(), accessRequested,
blockingMode));
NS_ASSERTION(gService, "nsCacheService::gService is null.");
if (result)
*result = nsnull;
if (!gService->mInitialized)
return NS_ERROR_NOT_INITIALIZED;
nsCacheRequest * request = nsnull;
nsCacheServiceAutoLock lock;
nsresult rv = gService->CreateRequest(session,
key,
accessRequested,
blockingMode,
listener,
&request);
if (NS_FAILED(rv)) return rv;
CACHE_LOG_DEBUG(("Created request %p\n", request));
rv = gService->ProcessRequest(request, PR_TRUE, result);
// delete requests that have completed
if (!(listener && (rv == NS_ERROR_CACHE_WAIT_FOR_VALIDATION)))
delete request;
return rv;
}
nsresult
nsCacheService::ActivateEntry(nsCacheRequest * request,
nsCacheEntry ** result)
{
CACHE_LOG_DEBUG(("Activate entry for request %p\n", request));
nsresult rv = NS_OK;
NS_ASSERTION(request != nsnull, "ActivateEntry called with no request");
if (result) *result = nsnull;
if ((!request) || (!result)) return NS_ERROR_NULL_POINTER;
// check if the request can be satisfied
if (!mEnableMemoryDevice && !request->IsStreamBased())
return NS_ERROR_FAILURE;
if (!IsStorageEnabledForPolicy_Locked(request->StoragePolicy()))
return NS_ERROR_FAILURE;
// search active entries (including those not bound to device)
nsCacheEntry *entry = mActiveEntries.GetEntry(request->mKey);
CACHE_LOG_DEBUG(("Active entry for request %p is %p\n", request, entry));
if (!entry) {
// search cache devices for entry
PRBool collision = PR_FALSE;
entry = SearchCacheDevices(request->mKey, request->StoragePolicy(), &collision);
CACHE_LOG_DEBUG(("Device search for request %p returned %p\n",
request, entry));
// When there is a hashkey collision just refuse to cache it...
if (collision) return NS_ERROR_CACHE_IN_USE;
if (entry) entry->MarkInitialized();
}
if (entry) {
++mCacheHits;
entry->Fetched();
} else {
++mCacheMisses;
}
if (entry &&
((request->AccessRequested() == nsICache::ACCESS_WRITE) ||
((request->StoragePolicy() != nsICache::STORE_OFFLINE) &&
(entry->mExpirationTime <= SecondsFromPRTime(PR_Now()) &&
request->WillDoomEntriesIfExpired()))))
{
// this is FORCE-WRITE request or the entry has expired
rv = DoomEntry_Internal(entry);
if (NS_FAILED(rv)) {
// XXX what to do? Increment FailedDooms counter?
}
entry = nsnull;
}
if (!entry) {
if (! (request->AccessRequested() & nsICache::ACCESS_WRITE)) {
// this is a READ-ONLY request
rv = NS_ERROR_CACHE_KEY_NOT_FOUND;
goto error;
}
entry = new nsCacheEntry(request->mKey,
request->IsStreamBased(),
request->StoragePolicy());
if (!entry)
return NS_ERROR_OUT_OF_MEMORY;
entry->Fetched();
++mTotalEntries;
// XXX we could perform an early bind in some cases based on storage policy
}
if (!entry->IsActive()) {
rv = mActiveEntries.AddEntry(entry);
if (NS_FAILED(rv)) goto error;
CACHE_LOG_DEBUG(("Added entry %p to mActiveEntries\n", entry));
entry->MarkActive(); // mark entry active, because it's now in mActiveEntries
}
*result = entry;
return NS_OK;
error:
*result = nsnull;
if (entry) {
delete entry;
}
return rv;
}
nsCacheEntry *
nsCacheService::SearchCacheDevices(nsCString * key, nsCacheStoragePolicy policy, PRBool *collision)
{
nsCacheEntry * entry = nsnull;
CACHE_LOG_DEBUG(("mMemoryDevice: 0x%p\n", mMemoryDevice));
*collision = PR_FALSE;
if ((policy == nsICache::STORE_ANYWHERE) || (policy == nsICache::STORE_IN_MEMORY)) {
// If there is no memory device, then there is nothing to search...
