de.otto.synapse.endpoint

Interface MessageEndpoint

All Known Subinterfaces:

MessageLogReceiverEndpoint, MessageQueueReceiverEndpoint, MessageReceiverEndpoint, MessageSenderEndpoint

All Known Implementing Classes:

AbstractMessageEndpoint, AbstractMessageLogReceiverEndpoint, AbstractMessageReceiverEndpoint, AbstractMessageSenderEndpoint, DelegateMessageLogReceiverEndpoint, DelegateMessageQueueReceiverEndpoint, DelegateMessageSenderEndpoint

public interface 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

Method Summary

Modifier and Type	Method and Description
java.lang.String	getChannelName() Returns the name of the channel.
EndpointType	getEndpointType() Returns the type of the MessageEndpoint, either EndpointType.SENDER or EndpointType.RECEIVER.
InterceptorChain	getInterceptorChain() Returns the InterceptorChain of the MessageEndpoint.
TextMessage	intercept(TextMessage message) Intercepts a message using all registered interceptors and returns the resulting message.

Method Detail

getChannelName

@Nonnull
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.

Returns:

name of the channel

getInterceptorChain

@Nonnull
InterceptorChain getInterceptorChain()

Returns the InterceptorChain of the MessageEndpoint.

Returns:

InterceptorChain

getEndpointType

@Nonnull
EndpointType getEndpointType()

Returns the type of the MessageEndpoint, either EndpointType.SENDER or EndpointType.RECEIVER.

Returns:

EndpointType

intercept

@Nullable
TextMessage intercept(@Nonnull
                                TextMessage 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.

Parameters:

message - the message to intercept

Returns:

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