org.arch4j.baseservices
Class BaseServicesProvider

java.lang.Object
  |
  +--org.arch4j.baseservices.BaseServicesProvider

public class BaseServicesProvider

extends Object

This class is the main provider for base system services offered by an application server or other engine. The services are accessed via the static getProvider() method.

As an example of access to the base services:

InitialContext ic = BaseServicesProvider.getProvider().getInitialContext();

Version:

1.0

Author:

David Colwell

Field Summary

protected String	BASE_SERVICES_CLASS_PROPERTY The base service implementation class property name.
protected String	BASE_SERVICES_DOMAIN The base services property file name.

Constructor Summary

protected

BaseServicesProvider() Constructs an instance of this class and initializes the baseServices.

Method Summary

protected Object	createInstance(Class aClass) Create an instance from the Class.
BaseServices	getBaseServices() Returns a reference to the BaseServices implementation.
protected Class	getBaseServicesClass() Get the base services implementation class to use from the property setting.
static BaseServicesProvider	getProvider() Returns the singleton instance of this class.

Methods inherited from class java.lang.Object

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

Field Detail

BASE_SERVICES_DOMAIN

protected final String BASE_SERVICES_DOMAIN

The base services property file name.

See Also:

Constant Field Values

BASE_SERVICES_CLASS_PROPERTY

protected final String BASE_SERVICES_CLASS_PROPERTY

The base service implementation class property name.

See Also:

Constant Field Values

Constructor Detail

BaseServicesProvider

protected BaseServicesProvider()

Constructs an instance of this class and initializes the baseServices. This is made protected so the only way to access this class is through the getProvider method.

Method Detail

getProvider

public static BaseServicesProvider getProvider()

Returns the singleton instance of this class.

getBaseServices

public BaseServices getBaseServices()

Returns a reference to the BaseServices implementation.

getBaseServicesClass

protected Class getBaseServicesClass()

Get the base services implementation class to use from the property setting.

Throws:

EnvironmentalException - if unable to retrieve the classname property or associate a Class object with the classname.

createInstance

protected Object createInstance(Class aClass)

Create an instance from the Class.

Throws:

EnvironmentalException - if fails to create a new instance of the Class.