Package org.apache.storm.windowing.persistence

Class WindowState<T>

java.lang.Object

java.util.AbstractCollection<Event<T>>

org.apache.storm.windowing.persistence.WindowState<T>

All Implemented Interfaces:

Iterable<Event<T>>, Collection<Event<T>>

public class WindowState<T>
extends AbstractCollection<Event<T>>

A wrapper around the window related states that are checkpointed.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WindowState.WindowPartition<T>

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAX_PARTITION_EVENTS
static final int	MIN_PARTITIONS

Constructor Summary

Constructors

Constructor	Description
WindowState(KeyValueState<Long,WindowState.WindowPartition<T>> windowPartitionsState, KeyValueState<String,Deque<Long>> partitionIdsState, KeyValueState<String,Optional<?>> windowSystemState, Supplier<Map<String,Optional<?>>> windowSystemStateSupplier, long maxEventsInMemory)

Method Summary

Modifier and Type	Method	Description
boolean	add(Event<T> event)
void	clearIteratorPins()
void	commit(long txid)	Commits the WindowState.
Iterator<Event<T>>	iterator()
void	prepareCommit(long txid)	Prepares the WindowState for commit.
void	rollback(boolean reInit)	Rolls back the WindowState.
int	size()

Methods inherited from class java.util.AbstractCollection

addAll, clear, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Collection

equals, hashCode, parallelStream, removeIf, spliterator, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Field Details

MAX_PARTITION_EVENTS

public static final int MAX_PARTITION_EVENTS

See Also:

• Constant Field Values

MIN_PARTITIONS

public static final int MIN_PARTITIONS

See Also:

• Constant Field Values

Constructor Details

WindowState

public WindowState(KeyValueState<Long,WindowState.WindowPartition<T>> windowPartitionsState,
 KeyValueState<String,Deque<Long>> partitionIdsState,
 KeyValueState<String,Optional<?>> windowSystemState,
 Supplier<Map<String,Optional<?>>> windowSystemStateSupplier,
 long maxEventsInMemory)

Method Details

add

public boolean add(Event<T> event)

Specified by:

add in interface Collection<T>

Overrides:

add in class AbstractCollection<Event<T>>

iterator

public Iterator<Event<T>> iterator()

Specified by:

iterator in interface Collection<T>

Specified by:

iterator in interface Iterable<T>

Specified by:

iterator in class AbstractCollection<Event<T>>

clearIteratorPins

public void clearIteratorPins()

size

public int size()

Specified by:

size in interface Collection<T>

Specified by:

size in class AbstractCollection<Event<T>>

prepareCommit

public void prepareCommit(long txid)

Prepares the WindowState for commit.

Parameters:

txid - the transaction id

commit

public void commit(long txid)

Commits the WindowState.

Parameters:

txid - the transaction id

rollback

public void rollback(boolean reInit)

Rolls back the WindowState.

Parameters:

reInit - if the members should be synced with the values from the state.