org.jboss.aop.joinpoint

Class MethodInvocation

java.lang.Object

org.jboss.aop.joinpoint.InvocationBase

org.jboss.aop.joinpoint.MethodInvocation

All Implemented Interfaces:

Externalizable, Serializable, Invocation

Direct Known Subclasses:

ContainerProxyMethodInvocation, MethodInvocationWrapper, ProxyMethodInvocation

public class MethodInvocation
extends InvocationBase
implements Externalizable

Version:

$Revision: 70849 $

Author:

Bill Burke

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected Method	advisedMethod
protected Object[]	arguments arguments of the method call expressed as an array of objects
protected MarshalledObject	marshalledArguments
protected long	methodHash
protected Method	unadvisedMethod

Fields inherited from class org.jboss.aop.joinpoint.InvocationBase

advisor, currentInterceptor, instanceResolver, interceptors, metadata, responseContextInfo, targetObject

Constructor Summary

Constructors

Modifier	Constructor and Description
	MethodInvocation()
protected	MethodInvocation(Interceptor[] interceptors)
	MethodInvocation(Interceptor[] interceptors, long methodHash, Method advisedMethod, Method unadvisedMethod, Advisor advisor)
	MethodInvocation(MethodInfo info, Interceptor[] interceptors)

Method Summary

Methods

Modifier and Type	Method and Description
Invocation	copy() Copies complete state of Invocation object.
Method	getActualMethod()
Advisor	getAdvisor()
Object[]	getArguments() Returns a non-null array containing all method arguments.
Object	getMetaData(Object group, Object attr) This method resolves metadata based on the context of the invocation.
Method	getMethod()
long	getMethodHash()
Invocation	getWrapper(Interceptor[] newchain) Returns a wrapper invocation object that can insert a new chain of interceptors at runtime to the invocation flow.
static Throwable	handleErrors(Object target, Method method, Object[] arguments, Throwable t) Handle invocation errors
Object	invokeNext() Invoke on the next interceptor in the chain.
Object	invokeTarget() Invokes the target joinpoint for this invocation skipping any subsequent interceptors in the chain.
void	readExternal(ObjectInput in)
Object	resolveAnnotation(Class<? extends Annotation> annotation) This method resolves an annotation based on the context of the invocation.
Object	resolveAnnotation(Class<? extends Annotation>[] annotations) This method resolves an annotation based on the context of the invocation.
<T extends Annotation> T	resolveTypedAnnotation(Class<T> annotation) Abstraction for resolving an annotation so that it can be overriden from the Method, Constructor, Field, etc.
<T extends Annotation> T	resolveTypedAnnotation(Class<T>[] annotations) Abstraction for resolving an annotation so that it can be overriden from the Method, Constructor, Field, etc.
void	setArguments(Object[] arguments) Replaces method argument values by the ones contained in arguments.
String	toString()
void	writeExternal(ObjectOutput out)

Methods inherited from class org.jboss.aop.joinpoint.InvocationBase

addResponseAttachment, getCurrentInterceptor, getInstanceResolver, getInterceptors, getMetaData, getResponseAttachment, getResponseContextInfo, getTargetObject, invokeNext, resolveClassAnnotation, resolveClassMetaData, resolveTypedClassAnnotation, setAdvisor, setInstanceResolver, setMetaData, setResponseContextInfo, setTargetObject

Methods inherited from class java.lang.Object

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

Field Detail

arguments

protected Object[] arguments

arguments of the method call expressed as an array of objects

methodHash

protected long methodHash

marshalledArguments

protected MarshalledObject marshalledArguments

advisedMethod

protected Method advisedMethod

unadvisedMethod

protected Method unadvisedMethod

Constructor Detail

MethodInvocation

public MethodInvocation(MethodInfo info,
                Interceptor[] interceptors)

MethodInvocation

public MethodInvocation(Interceptor[] interceptors,
                long methodHash,
                Method advisedMethod,
                Method unadvisedMethod,
                Advisor advisor)

MethodInvocation

protected MethodInvocation(Interceptor[] interceptors)

MethodInvocation

public MethodInvocation()

Method Detail

toString

public String toString()

Overrides:

toString in class Object

invokeNext

public Object invokeNext()
                  throws Throwable

Invoke on the next interceptor in the chain. If this is already the end of the chain, reflection will call the constructor, field, or method you are invoking on.

