org.apache.hadoop.mapreduce.counters

クラス AbstractCounters<C extends Counter,G extends CounterGroupBase<C>>

java.lang.Object

org.apache.hadoop.mapreduce.counters.AbstractCounters<C,G>

型パラメータ:

C - type of counter inside the counters

G - type of group inside the counters

すべての実装されたインタフェース:

Iterable<G>, Writable

直系の既知のサブクラス:

Counters, Counters

@InterfaceAudience.Public
 @InterfaceStability.Stable
public abstract class AbstractCounters<C extends Counter,G extends CounterGroupBase<C>>
extends Object
implements Writable, Iterable<G>

An abstract class to provide common implementation for the Counters container in both mapred and mapreduce packages.

フィールドのサマリー

フィールド

修飾子とタイプ	フィールドと説明
protected static org.apache.commons.logging.Log	LOG

コンストラクタのサマリー

コンストラクタ

コンストラクタと説明
AbstractCounters(AbstractCounters<C1,G1> counters, org.apache.hadoop.mapreduce.counters.CounterGroupFactory<C,G> groupFactory) Construct from another counters object.
AbstractCounters(org.apache.hadoop.mapreduce.counters.CounterGroupFactory<C,G> gf)

メソッドのサマリー

修飾子とタイプ	メソッドと説明
int	countCounters() Returns the total number of counters, by summing the number of counters in each group.
boolean	equals(Object genericRight)
C	findCounter(Enum<?> key) Find the counter for the given enum.
C	findCounter(String groupName, String counterName) Find a counter, create one if necessary
G	getGroup(String groupName) Returns the named counter group, or an empty group if there is none with the specified name.
Iterable<String>	getGroupNames() Returns the names of all counter classes.
int	hashCode()
void	incrAllCounters(AbstractCounters<C,G> other) Increments multiple counters by their amounts in another Counters instance.
Iterator<G>	iterator()
void	readFields(DataInput in) Deserialize the fields of this object from in.
String	toString() Return textual representation of the counter values.
void	write(DataOutput out) Write the set of groups.

クラスから継承されたメソッド java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

インタフェースから継承されたメソッド java.lang.Iterable

forEach, spliterator

フィールドの詳細

LOG

protected static final org.apache.commons.logging.Log LOG

コンストラクタの詳細

AbstractCounters

@InterfaceAudience.Private
public AbstractCounters(org.apache.hadoop.mapreduce.counters.CounterGroupFactory<C,G> gf)

AbstractCounters

@InterfaceAudience.Private
public AbstractCounters(AbstractCounters<C1,G1> counters,
                                                   org.apache.hadoop.mapreduce.counters.CounterGroupFactory<C,G> groupFactory)

Construct from another counters object.

型パラメータ:

C1 - type of the other counter

G1 - type of the other counter group

パラメータ:

counters - the counters object to copy

groupFactory - the factory for new groups

メソッドの詳細

findCounter

public C findCounter(String groupName,
                     String counterName)

Find a counter, create one if necessary

パラメータ:

groupName - of the counter

counterName - name of the counter

戻り値:

the matching counter

findCounter

public C findCounter(Enum<?> key)

Find the counter for the given enum. The same enum will always return the same counter.

パラメータ:

key - the counter key

戻り値:

the matching counter object

getGroupNames

public Iterable<String> getGroupNames()

Returns the names of all counter classes.

戻り値:

Set of counter names.

iterator

public Iterator<G> iterator()

定義:

iterator インタフェース内 Iterable<G extends CounterGroupBase<C>>

getGroup

public G getGroup(String groupName)

Returns the named counter group, or an empty group if there is none with the specified name.

パラメータ:

groupName - name of the group

戻り値:

the group

countCounters

public int countCounters()

Returns the total number of counters, by summing the number of counters in each group.

戻り値:

the total number of counters

write

public void write(DataOutput out)
           throws IOException

Write the set of groups. Counters ::= version #fgroups (groupId, group)* #groups (group)*

定義:

write インタフェース内 Writable

パラメータ:

out - DataOuput to serialize this object into.

例外:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

インタフェースからコピーされた説明: Writable

Deserialize the fields of this object from in.

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

定義:

readFields インタフェース内 Writable

パラメータ:

in - DataInput to deseriablize this object from.

例外:

IOException

toString

public String toString()

Return textual representation of the counter values.

オーバーライド:

toString クラス内 Object

戻り値:

the string

incrAllCounters

public void incrAllCounters(AbstractCounters<C,G> other)

Increments multiple counters by their amounts in another Counters instance.

パラメータ:

other - the other Counters instance

equals

public boolean equals(Object genericRight)

オーバーライド:

equals クラス内 Object

hashCode

public int hashCode()

オーバーライド:

hashCode クラス内 Object