mirror of https://github.com/facebook/rocksdb.git
58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include <ctime>
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#include "memory/arena.h"
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#include "port/sys_time.h"
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#include "rocksdb/env.h"
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#include "util/autovector.h"
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namespace ROCKSDB_NAMESPACE {
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class Logger;
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// A class to buffer info log entries and flush them in the end.
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class LogBuffer {
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public:
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// log_level: the log level for all the logs
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// info_log: logger to write the logs to
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LogBuffer(const InfoLogLevel log_level, Logger* info_log);
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// Add a log entry to the buffer. Use default max_log_size.
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// max_log_size indicates maximize log size, including some metadata.
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void AddLogToBuffer(size_t max_log_size, const char* format, va_list ap);
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size_t IsEmpty() const { return logs_.empty(); }
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// Flush all buffered log to the info log.
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void FlushBufferToLog();
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static const size_t kDefaultMaxLogSize = 512;
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private:
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// One log entry with its timestamp
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struct BufferedLog {
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port::TimeVal now_tv; // Timestamp of the log
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char message[1]; // Beginning of log message
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};
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const InfoLogLevel log_level_;
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Logger* info_log_;
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Arena arena_;
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autovector<BufferedLog*> logs_;
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};
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// Add log to the LogBuffer for a delayed info logging. It can be used when
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// we want to add some logs inside a mutex.
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// max_log_size indicates maximize log size, including some metadata.
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void LogToBuffer(LogBuffer* log_buffer, size_t max_log_size, const char* format,
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...);
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// Same as previous function, but with default max log size.
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void LogToBuffer(LogBuffer* log_buffer, const char* format, ...);
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} // namespace ROCKSDB_NAMESPACE
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