io.druid.segment

Class ReferenceCountingSegment

java.lang.Object

io.druid.segment.AbstractSegment

io.druid.segment.ReferenceCountingSegment

All Implemented Interfaces:

Segment, Closeable, AutoCloseable

public class ReferenceCountingSegment
extends AbstractSegment

Constructor Summary

Constructors

Constructor and Description
ReferenceCountingSegment(Segment baseSegment)

Method Summary

Modifier and Type	Method and Description
<T> T	as(Class<T> clazz) Request an implementation of a particular interface.
QueryableIndex	asQueryableIndex()
StorageAdapter	asStorageAdapter()
void	close()
Segment	getBaseSegment()
org.joda.time.Interval	getDataInterval()
String	getIdentifier()
int	getNumReferences()
Closeable	increment()
boolean	isClosed()

Methods inherited from class java.lang.Object

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

Constructor Detail

ReferenceCountingSegment

public ReferenceCountingSegment(Segment baseSegment)

Method Detail

getBaseSegment

public Segment getBaseSegment()

getNumReferences

public int getNumReferences()

isClosed

public boolean isClosed()

getIdentifier

public String getIdentifier()

getDataInterval

public org.joda.time.Interval getDataInterval()

asQueryableIndex

public QueryableIndex asQueryableIndex()

asStorageAdapter

public StorageAdapter asStorageAdapter()

close

public void close()
           throws IOException

Throws:

IOException

increment

public Closeable increment()

as

public <T> T as(Class<T> clazz)

Description copied from interface: Segment

Request an implementation of a particular interface. If the passed-in interface is QueryableIndex or StorageAdapter, then this method behaves identically to Segment.asQueryableIndex() or Segment.asStorageAdapter(). Other interfaces are only expected to be requested by callers that have specific knowledge of extra features provided by specific segment types. For example, an extension might provide a custom Segment type that can offer both StorageAdapter and some new interface. That extension can also offer a Query that uses that new interface. Implementations which accept classes other than QueryableIndex or StorageAdapter are limited to using those classes within the extension. This means that one extension cannot rely on the `Segment.as` behavior of another extension.

Specified by:

as in interface Segment

Overrides:

as in class AbstractSegment

Type Parameters:

T - desired interface

Parameters:

clazz - desired interface

Returns:

instance of clazz, or null if the interface is not supported by this segment