de.otto.synapse.endpoint

Class AbstractMessageEndpoint

java.lang.Object

de.otto.synapse.endpoint.AbstractMessageEndpoint

All Implemented Interfaces:

MessageEndpoint

Direct Known Subclasses:

AbstractMessageReceiverEndpoint, AbstractMessageSenderEndpoint

public abstract class AbstractMessageEndpoint
extends java.lang.Object
implements MessageEndpoint

Endpoint that is used by an application to access the messaging infrastructure to send or receive messages.

The MessageEndpoint class is intended to derive message sender, message receiver or message-log receiver endpoints.

Message Endpoint code is custom to both the application and the messaging system’s client API. The rest of the application knows little about message formats, messaging channels, or any of the other details of communicating with other applications via messaging. It just knows that it has a request or piece of data to send to another application, or is expecting those from another application.

It is the messaging endpoint code that takes that command or data, makes it into a message, and sends it on a particular messaging channel. It is the endpoint that receives a message, extracts the contents, and gives them to the application in a meaningful way.

See Also:

EIP: Message Endpoint

Constructor Summary

Constructors

Constructor and Description
AbstractMessageEndpoint(java.lang.String channelName, MessageInterceptorRegistry interceptorRegistry) Constructor used to create a new AbstractMessageEndpoint.

Method Summary

Modifier and Type	Method and Description
java.lang.String	getChannelName() Returns the name of the channel.
InterceptorChain	getInterceptorChain() Returns the InterceptorChain of the MessageEndpoint.
Message<java.lang.String>	intercept(Message<java.lang.String> message) Intercepts a message using all registered interceptors and returns the resulting message.

Methods inherited from class java.lang.Object

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

Methods inherited from interface de.otto.synapse.endpoint.MessageEndpoint

getEndpointType

Constructor Detail

AbstractMessageEndpoint

public AbstractMessageEndpoint(@Nonnull
                               java.lang.String channelName,
                               @Nonnull
                               MessageInterceptorRegistry interceptorRegistry)

Constructor used to create a new AbstractMessageEndpoint.

Parameters:

channelName - the name of the underlying channel / stream / queue / message log.

interceptorRegistry - registry used to determine message interceptors for this endpoint.

Method Detail

getChannelName

@Nonnull
public final java.lang.String getChannelName()

Returns the name of the channel.

The channel name corresponds to the name of the underlying stream, queue or message log.

Specified by:

getChannelName in interface MessageEndpoint

Returns:

name of the channel

getInterceptorChain

@Nonnull
public final InterceptorChain getInterceptorChain()

Returns the InterceptorChain of the MessageEndpoint.

Specified by:

getInterceptorChain in interface MessageEndpoint

Returns:

InterceptorChain

intercept

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

Intercepts a message using all registered interceptors and returns the resulting message.

The interceptors are called in order. The result of one interceptor is propagated to the next interceptor in the chain, until the end of the chain is reached, or one interceptor has returned null.

If null is returned, the message must be dropped by the AbstractMessageEndpoint.

Every interceptor may transform the message, or may take additional actions like, for example, logging, monitoring or other things.

Specified by:

intercept in interface MessageEndpoint

Parameters:

message - the message to intercept

Returns:

the (possibly modified) message, or null if the message should be dropped.