if (mMemoryDevice) {
entry = mMemoryDevice->FindEntry(key, collision);
CACHE_LOG_DEBUG(("Searching mMemoryDevice for key %s found: 0x%p, "
"collision: %d\n", key->get(), entry, collision));
}
}
if (!entry &&
((policy == nsICache::STORE_ANYWHERE) || (policy == nsICache::STORE_ON_DISK))) {
#ifdef NECKO_DISK_CACHE
if (mEnableDiskDevice) {
if (!mDiskDevice) {
nsresult rv = CreateDiskDevice();
if (NS_FAILED(rv))
return nsnull;
}
entry = mDiskDevice->FindEntry(key, collision);
}
#endif // !NECKO_DISK_CACHE
}
if (!entry && (policy == nsICache::STORE_OFFLINE ||
(policy == nsICache::STORE_ANYWHERE &&
gIOService->IsOffline()))) {
#ifdef NECKO_OFFLINE_CACHE
if (mEnableOfflineDevice) {
if (!mOfflineDevice) {
nsresult rv = CreateOfflineDevice();
if (NS_FAILED(rv))
return nsnull;
}
entry = mOfflineDevice->FindEntry(key, collision);
}
#endif // !NECKO_OFFLINE_CACHE
}
return entry;
}
nsCacheDevice *
nsCacheService::EnsureEntryHasDevice(nsCacheEntry * entry)
{
nsCacheDevice * device = entry->CacheDevice();
if (device) return device;
#ifdef NECKO_DISK_CACHE
if (entry->IsStreamData() && entry->IsAllowedOnDisk() && mEnableDiskDevice) {
// this is the default
if (!mDiskDevice) {
(void)CreateDiskDevice(); // ignore the error (check for mDiskDevice instead)
}
if (mDiskDevice) {
entry->MarkBinding(); // enter state of binding
nsresult rv = mDiskDevice->BindEntry(entry);
entry->ClearBinding(); // exit state of binding
if (NS_SUCCEEDED(rv))
device = mDiskDevice;
}
}
#endif // !NECKO_DISK_CACHE
// if we can't use mDiskDevice, try mMemoryDevice
if (!device && mEnableMemoryDevice && entry->IsAllowedInMemory()) {
if (!mMemoryDevice) {
(void)CreateMemoryDevice(); // ignore the error (check for mMemoryDevice instead)
}
if (mMemoryDevice) {
entry->MarkBinding(); // enter state of binding
nsresult rv = mMemoryDevice->BindEntry(entry);
entry->ClearBinding(); // exit state of binding
if (NS_SUCCEEDED(rv))
device = mMemoryDevice;
}
}
#ifdef NECKO_OFFLINE_CACHE
if (!device && entry->IsStreamData() &&
entry->IsAllowedOffline() && mEnableOfflineDevice) {
if (!mOfflineDevice) {
(void)CreateOfflineDevice(); // ignore the error (check for mOfflineDevice instead)
}
if (mOfflineDevice) {
entry->MarkBinding();
nsresult rv = mOfflineDevice->BindEntry(entry);
entry->ClearBinding();
if (NS_SUCCEEDED(rv))
device = mOfflineDevice;
}
}
#endif // ! NECKO_OFFLINE_CACHE
if (device)
entry->SetCacheDevice(device);
return device;
}
nsresult
nsCacheService::DoomEntry(nsCacheEntry * entry)
{
return gService->DoomEntry_Internal(entry);
}
nsresult
nsCacheService::DoomEntry_Internal(nsCacheEntry * entry)
{
if (entry->IsDoomed()) return NS_OK;
CACHE_LOG_DEBUG(("Dooming entry %p\n", entry));
nsresult rv = NS_OK;
entry->MarkDoomed();
NS_ASSERTION(!entry->IsBinding(), "Dooming entry while binding device.");
nsCacheDevice * device = entry->CacheDevice();
if (device) device->DoomEntry(entry);
if (entry->IsActive()) {
// remove from active entries
mActiveEntries.RemoveEntry(entry);
CACHE_LOG_DEBUG(("Removed entry %p from mActiveEntries\n", entry));
entry->MarkInactive();
}
// put on doom list to wait for descriptors to close
NS_ASSERTION(PR_CLIST_IS_EMPTY(entry), "doomed entry still on device list");
PR_APPEND_LINK(entry, &mDoomedEntries);
// tell pending requests to get on with their lives...
