org.exoplatform.container

Class AbstractContainer

java.lang.Object

org.exoplatform.container.AbstractContainer

All Implemented Interfaces:

Serializable, Container, Disposable, Startable

Direct Known Subclasses:

AbstractInterceptor, ExoContainer

public abstract class AbstractContainer
extends Object
implements Container

This class is the root class of all the implementations of a Container. It implements by default all the methods by delegating the call the the successor.

Version:

$Id$

Author:

Nicolas Filotto

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Interceptor	delegate

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractContainer()
protected	AbstractContainer(Interceptor successor)

Method Summary

Modifier and Type	Method and Description
void	accept(ContainerVisitor visitor) Accepts a visitor that should visit the child containers, component adapters and component instances.
<T> T	createComponent(Class<T> clazz, InitParams params) Creates a component corresponding to the given Class with the given InitParams
void	dispose() Dispose this component.
<T> ComponentAdapter<T>	getComponentAdapter(Object componentKey, Class<T> bindType, boolean autoRegistration) Find a component adapter associated with the specified key.
<T> ComponentAdapter<T>	getComponentAdapterOfType(Class<T> componentType, boolean autoRegistration) Find a component adapter associated with the specified type.
Collection<ComponentAdapter<?>>	getComponentAdapters() Retrieve all the component adapters inside this container.
<T> List<ComponentAdapter<T>>	getComponentAdaptersOfType(Class<T> componentType) Retrieve all component adapters inside this container that are associated with the specified type.
<T> T	getComponentInstance(Object componentKey, Class<T> bindType, boolean autoRegistration) Retrieve a component instance registered with a specific key.
<T> T	getComponentInstanceOfType(Class<T> componentType, boolean autoRegistration) Find a component instance matching the specified type.
<T> List<T>	getComponentInstancesOfType(Class<T> componentType) Returns a List of components of a certain componentType.
ManagementContext	getManagementContext() Gives the corresponding ManagementContext
MBeanServer	getMBeanServer() Provides the MBeanServer this method is needed for backward compatibility
ObjectName	getScopingObjectName() Gives the ObjectName of the container build from the scoping data
Interceptor	getSuccessor() Retrieve the successor of this container in the chain of Interceptor.
void	initialize() Initializes the container
<T> ComponentAdapter<T>	registerComponentImplementation(Object componentKey, Class<T> componentImplementation) Register a component.
<T> ComponentAdapter<T>	registerComponentInstance(Object componentKey, T componentInstance) Register an arbitrary object as a component in the container.
void	start() Start this component.
void	stop() Stop this component.
ComponentAdapter<?>	unregisterComponent(Object componentKey) Unregister a component by key.

Methods inherited from class java.lang.Object

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

Field Detail

delegate

protected Interceptor delegate

Constructor Detail

AbstractContainer

protected AbstractContainer()

AbstractContainer

protected AbstractContainer(Interceptor successor)

Method Detail

start

public void start()

Start this component. Called initially at the begin of the lifecycle. It can be called again after a stop.

Specified by:

start in interface Startable

stop

public void stop()

Stop this component. Called near the end of the lifecycle. It can be called again after a further start. Implement Disposable if you need a single call at the definite end of the lifecycle.

Specified by:

stop in interface Startable

dispose

public void dispose()

Dispose this component. The component should deallocate all resources. The contract for this method defines a single call at the end of this component's life.

Specified by:

dispose in interface Disposable

getComponentInstance

public <T> T getComponentInstance(Object componentKey,
                                  Class<T> bindType,
                                  boolean autoRegistration)

Retrieve a component instance registered with a specific key. If a component cannot be found in this container, the parent container (if one exists) will be searched.

Specified by:

getComponentInstance in interface Container

Parameters:

componentKey - the key that the component was registered with.

bindType - the expected type of the instance if one can be found.

autoRegistration - indicates whether the auto registration should be performed or not

Returns:

an instantiated component, or null if no component has been registered for the specified key.

getComponentInstanceOfType

public <T> T getComponentInstanceOfType(Class<T> componentType,
                                        boolean autoRegistration)

Find a component instance matching the specified type.

Specified by:

getComponentInstanceOfType in interface Container

Parameters:

componentType - the type of the component.

autoRegistration - indicates whether the auto registration should be performed or not

Returns:

the adapter matching the class.

getSuccessor

public Interceptor getSuccessor()

Retrieve the successor of this container in the chain of Interceptor.

Specified by:

getSuccessor in interface Container

Returns:

a Interceptor instance, or null if this container does not have a successor.

getComponentAdapter

public <T> ComponentAdapter<T> getComponentAdapter(Object componentKey,
                                                   Class<T> bindType,
                                                   boolean autoRegistration)

Find a component adapter associated with the specified key. If a component adapter cannot be found in this container, the parent container (if one exists) will be searched.

