67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* 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 <vector>
|
|
|
|
#include <folly/logging/AsyncLogWriter.h>
|
|
|
|
namespace folly {
|
|
/**
|
|
* An implementation of `folly::AsyncLogWriter` that writes log messages into a
|
|
* file.
|
|
*
|
|
* See `folly::AsyncLogWriter` for details on asynchronous IO.
|
|
*/
|
|
class AsyncFileWriter : public AsyncLogWriter {
|
|
public:
|
|
/**
|
|
* Construct an AsyncFileWriter that appends to the file at the specified
|
|
* path.
|
|
*/
|
|
explicit AsyncFileWriter(folly::StringPiece path);
|
|
|
|
/**
|
|
* Construct an AsyncFileWriter that writes to the specified File object.
|
|
*/
|
|
explicit AsyncFileWriter(folly::File&& file);
|
|
|
|
~AsyncFileWriter();
|
|
|
|
/**
|
|
* Returns true if the output steam is a tty.
|
|
*/
|
|
bool ttyOutput() const override;
|
|
|
|
/**
|
|
* Get the output file.
|
|
*/
|
|
const folly::File& getFile() const { return file_; }
|
|
|
|
private:
|
|
void writeToFile(
|
|
const std::vector<std::string>& ioQueue, size_t numDiscarded);
|
|
|
|
void performIO(
|
|
const std::vector<std::string>& ioQueue, size_t numDiscarded) override;
|
|
|
|
std::string getNumDiscardedMsg(size_t numDiscarded);
|
|
|
|
folly::File file_;
|
|
};
|
|
} // namespace folly
|