rv = ProcessPendingRequests(entry);
// All requests have been removed, but there may still be open descriptors
if (entry->IsNotInUse()) {
DeactivateEntry(entry); // tell device to get rid of it
}
return rv;
}
void
nsCacheService::OnProfileShutdown(PRBool cleanse)
{
if (!gService) return;
if (!gService->mInitialized) {
// The cache service has been shut down, but someone is still holding
// a reference to it. Ignore this call.
return;
}
nsCacheServiceAutoLock lock;
gService->DoomActiveEntries();
gService->ClearDoomList();
#ifdef NECKO_DISK_CACHE
if (gService->mDiskDevice && gService->mEnableDiskDevice) {
if (cleanse)
gService->mDiskDevice->EvictEntries(nsnull);
gService->mDiskDevice->Shutdown();
}
gService->mEnableDiskDevice = PR_FALSE;
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
if (gService->mOfflineDevice && gService->mEnableOfflineDevice) {
if (cleanse)
gService->mOfflineDevice->EvictEntries(nsnull);
gService->mOfflineDevice->Shutdown();
}
gService->mEnableOfflineDevice = PR_FALSE;
#endif // !NECKO_OFFLINE_CACHE
if (gService->mMemoryDevice) {
// clear memory cache
gService->mMemoryDevice->EvictEntries(nsnull);
}
}
void
nsCacheService::OnProfileChanged()
{
if (!gService) return;
CACHE_LOG_DEBUG(("nsCacheService::OnProfileChanged"));
nsCacheServiceAutoLock lock;
gService->mEnableDiskDevice = gService->mObserver->DiskCacheEnabled();
gService->mEnableOfflineDevice = gService->mObserver->OfflineCacheEnabled();
gService->mEnableMemoryDevice = gService->mObserver->MemoryCacheEnabled();
#ifdef NECKO_DISK_CACHE
if (gService->mDiskDevice) {
gService->mDiskDevice->SetCacheParentDirectory(gService->mObserver->DiskCacheParentDirectory());
gService->mDiskDevice->SetCapacity(gService->mObserver->DiskCacheCapacity());
// XXX initialization of mDiskDevice could be made lazily, if mEnableDiskDevice is false
nsresult rv = gService->mDiskDevice->Init();
if (NS_FAILED(rv)) {
NS_ERROR("nsCacheService::OnProfileChanged: Re-initializing disk device failed");
gService->mEnableDiskDevice = PR_FALSE;
// XXX delete mDiskDevice?
}
}
#endif // !NECKO_DISK_CACHE
#ifdef NECKO_OFFLINE_CACHE
if (gService->mOfflineDevice) {
gService->mOfflineDevice->SetCacheParentDirectory(gService->mObserver->OfflineCacheParentDirectory());
gService->mOfflineDevice->SetCapacity(gService->mObserver->OfflineCacheCapacity());
// XXX initialization of mOfflineDevice could be made lazily, if mEnableOfflineDevice is false
nsresult rv = gService->mOfflineDevice->Init();
if (NS_FAILED(rv)) {
NS_ERROR("nsCacheService::OnProfileChanged: Re-initializing offline device failed");
gService->mEnableOfflineDevice = PR_FALSE;
// XXX delete mOfflineDevice?
