Package org.apache.phoenix.util

Class InstanceResolver

java.lang.Object

org.apache.phoenix.util.InstanceResolver

public class InstanceResolver
extends Object

Resolves object instances registered using the JDK 6+ ServiceLoader.

Since:

2.0

Method Summary

Modifier and Type	Method	Description
static void	clearSingletons()
static <T> List	get(Class<T> clazz, List<T> defaultInstances)	Resolves all instances of a specified class and add it to the list of default implementations
static <T> T	getSingleton(Class<T> clazz, T defaultInstance)	Resolves an instance of the specified class if it has not already been resolved.

Methods inherited from class java.lang.Object

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

Method Details

getSingleton

public static <T> T getSingleton(Class<T> clazz,
 T defaultInstance)

Resolves an instance of the specified class if it has not already been resolved.

Parameters:

clazz - The type of instance to resolve

defaultInstance - The instance to use if a custom instance has not been registered

Returns:

The resolved instance or the default instance provided. null if an instance is not registered and a default is not provided.

get

public static <T> List get(Class<T> clazz,
 List<T> defaultInstances)

Resolves all instances of a specified class and add it to the list of default implementations

Type Parameters:

T - Type of class passed

Parameters:

clazz - Type of the instance to resolve

defaultInstances - List of instances that match the type clazz

Returns:

List of instance of the specified class. Newly found instances will be added to the existing contents of defaultInstances

clearSingletons

public static void clearSingletons()