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

Provides a method for invoking the handler method for a given message after resolving its method argument values through registered HandlerMethodArgumentResolvers.

Use setMessageMethodArgumentResolvers(org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolverComposite) to customize the list of argument resolvers.

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

Method Summary

Modifier and Type	Method and Description
protected java.lang.Object	doInvoke(java.lang.Object... args) Invoke the handler method with the given argument values.
protected java.lang.String	getDetailedErrorMessage(java.lang.String text) Adds HandlerMethod details such as the bean type and method signature to the message.
java.lang.Object	invoke(Message<?> message, java.lang.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 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

createWithResolvedBean, equals, 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 Detail

InvocableHandlerMethod

public InvocableHandlerMethod(HandlerMethod handlerMethod)

Create an instance from a HandlerMethod.

InvocableHandlerMethod

public InvocableHandlerMethod(java.lang.Object bean,
                              java.lang.reflect.Method method)

Create an instance from a bean instance and a method.

InvocableHandlerMethod

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

java.lang.NoSuchMethodException - when the method cannot be found

Method Detail

setMessageMethodArgumentResolvers

public void setMessageMethodArgumentResolvers(HandlerMethodArgumentResolverComposite argumentResolvers)

Set HandlerMethodArgumentResolvers to use 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 java.lang.Object invoke(Message<?> message,
                                         java.lang.Object... providedArgs)
                                  throws java.lang.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.

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:

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

doInvoke

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

Invoke the handler method with the given argument values.

Throws:

java.lang.Exception

getDetailedErrorMessage

protected java.lang.String getDetailedErrorMessage(java.lang.String text)

Adds HandlerMethod details such as the bean type and method signature to the message.

Parameters:

text - error message to append the HandlerMethod details to