de.otto.synapse.endpoint

Class MessageFilter

java.lang.Object

de.otto.synapse.endpoint.MessageFilter

All Implemented Interfaces:

MessageInterceptor

public class MessageFilter
extends java.lang.Object
implements MessageInterceptor

A MessageInterceptor that is used to filter messages using some predicate.

MessageFilter will usually be chained using a InterceptorChain.

See Also:

EIP: Message Filter

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 MessageEndpoint
static MessageFilter	messageFilter(java.util.function.Predicate<Message<java.lang.String>> predicate) Creates a MessageFilter that is used to filter messages from message endpoints.

Methods inherited from class java.lang.Object

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

Method Detail

messageFilter

public static MessageFilter messageFilter(java.util.function.Predicate<Message<java.lang.String>> predicate)

Creates a MessageFilter that is used to filter messages from message endpoints.

Messages will be dropped, if predicate.test(message) is false

Parameters:

predicate - the predicate used to select messages

Returns:

MessageFilter

intercept

@Nullable
public final 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 MessageEndpoint The intercept method of a MessageFilter returns the intercepted message, if the filter predicate returns true. Otherwise, null is returned and the message will be dropped.

Specified by:

intercept in interface MessageInterceptor

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.