T - the target typepublic class AnnotatedMessageHandlingMember<T> extends Object implements MessageHandlingMember<T>
MessageHandlingMember that is used to invoke message handler methods on the target type.| Constructor and Description |
|---|
AnnotatedMessageHandlingMember(Executable executable,
Class<? extends Message> messageType,
Class<?> explicitPayloadType,
ParameterResolverFactory parameterResolverFactory)
Initializes a new instance that will invoke the given
executable (method) on a target to handle a message
of the given messageType. |
| Modifier and Type | Method and Description |
|---|---|
Optional<Map<String,Object>> |
annotationAttributes(Class<? extends Annotation> annotationType)
Get the attributes of an annotation of given
annotationType on the method of the target entity. |
boolean |
canHandle(Message<?> message)
Checks if this handler is capable of handling the given
message. |
Object |
handle(Message<?> message,
T target)
Handles the given
message by invoking the appropriate method on given target. |
boolean |
hasAnnotation(Class<? extends Annotation> annotationType)
Checks whether the method of the target entity contains the given
annotationType. |
protected boolean |
parametersMatch(Message<?> message)
Checks if the parameter resolvers of this member are compatible with the given
message. |
Class<?> |
payloadType()
Returns the payload type of messages that can be processed by this handler.
|
int |
priority()
Returns a number representing the priority of this handler over other handlers capable of processing the same
message.
|
String |
toString() |
protected boolean |
typeMatches(Message<?> message)
Checks if this member can handle the type of the given
message. |
<H> Optional<H> |
unwrap(Class<H> handlerType)
Returns the wrapped handler object if its type is an instance of the given
handlerType. |
public AnnotatedMessageHandlingMember(Executable executable, Class<? extends Message> messageType, Class<?> explicitPayloadType, ParameterResolverFactory parameterResolverFactory)
executable (method) on a target to handle a message
of the given messageType.executable - the method to invoke on a targetmessageType - the type of message that is expected by the target methodexplicitPayloadType - the expected message payload typeparameterResolverFactory - factory used to resolve method parameterspublic Class<?> payloadType()
MessageHandlingMemberpayloadType in interface MessageHandlingMember<T>public int priority()
MessageHandlingMemberIn general, a handler with a higher priority will receive the message before (or instead of) handlers with a lower priority. However, the priority value may not be the only indicator that is used to determine the order of invocation. For instance, a message processor may decide to ignore the priority value if one message handler is a more specific handler of the message than another handler.
priority in interface MessageHandlingMember<T>public boolean canHandle(Message<?> message)
MessageHandlingMembermessage.canHandle in interface MessageHandlingMember<T>message - The message that is to be handledtrue if the handler is capable of handling the message, false otherwiseprotected boolean typeMatches(Message<?> message)
message. This method does not check if the
parameter resolvers of this member are compatible with the given message. Use parametersMatch(Message)
for that.message - the message to check fortrue if this member can handle the message type. false otherwiseprotected boolean parametersMatch(Message<?> message)
message.message - the message to check fortrue if the parameter resolvers can handle this message. false otherwisepublic Object handle(Message<?> message, T target) throws Exception
MessageHandlingMembermessage by invoking the appropriate method on given target. This may result in
an exception if the given target is not capable of handling the message or if an exception is thrown during
invocation of the method.handle in interface MessageHandlingMember<T>message - The message to handletarget - The target to handle the messageException - when there was a problem that prevented invocation of the method or if an exception was thrown
from the invoked methodpublic Optional<Map<String,Object>> annotationAttributes(Class<? extends Annotation> annotationType)
MessageHandlingMemberannotationType on the method of the target entity. If the
annotation is present on the target method an Optional is returned containing the properties mapped by their
name. If the annotation is not present an empty Optional is returned.annotationAttributes in interface MessageHandlingMember<T>annotationType - The annotation to check for on the target methodpublic boolean hasAnnotation(Class<? extends Annotation> annotationType)
MessageHandlingMemberannotationType.hasAnnotation in interface MessageHandlingMember<T>annotationType - Annotation to check for on the target methodtrue if the annotation is present on the target method, false otherwisepublic <H> Optional<H> unwrap(Class<H> handlerType)
MessageHandlingMemberhandlerType. For instance, if
this method is invoked with Executable and the message is handled by a method of the
target entity, then this method will return the method handle as a Method.unwrap in interface MessageHandlingMember<T>H - The wrapped handler typehandlerType - The expected type of the wrapped handlerCopyright © 2010–2018. All rights reserved.