зеркало из https://github.com/mozilla/gecko-dev.git
527 строки
14 KiB
C++
527 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nspr.h"
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#include "nsCacheEntry.h"
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#include "nsCacheEntryDescriptor.h"
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#include "nsCacheMetaData.h"
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#include "nsCacheRequest.h"
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#include "nsThreadUtils.h"
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#include "nsError.h"
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#include "nsICacheService.h"
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#include "nsCache.h"
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#include "nsCacheService.h"
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#include "nsCacheDevice.h"
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#include "nsHashKeys.h"
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using namespace mozilla;
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nsCacheEntry::nsCacheEntry(nsCString * key,
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bool streamBased,
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nsCacheStoragePolicy storagePolicy)
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: mKey(key),
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mFetchCount(0),
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mLastFetched(0),
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mLastModified(0),
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mExpirationTime(nsICache::NO_EXPIRATION_TIME),
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mFlags(0),
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mPredictedDataSize(-1),
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mDataSize(0),
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mCacheDevice(nsnull),
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mCustomDevice(nsnull),
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mData(nsnull)
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{
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MOZ_COUNT_CTOR(nsCacheEntry);
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PR_INIT_CLIST(this);
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PR_INIT_CLIST(&mRequestQ);
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PR_INIT_CLIST(&mDescriptorQ);
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if (streamBased) MarkStreamBased();
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SetStoragePolicy(storagePolicy);
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MarkPublic();
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}
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nsCacheEntry::~nsCacheEntry()
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{
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MOZ_COUNT_DTOR(nsCacheEntry);
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delete mKey;
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if (mData)
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nsCacheService::ReleaseObject_Locked(mData, mThread);
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}
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nsresult
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nsCacheEntry::Create( const char * key,
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bool streamBased,
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nsCacheStoragePolicy storagePolicy,
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nsCacheDevice * device,
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nsCacheEntry ** result)
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{
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nsCString* newKey = new nsCString(key);
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if (!newKey) return NS_ERROR_OUT_OF_MEMORY;
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nsCacheEntry* entry = new nsCacheEntry(newKey, streamBased, storagePolicy);
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if (!entry) { delete newKey; return NS_ERROR_OUT_OF_MEMORY; }
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entry->SetCacheDevice(device);
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*result = entry;
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return NS_OK;
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}
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void
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nsCacheEntry::Fetched()
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{
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mLastFetched = SecondsFromPRTime(PR_Now());
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++mFetchCount;
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MarkEntryDirty();
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}
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const char *
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nsCacheEntry::GetDeviceID()
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{
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if (mCacheDevice) return mCacheDevice->GetDeviceID();
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return nsnull;
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}
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void
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nsCacheEntry::TouchData()
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{
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mLastModified = SecondsFromPRTime(PR_Now());
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MarkDataDirty();
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}
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void
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nsCacheEntry::SetData(nsISupports * data)
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{
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if (mData) {
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nsCacheService::ReleaseObject_Locked(mData, mThread);
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mData = nsnull;
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}
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if (data) {
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NS_ADDREF(mData = data);
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mThread = do_GetCurrentThread();
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}
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}
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void
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nsCacheEntry::TouchMetaData()
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{
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mLastModified = SecondsFromPRTime(PR_Now());
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MarkMetaDataDirty();
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}
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/**
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* cache entry states
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* 0 descriptors (new entry)
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* 0 descriptors (existing, bound entry)
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* n descriptors (existing, bound entry) valid
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* n descriptors (existing, bound entry) not valid (wait until valid or doomed)
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*/
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nsresult
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nsCacheEntry::RequestAccess(nsCacheRequest * request, nsCacheAccessMode *accessGranted)
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{
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nsresult rv = NS_OK;
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if (IsDoomed()) return NS_ERROR_CACHE_ENTRY_DOOMED;
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if (!IsInitialized()) {
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// brand new, unbound entry
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request->mKey = nsnull; // steal ownership of the key string
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if (request->IsStreamBased()) MarkStreamBased();
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MarkInitialized();
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*accessGranted = request->AccessRequested() & nsICache::ACCESS_WRITE;
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NS_ASSERTION(*accessGranted, "new cache entry for READ-ONLY request");
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PR_APPEND_LINK(request, &mRequestQ);
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return rv;
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}
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if (IsStreamData() != request->IsStreamBased()) {
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*accessGranted = nsICache::ACCESS_NONE;
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return request->IsStreamBased() ?
