org.apache.hadoop.metrics2.util
Class MetricsCache

java.lang.Object
  org.apache.hadoop.metrics2.util.MetricsCache

public class MetricsCache
extends Object

A metrics cache for sinks that don't support sparse updates.

Nested Class Summary

static class

MetricsCache.Record Cached record

Constructor Summary

MetricsCache()

Method Summary

MetricsCache.Record	get(String name, Collection<MetricsTag> tags) Get the cached record
MetricsCache.Record	update(MetricsRecord mr)
MetricsCache.Record	update(MetricsRecord mr, boolean includingTags) Update the cache and return the cached record

Methods inherited from class java.lang.Object

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

Constructor Detail

MetricsCache

public MetricsCache()

Method Detail

update

public MetricsCache.Record update(MetricsRecord mr,
                                  boolean includingTags)

Update the cache and return the cached record

Parameters:

mr - the update record

includingTags - cache tag values (for later lookup by name) if true

Returns:

the updated cached record

update

public MetricsCache.Record update(MetricsRecord mr)

get

public MetricsCache.Record get(String name,
                               Collection<MetricsTag> tags)

Get the cached record

Parameters:

name - of the record

tags - of the record

Returns:

the cached record or null