Package org.pipservices3.components.state

Class NullStateStore

java.lang.Object

org.pipservices3.components.state.NullStateStore

All Implemented Interfaces:

IStateStore

public class NullStateStore
extends Object
implements IStateStore

Dummy state store implementation that doesn't do anything. It can be used in testing or in situations when state management is not required but shall be disabled.

Constructor Summary

Constructors

Constructor	Description
NullStateStore()

Method Summary

Modifier and Type	Method	Description
<T> T	delete(String correlationId, String key)	Deletes a state from the store by its key.
<T> T	load(String correlationId, String key)	Loads state from the store using its key.
<T> List<StateValue<T>>	loadBulk(String correlationId, List<String> keys)	Loads an array of states from the store using their keys.
<T> T	save(String correlationId, String key, T value)	Saves state into the store.

Methods inherited from class java.lang.Object

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

Constructor Details

NullStateStore

public NullStateStore()

Method Details

load

public <T> T load(String correlationId,
 String key)

Loads state from the store using its key. If value is missing in the stored it returns null.

Specified by:

load in interface IStateStore

Type Parameters:

T -

Parameters:

correlationId - (optional) transaction id to trace execution through call chain.

key - a unique state key.

Returns:

the state value or null if value wasn't found.

loadBulk

public <T> List<StateValue<T>> loadBulk(String correlationId,
 List<String> keys)

Loads an array of states from the store using their keys.

Specified by:

loadBulk in interface IStateStore

Type Parameters:

T -

Parameters:

correlationId - (optional) transaction id to trace execution through call chain.

keys - unique state keys.

Returns:

an array with state values and their corresponding keys.

save

public <T> T save(String correlationId,
 String key,
 T value)

Saves state into the store.

Specified by:

save in interface IStateStore

Type Parameters:

T -

Parameters:

correlationId - (optional) transaction id to trace execution through call chain.

key - a unique state key.

value - a state value.

Returns:

The state that was stored in the store.

delete

public <T> T delete(String correlationId,
 String key)

Deletes a state from the store by its key.

Specified by:

delete in interface IStateStore

Type Parameters:

T -

Parameters:

correlationId - (optional) transaction id to trace execution through call chain.

key - a unique value key.

Returns:

deleted value