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NS_ERROR_CACHE_DATA_IS_NOT_STREAM : NS_ERROR_CACHE_DATA_IS_STREAM;
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}
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if (PR_CLIST_IS_EMPTY(&mDescriptorQ)) {
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// 1st descriptor for existing bound entry
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*accessGranted = request->AccessRequested();
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if (*accessGranted & nsICache::ACCESS_WRITE) {
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MarkInvalid();
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} else {
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MarkValid();
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}
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} else {
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// nth request for existing, bound entry
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*accessGranted = request->AccessRequested() & ~nsICache::ACCESS_WRITE;
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if (!IsValid())
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rv = NS_ERROR_CACHE_WAIT_FOR_VALIDATION;
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}
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PR_APPEND_LINK(request,&mRequestQ);
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return rv;
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}
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nsresult
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nsCacheEntry::CreateDescriptor(nsCacheRequest * request,
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nsCacheAccessMode accessGranted,
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nsICacheEntryDescriptor ** result)
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{
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NS_ENSURE_ARG_POINTER(request && result);
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nsCacheEntryDescriptor * descriptor =
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new nsCacheEntryDescriptor(this, accessGranted);
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// XXX check request is on q
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PR_REMOVE_AND_INIT_LINK(request); // remove request regardless of success
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if (descriptor == nsnull)
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return NS_ERROR_OUT_OF_MEMORY;
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PR_APPEND_LINK(descriptor, &mDescriptorQ);
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CACHE_LOG_DEBUG((" descriptor %p created for request %p on entry %p\n",
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descriptor, request, this));
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NS_ADDREF(*result = descriptor);
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return NS_OK;
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}
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bool
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nsCacheEntry::RemoveRequest(nsCacheRequest * request)
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{
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// XXX if debug: verify this request belongs to this entry
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PR_REMOVE_AND_INIT_LINK(request);
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// return true if this entry should stay active
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return !((PR_CLIST_IS_EMPTY(&mRequestQ)) &&
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(PR_CLIST_IS_EMPTY(&mDescriptorQ)));
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}
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bool
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nsCacheEntry::RemoveDescriptor(nsCacheEntryDescriptor * descriptor)
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{
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NS_ASSERTION(descriptor->CacheEntry() == this, "### Wrong cache entry!!");
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nsresult rv = descriptor->CloseOutput();
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if (rv == NS_BASE_STREAM_WOULD_BLOCK)
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return true;
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descriptor->ClearCacheEntry();
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PR_REMOVE_AND_INIT_LINK(descriptor);
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// Doom entry if something bad happens while closing. See bug #673543
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if (NS_FAILED(rv))
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nsCacheService::DoomEntry(this);
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if (!PR_CLIST_IS_EMPTY(&mDescriptorQ))
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return true; // stay active if we still have open descriptors
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if (PR_CLIST_IS_EMPTY(&mRequestQ))
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return false; // no descriptors or requests, we can deactivate
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return true; // find next best request to give a descriptor to
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}
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void
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nsCacheEntry::DetachDescriptors(void)
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{
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nsCacheEntryDescriptor * descriptor =
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(nsCacheEntryDescriptor *)PR_LIST_HEAD(&mDescriptorQ);
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while (descriptor != &mDescriptorQ) {
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nsCacheEntryDescriptor * nextDescriptor =
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(nsCacheEntryDescriptor *)PR_NEXT_LINK(descriptor);
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// Doom entry if something bad happens while closing. See bug #673543
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// Errors are handled different from RemoveDescriptor because this
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// method is only called from ClearDoomList (in which case the entry is
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// doomed anyway) and ClearActiveEntries (in which case we are shutting
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// down and really want to get rid of the entry immediately)
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if (NS_FAILED(descriptor->CloseOutput()))
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nsCacheService::DoomEntry(this);
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descriptor->ClearCacheEntry();
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PR_REMOVE_AND_INIT_LINK(descriptor);
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descriptor = nextDescriptor;
