org.apache.hadoop.util

Class ProgramDriver

java.lang.Object

org.apache.hadoop.util.ProgramDriver

@InterfaceAudience.LimitedPrivate(value={"HDFS","MapReduce"})
@InterfaceStability.Unstable
public class ProgramDriver
extends Object

A driver that is used to run programs added to it

Constructor Summary

Constructors

Constructor and Description
ProgramDriver()

Method Summary

Methods

Modifier and Type	Method and Description
void	addClass(String name, Class mainClass, String description) This is the method that adds the classed to the repository
void	driver(String[] argv) API compatible with Hadoop 1.x
int	run(String[] args) This is a driver for the example programs.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ProgramDriver

public ProgramDriver()

Method Detail

addClass

public void addClass(String name,
            Class mainClass,
            String description)
              throws Throwable

This is the method that adds the classed to the repository

Parameters:

name - The name of the string you want the class instance to be called with

mainClass - The class that you want to add to the repository

description - The description of the class

Throws:

NoSuchMethodException

SecurityException

Throwable

run

public int run(String[] args)
        throws Throwable

This is a driver for the example programs. It looks at the first command line argument and tries to find an example program with that name. If it is found, it calls the main method in that class with the rest of the command line arguments.

Parameters:

args - The argument from the user. args[0] is the command to run.

Returns:

-1 on error, 0 on success

Throws:

NoSuchMethodException

SecurityException

IllegalAccessException

IllegalArgumentException

Throwable - Anything thrown by the example program's main

driver

public void driver(String[] argv)
            throws Throwable

API compatible with Hadoop 1.x

Throws:

Throwable