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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#ifndef QPID_LINEARSTORE_JOURNAL_EMPTYFILEPOOL_H_
#define QPID_LINEARSTORE_JOURNAL_EMPTYFILEPOOL_H_
namespace qpid {
namespace linearstore {
namespace journal {
class EmptyFilePool;
}}}
#include <deque>
#include "qpid/linearstore/journal/EmptyFilePoolTypes.h"
#include "qpid/linearstore/journal/smutex.h"
namespace qpid {
namespace linearstore {
namespace journal {
class EmptyFilePoolPartition;
class jdir;
class JournalFile;
class JournalLog;
class EmptyFilePool
{
protected:
typedef std::deque<std::string> emptyFileList_t;
typedef emptyFileList_t::const_iterator emptyFileListConstItr_t;
static std::string s_inuseFileDirectory_;
static std::string s_returnedFileDirectory_;
const std::string efpDirectory_;
const efpDataSize_kib_t efpDataSize_kib_;
const EmptyFilePoolPartition* partitionPtr_;
const bool overwriteBeforeReturnFlag_;
const bool truncateFlag_;
JournalLog& journalLogRef_;
private:
emptyFileList_t emptyFileList_;
smutex emptyFileListMutex_;
public:
EmptyFilePool(const std::string& efpDirectory,
const EmptyFilePoolPartition* partitionPtr,
const bool overwriteBeforeReturnFlag,
const bool truncateFlag,
JournalLog& journalLogRef);
virtual ~EmptyFilePool();
void initialize();
efpDataSize_kib_t dataSize_kib() const;
efpFileSize_kib_t fileSize_kib() const;
efpDataSize_sblks_t dataSize_sblks() const;
efpFileSize_sblks_t fileSize_sblks() const;
efpFileCount_t numEmptyFiles() const;
efpDataSize_kib_t cumFileSize_kib() const;
efpPartitionNumber_t getPartitionNumber() const;
const EmptyFilePoolPartition* getPartition() const;
const efpIdentity_t getIdentity() const;
std::string takeEmptyFile(const std::string& destDirectory);
void returnEmptyFileSymlink(const std::string& emptyFileSymlink);
static std::string dirNameFromDataSize(const efpDataSize_kib_t efpDataSize_kib);
static efpDataSize_kib_t dataSizeFromDirName_kib(const std::string& dirName,
const efpPartitionNumber_t partitionNumber);
protected:
void checkIosState(std::ofstream& ofs,
const uint32_t jerrno,
const std::string& fqFileName,
const std::string& operation,
const std::string& errorMessage,
const std::string& className,
const std::string& fnName);
std::string createEmptyFile();
std::string getEfpFileName();
void initializeSubDirectory(const std::string& fqDirName);
void overwriteFileContents(const std::string& fqFileName);
std::string popEmptyFile();
void pushEmptyFile(const std::string fqFileName);
void returnEmptyFile(const std::string& emptyFileName);
void resetEmptyFileHeader(const std::string& fqFileName);
bool validateEmptyFile(const std::string& emptyFileName) const;
static int createSymLink(const std::string& fqFileName,
const std::string& fqLinkName);
static std::string deleteSymlink(const std::string& fqLinkName);
static bool isFile(const std::string& fqName);
static bool isSymlink(const std::string& fqName);
static bool moveFile(const std::string& fromFqPath,
const std::string& toFqPath);
};
}}}
#endif /* QPID_LINEARSTORE_JOURNAL_EMPTYFILEPOOL_H_ */
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