org.openbravo.base.provider

Class OBProvider

java.lang.Object

org.openbravo.base.provider.OBProvider

public class OBProvider
extends Object

The OBProvider provides the runtime instances of model entities as well as service instances. Classes are registered by their class type and it is identified if the class should be considered to be a singleton or not.

The OBProvider is an implementation of the servicelocator pattern discussed in Martin Fowler's article here: http://martinfowler.com/articles/injection.html

Author:

mtaal

Field Summary

Fields

Modifier and Type	Field and Description
static String	CONFIG_FILE_NAME

Constructor Summary

Constructors

Constructor and Description
OBProvider()

Method Summary

Methods

Modifier and Type	Method and Description
<T> T	get(Class<T> clz) Checks the registry for which class should be used for the passed clz.
Object	get(String name) Returns an instance of the requested service.
static OBProvider	getInstance()
boolean	isRegistered(Class<?> clz) Returns true if the clz is registered.
boolean	isRegistered(String name) Checks if a service is registered under the name passed as a parameter.
void	register(Class<?> registrationClass, Class<?> instanceClass, boolean overwrite) Register an instance for an internal Openbravo class (the registrationClass).
void	register(String name, Class<?> instanceClass, boolean overwrite) Register an instance for an internal Openbravo class or service (the name).
protected void	register(String prefix, InputStream is)
protected void	register(String prefix, String configFile)
void	registerInstance(Class<?> registrationClass, Object instanceObj, boolean overwrite) Register an actual instance for an internal Openbravo class (the registrationClass).
void	removeInstance(Class<?> clz) Removes the singleton instance of the clz (if any) from the internal registry.
static void	setInstance(OBProvider instance)

Methods inherited from class java.lang.Object

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

Field Detail

CONFIG_FILE_NAME

public static final String CONFIG_FILE_NAME

See Also:

Constant Field Values

Constructor Detail

OBProvider

public OBProvider()

Method Detail

getInstance

public static OBProvider getInstance()

setInstance

public static void setInstance(OBProvider instance)

isRegistered

public boolean isRegistered(Class<?> clz)

Returns true if the clz is registered.

Parameters:

clz - the name of this class is used to check if it is already registered

Returns:

true if the clz is registered

isRegistered

public boolean isRegistered(String name)

Checks if a service is registered under the name passed as a parameter.

Parameters:

name - is used to search the registry

Returns:

true if a registration exists

register

protected void register(String prefix,
            InputStream is)

register

protected void register(String prefix,
            String configFile)

registerInstance

public void registerInstance(Class<?> registrationClass,
                    Object instanceObj,
                    boolean overwrite)

Register an actual instance for an internal Openbravo class (the registrationClass).

Parameters:

registrationClass - the original Openbravo class

instanceObj - the instance to use when the class is requested.

overwrite - true overwrite a current registration, false a current registration is not overwritten

register

public void register(Class<?> registrationClass,
            Class<?> instanceClass,
            boolean overwrite)

Register an instance for an internal Openbravo class (the registrationClass).

Parameters:

registrationClass - the original Openbravo class

instanceClass - the implementation class

overwrite - true overwrite a current registration, false a current registration is not overwritten

register

public void register(String name,
            Class<?> instanceClass,
            boolean overwrite)

Register an instance for an internal Openbravo class or service (the name).

Parameters:

name - the name of the Openbravo class or service

instanceClass - the implementation class

overwrite - true overwrite a current registration, false a current registration is not overwritten

get

public <T> T get(Class<T> clz)

Checks the registry for which class should be used for the passed clz. If no registration is found a new registration is created using the passed clz.

Parameters:

clz - the class for which an instance is requested

Returns:

an instance of the clz

removeInstance

public void removeInstance(Class<?> clz)

Removes the singleton instance of the clz (if any) from the internal registry. It will be recreated at next request.

Parameters:

clz - the instance of this class is removed.

get

public Object get(String name)

Returns an instance of the requested service. If no registration is found an OBProviderException is thrown

Parameters:

name - the name of the service

Returns:

an instance of the service

Throws:

OBProviderException