de.otto.synapse.endpoint

Interface MessageInterceptor

All Known Implementing Classes:

InterceptorChain, MessageFilter

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface MessageInterceptor

Message interceptors are used to intercept messages before they are sent or received by message endpoints.

MessageInterceptors will usually be chained using a InterceptorChain.

A MessageInterceptor can be used in different ways like, for example:

• Logging
• Calculating Metrics
• Wire Taps
• Message Filters

...and many other.

See Also:

EIP: Message Filter, EIP: Wire Taps

Method Summary

Modifier and Type	Method and Description
Message<java.lang.String>	intercept(Message<java.lang.String> message) Intercept a message and return the same message, a modified version of the incoming message, or null, if the message should be filtered out and dropped by the AbstractMessageEndpoint

Method Detail

intercept

@Nullable
Message<java.lang.String> intercept(@Nonnull
                                               Message<java.lang.String> message)

Intercept a message and return the same message, a modified version of the incoming message, or null, if the message should be filtered out and dropped by the AbstractMessageEndpoint

Parameters:

message - the channel-layer message with payload-type beeing a String

Returns:

intercepted version of the message, or null if the message should be dropped.