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A library used at otto.de to implement Spring Boot based event-sourcing microservices.

There is a newer version: 0.33.1

package de.otto.synapse.endpoint.sender;

import de.otto.synapse.message.Message;
import jakarta.annotation.Nonnull;

import java.util.concurrent.CompletableFuture;
import java.util.stream.Stream;

/**
 * Endpoint that is used by an application to send messages to a messaging channel.
 *
 * 
 *     
 * 
 *
 * @see EIP: Message Endpoint
 */

public interface MessageSender {

    /**
     * Send a single {@link Message} to the channel.
     *
     * @param message the message
     * @return a CompletableFuture that can be used for logging, error handling, waiting for completion, etc.
     */
    CompletableFuture send(@Nonnull Message message);

    /**
     * Send a batch of {@link Message messages} to the channel.
     *
     * @param batch the batch of messages
     * @return a CompletableFuture that can be used for logging, error handling, waiting for completion, etc.
     */
    CompletableFuture sendBatch(@Nonnull Stream> batch);

}