LogParser (Hadoop 1.2.1 API)
Date: 2013-07-22

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## org.apache.hadoop.contrib.failmon
Class LogParser

    java.lang.Object
      org.apache.hadoop.contrib.failmon.LogParser

All Implemented Interfaces:
  Monitored

Direct Known Subclasses:
  HadoopLogParser, SystemLogParser

    public abstract class LogParser

extends Object
implements Monitored

This class represents objects that provide log parsing functionality. Typically, such objects read log files line by line and for each log entry they identify, they create a corresponding EventRecord. In this way, disparate log files can be merged using the uniform format of EventRecords and can, thus, be processed in a uniform way.

Constructor Summary
`LogParser(String fname)` Create a parser that will read from the specified log file.

Method Summary
`void` | `checkForRotation()` Check whether the log file has been rotated.
`EventRecord` | `getNext()` Continue parsing the log file until a valid log entry is identified.
`BufferedReader` | `getReader()` Return the BufferedReader, that reads the log file
`EventRecord[]` | `monitor()` Get an array of all EventRecords that can be extracted for the represented hardware component.
`void` | `monitor(LocalStore ls)` Insert all EventRecords that can be extracted for the represented hardware component into a LocalStore.
`protected abstract Calendar` | `parseDate(String strDate, String strTime)` Parse a date found in Hadoop log file.
`abstract EventRecord` | `parseLine(String line)` Parses one line of the log.
`protected void` | `setNetworkProperties()`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Methods inherited from interface org.apache.hadoop.contrib.failmon.Monitored
`getInfo`

Constructor Detail

### LogParser

    public LogParser(String fname)

  Create a parser that will read from the specified log file.

  Parameters:
    `fname` - the filename of the log file to be read

Method Detail

### setNetworkProperties

    protected void setNetworkProperties()

### monitor

    public void monitor(LocalStore ls)

  Insert all EventRecords that can be extracted for the represented hardware component into a LocalStore.

  Specified by:
    `monitor` in interface `Monitored`
  Parameters:
    `ls` - the LocalStore into which the EventRecords are to be stored.

### monitor

    public EventRecord[] monitor()

  Get an array of all EventRecords that can be extracted for the represented hardware component.

  Specified by:
    `monitor` in interface `Monitored`
  Returns:
    The array of EventRecords

### getNext

    public EventRecord getNext()

  Continue parsing the log file until a valid log entry is identified. When one such entry is found, parse it and return a corresponding EventRecord.

  Returns:
    The EventRecord corresponding to the next log entry

### getReader

    public BufferedReader getReader()

  Return the BufferedReader, that reads the log file

  Returns:
    The BufferedReader that reads the log file

### checkForRotation

    public void checkForRotation()

  Check whether the log file has been rotated. If so, start reading the file from the beginning.

### parseLine

    public abstract EventRecord parseLine(String line)
                                   throws IOException

  Parses one line of the log. If the line contains a valid log entry, then an appropriate EventRecord is returned, after all relevant fields have been parsed.

  Parameters:
    `line` - the log line to be parsed
  Returns:
    the EventRecord representing the log entry of the line. If the line does not contain a valid log entry, then the EventRecord returned has isValid() = false. When the end-of-file has been reached, null is returned to the caller.
  Throws:
    `IOException`

### parseDate

    protected abstract Calendar parseDate(String strDate,
                                          String strTime)

  Parse a date found in Hadoop log file.

  Returns:
    a Calendar representing the date

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