Package org.springframework.messaging.handler.invocation

Class InvocableHandlerMethod

java.lang.Object

org.springframework.messaging.handler.HandlerMethod

org.springframework.messaging.handler.invocation.InvocableHandlerMethod

public class InvocableHandlerMethod
extends HandlerMethod

Extension of HandlerMethod that invokes the underlying method with argument values resolved from the current HTTP request through a list of HandlerMethodArgumentResolver.

Since:

4.0

Author:

Rossen Stoyanchev, Juergen Hoeller

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.messaging.handler.HandlerMethod

HandlerMethod.HandlerMethodParameter

Field Summary

Fields inherited from class org.springframework.messaging.handler.HandlerMethod

defaultLogger, logger

Constructor Summary

Constructors

Constructor	Description
InvocableHandlerMethod(Object bean, Method method)	Create an instance from a bean instance and a method.
InvocableHandlerMethod(Object bean, String methodName, Class<?>... parameterTypes)	Construct a new handler method with the given bean instance, method name and parameters.
InvocableHandlerMethod(HandlerMethod handlerMethod)	Create an instance from a HandlerMethod.

Method Summary

Modifier and Type	Method	Description
protected Object	doInvoke(Object... args)	Invoke the handler method with the given argument values.
protected Object[]	getMethodArgumentValues(Message<?> message, Object... providedArgs)	Get the method argument values for the current message, checking the provided argument values and falling back to the configured argument resolvers.
Object	invoke(Message<?> message, Object... providedArgs)	Invoke the method after resolving its argument values in the context of the given message.
void	setMessageMethodArgumentResolvers(HandlerMethodArgumentResolverComposite argumentResolvers)	Set HandlerMethodArgumentResolvers to use for resolving method argument values.
void	setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer)	Set the ParameterNameDiscoverer for resolving parameter names when needed (e.g.

Methods inherited from class org.springframework.messaging.handler.HandlerMethod

assertTargetBean, createWithResolvedBean, equals, findProvidedArgument, formatArgumentError, formatInvokeError, getBean, getBeanType, getBridgedMethod, getLogger, getMethod, getMethodAnnotation, getMethodParameters, getResolvedFromHandlerMethod, getReturnType, getReturnValueType, getShortLogMessage, hashCode, hasMethodAnnotation, isVoid, setLogger, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

InvocableHandlerMethod

public InvocableHandlerMethod(HandlerMethod handlerMethod)

Create an instance from a HandlerMethod.

InvocableHandlerMethod

public InvocableHandlerMethod(Object bean,
 Method method)

Create an instance from a bean instance and a method.

InvocableHandlerMethod

public InvocableHandlerMethod(Object bean,
 String methodName,
 Class<?>... parameterTypes)
                       throws NoSuchMethodException

Construct a new handler method with the given bean instance, method name and parameters.

Parameters:

bean - the object bean

methodName - the method name

parameterTypes - the method parameter types

Throws:

NoSuchMethodException - when the method cannot be found

Method Details

setMessageMethodArgumentResolvers

public void setMessageMethodArgumentResolvers(HandlerMethodArgumentResolverComposite argumentResolvers)

Set HandlerMethodArgumentResolvers to use for resolving method argument values.

setParameterNameDiscoverer

public void setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer)

Set the ParameterNameDiscoverer for resolving parameter names when needed (e.g. default request attribute name).

Default is a DefaultParameterNameDiscoverer.

invoke

@Nullable
public Object invoke(Message<?> message,
 Object... providedArgs)
              throws Exception

Invoke the method after resolving its argument values in the context of the given message.

Argument values are commonly resolved through HandlerMethodArgumentResolvers. The providedArgs parameter however may supply argument values to be used directly, i.e. without argument resolution.

Delegates to getMethodArgumentValues(org.springframework.messaging.Message<?>, java.lang.Object...) and calls doInvoke(java.lang.Object...) with the resolved arguments.

Parameters:

message - the current message being processed

providedArgs - "given" arguments matched by type, not resolved

Returns:

the raw value returned by the invoked method

Throws:

Exception - raised if no suitable argument resolver can be found, or if the method raised an exception

See Also:

• getMethodArgumentValues(org.springframework.messaging.Message<?>, java.lang.Object...)
• doInvoke(java.lang.Object...)

getMethodArgumentValues

protected Object[] getMethodArgumentValues(Message<?> message,
 Object... providedArgs)
                                    throws Exception

Get the method argument values for the current message, checking the provided argument values and falling back to the configured argument resolvers.

The resulting array will be passed into doInvoke(java.lang.Object...).

Throws:

Exception

Since:

5.1.2

doInvoke

@Nullable
protected Object doInvoke(Object... args)
                   throws Exception

Invoke the handler method with the given argument values.

Throws:

Exception