Package com.launchdarkly.sdk.server.subsystems

Class DataStoreTypes.DataKind

java.lang.Object

com.launchdarkly.sdk.server.subsystems.DataStoreTypes.DataKind

Enclosing class:

DataStoreTypes

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

Represents a separately namespaced collection of storable data items.

The SDK passes instances of this type to the data store to specify whether it is referring to a feature flag, a user segment, etc. The data store implementation should not look for a specific data kind (such as feature flags), but should treat all data kinds generically.

Constructor Summary

Constructors

Constructor	Description
DataKind(java.lang.String name, java.util.function.Function<DataStoreTypes.ItemDescriptor,java.lang.String> serializer, java.util.function.Function<java.lang.String,DataStoreTypes.ItemDescriptor> deserializer)	Constructs a DataKind instance.

Method Summary

Modifier and Type	Method	Description
DataStoreTypes.ItemDescriptor	deserialize(java.lang.String s)	Creates an item of this kind from its serialized representation.
java.lang.String	getName()	A case-sensitive alphabetic string that uniquely identifies this data kind.
java.lang.String	serialize(DataStoreTypes.ItemDescriptor item)	Returns a serialized representation of an item of this kind.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

DataKind

public DataKind(java.lang.String name,
                java.util.function.Function<DataStoreTypes.ItemDescriptor,java.lang.String> serializer,
                java.util.function.Function<java.lang.String,DataStoreTypes.ItemDescriptor> deserializer)

Constructs a DataKind instance.

Parameters:

name - the value for getName()

serializer - the function to use for serialize(DataStoreTypes.ItemDescriptor)

deserializer - the function to use for deserialize(String)

Method Detail

getName

public java.lang.String getName()

A case-sensitive alphabetic string that uniquely identifies this data kind.

This is in effect a namespace for a collection of items of the same kind. Item keys must be unique within that namespace. Persistent data store implementations could use this string as part of a composite key or table name.

Returns:

the namespace string

serialize

public java.lang.String serialize(DataStoreTypes.ItemDescriptor item)

Returns a serialized representation of an item of this kind.

The SDK uses this function to generate the data that is stored by a PersistentDataStore. Store implementations normally do not need to call it, except in a special case described in the documentation for PersistentDataStore regarding deleted item placeholders.

Parameters:

item - an DataStoreTypes.ItemDescriptor describing the object to be serialized

Returns:

the serialized representation

Throws:

java.lang.ClassCastException - if the object is of the wrong class

deserialize

public DataStoreTypes.ItemDescriptor deserialize(java.lang.String s)

Creates an item of this kind from its serialized representation.

The SDK uses this function to translate data that is returned by a PersistentDataStore. Store implementations do not normally need to call it, but there is a special case described in the documentation for PersistentDataStore, regarding updates.

The returned DataStoreTypes.ItemDescriptor has two properties: DataStoreTypes.ItemDescriptor.getItem(), which is the deserialized object or a null value for a deleted item placeholder, and DataStoreTypes.ItemDescriptor.getVersion(), which provides the object's version number regardless of whether it is deleted or not.

Parameters:

s - the serialized representation

Returns:

an DataStoreTypes.ItemDescriptor describing the deserialized object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object