зеркало из https://github.com/mozilla/pjs.git
319 строки
8.4 KiB
C++
319 строки
8.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code, released
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* March 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998-1999 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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*/
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/**
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* nsMemCache is the implementation of an in-memory network-data
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* cache, used to cache the responses to network retrieval commands.
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* Each cache entry may contain both content, e.g. GIF image data, and
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* associated metadata, e.g. HTTP headers. Each entry is indexed by
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* two different keys: a record id number and an opaque key, which is
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* created by the cache manager by combining the URI with a "secondary
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* key", e.g. HTTP post data.
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*/
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#include "nsMemCache.h"
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#include "nsMemCacheRecord.h"
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#include "nsIGenericFactory.h"
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#include "nsString.h"
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#include "nsHashtable.h"
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#include "nsHashtableEnumerator.h"
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#include "nsEnumeratorUtils.h"
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PRInt32 nsMemCache::gRecordSerialNumber = 0;
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nsMemCache::nsMemCache()
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: mNumEntries(0), mOccupancy(0), mEnabled(PR_TRUE),
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mHashTable(0)
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{
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NS_INIT_REFCNT();
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}
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nsMemCache::~nsMemCache()
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{
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nsresult rv;
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rv = RemoveAll();
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NS_WARN_IF_FALSE(NS_SUCCEEDED(rv) && (mNumEntries == 0),
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"Failure to shut down memory cache cleanly. "
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"Somewhere, someone is holding references to at least one cache record");
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delete mHashTable;
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}
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nsresult
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nsMemCache::Init()
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{
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mHashTable = new nsHashtable(256);
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if (!mHashTable)
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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NS_IMPL_ISUPPORTS1(nsMemCache, nsINetDataCache)
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NS_IMETHODIMP
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nsMemCache::GetDescription(PRUnichar * *aDescription)
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{
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nsAutoString description;
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description.AssignWithConversion("Memory Cache");
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*aDescription = description.ToNewUnicode();
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if (!*aDescription)
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return NS_ERROR_OUT_OF_MEMORY;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::Contains(const char *aKey, PRUint32 aKeyLength, PRBool *aFound)
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{
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nsOpaqueKey opaqueKey(aKey, aKeyLength);
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*aFound = mHashTable->Exists(&opaqueKey);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::GetCachedNetData(const char *aKey, PRUint32 aKeyLength,
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nsINetDataCacheRecord* *aRecord)
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{
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nsresult rv;
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nsMemCacheRecord* record = 0;
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nsOpaqueKey opaqueKey(aKey, aKeyLength);
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record = (nsMemCacheRecord*)mHashTable->Get(&opaqueKey);
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// No existing cache database entry was found. Create a new one.
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// This requires two mappings in the hash table:
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// Record ID ==> record
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// Opaque key ==> record
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if (!record) {
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record = new nsMemCacheRecord;
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if (!record)
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goto out_of_memory;
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rv = record->Init(aKey, aKeyLength, ++gRecordSerialNumber, this);
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if (NS_FAILED(rv)) goto out_of_memory;
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// Index the record by opaque key
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nsOpaqueKey opaqueKey2(record->mKey, record->mKeyLength);
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mHashTable->Put(&opaqueKey2, record);
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// Index the record by it's record ID
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char *recordIDbytes = NS_REINTERPRET_CAST(char *, &record->mRecordID);
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nsOpaqueKey opaqueKey3(recordIDbytes, sizeof record->mRecordID);
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mHashTable->Put(&opaqueKey3, record);
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// The hash table holds on to the record
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record->AddRef();
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mNumEntries++;
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}
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record->AddRef();
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*aRecord = record;
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return NS_OK;
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out_of_memory:
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delete record;
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return NS_ERROR_OUT_OF_MEMORY;
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}
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NS_IMETHODIMP
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nsMemCache::GetCachedNetDataByID(PRInt32 RecordID,
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nsINetDataCacheRecord* *aRecord)
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{
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nsOpaqueKey opaqueKey(NS_REINTERPRET_CAST(const char *, &RecordID),
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sizeof RecordID);
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*aRecord = (nsINetDataCacheRecord*)mHashTable->Get(&opaqueKey);
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if (*aRecord) {
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NS_ADDREF(*aRecord);
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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NS_METHOD
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nsMemCache::Delete(nsMemCacheRecord* aRecord)
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{
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nsMemCacheRecord *removedRecord;
