gecko-dev/xpcom/io/nsFastLoadService.cpp

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C++

/* -*- 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 Mozilla FastLoad code.
*
* 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):
* Brendan Eich <brendan@mozilla.org> (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 "prtypes.h"
#include "prio.h"
#include "prtime.h"
#include "pldhash.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsAutoLock.h"
#include "nsCOMPtr.h"
#include "nsFastLoadFile.h"
#include "nsFastLoadService.h"
#include "nsString.h"
#include "nsIComponentManager.h"
#include "nsIEnumerator.h"
#include "nsIFastLoadFileControl.h"
#include "nsIFile.h"
#include "nsIObjectInputStream.h"
#include "nsIObjectOutputStream.h"
#include "nsISeekableStream.h"
#include "nsISupports.h"
NS_IMPL_THREADSAFE_ISUPPORTS1(nsFastLoadService, nsIFastLoadService)
nsFastLoadService::nsFastLoadService()
: mLock(nsnull),
mFastLoadPtrMap(nsnull),
mDirection(0)
{
}
nsFastLoadService::~nsFastLoadService()
{
if (mInputStream)
mInputStream->Close();
if (mOutputStream)
mOutputStream->Close();
if (mFastLoadPtrMap)
PL_DHashTableDestroy(mFastLoadPtrMap);
if (mLock)
PR_DestroyLock(mLock);
}
nsresult
nsFastLoadService::Create(nsISupports *aOuter, REFNSIID aIID, void **aResult)
{
*aResult = nsnull;
if (aOuter)
return NS_ERROR_NO_AGGREGATION;
nsFastLoadService* fastLoadService = new nsFastLoadService();
if (!fastLoadService)
return NS_ERROR_OUT_OF_MEMORY;
fastLoadService->mLock = PR_NewLock();
if (!fastLoadService->mLock) {
delete fastLoadService;
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(fastLoadService);
nsresult rv = fastLoadService->QueryInterface(aIID, aResult);
NS_RELEASE(fastLoadService);
return rv;
}
nsresult
nsFastLoadService::NewFastLoadFile(const char* aBaseName, nsIFile* *aResult)
{
nsresult rv;
// Try "ProfDS" first, so that we can get the profile directory
// during startup.
nsCOMPtr<nsIFile> profFile;
rv = NS_GetSpecialDirectory("ProfDS",
getter_AddRefs(profFile));
if (NS_FAILED(rv)) {
// The directory service doesn't know about "ProfDS", so just ask
// for the regular profile directory key. Note, however, that this
// will fail if a profile hasn't yet been selected.
rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
getter_AddRefs(profFile));
if (NS_FAILED(rv)) {
return rv;
}
}
// Try "ProfLDS" first, so that we can get the local profile directory
// during startup.
nsCOMPtr<nsIFile> file;
rv = NS_GetSpecialDirectory("ProfLDS", getter_AddRefs(file));
if (NS_FAILED(rv)) {
// The directory service doesn't know about "ProfLDS", so just ask
// for the regular local profile directory key. Note, however, that
// this will fail if a profile hasn't yet been selected.
rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_LOCAL_50_DIR,
getter_AddRefs(file));
}
if (NS_FAILED(rv))
file = profFile;
PRBool sameDir;
rv = file->Equals(profFile, &sameDir);
if (NS_FAILED(rv))
return rv;
nsCAutoString name(aBaseName);
name += PLATFORM_FASL_SUFFIX;
rv = file->AppendNative(name);
if (NS_FAILED(rv))
return rv;
if (!sameDir) {
// Cleanup any pre-existing fastload files that may live in the profile
// directory from previous versions of the code that didn't store them
// in the profile temp directory.
rv = profFile->AppendNative(name);
if (NS_SUCCEEDED(rv))
profFile->Remove(PR_FALSE); // OK if this fails
}
*aResult = file;
NS_ADDREF(*aResult);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::NewInputStream(nsIFile *aFile, nsIObjectInputStream* *aResult)
{
nsAutoLock lock(mLock);
nsCOMPtr<nsIObjectInputStream> stream;
nsresult rv = NS_NewFastLoadFileReader(getter_AddRefs(stream), aFile);
if (NS_FAILED(rv))
return rv;
mFileIO->DisableTruncate();
*aResult = stream;
NS_ADDREF(*aResult);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::NewOutputStream(nsIOutputStream* aDestStream,
nsIObjectOutputStream* *aResult)
{
nsAutoLock lock(mLock);
return NS_NewFastLoadFileWriter(aResult, aDestStream, mFileIO);
}
NS_IMETHODIMP
nsFastLoadService::GetInputStream(nsIObjectInputStream* *aResult)
{
NS_IF_ADDREF(*aResult = mInputStream);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::SetInputStream(nsIObjectInputStream* aStream)
{
nsAutoLock lock(mLock);
mInputStream = aStream;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::GetOutputStream(nsIObjectOutputStream* *aResult)
{
NS_IF_ADDREF(*aResult = mOutputStream);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::SetOutputStream(nsIObjectOutputStream* aStream)
{
nsAutoLock lock(mLock);
mOutputStream = aStream;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::GetFileIO(nsIFastLoadFileIO* *aResult)
{
NS_IF_ADDREF(*aResult = mFileIO);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::SetFileIO(nsIFastLoadFileIO* aFileIO)
{
nsAutoLock lock(mLock);
mFileIO = aFileIO;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::GetDirection(PRInt32 *aResult)
{
*aResult = mDirection;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::HasMuxedDocument(const char* aURISpec, PRBool *aResult)
{
nsresult rv = NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsIFastLoadFileControl> control;
*aResult = PR_FALSE;
nsAutoLock lock(mLock);
if (mInputStream) {
control = do_QueryInterface(mInputStream);
if (control)
rv = control->HasMuxedDocument(aURISpec, aResult);
}
if (! *aResult && mOutputStream) {
control = do_QueryInterface(mOutputStream);
if (control)
rv = control->HasMuxedDocument(aURISpec, aResult);
}
return rv;
}
NS_IMETHODIMP
nsFastLoadService::StartMuxedDocument(nsISupports* aURI, const char* aURISpec,
PRInt32 aDirectionFlags)
{
nsresult rv = NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsIFastLoadFileControl> control;
nsAutoLock lock(mLock);
// Try for an input stream first, in case aURISpec's data is multiplexed
// in the current FastLoad file.
if ((aDirectionFlags & NS_FASTLOAD_READ) && mInputStream) {
control = do_QueryInterface(mInputStream);
if (control) {
// If aURISpec is not in the multiplex, control->StartMuxedDocument
// will return NS_ERROR_NOT_AVAILABLE.
rv = control->StartMuxedDocument(aURI, aURISpec);
if (NS_SUCCEEDED(rv) || rv != NS_ERROR_NOT_AVAILABLE)
return rv;
// Ok, aURISpec is not in the existing mux. If we have no output
// stream yet, wrap the reader with a FastLoad file updater.
if (!mOutputStream && mFileIO) {
// NB: mInputStream must be an nsFastLoadFileReader!
rv = NS_NewFastLoadFileUpdater(getter_AddRefs(mOutputStream),
mFileIO, mInputStream);
if (NS_FAILED(rv))
return rv;
}
if (aDirectionFlags == NS_FASTLOAD_READ) {
// Tell our caller to re-start multiplexing, rather than attempt
// to select and deserialize now.
