¿Qué es el adaptador de canal en Spring Integration?

What is Channel adapter in Spring Integration?

A channel adapter is a message endpoint that enables connecting a single sender or receiver to a message channel. Spring Integration provides a number of adapters to support various transports, such as JMS, file, HTTP, web services, mail, and more.

The Spring Integration Message is a generic container for data. Any object can be provided as the payload, and each Message instance includes headers containing user-extensible properties as key-value pairs.

The spring:message tag provides you with internationalization support using Spring’s MessageSource concept. If “code” isn’t set or cannot be resolved, “text” will be used as default message. Thus, this tag can also be used for HTML escaping of any texts.

The spring:message tag provides you with internationalization support using Spring’s MessageSource concept. The MessageSource is an interface providing functionality for retrieving messages. It closely resembles JSTL’s fmt:message -tag, however, the MessageSource classes can be integrated with the Spring context.

An inbound-channel-adapter element can invoke any method on a Spring-managed object and send a non-null return value to a MessageChannel after converting the method’s output to a Message . When the adapter’s subscription is activated, a poller tries to receive messages from the source.

The MessageChannel Interface Spring Integration’s top-level MessageChannel interface is defined as follows: public interface MessageChannel { boolean send(Message message) ; boolean send(Message message, long timeout) ; } When sending a message, the return value is true if the message is sent successfully.

An adapter receives messages from an external messaging system (JMS, e-mail, SFTP, whatever) and “adapts” it to the messaging system (as a Spring Integration Message ). The inbound email adapter takes messages sitting in a mail-box (IMAP, or whatever) and “adapts” it to the Spring Integration Message type.

The DirectChannel message channel used in this example is named using the setComponentName method. This is the name that will appear in the message history. Message history is enabled for the individual message channel by calling the setShouldTrack method with the parameter true. One single message is sent to the message channel.