Package org.apache.cassandra.spark.bulkwriter.cloudstorage.coordinated

Class MultiClusterContainer<T>

java.lang.Object

org.apache.cassandra.spark.bulkwriter.cloudstorage.coordinated.MultiClusterContainer<T>

Type Parameters:

T - value type

All Implemented Interfaces:

java.io.Serializable, MultiClusterSupport<T>

public class MultiClusterContainer<T>
extends java.lang.Object
implements java.io.Serializable, MultiClusterSupport<T>

A container to hold values per cluster. Each value is identified by its belonging cluster id. It is compatible with single cluster, i.e. no cluster id is defined for the value. Pass null clusterId to get the value. However, the container does not permit holding values for both multi-cluster case and single cluster case; otherwise, IllegalStateException is thrown.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
MultiClusterContainer()

Method Summary

Modifier and Type	Method	Description
void	addAll(java.util.Map<java.lang.String,T> clusters)	Add all values from the map
boolean	equals(java.lang.Object obj)
void	forEach(java.util.function.BiConsumer<java.lang.String,T> action)	Iterate through all values
T	getAnyValue()
T	getAnyValueOrThrow()
T	getValueOrNull(java.lang.String clusterId)	Look up a value based on clusterId
int	hashCode()
static <T> MultiClusterContainer<T>	ofSingle(T value)
void	setValue(java.lang.String clusterId, T value)	Set the value for a cluster
int	size()
void	updateValue(java.lang.String clusterId, java.util.function.UnaryOperator<T> valueUpdater)	Update the value associated with the clusterId

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.spark.bulkwriter.cloudstorage.coordinated.MultiClusterSupport

getValueOrThrow

Constructor Detail

MultiClusterContainer

public MultiClusterContainer()

Method Detail

ofSingle

public static <T> MultiClusterContainer<T> ofSingle(T value)

getValueOrNull

@Nullable
public T getValueOrNull(@Nullable
                        java.lang.String clusterId)

Description copied from interface: MultiClusterSupport

Look up a value based on clusterId

Specified by:

getValueOrNull in interface MultiClusterSupport<T>

Parameters:

clusterId - cluster id

Returns:

the value of type T associated with the clusterId, or null if not found

getAnyValue

@Nullable
public T getAnyValue()

Returns:

any value in the container. Null is returned if the container is empty.

getAnyValueOrThrow

@NotNull
public T getAnyValueOrThrow()
                     throws java.util.NoSuchElementException

Returns:

any value in the container

Throws:

java.util.NoSuchElementException - when no value can be found

size

public int size()

Specified by:

size in interface MultiClusterSupport<T>

Returns:

the total number of clusters

forEach

public void forEach(java.util.function.BiConsumer<java.lang.String,T> action)

Description copied from interface: MultiClusterSupport

Iterate through all values

Specified by:

forEach in interface MultiClusterSupport<T>

Parameters:

action - function to consume the values

setValue

public void setValue(@Nullable
                     java.lang.String clusterId,
                     @NotNull
                     T value)

Set the value for a cluster

Parameters:

clusterId - nullable cluster id. When the value is null, it reads from the single value

updateValue

public void updateValue(@Nullable
                        java.lang.String clusterId,
                        java.util.function.UnaryOperator<T> valueUpdater)

Update the value associated with the clusterId

Parameters:

clusterId - nullable cluster id. When the value is null, it updates the single value

valueUpdater - function to update the value; if not prior value exist, the updater receives null as input, If the updater returns null, the value associated with the cluster is removed

addAll

public void addAll(java.util.Map<java.lang.String,T> clusters)

Add all values from the map

Parameters:

clusters - map of value per cluster

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object