Specified by:

getComponentAdapter in interface Container

Parameters:

componentKey - the key that the component was registered with.

bindType - the expected raw type of the adapter if one can be found.

autoRegistration - indicates whether the auto registration should be performed or not

Returns:

the component adapter associated with this key, or null if no component has been registered for the specified key.

getComponentAdapterOfType

public <T> ComponentAdapter<T> getComponentAdapterOfType(Class<T> componentType,
                                                         boolean autoRegistration)

Find a component adapter associated with the specified type. If a component adapter cannot be found in this container, the parent container (if one exists) will be searched.

Specified by:

getComponentAdapterOfType in interface Container

Parameters:

componentType - the type of the component.

autoRegistration - indicates whether the auto registration should be performed or not

Returns:

the component adapter associated with this class, or null if no component has been registered for the specified key.

getComponentAdapters

public Collection<ComponentAdapter<?>> getComponentAdapters()

Retrieve all the component adapters inside this container. The component adapters from the parent container are not returned.

Specified by:

getComponentAdapters in interface Container

Returns:

a collection containing all the ComponentAdapters inside this container. The collection will not be modifiable.

See Also:

a variant of this method which returns the component adapters inside this container that are associated with the specified type.

getComponentAdaptersOfType

public <T> List<ComponentAdapter<T>> getComponentAdaptersOfType(Class<T> componentType)

Retrieve all component adapters inside this container that are associated with the specified type. The component adapters from the parent container are not returned.

Specified by:

getComponentAdaptersOfType in interface Container

Parameters:

componentType - the type of the components.

Returns:

a collection containing all the ComponentAdapters inside this container that are associated with the specified type. Changes to this collection will not be reflected in the container itself.

getComponentInstancesOfType

public <T> List<T> getComponentInstancesOfType(Class<T> componentType)
                                        throws ContainerException

Returns a List of components of a certain componentType. The list is ordered by instantiation order, starting with the components instantiated first at the beginning.

Specified by:

getComponentInstancesOfType in interface Container

Parameters:

componentType - the searched type.

Returns:

a List of components.

Throws:

ContainerException

accept

public void accept(ContainerVisitor visitor)

Accepts a visitor that should visit the child containers, component adapters and component instances.

Specified by:

accept in interface Container

Parameters:

visitor - the visitor

registerComponentImplementation

public <T> ComponentAdapter<T> registerComponentImplementation(Object componentKey,
                                                               Class<T> componentImplementation)
                                                        throws ContainerException

Register a component.

Specified by:

registerComponentImplementation in interface Container

Parameters:

componentKey - a key that identifies the component. Must be unique within the container. The type of the key object has no semantic significance unless explicitly specified in the documentation of the implementing container.

componentImplementation - the component's implementation class. This must be a concrete class (ie, a class that can be instantiated).

Returns:

the ComponentAdapter that has been associated with this component. In the majority of cases, this return value can be safely ignored, as one of the getXXX() methods of the Container interface can be used to retrieve a reference to the component later on.

Throws:

ContainerException - if registration of the component fails.

registerComponentInstance

public <T> ComponentAdapter<T> registerComponentInstance(Object componentKey,
                                                         T componentInstance)
                                                  throws ContainerException

Register an arbitrary object as a component in the container. This is handy when other components in the same container have dependencies on this kind of object, but where letting the container manage and instantiate it is impossible.
Beware that too much use of this method is an antipattern.

Specified by:

registerComponentInstance in interface Container

Parameters:

componentKey - a key that identifies the component. Must be unique within the container. The type of the key object has no semantic significance unless explicitly specified in the implementing container.

componentInstance - an arbitrary object.

Returns:

the ComponentAdapter that has been associated with this component. In the majority of cases, this return value can be safely ignored, as one of the getXXX() methods of the Container interface can be used to retrieve a reference to the component later on.

Throws:

ContainerException - if registration fails.

unregisterComponent

public ComponentAdapter<?> unregisterComponent(Object componentKey)

Unregister a component by key.

Specified by:

unregisterComponent in interface Container

Parameters:

componentKey - key of the component to unregister.

Returns:

the ComponentAdapter that was associated with this component.

getManagementContext

public ManagementContext getManagementContext()

Gives the corresponding ManagementContext

Specified by:

getManagementContext in interface Container

getMBeanServer

public MBeanServer getMBeanServer()

Provides the MBeanServer this method is needed for backward compatibility

Specified by:

getMBeanServer in interface Container

getScopingObjectName

public ObjectName getScopingObjectName()

Gives the ObjectName of the container build from the scoping data

Specified by:

getScopingObjectName in interface Container

createComponent

public <T> T createComponent(Class<T> clazz,
                             InitParams params)
                      throws Exception

Creates a component corresponding to the given Class with the given InitParams

Specified by:

createComponent in interface Container

Parameters:

clazz - the Class of the object to create

params - the parameters to use to create the component

Returns:

an instance of the component

Throws:

Exception - if any issue occurs while creating the component.

initialize

public void initialize()

Initializes the container

Specified by:

initialize in interface Container