}
}
#endif // !NECKO_OFFLINE_CACHE
// If memoryDevice exists, reset its size to the new profile
if (gService->mMemoryDevice) {
if (gService->mEnableMemoryDevice) {
// make sure that capacity is reset to the right value
PRInt32 capacity = gService->mObserver->MemoryCacheCapacity();
CACHE_LOG_DEBUG(("Resetting memory device capacity to %d\n",
capacity));
gService->mMemoryDevice->SetCapacity(capacity);
} else {
// tell memory device to evict everything
CACHE_LOG_DEBUG(("memory device disabled\n"));
gService->mMemoryDevice->SetCapacity(0);
// Don't delete memory device, because some entries may be active still...
}
}
}
void
nsCacheService::SetDiskCacheEnabled(PRBool enabled)
{
if (!gService) return;
nsCacheServiceAutoLock lock;
gService->mEnableDiskDevice = enabled;
}
void
nsCacheService::SetDiskCacheCapacity(PRInt32 capacity)
{
if (!gService) return;
nsCacheServiceAutoLock lock;
#ifdef NECKO_DISK_CACHE
if (gService->mDiskDevice) {
gService->mDiskDevice->SetCapacity(capacity);
}
#endif // !NECKO_DISK_CACHE
gService->mEnableDiskDevice = gService->mObserver->DiskCacheEnabled();
}
void
nsCacheService::SetOfflineCacheEnabled(PRBool enabled)
{
if (!gService) return;
nsCacheServiceAutoLock lock;
gService->mEnableOfflineDevice = enabled;
}
void
nsCacheService::SetOfflineCacheCapacity(PRInt32 capacity)
{
if (!gService) return;
nsCacheServiceAutoLock lock;
#ifdef NECKO_OFFLINE_CACHE
if (gService->mOfflineDevice) {
gService->mOfflineDevice->SetCapacity(capacity);
}
#endif // !NECKO_OFFLINE_CACHE
gService->mEnableOfflineDevice = gService->mObserver->OfflineCacheEnabled();
}
void
nsCacheService::SetMemoryCache()
{
if (!gService) return;
CACHE_LOG_DEBUG(("nsCacheService::SetMemoryCache"));
nsCacheServiceAutoLock lock;
gService->mEnableMemoryDevice = gService->mObserver->MemoryCacheEnabled();
if (gService->mEnableMemoryDevice) {
if (gService->mMemoryDevice) {
PRInt32 capacity = gService->mObserver->MemoryCacheCapacity();
// make sure that capacity is reset to the right value
CACHE_LOG_DEBUG(("Resetting memory device capacity to %d\n",
capacity));
gService->mMemoryDevice->SetCapacity(capacity);
}
} else {
if (gService->mMemoryDevice) {
// tell memory device to evict everything
CACHE_LOG_DEBUG(("memory device disabled\n"));
gService->mMemoryDevice->SetCapacity(0);
// Don't delete memory device, because some entries may be active still...
