io.helixservice.core.component

Interface ComponentRegistry

All Known Subinterfaces:

Feature, Server

All Known Implementing Classes:

AbstractFeature, BlockingWorkerFeature, HelixServer, VertxNativeFeature

public interface ComponentRegistry

Registry for Helix Components

Method Summary

Modifier and Type	Method and Description
<T extends Component> Collection<T>	findByType(String componentType) Find a list of components by type name
<T extends Component> T	findByType(String componentType, T defaultValue) Finds the a registered component by type name.
com.google.common.collect.Multimap<String,Component>	getRegistrationMap() Returns the full map of registered components by type name.

Method Detail

getRegistrationMap

com.google.common.collect.Multimap<String,Component> getRegistrationMap()

Returns the full map of registered components by type name.
Do not modify the map, it is only for finding components.

Returns:

The registered components map.

findByType

<T extends Component> Collection<T> findByType(String componentType)

Find a list of components by type name

Type Parameters:

T - Resulting class of the components expected

Parameters:

componentType - Type name of the components to find

Returns:

A collection of the components found, or empty list of none is found.

findByType

<T extends Component> T findByType(String componentType,
                                   T defaultValue)

Finds the a registered component by type name. This method guarantees that the last (most recently) registered component will be returned.

Type Parameters:

T - Resulting class of the component expected

Parameters:

componentType - Type name of the component to find

defaultValue - Default component if none is found (null is okay)

Returns:

The found component, or the default component if no component was found.