simple-logger.h

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// Copyright 2012 Cloudera Inc.
//
// 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.

#ifndef IMPALA_SERVICE_SIMPLE_LOGGER_H
#define IMPALA_SERVICE_SIMPLE_LOGGER_H

#include <boost/thread/thread.hpp>
#include <fstream>

#include "common/status.h"

namespace impala {

class SimpleLogger {
 public:
  SimpleLogger(const std::string& log_dir_, const std::string& log_file_name_prefix_,
      uint64_t max_entries_per_file);

  Status Init();

  Status AppendEntry(const std::string& entry);

  Status Flush();

 private:
  boost::mutex log_file_lock_;

  std::string log_dir_;

  std::string log_file_name_prefix_;

  uint64_t num_log_file_entries_;

  uint64_t max_entries_per_file_;

  std::ofstream log_file_;

  std::string log_file_name_;

  void GenerateLogFileName();

  Status FlushInternal();
};
}
#endif