return NS_ERROR_NOT_AVAILABLE;
}
}
}
if ((aDirectionFlags & NS_FASTLOAD_WRITE) && mOutputStream) {
control = do_QueryInterface(mOutputStream);
if (control)
rv = control->StartMuxedDocument(aURI, aURISpec);
}
return rv;
}
NS_IMETHODIMP
nsFastLoadService::SelectMuxedDocument(nsISupports* aURI, nsISupports** aResult)
{
nsresult rv = NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsIFastLoadFileControl> control;
nsAutoLock lock(mLock);
// Try to select the reader, if any; then only if the URI was not in the
// file already, select the writer/updater.
if (mInputStream) {
control = do_QueryInterface(mInputStream);
if (control) {
rv = control->SelectMuxedDocument(aURI, aResult);
if (NS_SUCCEEDED(rv))
mDirection = NS_FASTLOAD_READ;
}
}
if (rv == NS_ERROR_NOT_AVAILABLE && mOutputStream) {
control = do_QueryInterface(mOutputStream);
if (control) {
rv = control->SelectMuxedDocument(aURI, aResult);
if (NS_SUCCEEDED(rv))
mDirection = NS_FASTLOAD_WRITE;
}
}
return rv;
}
NS_IMETHODIMP
nsFastLoadService::EndMuxedDocument(nsISupports* aURI)
{
nsresult rv = NS_ERROR_NOT_AVAILABLE;
nsCOMPtr<nsIFastLoadFileControl> control;
nsAutoLock lock(mLock);
// Try to end the document identified by aURI in the reader, if any; then
// only if the URI was not in the file already, end the writer/updater.
if (mInputStream) {
control = do_QueryInterface(mInputStream);
if (control)
rv = control->EndMuxedDocument(aURI);
}
if (rv == NS_ERROR_NOT_AVAILABLE && mOutputStream) {
control = do_QueryInterface(mOutputStream);
if (control)
rv = control->EndMuxedDocument(aURI);
}
mDirection = 0;
return rv;
}
NS_IMETHODIMP
nsFastLoadService::AddDependency(nsIFile* aFile)
{
nsAutoLock lock(mLock);
nsCOMPtr<nsIFastLoadWriteControl> control(do_QueryInterface(mOutputStream));
if (!control)
return NS_ERROR_NOT_AVAILABLE;
return control->AddDependency(aFile);
}
NS_IMETHODIMP
nsFastLoadService::ComputeChecksum(nsIFile* aFile,
nsIFastLoadReadControl* aControl,
PRUint32 *aChecksum)
{
nsCAutoString path;
nsresult rv = aFile->GetNativePath(path);
if (NS_FAILED(rv))
return rv;
nsCStringKey key(path);
PRUint32 checksum = NS_PTR_TO_INT32(mChecksumTable.Get(&key));
if (checksum) {
*aChecksum = checksum;
return NS_OK;
}
rv = aControl->ComputeChecksum(&checksum);
if (NS_FAILED(rv))
return rv;
mChecksumTable.Put(&key, NS_INT32_TO_PTR(checksum));
*aChecksum = checksum;
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::CacheChecksum(nsIFile* aFile, nsIObjectOutputStream *aStream)
{
nsCOMPtr<nsIFastLoadFileControl> control(do_QueryInterface(aStream));
if (!control)
return NS_ERROR_FAILURE;
PRUint32 checksum;
nsresult rv = control->GetChecksum(&checksum);
if (NS_FAILED(rv))
return rv;
nsCAutoString path;
rv = aFile->GetNativePath(path);
if (NS_FAILED(rv))
return rv;
nsCStringKey key(path);
mChecksumTable.Put(&key, NS_INT32_TO_PTR(checksum));
return NS_OK;
}
struct nsFastLoadPtrEntry : public PLDHashEntryHdr {
nsISupports** mPtrAddr; // key, must come first for PL_DHashGetStubOps
PRUint32 mOffset;
};
NS_IMETHODIMP
nsFastLoadService::GetFastLoadReferent(nsISupports* *aPtrAddr)
{
NS_ASSERTION(*aPtrAddr == nsnull,
"aPtrAddr doesn't point to null nsFastLoadPtr<T>::mRawAddr?");
nsAutoLock lock(mLock);
if (!mFastLoadPtrMap || !mInputStream)
return NS_OK;
nsFastLoadPtrEntry* entry =
static_cast<nsFastLoadPtrEntry*>
(PL_DHashTableOperate(mFastLoadPtrMap, aPtrAddr,
PL_DHASH_LOOKUP));
if (PL_DHASH_ENTRY_IS_FREE(entry))
return NS_OK;
nsresult rv;
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(mInputStream));
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, entry->mOffset);
if (NS_FAILED(rv))
return rv;
rv = mInputStream->ReadObject(PR_TRUE, aPtrAddr);
if (NS_FAILED(rv))
return rv;
// Shrink the table if half the entries are removed sentinels.