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}
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}
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/******************************************************************************
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* nsCacheEntryInfo - for implementing about:cache
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*****************************************************************************/
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NS_IMPL_ISUPPORTS1(nsCacheEntryInfo, nsICacheEntryInfo)
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NS_IMETHODIMP
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nsCacheEntryInfo::GetClientID(char ** clientID)
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{
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NS_ENSURE_ARG_POINTER(clientID);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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return ClientIDFromCacheKey(*mCacheEntry->Key(), clientID);
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::GetDeviceID(char ** deviceID)
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{
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NS_ENSURE_ARG_POINTER(deviceID);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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*deviceID = NS_strdup(mCacheEntry->GetDeviceID());
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return *deviceID ? NS_OK : NS_ERROR_OUT_OF_MEMORY;
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::GetKey(nsACString &key)
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{
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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return ClientKeyFromCacheKey(*mCacheEntry->Key(), key);
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::GetFetchCount(PRInt32 * fetchCount)
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{
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NS_ENSURE_ARG_POINTER(fetchCount);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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*fetchCount = mCacheEntry->FetchCount();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::GetLastFetched(PRUint32 * lastFetched)
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{
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NS_ENSURE_ARG_POINTER(lastFetched);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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*lastFetched = mCacheEntry->LastFetched();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::GetLastModified(PRUint32 * lastModified)
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{
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NS_ENSURE_ARG_POINTER(lastModified);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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*lastModified = mCacheEntry->LastModified();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::GetExpirationTime(PRUint32 * expirationTime)
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{
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NS_ENSURE_ARG_POINTER(expirationTime);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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*expirationTime = mCacheEntry->ExpirationTime();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::GetDataSize(PRUint32 * dataSize)
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{
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NS_ENSURE_ARG_POINTER(dataSize);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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*dataSize = mCacheEntry->DataSize();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsCacheEntryInfo::IsStreamBased(bool * result)
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{
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NS_ENSURE_ARG_POINTER(result);
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if (!mCacheEntry) return NS_ERROR_NOT_AVAILABLE;
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*result = mCacheEntry->IsStreamData();
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return NS_OK;
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}
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/******************************************************************************
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* nsCacheEntryHashTable
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*****************************************************************************/
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PLDHashTableOps
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nsCacheEntryHashTable::ops =
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{
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PL_DHashAllocTable,
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PL_DHashFreeTable,
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HashKey,
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MatchEntry,
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MoveEntry,
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ClearEntry,
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PL_DHashFinalizeStub
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};
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nsCacheEntryHashTable::nsCacheEntryHashTable()
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: initialized(false)
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{
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MOZ_COUNT_CTOR(nsCacheEntryHashTable);
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}
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nsCacheEntryHashTable::~nsCacheEntryHashTable()
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{
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MOZ_COUNT_DTOR(nsCacheEntryHashTable);
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if (initialized)
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Shutdown();
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}
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nsresult
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nsCacheEntryHashTable::Init()
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{
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nsresult rv = NS_OK;
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initialized = PL_DHashTableInit(&table, &ops, nsnull,
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sizeof(nsCacheEntryHashTableEntry), 512);
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if (!initialized) rv = NS_ERROR_OUT_OF_MEMORY;
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return rv;
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}
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void
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nsCacheEntryHashTable::Shutdown()
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{
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if (initialized) {
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PL_DHashTableFinish(&table);
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initialized = false;
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}
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}
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nsCacheEntry *
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nsCacheEntryHashTable::GetEntry( const nsCString * key)
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{
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PLDHashEntryHdr *hashEntry;
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nsCacheEntry *result = nsnull;
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NS_ASSERTION(initialized, "nsCacheEntryHashTable not initialized");
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if (!initialized) return nsnull;
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hashEntry = PL_DHashTableOperate(&table, key, PL_DHASH_LOOKUP);
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if (PL_DHASH_ENTRY_IS_BUSY(hashEntry)) {
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result = ((nsCacheEntryHashTableEntry *)hashEntry)->cacheEntry;
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}
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return result;
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}
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nsresult
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nsCacheEntryHashTable::AddEntry( nsCacheEntry *cacheEntry)
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{
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PLDHashEntryHdr *hashEntry;
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NS_ASSERTION(initialized, "nsCacheEntryHashTable not initialized");
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if (!initialized) return NS_ERROR_NOT_INITIALIZED;
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if (!cacheEntry) return NS_ERROR_NULL_POINTER;
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hashEntry = PL_DHashTableOperate(&table, cacheEntry->mKey, PL_DHASH_ADD);
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#ifndef DEBUG_dougt
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NS_ASSERTION(((nsCacheEntryHashTableEntry *)hashEntry)->cacheEntry == 0,
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"### nsCacheEntryHashTable::AddEntry - entry already used");
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#endif
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((nsCacheEntryHashTableEntry *)hashEntry)->cacheEntry = cacheEntry;
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return NS_OK;
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}
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void
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nsCacheEntryHashTable::RemoveEntry( nsCacheEntry *cacheEntry)
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{
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NS_ASSERTION(initialized, "nsCacheEntryHashTable not initialized");
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NS_ASSERTION(cacheEntry, "### cacheEntry == nsnull");
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if (!initialized) return; // NS_ERROR_NOT_INITIALIZED
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#if DEBUG
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// XXX debug code to make sure we have the entry we're trying to remove
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nsCacheEntry *check = GetEntry(cacheEntry->mKey);
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NS_ASSERTION(check == cacheEntry, "### Attempting to remove unknown cache entry!!!");
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#endif
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(void) PL_DHashTableOperate(&table, cacheEntry->mKey, PL_DHASH_REMOVE);
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}
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void
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nsCacheEntryHashTable::VisitEntries( PLDHashEnumerator etor, void *arg)
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{
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NS_ASSERTION(initialized, "nsCacheEntryHashTable not initialized");
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if (!initialized) return; // NS_ERROR_NOT_INITIALIZED
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PL_DHashTableEnumerate(&table, etor, arg);
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}
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/**
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* hash table operation callback functions
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*/
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PLDHashNumber
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nsCacheEntryHashTable::HashKey( PLDHashTable *table, const void *key)
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{
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return HashString(*static_cast<const nsCString *>(key));
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}
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bool
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nsCacheEntryHashTable::MatchEntry(PLDHashTable * /* table */,
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const PLDHashEntryHdr * hashEntry,
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const void * key)
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{
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NS_ASSERTION(key != nsnull, "### nsCacheEntryHashTable::MatchEntry : null key");
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nsCacheEntry *cacheEntry = ((nsCacheEntryHashTableEntry *)hashEntry)->cacheEntry;
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return cacheEntry->mKey->Equals(*(nsCString *)key);
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}
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void
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nsCacheEntryHashTable::MoveEntry(PLDHashTable * /* table */,
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const PLDHashEntryHdr *from,
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PLDHashEntryHdr *to)
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{
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((nsCacheEntryHashTableEntry *)to)->cacheEntry =
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((nsCacheEntryHashTableEntry *)from)->cacheEntry;
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}
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void
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nsCacheEntryHashTable::ClearEntry(PLDHashTable * /* table */,
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PLDHashEntryHdr * hashEntry)
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{
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((nsCacheEntryHashTableEntry *)hashEntry)->cacheEntry = 0;
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}
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