LongCounter.java

/*
** Module   : LongCounter.java
** Abstract : Helper interface for accumulating <code>long</code> values. 
**
** Copyright (c) 2020, Golden Code Development Corporation.
**
** -#- -I- --Date-- ---------------------------------Description----------------------------------
** 001 IAS 20200930 Created initial version.
** 002 IAS 20201001 Added dump of MBean state.
*/ 

/*
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU Affero General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU Affero General Public License for more details.
**
** You may find a copy of the GNU Affero GPL version 3 at the following
** location: https://www.gnu.org/licenses/agpl-3.0.en.html
** 
** Additional terms under GNU Affero GPL version 3 section 7:
** 
**   Under Section 7 of the GNU Affero GPL version 3, the following additional
**   terms apply to the works covered under the License.  These additional terms
**   are non-permissive additional terms allowed under Section 7 of the GNU
**   Affero GPL version 3 and may not be removed by you.
** 
**   0. Attribution Requirement.
** 
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**     work or Appropriate Legal Notices displayed by works containing the covered
**     work.  You may not remove from the covered work any author or developer
**     credit already included within the covered work.
** 
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**     This license does not grant any license or rights to use the trademarks
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*/

package com.goldencode.p2j.jmx;

import java.io.*;
import java.text.*;
import java.util.*;

/** Helper interface for accumulating <code>long</code> values */
public interface LongCounter
{
   /**
    * Update counter
    * @param value
    *        new value
    */
   public void update(long value);
   
   /**
    * Print counters' values to the file
    * @param comment 
    *        comment
    * @param file 
    *        output file name (will be appended if exists)
    * @throws IOException 
    */
   public default void dump(String comment, String file) throws IOException
   {
      if (file == null || file.trim().isEmpty())
      {
         file = "fwd-counters.txt";
      }
      String ts = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date());
      try(FileWriter fw = new FileWriter(file, true);
          BufferedWriter bw = new BufferedWriter(fw);
          PrintWriter out = new PrintWriter(bw))
      {
        out.println(toString(ts, comment));
      } 
   }

   /**
    * Return the string representation of the counter
    * 
    * @param ts
    * @param comment
    *        comment
    * @return string representation of the counter
    * @throws IOException
    */
   public String toString(String ts, String comment)  throws IOException;
}