imgtools/romtools/rofsbuild/src/cache/cachemanager.cpp
author jjkang
Fri, 25 Jun 2010 18:11:34 +0800
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/*
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* Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description: 
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*
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*/
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#include <stdlib.h>
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#include <string>
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#include <queue>
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#include <new>
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#include "e32image.h"
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#include <filesystem.hpp>
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#include <thread/thread.hpp>
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#include <thread/mutex.hpp>
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#include <thread/condition_variable.hpp>
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#include "cache/cacheexception.hpp"
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#include "cache/cacheentry.hpp"
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#include "cache/cache.hpp"
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#include "cache/cachegenerator.hpp"
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#include "cache/cachevalidator.hpp"
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#include "cache/cacheablelist.hpp"
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#include "cache/cachemanager.hpp"
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using namespace std;
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CacheManager* CacheManager::Only = (CacheManager*)0;
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boost::mutex  CacheManager::creationlock;
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CacheManager* CacheManager::GetInstance(void) throw (CacheException)
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{
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	if(! CacheManager::Only)
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	{
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		boost::mutex::scoped_lock lock(CacheManager::creationlock);
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		if(! CacheManager::Only)
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		{
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			CacheManager::Only = new (nothrow) CacheManager();
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			if(!CacheManager::Only)
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				throw CacheException(CacheException::RESOURCE_ALLOCATION_FAILURE);
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			CacheManager::Only->InitializeCache();
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		}
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	}
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	return CacheManager::Only;
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}
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E32ImageFile* CacheManager::GetE32ImageFile(char* OriginalFilename, int CurrentCompressionID)
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{
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	this->NormalizeFilename(OriginalFilename);
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	CacheEntry* validatedfile =CacheValidator::GetInstance()->Validate(OriginalFilename, CurrentCompressionID);
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	if(! validatedfile)
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		return (E32ImageFile*)0;
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	printf("%s is validated in cache.\r\n", OriginalFilename);
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	E32ImageFile* cachedimagefile = new (nothrow) E32ImageFile();
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	if(! cachedimagefile)
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		return (E32ImageFile*)0;
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	boost::filesystem::path cachedfile(validatedfile->GetCachedFilename());
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	ifstream filecontentreader(cachedfile.file_string().c_str(), ios_base::in | ios_base::binary);
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	if(! filecontentreader.is_open())
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		return (E32ImageFile*)0;
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	filecontentreader.seekg(0, ios_base::end);
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	int contentlength = filecontentreader.tellg();
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	cachedimagefile->iData = (char*)malloc(sizeof(char)*contentlength);
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	filecontentreader.seekg(0, ios_base::beg);
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	filecontentreader.read(cachedimagefile->iData, contentlength);
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	cachedimagefile->iHdr->iUncompressedSize = contentlength - cachedimagefile->iHdr->TotalSize();
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	return cachedimagefile;
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}
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CacheEntry* CacheManager::GetE32ImageFileRepresentation(char* OriginalFilename, int CurrentCompressionID)
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{
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	this->NormalizeFilename(OriginalFilename);
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	return CacheValidator::GetInstance()->Validate(OriginalFilename, CurrentCompressionID);
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}
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void CacheManager::Invalidate(char* Filename, CacheEntry* EntryRef) throw (CacheException)
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{
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	//update cache meta file.
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	this->NormalizeFilename(Filename);
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	Cache::GetInstance()->AddEntry(Filename, EntryRef);
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	//update cache content.
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	CacheableList::GetInstance()->AddCacheable(EntryRef);
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	printf("Caching %s\r\n", Filename);
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	return;
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}
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void CacheManager::CleanCache(void) throw (CacheException)
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{
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	//check if the cache is present in the current system.
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	boost::filesystem::path cacherootdir(this->cacheroot);
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	if(! exists(cacherootdir))
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		throw CacheException(CacheException::CACHE_NOT_FOUND);
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	//remove files iteratively from cache root directory.
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	if(remove_all(cacherootdir) <= 0)
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		throw CacheException(CacheException::CACHE_IS_EMPTY);
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	return;
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}
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const char* CacheManager::GetCacheRoot(void)
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{
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	return this->cacheroot;
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}
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CacheManager::~CacheManager(void)
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{
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	CacheEntry* newentryref = new (nothrow) CacheEntry();
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	CacheableList::GetInstance()->AddCacheable(newentryref);
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	Cache::GetInstance()->CloseCache();
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	CacheGenerator::GetInstance()->join();
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	delete CacheValidator::GetInstance();
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	delete Cache::GetInstance();
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	delete CacheGenerator::GetInstance();
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	delete CacheableList::GetInstance();
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	return;
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}
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void CacheManager::InitializeCache(void) throw (CacheException)
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{
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	//assume the root directory is EPOCROOT/epoc32/build/.cache
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	char* epocroot = getenv("EPOCROOT");
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	if(! epocroot)
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		throw CacheException(CacheException::EPOCROOT_NOT_FOUND);
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	//initialize cacheroot member variable.
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	int cacherootstrlen = sizeof(char)*(strlen(epocroot)+strlen("/epoc32/build/.cache")+1);
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	this->cacheroot = (char*)malloc(cacherootstrlen);
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	if(! this->cacheroot)
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		throw CacheException(CacheException::RESOURCE_ALLOCATION_FAILURE);
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	memset(this->cacheroot, 0, cacherootstrlen);
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	sprintf(this->cacheroot, "%s%s", epocroot, "/epoc32/build/.cache");
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	//normalize cache root path.
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	this->NormalizeFilename(this->cacheroot);
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	//create cache root directory if it is not present.
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	boost::filesystem::path cacherootdir(this->cacheroot);
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	if(! exists(cacherootdir))
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		create_directories(cacherootdir);
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	printf("Using %s as cache root directory.\r\n", cacherootdir.file_string().c_str());
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	//create cache instance.
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	Cache* cacheref = Cache::GetInstance();
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	if(! cacheref)
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		throw CacheException(CacheException::RESOURCE_ALLOCATION_FAILURE);
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	//create cache validator instance.
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	if(! CacheValidator::GetInstance())
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		throw CacheException(CacheException::RESOURCE_ALLOCATION_FAILURE);
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	//create cacheable list instance
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	if(! CacheableList::GetInstance())
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		throw CacheException(CacheException::RESOURCE_ALLOCATION_FAILURE);
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	//initialize cache container.
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	cacheref->Initialize();
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	//start cache generator.
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	CacheGenerator::GetInstance();
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	return;
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}
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void CacheManager::NormalizeFilename(char* Filename)
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{
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	if(!Filename)
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		return;
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	//convert back slashes into forward slashes.
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	char* normalizedfilename = Filename;
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	while(*normalizedfilename)
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	{
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		if(*normalizedfilename == '\\')
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			*normalizedfilename = '/';
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		normalizedfilename++;
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	}
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	//remove redundant slashes.
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	char* redundantfilename = Filename;
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	while(*redundantfilename)
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	{
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		if((*redundantfilename=='/') && (*(redundantfilename+1)=='/'))
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		{
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			redundantfilename++;
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			continue;
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		}
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		*Filename++ = *redundantfilename++;
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	}
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	*Filename = 0;
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	return;
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}
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CacheManager::CacheManager(void)
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{
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	return;
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}