content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.
   */
  package org.apache.asterix.common.transactions;
  
  import java.io.Serializable;
  
  import org.apache.asterix.common.config.TransactionProperties;
  
  public class LogManagerProperties implements Serializable {
  
      private static final long serialVersionUID = 2084227360840799662L;
  
      public static final String lineSeparator = System.getProperty("line.separator");
      private static final String DEFAULT_LOG_FILE_PREFIX = "transaction_log";
  
      // follow the naming convention <logFilePrefix>_<number> where number starts from 0
      private final String logFilePrefix;
      private final String logDir;
  
      // number of log pages in the log buffer
      private final int logPageSize;
      // number of log pages in the log buffer.
      private final int numLogPages;
      // maximum size of each log file
      private final long logPartitionSize;
  
      public LogManagerProperties(TransactionProperties txnProperties, String nodeId) {
          this.logPageSize = txnProperties.getLogBufferPageSize();
          this.numLogPages = txnProperties.getLogBufferNumPages();
          long logPartitionSize = txnProperties.getLogPartitionSize();
          this.logDir = txnProperties.getLogDirectory(nodeId);
          this.logFilePrefix = DEFAULT_LOG_FILE_PREFIX;
          int logBufferSize = logPageSize * numLogPages;
          //make sure that the log partition size is the multiple of log buffer size.
          this.logPartitionSize = (logPartitionSize / logBufferSize) * logBufferSize;
      }
  
      public long getLogPartitionSize() {
          return logPartitionSize;
      }
  
      public String getLogFilePrefix() {
          return logFilePrefix;
      }
  
      public String getLogDir() {
          return logDir;
      }
  
      public int getLogPageSize() {
          return logPageSize;
      }
  
      public int getNumLogPages() {
          return numLogPages;
      }
  
      @Override
      public String toString() {
          StringBuilder builder = new StringBuilder();
          builder.append("log_dir_ : " + logDir + lineSeparator);
          builder.append("log_file_prefix" + logFilePrefix + lineSeparator);
          builder.append("log_page_size : " + logPageSize + lineSeparator);
          builder.append("num_log_pages : " + numLogPages + lineSeparator);
          builder.append("log_partition_size : " + logPartitionSize + lineSeparator);
          return builder.toString();
      }
  }
  