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/* Copyright 2013 10gen Inc.
*
* Licensed 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.
*/
#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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