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/* Copyright 2013 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <string>
#include <utility>
#include <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/base/status_with.h"
#include "mongo/logger/rotatable_file_writer.h"
#include "mongo/platform/unordered_map.h"
namespace mongo {
namespace logger {
typedef StatusWith<RotatableFileWriter*> StatusWithRotatableFileWriter;
/**
* Utility object that owns and manages rotation for RotatableFileWriters.
*
* Unlike RotatableFileWriter, this type leaves synchronization to its consumers.
*/
class RotatableFileManager {
MONGO_DISALLOW_COPYING(RotatableFileManager);
public:
typedef std::pair<std::string, Status> FileNameStatusPair;
typedef std::vector<FileNameStatusPair> FileNameStatusPairVector;
RotatableFileManager();
~RotatableFileManager();
/**
* Opens "name" in mode "append" and returns a new RotatableFileWriter set to
* operate on the file.
*
* If the manager already has opened "name", returns ErrorCodes::FileAlreadyOpen.
* May also return failure codes issued by RotatableFileWriter::Use::setFileName().
*/
StatusWithRotatableFileWriter openFile(const std::string& name, bool append);
/**
* Gets a RotatableFileWriter for writing to "name", if the manager owns one, or NULL if
* not.
*/
RotatableFileWriter* getFile(const std::string& name);
/**
* Rotates all managed files, renaming each file by appending "renameTargetSuffix".
*
* Returns a vector of <filename, Status> pairs for filenames with non-OK rotate status.
* An empty vector indicates that all files were rotated successfully.
*/
FileNameStatusPairVector rotateAll(const std::string& renameTargetSuffix);
private:
typedef unordered_map<std::string, RotatableFileWriter*> WriterByNameMap;
WriterByNameMap _writers;
};
} // namespace logger
} // namespace mongo
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