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char *recordIDbytes = NS_REINTERPRET_CAST(char *, &aRecord->mRecordID);
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nsOpaqueKey opaqueRecordIDKey(recordIDbytes,
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sizeof aRecord->mRecordID);
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removedRecord = (nsMemCacheRecord*)mHashTable->Remove(&opaqueRecordIDKey);
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NS_ASSERTION(removedRecord == aRecord, "memory cache database inconsistent");
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nsOpaqueKey opaqueKey(aRecord->mKey, aRecord->mKeyLength);
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removedRecord = (nsMemCacheRecord*)mHashTable->Remove(&opaqueKey);
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NS_ASSERTION(removedRecord == aRecord, "memory cache database inconsistent");
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PRUint32 bytesUsed = 0;
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aRecord->GetStoredContentLength(&bytesUsed);
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aRecord->Release();
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mOccupancy -= bytesUsed;
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mNumEntries--;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::GetEnabled(PRBool *aEnabled)
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{
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NS_ENSURE_ARG(aEnabled);
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*aEnabled = mEnabled;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::SetEnabled(PRBool aEnabled)
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{
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mEnabled = aEnabled;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::GetFlags(PRUint32 *aFlags)
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{
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NS_ENSURE_ARG(aFlags);
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*aFlags = MEMORY_CACHE;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::GetNumEntries(PRUint32 *aNumEntries)
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{
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NS_ENSURE_ARG(aNumEntries);
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*aNumEntries = mNumEntries;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::GetMaxEntries(PRUint32 *aMaxEntries)
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{
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NS_ENSURE_ARG(aMaxEntries);
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*aMaxEntries = MEM_CACHE_MAX_ENTRIES;
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return NS_OK;
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}
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static NS_METHOD
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HashEntryConverter(nsHashKey *aKey, void *aValue,
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void *unused, nsISupports **retval)
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{
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nsMemCacheRecord *record;
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nsOpaqueKey *opaqueKey;
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record = (nsMemCacheRecord*)aValue;
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opaqueKey = (nsOpaqueKey*)aKey;
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// Hash table keys that index cache entries by their record ID
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// shouldn't be enumerated.
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if ((opaqueKey->GetBufferLength() == sizeof(PRInt32))) {
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#ifdef DEBUG
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PRInt32 recordID;
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record->GetRecordID(&recordID);
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NS_ASSERTION(*((PRInt32*)opaqueKey->GetBuffer()) == recordID,
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"Key has incorrect key length");
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#endif
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return NS_ERROR_FAILURE;
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}
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NS_IF_ADDREF(record);
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*retval = NS_STATIC_CAST(nsISupports*, record);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::NewCacheEntryIterator(nsISimpleEnumerator* *aIterator)
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{
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nsCOMPtr<nsIEnumerator> iterator;
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NS_ENSURE_ARG(aIterator);
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NS_NewHashtableEnumerator(mHashTable, HashEntryConverter,
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mHashTable, getter_AddRefs(iterator));
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return NS_NewAdapterEnumerator(aIterator, iterator);
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}
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NS_IMETHODIMP
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nsMemCache::GetNextCache(nsINetDataCache* *aNextCache)
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{
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NS_ENSURE_ARG(aNextCache);
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*aNextCache = mNextCache;
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NS_IF_ADDREF(*aNextCache);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::SetNextCache(nsINetDataCache* aNextCache)
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{
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mNextCache = aNextCache;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::GetStorageInUse(PRUint32 *aStorageInUse)
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{
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NS_ENSURE_ARG(aStorageInUse);
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// Convert from bytes to KB
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*aStorageInUse = (mOccupancy >> 10);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsMemCache::RemoveAll(void)
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{
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PRBool failed;
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nsCOMPtr<nsISimpleEnumerator> iterator;
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nsCOMPtr<nsISupports> recordSupports;
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nsCOMPtr<nsINetDataCacheRecord> record;
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nsresult rv;
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failed = PR_FALSE;
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rv = NewCacheEntryIterator(getter_AddRefs(iterator));
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if (NS_FAILED(rv))
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return rv;
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PRBool notDone;
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while (1) {
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rv = iterator->HasMoreElements(¬Done);
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if (NS_FAILED(rv)) return rv;
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if (!notDone)
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break;
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iterator->GetNext(getter_AddRefs(recordSupports));
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record = do_QueryInterface(recordSupports);
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recordSupports = 0;
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PRUint32 bytesUsed;
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record->GetStoredContentLength(&bytesUsed);
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rv = record->Delete();
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if (NS_FAILED(rv)) {
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failed = PR_TRUE;
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continue;
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}
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}
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if (failed)
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return NS_ERROR_FAILURE;
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return NS_OK;
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}
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