com.launchdarkly.sdk.server.subsystems

Class DataStoreTypes.ItemDescriptor

java.lang.Object

com.launchdarkly.sdk.server.subsystems.DataStoreTypes.ItemDescriptor

Enclosing class:

DataStoreTypes

public static final class DataStoreTypes.ItemDescriptor
extends java.lang.Object

A versioned item (or placeholder) storable in a DataStore.

This is used for data stores that directly store objects as-is, as the default in-memory store does. Items are typed as Object; the store should not know or care what the actual object is.

For any given key within a DataStoreTypes.DataKind, there can be either an existing item with a version, or a "tombstone" placeholder representing a deleted item (also with a version). Deleted item placeholders are used so that if an item is first updated with version N and then deleted with version N+1, but the SDK receives those changes out of order, version N will not overwrite the deletion.

Persistent data stores use DataStoreTypes.SerializedItemDescriptor instead.

Constructor Summary

Constructors

Constructor and Description
ItemDescriptor(int version, java.lang.Object item) Constructs a new instance.

Method Summary

Modifier and Type	Method and Description
static DataStoreTypes.ItemDescriptor	deletedItem(int version) Convenience method for constructing a deleted item placeholder.
boolean	equals(java.lang.Object o)
java.lang.Object	getItem() Returns the data item, or null if this is a placeholder for a deleted item.
int	getVersion() Returns the version number of this data, provided by the SDK.
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ItemDescriptor

public ItemDescriptor(int version,
                      java.lang.Object item)

Constructs a new instance.

Parameters:

version - the version number

item - an object or null

Method Detail

getVersion

public int getVersion()

Returns the version number of this data, provided by the SDK.

Returns:

the version number

getItem

public java.lang.Object getItem()

Returns the data item, or null if this is a placeholder for a deleted item.

Returns:

an object or null

deletedItem

public static DataStoreTypes.ItemDescriptor deletedItem(int version)

Convenience method for constructing a deleted item placeholder.

Parameters:

version - the version number

Returns:

an ItemDescriptor

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object