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Diffstat (limited to 'src/rocksdb/util/log_buffer.h')
-rw-r--r-- | src/rocksdb/util/log_buffer.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/rocksdb/util/log_buffer.h b/src/rocksdb/util/log_buffer.h new file mode 100644 index 00000000..e356b93a --- /dev/null +++ b/src/rocksdb/util/log_buffer.h @@ -0,0 +1,55 @@ +// Copyright (c) 2011-present, Facebook, Inc. All rights reserved. +// This source code is licensed under both the GPLv2 (found in the +// COPYING file in the root directory) and Apache 2.0 License +// (found in the LICENSE.Apache file in the root directory). + +#pragma once + +#include "rocksdb/env.h" +#include "util/arena.h" +#include "util/autovector.h" +#include "port/sys_time.h" +#include <ctime> + +namespace rocksdb { + +class Logger; + +// A class to buffer info log entries and flush them in the end. +class LogBuffer { + public: + // log_level: the log level for all the logs + // info_log: logger to write the logs to + LogBuffer(const InfoLogLevel log_level, Logger* info_log); + + // Add a log entry to the buffer. Use default max_log_size. + // max_log_size indicates maximize log size, including some metadata. + void AddLogToBuffer(size_t max_log_size, const char* format, va_list ap); + + size_t IsEmpty() const { return logs_.empty(); } + + // Flush all buffered log to the info log. + void FlushBufferToLog(); + + private: + // One log entry with its timestamp + struct BufferedLog { + struct timeval now_tv; // Timestamp of the log + char message[1]; // Beginning of log message + }; + + const InfoLogLevel log_level_; + Logger* info_log_; + Arena arena_; + autovector<BufferedLog*> logs_; +}; + +// Add log to the LogBuffer for a delayed info logging. It can be used when +// we want to add some logs inside a mutex. +// max_log_size indicates maximize log size, including some metadata. +extern void LogToBuffer(LogBuffer* log_buffer, size_t max_log_size, + const char* format, ...); +// Same as previous function, but with default max log size. +extern void LogToBuffer(LogBuffer* log_buffer, const char* format, ...); + +} // namespace rocksdb |