io.druid.segment.data

Class CachingIndexed<T>

java.lang.Object

io.druid.segment.data.CachingIndexed<T>

All Implemented Interfaces:

Indexed<T>, Closeable, AutoCloseable, Iterable<T>

public class CachingIndexed<T>
extends Object
implements Indexed<T>, Closeable

Field Summary

Fields

Modifier and Type	Field and Description
static int	INITIAL_CACHE_CAPACITY

Constructor Summary

Constructors

Constructor and Description
CachingIndexed(GenericIndexed<T> delegate, int lookupCacheSize) Creates a CachingIndexed wrapping the given GenericIndexed with a value lookup cache CachingIndexed objects are not thread safe and should only be used by a single thread at a time.

Method Summary

Modifier and Type	Method and Description
void	close()
T	get(int index)
Class<? extends T>	getClazz()
int	indexOf(T value) Returns the index of "value" in this Indexed object, or a negative number if the value is not present.
Iterator<T>	iterator()
int	size()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

INITIAL_CACHE_CAPACITY

public static final int INITIAL_CACHE_CAPACITY

See Also:

Constant Field Values

Constructor Detail

CachingIndexed

public CachingIndexed(GenericIndexed<T> delegate,
                      int lookupCacheSize)

Creates a CachingIndexed wrapping the given GenericIndexed with a value lookup cache CachingIndexed objects are not thread safe and should only be used by a single thread at a time. CachingIndexed objects must be closed to release any underlying cache resources.

Parameters:

delegate - the GenericIndexed to wrap with a lookup cache.

lookupCacheSize - maximum size in bytes of the lookup cache if greater than zero

Method Detail

getClazz

public Class<? extends T> getClazz()

Specified by:

getClazz in interface Indexed<T>

size

public int size()

Specified by:

size in interface Indexed<T>

get

public T get(int index)

Specified by:

get in interface Indexed<T>

indexOf

public int indexOf(T value)

Description copied from interface: Indexed

Returns the index of "value" in this Indexed object, or a negative number if the value is not present. The negative number is not guaranteed to be any particular number. Subclasses may tighten this contract (GenericIndexed does this).

Specified by:

indexOf in interface Indexed<T>

Parameters:

value - value to search for

Returns:

index of value, or a negative number

iterator

public Iterator<T> iterator()

Specified by:

iterator in interface Iterable<T>

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException