Dhruba Borthakur
12 years ago
commit
53e04311b1
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// Logger implementation that can be shared by all environments
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// where enough posix functionality is available.
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#ifndef STORAGE_LEVELDB_UTIL_SPLIT_LOGGER_LOGGER_H_ |
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#define STORAGE_LEVELDB_UTIL_SPLIT_LOGGER_LOGGER_H_ |
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#include "util/posix_logger.h" |
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#include "db/filename.h" |
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namespace leveldb { |
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// AutoSplitLogger can automatically create a new log file
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// if the file size exceeds the limit.
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//
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// The template parameter "UnderlyingLogger" can be any Logger class
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// that has the method "GetLogFileSize()" and "ResetFile()"
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template<class UnderlyingLogger> |
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class AutoSplitLogger : public Logger { |
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private: |
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std::string log_fname_; // Current active info log's file name.
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std::string dbname_; |
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std::string db_log_dir_; |
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std::string db_absolute_path_; |
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Env* env_; |
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UnderlyingLogger* logger_; |
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const size_t MAX_LOG_FILE_SIZE; |
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Status status_; |
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public: |
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AutoSplitLogger(Env* env, const std::string& dbname, |
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const std::string& db_log_dir, size_t log_max_size): |
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env_(env), dbname_(dbname), db_log_dir_(db_log_dir), |
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MAX_LOG_FILE_SIZE(log_max_size), status_(Status::OK()) { |
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env->GetAbsolutePath(dbname, &db_absolute_path_); |
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log_fname_ = InfoLogFileName(dbname_, db_absolute_path_, db_log_dir_); |
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InitLogger(); |
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} |
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~AutoSplitLogger() { delete logger_; } |
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virtual void Logv(const char* format, va_list ap) { |
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assert(GetStatus().ok()); |
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logger_->Logv(format, ap); |
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// Check if the log file should be splitted.
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if (logger_->GetLogFileSize() > MAX_LOG_FILE_SIZE) { |
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delete logger_; |
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std::string old_fname = OldInfoLogFileName( |
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dbname_, env_->NowMicros(), db_absolute_path_, db_log_dir_); |
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env_->RenameFile(log_fname_, old_fname); |
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InitLogger(); |
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} |
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} |
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// check if the logger has any problem.
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Status GetStatus() { |
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return status_; |
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} |
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private: |
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Status InitLogger() { |
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status_ = env_->NewLogger(log_fname_, &logger_); |
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if (!status_.ok()) { |
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logger_ = NULL; |
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} |
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if (logger_->GetLogFileSize() == |
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Logger::DO_NOT_SUPPORT_GET_LOG_FILE_SIZE) { |
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status_ = Status::NotSupported( |
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"The underlying logger doesn't support GetLogFileSize()"); |
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} |
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return status_; |
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} |
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}; // class AutoSplitLogger
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_UTIL_SPLIT_LOGGER_LOGGER_H_
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