}
}
}
/******************************************************************************
* static methods for nsCacheEntryDescriptor
*****************************************************************************/
#ifdef XP_MAC
#pragma mark -
#endif
void
nsCacheService::CloseDescriptor(nsCacheEntryDescriptor * descriptor)
{
// ask entry to remove descriptor
nsCacheEntry * entry = descriptor->CacheEntry();
PRBool stillActive = entry->RemoveDescriptor(descriptor);
nsresult rv = NS_OK;
if (!entry->IsValid()) {
rv = gService->ProcessPendingRequests(entry);
}
if (!stillActive) {
gService->DeactivateEntry(entry);
}
}
nsresult
nsCacheService::GetFileForEntry(nsCacheEntry * entry,
nsIFile ** result)
{
nsCacheDevice * device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->GetFileForEntry(entry, result);
}
nsresult
nsCacheService::OpenInputStreamForEntry(nsCacheEntry * entry,
nsCacheAccessMode mode,
PRUint32 offset,
nsIInputStream ** result)
{
nsCacheDevice * device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->OpenInputStreamForEntry(entry, mode, offset, result);
}
nsresult
nsCacheService::OpenOutputStreamForEntry(nsCacheEntry * entry,
nsCacheAccessMode mode,
PRUint32 offset,
nsIOutputStream ** result)
{
nsCacheDevice * device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->OpenOutputStreamForEntry(entry, mode, offset, result);
}
nsresult
nsCacheService::OnDataSizeChange(nsCacheEntry * entry, PRInt32 deltaSize)
{
nsCacheDevice * device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
return device->OnDataSizeChange(entry, deltaSize);
}
void
nsCacheService::Lock()
{
PR_Lock(gService->mLock);
#if defined(DEBUG)
gService->mLockedThread = PR_GetCurrentThread();
#endif
}
void
nsCacheService::Unlock()
{
NS_ASSERTION(gService->mLockedThread == PR_GetCurrentThread(), "oops");
nsTArray<nsISupports*> doomed;
doomed.SwapElements(gService->mDoomedObjects);
#if defined(DEBUG)
gService->mLockedThread = nsnull;
#endif
PR_Unlock(gService->mLock);
for (PRUint32 i = 0; i < doomed.Length(); ++i)
doomed[i]->Release();
}
void
nsCacheService::ReleaseObject_Locked(nsISupports * obj,
nsIEventTarget * target)
{
NS_ASSERTION(gService->mLockedThread == PR_GetCurrentThread(), "oops");
PRBool isCur;
if (!target || NS_SUCCEEDED(target->IsOnCurrentThread(&isCur)) && isCur) {
gService->mDoomedObjects.AppendElement(obj);
} else {
NS_ProxyRelease(target, obj);
}
}
nsresult
nsCacheService::SetCacheElement(nsCacheEntry * entry, nsISupports * element)
{
entry->SetData(element);
entry->TouchData();
return NS_OK;
}
nsresult
nsCacheService::ValidateEntry(nsCacheEntry * entry)
{
nsCacheDevice * device = gService->EnsureEntryHasDevice(entry);
if (!device) return NS_ERROR_UNEXPECTED;
entry->MarkValid();
nsresult rv = gService->ProcessPendingRequests(entry);
NS_ASSERTION(rv == NS_OK, "ProcessPendingRequests failed.");
// XXX what else should be done?
return rv;
}
#ifdef XP_MAC
#pragma mark -
#endif
void
nsCacheService::DeactivateEntry(nsCacheEntry * entry)
{
CACHE_LOG_DEBUG(("Deactivating entry %p\n", entry));
nsresult rv = NS_OK;
NS_ASSERTION(entry->IsNotInUse(), "### deactivating an entry while in use!");
nsCacheDevice * device = nsnull;
if (mMaxDataSize < entry->DataSize() ) mMaxDataSize = entry->DataSize();
if (mMaxMetaSize < entry->MetaDataSize() ) mMaxMetaSize = entry->MetaDataSize();
if (entry->IsDoomed()) {
// remove from Doomed list
PR_REMOVE_AND_INIT_LINK(entry);
} else if (entry->IsActive()) {
// remove from active entries
mActiveEntries.RemoveEntry(entry);
CACHE_LOG_DEBUG(("Removed deactivated entry %p from mActiveEntries\n",
entry));
entry->MarkInactive();
// bind entry if necessary to store meta-data
device = EnsureEntryHasDevice(entry);
if (!device) {
CACHE_LOG_DEBUG(("DeactivateEntry: unable to bind active "
"entry %p\n",
entry));
NS_WARNING("DeactivateEntry: unable to bind active entry\n");
return;
}
} else {
// if mInitialized == PR_FALSE,
// then we're shutting down and this state is okay.
