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AbstractInterceptor (JBoss/JMX API) - JBoss 3.2.7 jmx API Documentation 英文版文档

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org.jboss.mx.interceptor
Class AbstractInterceptor

java.lang.Object
  org.jboss.mx.interceptor.AbstractInterceptor

All Implemented Interfaces:

Interceptor

Direct Known Subclasses:

AbstractSharedInterceptor, LogInterceptor, ModelMBeanAttributeInterceptor, ModelMBeanInfoInterceptor, NullInterceptor, ObjectReferenceInterceptor, PersistenceInterceptor, SecurityInterceptor, StandardMBeanInfoInterceptor

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public abstract class AbstractInterceptor

extends Object

implements Interceptor

Base class for all interceptors. This class provides some default method implementations for interceptors.

Version:

$Revision: 1.4.2.5 $

Author:

Juha Lindfors.

See Also:

Interceptor, MBeanInvoker

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Field Summary
protected  boolean	isShared           Indicates whether this interceptor instance is shared or not.
protected  org.jboss.logging.Logger	log           Logger reference for interceptor implementations.
protected  String	name           Name for this interceptor.

 

Constructor Summary

AbstractInterceptor()           Constructs a new intereceptor instance.

AbstractInterceptor(String name)           Constructs a new interceptor instance with a given name.

 

Method Summary
void	destroy()           This method is part of the interceptor lifecycle.
String	getName()           Returns the name of this interceptor.
void	init()           This method is part of the interceptor's lifecycle.
Object	invoke(Invocation invocation)           The default invoke implementation queries the invocation object for the next interceptor in the chain.
boolean	isShared()           Returns true if this interceptor is shared by multiple invokers; false otherwise.
void	setLogger(org.jboss.logging.Logger log)           Called by the MBeanInvoker on a non-shared interceptors to set a logger reference for this interceptor.
void	setName(String name)           Sets a name for this interceptor.
void	start()           This method is part of the interceptor's lifecycle.
void	stop()           This method is part of the interceptor lifecycle.
String	toString()           Returns a string representation of this interceptor instance.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

name

protected String name

Name for this interceptor.

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isShared

protected boolean isShared

Indicates whether this interceptor instance is shared or not.

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log

protected org.jboss.logging.Logger log

Logger reference for interceptor implementations. This reference is set by the invoker for non-shared interceptors after construction. Shared interceptors will should create their own logger instance.

Constructor Detail

AbstractInterceptor

public AbstractInterceptor()

Constructs a new intereceptor instance. This interceptor is not shared in the MBean server.

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AbstractInterceptor

public AbstractInterceptor(String name)

Constructs a new interceptor instance with a given name. This interceptor is not shared in the MBean server.

Parameters:

name - name of this interceptor

Throws:

IllegalArgumentException - if name contains null reference

Method Detail

setName

public void setName(String name)

Sets a name for this interceptor.

Parameters:

name -

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invoke

public Object invoke(Invocation invocation)
              throws InvocationException

The default invoke implementation queries the invocation object for the next interceptor in the chain. If one exists, it is invoked. Otherwise the invocation is dispatched to the target object.

Concrete implementations should override this method to implement their specific application logic.

Specified by:

invoke in interface Interceptor

Parameters:

invocation - the invocation object send towards the target resource by the invoker

Returns:

return value from the target resource

Throws:

InvocationException - This exception wraps any exceptions thrown by either the target method of the resource object, or invocation interceptors in this interceptor chain. The target exception is unwrapped at the MBeanInvoker instance.

See Also:

Invocation, MBeanInvoker

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getName

public String getName()

Description copied from interface: Interceptor

Returns the name of this interceptor. Notice that for shared interceptors this name must be unique among the shared interceptors in the MBean server.

Specified by:

getName in interface Interceptor

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isShared

public boolean isShared()

Description copied from interface: Interceptor

Returns true if this interceptor is shared by multiple invokers; false otherwise. Non-shared interceptors should always return false. Shared interceptors return false if they have not been registered to the MBean server yet. Shared interceptors must always return true after they have been registered to the server.

Specified by:

isShared in interface Interceptor

Returns:

true if shared;false otherwise

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setLogger

public void setLogger(org.jboss.logging.Logger log)

Description copied from interface: Interceptor

Called by the MBeanInvoker on a non-shared interceptors to set a logger reference for this interceptor. The interceptor implementation may use the invoker's logger for recording log information.

Shared interceptors should set up their log facility through other means as they are invoked by several different MBean invokers. To access the log implementation of the originating invoker for a particular invocation, an interceptor may query they invocation context for invoker reference.

Specified by:

setLogger in interface Interceptor

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init

public void init()
          throws Exception

Description copied from interface: Interceptor

This method is part of the interceptor's lifecycle. It is called by the invoker during the initialization of the interceptor instance.

For shared interceptors the lifecycle is driven by the MBean registration. This method is called before the MBean is registered to the server.

Concrete interceptor implementations can override this method to provide initialization code that should be executed before the interceptor is registered.

Any exception that is propagated from this method to its caller will cancel the interceptor registration.

Specified by:

init in interface Interceptor

Throws:

Exception - if you want to cancel the interceptor registration

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start

public void start()

Description copied from interface: Interceptor

This method is part of the interceptor's lifecycle. It is called by the invoker during the interceptor initialization process.

For shared interceptors the lifecycle is driven by the MBean registration. This method is called after the MBean is registered to the server as part of the MBeanRegistration.postRegister(java.lang.Boolean) execution.

Concrete interceptor implementations can override this method to provide initialization code that should be executed once the MBean server and object name references for this interceptor have been resolved.

Specified by:

start in interface Interceptor

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stop

public void stop()
          throws Exception

Description copied from interface: Interceptor

This method is part of the interceptor lifecycle. It is called by the invoker during the interceptor removal.

For shared interceptors the lifecycle is driven by the MBean unregistration. This method is called after the MBean is registered to the server as part of the MBeanRegistration.preDeregister() execution.

Concrete interceptor implementations can override this method to provide cleanup code that should be executed before the interceptor is unregistered.

Any exception that is propagated from this method to its caller will cancel the interceptor unregistration.

Specified by:

stop in interface Interceptor

Throws:

Exception - if you want to cancel the interceptor unregistration

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destroy

public void destroy()

Description copied from interface: Interceptor

This method is part of the interceptor lifecycle. It is called by the invoker durin the interceptor removal.

For shared interceptors the lifecycle is driven by the MBean unregistration. This method is called after the MBean is registered to the server as part of the MBeanRegistration.postDeregister() execution.

Concrete interceptor implementations can override this method to provide cleanup code that should be executed once the interceptor is no longer registered to the MBean server.

Specified by:

destroy in interface Interceptor

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toString

public String toString()

Returns a string representation of this interceptor instance.

Returns:

string representation

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