org.apache.hadoop.mapred
Class Counters.Group

java.lang.Object
  org.apache.hadoop.mapred.Counters.Group

All Implemented Interfaces:

Iterable<Counters.Counter>, Writable

Enclosing class:

Counters

public static class Counters.Group
extends Object
implements Writable, Iterable<Counters.Counter>

Group of counters, comprising of counters from a particular counter Enum class.

Grouphandles localization of the class name and the counter names.

Method Summary

Counters.Counter	getCounter(int id, String name) Deprecated. use getCounter(String) instead
long	getCounter(String counterName) Returns the value of the specified counter, or 0 if the counter does not exist.
Counters.Counter	getCounterForName(String name) Get the counter for the given name and create it if it doesn't exist.
String	getDisplayName() Returns localized name of the group.
String	getName() Returns raw name of the group.
Iterator<Counters.Counter>	iterator()
void	readFields(DataInput in) Deserialize the fields of this object from in.
int	size() Returns the number of counters in this group.
void	write(DataOutput out) Serialize the fields of this object to out.

Methods inherited from class java.lang.Object

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

Method Detail

getName

public String getName()

Returns raw name of the group. This is the name of the enum class for this group of counters.

getDisplayName

public String getDisplayName()

Returns localized name of the group. This is the same as getName() by default, but different if an appropriate ResourceBundle is found.

getCounter

public long getCounter(String counterName)

Returns the value of the specified counter, or 0 if the counter does not exist.

getCounter

@Deprecated
public Counters.Counter getCounter(int id,
                                              String name)

Deprecated. use getCounter(String) instead

Get the counter for the given id and create it if it doesn't exist.

Parameters:

id - the numeric id of the counter within the group

name - the internal counter name

Returns:

the counter

getCounterForName

public Counters.Counter getCounterForName(String name)

Get the counter for the given name and create it if it doesn't exist.

Parameters:

name - the internal counter name

Returns:

the counter

size

public int size()

Returns the number of counters in this group.

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

Serialize the fields of this object to out.

Specified by:

write in interface Writable

Parameters:

out - DataOuput to serialize this object into.

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

Specified by:

readFields in interface Writable

Parameters:

in - DataInput to deseriablize this object from.

Throws:

IOException

iterator

public Iterator<Counters.Counter> iterator()

Specified by:

iterator in interface Iterable<Counters.Counter>