PRUint32 size = PL_DHASH_TABLE_SIZE(mFastLoadPtrMap);
if (mFastLoadPtrMap->removedCount >= (size >> 2))
PL_DHashTableOperate(mFastLoadPtrMap, entry, PL_DHASH_REMOVE);
else
PL_DHashTableRawRemove(mFastLoadPtrMap, entry);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::ReadFastLoadPtr(nsIObjectInputStream* aInputStream,
nsISupports* *aPtrAddr)
{
// nsFastLoadPtrs self-construct to null, so if we have a non-null value
// in our inout parameter, we must have been read already, alright!
if (*aPtrAddr)
return NS_OK;
nsresult rv;
PRUint32 nextOffset;
nsAutoLock lock(mLock);
rv = aInputStream->Read32(&nextOffset);
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(aInputStream));
if (!seekable)
return NS_ERROR_FAILURE;
PRInt64 thisOffset;
rv = seekable->Tell(&thisOffset);
if (NS_FAILED(rv))
return rv;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, nextOffset);
if (NS_FAILED(rv))
return rv;
if (!mFastLoadPtrMap) {
mFastLoadPtrMap = PL_NewDHashTable(PL_DHashGetStubOps(), this,
sizeof(nsFastLoadPtrEntry),
PL_DHASH_MIN_SIZE);
if (!mFastLoadPtrMap)
return NS_ERROR_OUT_OF_MEMORY;
}
nsFastLoadPtrEntry* entry =
static_cast<nsFastLoadPtrEntry*>
(PL_DHashTableOperate(mFastLoadPtrMap, aPtrAddr,
PL_DHASH_ADD));
NS_ASSERTION(entry->mPtrAddr == nsnull, "duplicate nsFastLoadPtr?!");
entry->mPtrAddr = aPtrAddr;
LL_L2UI(entry->mOffset, thisOffset);
return NS_OK;
}
NS_IMETHODIMP
nsFastLoadService::WriteFastLoadPtr(nsIObjectOutputStream* aOutputStream,
nsISupports* aObject)
{
NS_ASSERTION(aObject != nsnull, "writing an unread nsFastLoadPtr?!");
if (!aObject)
return NS_ERROR_UNEXPECTED;
nsresult rv;
nsAutoLock lock(mLock); // serialize writes to aOutputStream
nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(aOutputStream));
if (!seekable)
return NS_ERROR_FAILURE;
PRInt64 saveOffset;
rv = seekable->Tell(&saveOffset);
if (NS_FAILED(rv))
return rv;
rv = aOutputStream->Write32(0); // nextOffset placeholder
if (NS_FAILED(rv))
return rv;
rv = aOutputStream->WriteObject(aObject, PR_TRUE);
if (NS_FAILED(rv))
return rv;
PRInt64 nextOffset;
rv = seekable->Tell(&nextOffset);
if (NS_FAILED(rv))
return rv;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, saveOffset);
if (NS_FAILED(rv))
return rv;
rv = aOutputStream->Write32(nextOffset);
if (NS_FAILED(rv))
return rv;
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, nextOffset);
if (NS_FAILED(rv))
return rv;
return NS_OK;
}