Specified by:

invokeNext in interface Invocation

Overrides:

invokeNext in class InvocationBase

Throws:

Throwable

invokeTarget

public Object invokeTarget()
                    throws Throwable

Invokes the target joinpoint for this invocation skipping any subsequent interceptors in the chain.

Specified by:

invokeTarget in interface Invocation

Overrides:

invokeTarget in class InvocationBase

Throws:

Throwable

handleErrors

public static Throwable handleErrors(Object target,
                     Method method,
                     Object[] arguments,
                     Throwable t)
                              throws Throwable

Handle invocation errors

Parameters:

target - the target

method - the method

arguments - the arguments

t - the error

Returns:

never

Throws:

Throwable - the throwable

resolveAnnotation

public Object resolveAnnotation(Class<? extends Annotation> annotation)

This method resolves an annotation based on the context of the invocation.

Specified by:

resolveAnnotation in interface Invocation

Overrides:

resolveAnnotation in class InvocationBase

Returns:

resolveTypedAnnotation

public <T extends Annotation> T resolveTypedAnnotation(Class<T> annotation)

Description copied from interface: Invocation

Abstraction for resolving an annotation so that it can be overriden from the Method, Constructor, Field, etc.

Specified by:

resolveTypedAnnotation in interface Invocation

Overrides:

resolveTypedAnnotation in class InvocationBase

Returns:

resolveAnnotation

public Object resolveAnnotation(Class<? extends Annotation>[] annotations)

This method resolves an annotation based on the context of the invocation.

Specified by:

resolveAnnotation in interface Invocation

Overrides:

resolveAnnotation in class InvocationBase

Returns:

resolveTypedAnnotation

public <T extends Annotation> T resolveTypedAnnotation(Class<T>[] annotations)

Description copied from interface: Invocation

Abstraction for resolving an annotation so that it can be overriden from the Method, Constructor, Field, etc.

Specified by:

resolveTypedAnnotation in interface Invocation

Overrides:

resolveTypedAnnotation in class InvocationBase

Returns:

getMetaData

public Object getMetaData(Object group,
                 Object attr)

This method resolves metadata based on the context of the invocation. It iterates through its list of MetaDataResolvers to find out the value of the metadata desired.

This list usually is ThreadMetaData, InstanceAdvisor.getMetaData ClassAdvisor.getMethodMetaData (or field, or constructor) ClassAdvisor.getDefaultMetaData

Specified by:

getMetaData in interface Invocation

Overrides:

getMetaData in class InvocationBase

getWrapper

public Invocation getWrapper(Interceptor[] newchain)

Returns a wrapper invocation object that can insert a new chain of interceptors at runtime to the invocation flow. CFlow makes use of this. When the wrapper object finishes its invocation chain it delegates back to the wrapped invocation.

Specified by:

getWrapper in interface Invocation

Parameters:

newchain - chain of interceptors to be inserted on invocation

Returns:

an invocation wrapper

copy

public Invocation copy()

Copies complete state of Invocation object.

Specified by:

copy in interface Invocation

Returns:

a copy of this instance

getArguments

public Object[] getArguments()

Returns a non-null array containing all method arguments.

The returned array can be changed by the advice or interceptor accordingly. All changes are reflected on joinpoint execution, and are noticed as well by other advices and interceptors that are executed after the current one.
However, changes to this array are limited to the scope of current advice execution, and must be performed before execution of invokeNext(), InvocationBase.invokeNext(Interceptor[]), or invokeTarget() method. Otherwise, inconsistency on joinpoint argument values may be noticed.

Returns:

the method arguments

setArguments

public void setArguments(Object[] arguments)

Replaces method argument values by the ones contained in arguments.

Advices and interceptors must be aware that, for performance reasons, this array does not get copied across; its reference is directly used instead. Hence, changes to arguments array after this method being called are forbidden. Otherwise, inconsistency on joinpoint argument values may be noticed.

Parameters:

arguments - a non-null array containing the new values of method arguments. The size of this array must be the same as the one of getArguments(), as well as the element types.

getMethod

public Method getMethod()

getActualMethod

public Method getActualMethod()

getMethodHash

public long getMethodHash()

getAdvisor

public Advisor getAdvisor()

Specified by:

getAdvisor in interface Invocation

Overrides:

getAdvisor in class InvocationBase

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException