47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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#pragma once
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#include "rocksdb/env.h"
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#include "util/arena.h"
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#include "util/autovector.h"
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namespace rocksdb {
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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.
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void AddLogToBuffer(const char* format, va_list ap);
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// Flush all buffered log to the info log.
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void FlushBufferToLog();
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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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struct 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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extern void LogToBuffer(LogBuffer* log_buffer, const char* format, ...);
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} // namespace rocksdb
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