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

Class RocksDBSessionStore

java.lang.Object

org.apache.kafka.streams.state.internals.WrappedStateStore<SegmentedBytesStore,Object,Object>

org.apache.kafka.streams.state.internals.RocksDBSessionStore

All Implemented Interfaces:

StateStore, CachedStateStore<Object,Object>, ReadOnlySessionStore<org.apache.kafka.common.utils.Bytes,byte[]>, SessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

public class RocksDBSessionStore
extends WrappedStateStore<SegmentedBytesStore,Object,Object>
implements SessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Method Summary

Modifier and Type	Method	Description
KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]>	fetch(org.apache.kafka.common.utils.Bytes key)	Retrieve all aggregated sessions for the provided key.
KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]>	fetch(org.apache.kafka.common.utils.Bytes from, org.apache.kafka.common.utils.Bytes to)	Retrieve all aggregated sessions for the given range of keys.
byte[]	fetchSession(org.apache.kafka.common.utils.Bytes key, long startTime, long endTime)	Get the value of key from a single session.
KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]>	findSessions(org.apache.kafka.common.utils.Bytes key, long earliestSessionEndTime, long latestSessionStartTime)	Fetch any sessions with the matching key and the sessions end is ≥ earliestSessionEndTime and the sessions start is ≤ latestSessionStartTime This iterator must be closed after use.
KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]>	findSessions(org.apache.kafka.common.utils.Bytes keyFrom, org.apache.kafka.common.utils.Bytes keyTo, long earliestSessionEndTime, long latestSessionStartTime)	Fetch any sessions in the given range of keys and the sessions end is ≥ earliestSessionEndTime and the sessions start is ≤ latestSessionStartTime This iterator must be closed after use.
void	put(Windowed<org.apache.kafka.common.utils.Bytes> sessionKey, byte[] aggregate)	Write the aggregated value for the provided key to the store
void	remove(Windowed<org.apache.kafka.common.utils.Bytes> key)	Remove the session aggregated with provided Windowed key from the store

Methods inherited from class org.apache.kafka.streams.state.internals.WrappedStateStore

close, flush, init, isOpen, isTimestamped, name, persistent, setFlushListener, wrapped

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.kafka.streams.processor.StateStore

close, flush, init, isOpen, name, persistent

Method Detail

findSessions

public KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]> findSessions(org.apache.kafka.common.utils.Bytes key,
                                                                                                 long earliestSessionEndTime,
                                                                                                 long latestSessionStartTime)

Description copied from interface: SessionStore

Fetch any sessions with the matching key and the sessions end is ≥ earliestSessionEndTime and the sessions start is ≤ latestSessionStartTime This iterator must be closed after use.

Specified by:

findSessions in interface SessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Parameters:

key - the key to return sessions for

earliestSessionEndTime - the end timestamp of the earliest session to search for

latestSessionStartTime - the end timestamp of the latest session to search for

Returns:

iterator of sessions with the matching key and aggregated values

findSessions

public KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]> findSessions(org.apache.kafka.common.utils.Bytes keyFrom,
                                                                                                 org.apache.kafka.common.utils.Bytes keyTo,
                                                                                                 long earliestSessionEndTime,
                                                                                                 long latestSessionStartTime)

Description copied from interface: SessionStore

Fetch any sessions in the given range of keys and the sessions end is ≥ earliestSessionEndTime and the sessions start is ≤ latestSessionStartTime This iterator must be closed after use.

Specified by:

findSessions in interface SessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Parameters:

keyFrom - The first key that could be in the range

keyTo - The last key that could be in the range

earliestSessionEndTime - the end timestamp of the earliest session to search for

latestSessionStartTime - the end timestamp of the latest session to search for

Returns:

iterator of sessions with the matching keys and aggregated values

fetchSession

public byte[] fetchSession(org.apache.kafka.common.utils.Bytes key,
                           long startTime,
                           long endTime)

Description copied from interface: SessionStore

Get the value of key from a single session.

Specified by:

fetchSession in interface SessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Parameters:

key - the key to fetch

startTime - start timestamp of the session

endTime - end timestamp of the session

Returns:

The value or null if no session associated with the key can be found

fetch

public KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]> fetch(org.apache.kafka.common.utils.Bytes key)

Description copied from interface: ReadOnlySessionStore

Retrieve all aggregated sessions for the provided key. This iterator must be closed after use. For each key, the iterator guarantees ordering of sessions, starting from the oldest/earliest available session to the newest/latest session.

Specified by:

fetch in interface ReadOnlySessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Parameters:

key - record key to find aggregated session values for

Returns:

KeyValueIterator containing all sessions for the provided key.

fetch

public KeyValueIterator<Windowed<org.apache.kafka.common.utils.Bytes>,byte[]> fetch(org.apache.kafka.common.utils.Bytes from,
                                                                                          org.apache.kafka.common.utils.Bytes to)

Description copied from interface: ReadOnlySessionStore

Retrieve all aggregated sessions for the given range of keys. This iterator must be closed after use. For each key, the iterator guarantees ordering of sessions, starting from the oldest/earliest available session to the newest/latest session.

Specified by:

fetch in interface ReadOnlySessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Parameters:

from - first key in the range to find aggregated session values for

to - last key in the range to find aggregated session values for

Returns:

KeyValueIterator containing all sessions for the provided key.

remove

public void remove(Windowed<org.apache.kafka.common.utils.Bytes> key)

Description copied from interface: SessionStore

Remove the session aggregated with provided Windowed key from the store

Specified by:

remove in interface SessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Parameters:

key - key of the session to remove

put

public void put(Windowed<org.apache.kafka.common.utils.Bytes> sessionKey,
                byte[] aggregate)

Description copied from interface: SessionStore

Write the aggregated value for the provided key to the store

Specified by:

put in interface SessionStore<org.apache.kafka.common.utils.Bytes,byte[]>

Parameters:

sessionKey - key of the session to write

aggregate - the aggregated value for the session, it can be null; if the serialized bytes are also null it is interpreted as deletes