NS_ASSERTION(!mInitialized, "DeactivateEntry: bad cache entry state.");
}
device = entry->CacheDevice();
if (device) {
rv = device->DeactivateEntry(entry);
if (NS_FAILED(rv)) {
// increment deactivate failure count
++mDeactivateFailures;
}
} else {
// increment deactivating unbound entry statistic
++mDeactivatedUnboundEntries;
delete entry; // because no one else will
}
}
nsresult
nsCacheService::ProcessPendingRequests(nsCacheEntry * entry)
{
nsresult rv = NS_OK;
nsCacheRequest * request = (nsCacheRequest *)PR_LIST_HEAD(&entry->mRequestQ);
nsCacheRequest * nextRequest;
PRBool newWriter = PR_FALSE;
if (request == &entry->mRequestQ) return NS_OK; // no queued requests
if (!entry->IsDoomed() && entry->IsInvalid()) {
// 1st descriptor closed w/o MarkValid()
NS_ASSERTION(PR_CLIST_IS_EMPTY(&entry->mDescriptorQ), "shouldn't be here with open descriptors");
#if DEBUG
// verify no ACCESS_WRITE requests(shouldn't have any of these)
while (request != &entry->mRequestQ) {
NS_ASSERTION(request->AccessRequested() != nsICache::ACCESS_WRITE,
"ACCESS_WRITE request should have been given a new entry");
request = (nsCacheRequest *)PR_NEXT_LINK(request);
}
request = (nsCacheRequest *)PR_LIST_HEAD(&entry->mRequestQ);
#endif
// find first request with ACCESS_READ_WRITE (if any) and promote it to 1st writer
while (request != &entry->mRequestQ) {
if (request->AccessRequested() == nsICache::ACCESS_READ_WRITE) {
newWriter = PR_TRUE;
break;
}
request = (nsCacheRequest *)PR_NEXT_LINK(request);
}
if (request == &entry->mRequestQ) // no requests asked for ACCESS_READ_WRITE, back to top
request = (nsCacheRequest *)PR_LIST_HEAD(&entry->mRequestQ);
// XXX what should we do if there are only READ requests in queue?
// XXX serialize their accesses, give them only read access, but force them to check validate flag?
// XXX or do readers simply presume the entry is valid
}
nsCacheAccessMode accessGranted = nsICache::ACCESS_NONE;
while (request != &entry->mRequestQ) {
nextRequest = (nsCacheRequest *)PR_NEXT_LINK(request);
if (request->mListener) {
// Async request
PR_REMOVE_AND_INIT_LINK(request);
if (entry->IsDoomed()) {
rv = ProcessRequest(request, PR_FALSE, nsnull);
if (rv == NS_ERROR_CACHE_WAIT_FOR_VALIDATION)
rv = NS_OK;
else
delete request;
if (NS_FAILED(rv)) {
// XXX what to do?
}
} else if (entry->IsValid() || newWriter) {
rv = entry->RequestAccess(request, &accessGranted);
NS_ASSERTION(NS_SUCCEEDED(rv),
"if entry is valid, RequestAccess must succeed.");
// XXX if (newWriter) NS_ASSERTION( accessGranted == request->AccessRequested(), "why not?");
// entry->CreateDescriptor dequeues request, and queues descriptor
nsICacheEntryDescriptor *descriptor = nsnull;
rv = entry->CreateDescriptor(request,
accessGranted,
&descriptor);
// post call to listener to report error or descriptor
rv = NotifyListener(request, descriptor, accessGranted, rv);
delete request;
if (NS_FAILED(rv)) {
// XXX what to do?
}
} else {
// XXX bad state
}
} else {
// Synchronous request
request->WakeUp();
}
if (newWriter) break; // process remaining requests after validation
request = nextRequest;
}
return NS_OK;
}
void
nsCacheService::ClearPendingRequests(nsCacheEntry * entry)
{
nsCacheRequest * request = (nsCacheRequest *)PR_LIST_HEAD(&entry->mRequestQ);
while (request != &entry->mRequestQ) {
nsCacheRequest * next = (nsCacheRequest *)PR_NEXT_LINK(request);
// XXX we're just dropping these on the floor for now...definitely wrong.
