org.apache.druid.segment.data

Class CachingIndexed<T>

java.lang.Object

org.apache.druid.segment.data.CachingIndexed<T>

All Implemented Interfaces:

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

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

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)
int	indexOf(T value) Returns the index of "value" in this Indexed object, or a negative number if the value is not present.
void	inspectRuntimeShape(RuntimeShapeInspector inspector) Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1.
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

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

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(@Nullable
                   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()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

inspectRuntimeShape

public void inspectRuntimeShape(RuntimeShapeInspector inspector)

Description copied from interface: HotLoopCallee

Implementations of this method should call inspector.visit() with all fields of this class, which meet two conditions: 1. They are used in methods of this class, annotated with CalledFromHotLoop 2. They are either: a. Nullable objects b. Instances of HotLoopCallee c. Objects, which don't always have a specific class in runtime. For example, a field of type Set could be HashSet or TreeSet in runtime, depending on how this instance (the instance on which inspectRuntimeShape() is called) is configured. d. ByteBuffer or similar objects, where byte order matters e. boolean flags, affecting branch taking f. Arrays of objects, meeting any of conditions a-e.

Specified by:

inspectRuntimeShape in interface HotLoopCallee