Package ej.service.loader

Class DependencyInjectionServiceLoader

java.lang.Object

ej.service.loader.SimpleServiceLoader

ej.service.loader.DependencyInjectionServiceLoader

All Implemented Interfaces:

ServiceLoader

Direct Known Subclasses:

FilePropertiesServiceLoader, MetaInfServiceLoader, SystemPropertiesServiceLoader

public abstract class DependencyInjectionServiceLoader
extends SimpleServiceLoader

Service loader implementation that creates service instance from a declared implementation class name.

Subclasses need to provide the implementation class name matching the requested services. The implementation is then instantiated using Class.forName(String) and Class.newInstance(). The singletons are stored in a map.

Field Summary

Fields inherited from class ej.service.loader.SimpleServiceLoader

services

Constructor Summary

Constructors

Constructor	Description
DependencyInjectionServiceLoader()

Method Summary

Modifier and Type	Method	Description
protected <T> T	createAlternativeImplementation(Class<T> service)	Creates an implementation for the given service and save it in the cache.
protected abstract String	getImplementationName(String serviceName)	Gets the implementation class name for the given service name.

Methods inherited from class ej.service.loader.SimpleServiceLoader

checkServicePermission, getService, putService

Methods inherited from class java.lang.Object

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

Constructor Detail

DependencyInjectionServiceLoader

public DependencyInjectionServiceLoader()

Method Detail

createAlternativeImplementation

@Nullable
protected <T> T createAlternativeImplementation(Class<T> service)

Description copied from class: SimpleServiceLoader

Creates an implementation for the given service and save it in the cache.

Overrides:

createAlternativeImplementation in class SimpleServiceLoader

Type Parameters:

T - the service type.

Parameters:

service - the service.

Returns:

a new instance of the given service or null.

getImplementationName

@Nullable
protected abstract String getImplementationName(String serviceName)

Gets the implementation class name for the given service name.

Parameters:

serviceName - the service name.

Returns:

the implementation class name, or null if none.