Package org.apache.kafka.streams.state.internals

Class InMemoryTimeOrderedKeyValueBuffer<K,V>

java.lang.Object

org.apache.kafka.streams.state.internals.InMemoryTimeOrderedKeyValueBuffer<K,V>

All Implemented Interfaces:

StateStore, TimeOrderedKeyValueBuffer<K,V>

public final class InMemoryTimeOrderedKeyValueBuffer<K,V>
extends java.lang.Object
implements TimeOrderedKeyValueBuffer<K,V>

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	InMemoryTimeOrderedKeyValueBuffer.Builder<K,V>

Nested classes/interfaces inherited from interface org.apache.kafka.streams.state.internals.TimeOrderedKeyValueBuffer

TimeOrderedKeyValueBuffer.Eviction<K,V>

Method Summary

Modifier and Type	Method	Description
long	bufferSize()
void	close()	Close the storage engine.
void	evictWhile(java.util.function.Supplier<java.lang.Boolean> predicate, java.util.function.Consumer<TimeOrderedKeyValueBuffer.Eviction<K,V>> callback)
void	flush()	Flush any cached data
void	init(ProcessorContext context, StateStore root)	Initializes this state store.
boolean	isOpen()	Is this store open for reading and writing
long	minTimestamp()
java.lang.String	name()	The name of this store.
int	numRecords()
boolean	persistent()	Return if the storage is persistent or not.
Maybe<ValueAndTimestamp<V>>	priorValueForBuffered(K key)
void	put(long time, K key, Change<V> value, ProcessorRecordContext recordContext)
void	setSerdesIfNull(org.apache.kafka.common.serialization.Serde<K> keySerde, org.apache.kafka.common.serialization.Serde<V> valueSerde)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

name

public java.lang.String name()

Description copied from interface: StateStore

The name of this store.

Specified by:

name in interface StateStore

Returns:

the storage name

persistent

public boolean persistent()

Description copied from interface: StateStore

Return if the storage is persistent or not.

Specified by:

persistent in interface StateStore

Returns:

true if the storage is persistent—false otherwise

setSerdesIfNull

public void setSerdesIfNull(org.apache.kafka.common.serialization.Serde<K> keySerde,
                            org.apache.kafka.common.serialization.Serde<V> valueSerde)

Specified by:

setSerdesIfNull in interface TimeOrderedKeyValueBuffer<K,V>

init

public void init(ProcessorContext context,
                 StateStore root)

Description copied from interface: StateStore

Initializes this state store.

The implementation of this function must register the root store in the context via the ProcessorContext.register(StateStore, StateRestoreCallback) function, where the first StateStore parameter should always be the passed-in root object, and the second parameter should be an object of user's implementation of the StateRestoreCallback interface used for restoring the state store from the changelog.

Note that if the state store engine itself supports bulk writes, users can implement another interface BatchingStateRestoreCallback which extends StateRestoreCallback to let users implement bulk-load restoration logic instead of restoring one record at a time.

Specified by:

init in interface StateStore

isOpen

public boolean isOpen()

Description copied from interface: StateStore

Is this store open for reading and writing

Specified by:

isOpen in interface StateStore

Returns:

true if the store is open

close

public void close()

Description copied from interface: StateStore

Close the storage engine. Note that this function needs to be idempotent since it may be called several times on the same state store.

Users only need to implement this function but should NEVER need to call this api explicitly as it will be called by the library automatically when necessary

Specified by:

close in interface StateStore

flush

public void flush()

Description copied from interface: StateStore

Flush any cached data

Specified by:

flush in interface StateStore

evictWhile

public void evictWhile(java.util.function.Supplier<java.lang.Boolean> predicate,
                       java.util.function.Consumer<TimeOrderedKeyValueBuffer.Eviction<K,V>> callback)

Specified by:

evictWhile in interface TimeOrderedKeyValueBuffer<K,V>

priorValueForBuffered

public Maybe<ValueAndTimestamp<V>> priorValueForBuffered(K key)

Specified by:

priorValueForBuffered in interface TimeOrderedKeyValueBuffer<K,V>

put

public void put(long time,
                K key,
                Change<V> value,
                ProcessorRecordContext recordContext)

Specified by:

put in interface TimeOrderedKeyValueBuffer<K,V>

numRecords

public int numRecords()

Specified by:

numRecords in interface TimeOrderedKeyValueBuffer<K,V>

bufferSize

public long bufferSize()

Specified by:

bufferSize in interface TimeOrderedKeyValueBuffer<K,V>

minTimestamp

public long minTimestamp()

Specified by:

minTimestamp in interface TimeOrderedKeyValueBuffer<K,V>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object