PR_REMOVE_AND_INIT_LINK(request);
delete request;
request = next;
}
}
void
nsCacheService::ClearDoomList()
{
nsCacheEntry * entry = (nsCacheEntry *)PR_LIST_HEAD(&mDoomedEntries);
while (entry != &mDoomedEntries) {
nsCacheEntry * next = (nsCacheEntry *)PR_NEXT_LINK(entry);
entry->DetachDescriptors();
DeactivateEntry(entry);
entry = next;
}
}
void
nsCacheService::ClearActiveEntries()
{
mActiveEntries.VisitEntries(DeactivateAndClearEntry, nsnull);
mActiveEntries.Shutdown();
}
PLDHashOperator
nsCacheService::DeactivateAndClearEntry(PLDHashTable * table,
PLDHashEntryHdr * hdr,
PRUint32 number,
void * arg)
{
nsCacheEntry * entry = ((nsCacheEntryHashTableEntry *)hdr)->cacheEntry;
NS_ASSERTION(entry, "### active entry = nsnull!");
gService->ClearPendingRequests(entry);
entry->DetachDescriptors();
entry->MarkInactive(); // so we don't call Remove() while we're enumerating
gService->DeactivateEntry(entry);
return PL_DHASH_REMOVE; // and continue enumerating
}
void
nsCacheService::DoomActiveEntries()
{
nsAutoTArray<nsCacheEntry*, 8> array;
mActiveEntries.VisitEntries(RemoveActiveEntry, &array);
PRUint32 count = array.Length();
for (PRUint32 i=0; i < count; ++i)
DoomEntry_Internal(array[i]);
}
PLDHashOperator
nsCacheService::RemoveActiveEntry(PLDHashTable * table,
PLDHashEntryHdr * hdr,
PRUint32 number,
void * arg)
{
nsCacheEntry * entry = ((nsCacheEntryHashTableEntry *)hdr)->cacheEntry;
NS_ASSERTION(entry, "### active entry = nsnull!");
nsTArray<nsCacheEntry*> * array = (nsTArray<nsCacheEntry*> *) arg;
NS_ASSERTION(array, "### array = nsnull!");
array->AppendElement(entry);
// entry is being removed from the active entry list
entry->MarkInactive();
return PL_DHASH_REMOVE; // and continue enumerating
}
#if defined(PR_LOGGING)
void
nsCacheService::LogCacheStatistics()
{
PRUint32 hitPercentage = (PRUint32)((((double)mCacheHits) /
((double)(mCacheHits + mCacheMisses))) * 100);
CACHE_LOG_ALWAYS(("\nCache Service Statistics:\n\n"));
CACHE_LOG_ALWAYS((" TotalEntries = %d\n", mTotalEntries));
CACHE_LOG_ALWAYS((" Cache Hits = %d\n", mCacheHits));
CACHE_LOG_ALWAYS((" Cache Misses = %d\n", mCacheMisses));
CACHE_LOG_ALWAYS((" Cache Hit %% = %d%%\n", hitPercentage));
CACHE_LOG_ALWAYS((" Max Key Length = %d\n", mMaxKeyLength));
CACHE_LOG_ALWAYS((" Max Meta Size = %d\n", mMaxMetaSize));
CACHE_LOG_ALWAYS((" Max Data Size = %d\n", mMaxDataSize));
CACHE_LOG_ALWAYS(("\n"));
CACHE_LOG_ALWAYS((" Deactivate Failures = %d\n",
mDeactivateFailures));
CACHE_LOG_ALWAYS((" Deactivated Unbound Entries = %d\n",
mDeactivatedUnboundEntries));
}
#endif
void
nsCacheService::OnEnterExitPrivateBrowsing()
{
if (!gService) return;
nsCacheServiceAutoLock lock;
gService->DoomActiveEntries();
if (gService->mMemoryDevice) {
// clear memory cache
gService->mMemoryDevice->EvictEntries(nsnull);
}
}
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