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Client library for working with the NATS messaging system.

There is a newer version: 2.2.3

// Copyright 2015-2018 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package io.nats.streaming;

/**
 * A callback interface for handling NATS Streaming message acknowledgements.
 */
public interface AckHandler {
    /**
     * This method is called when a message has been acknowledged by the STAN
     * server, or if an error has occurred during the publish operations. Processes
     * the message acknowledgement ( {@code NUID} ), along with any error that was
     * encountered
     * 
     * @param nuid the message NUID
     * @param ex   any exception that was encountered
     */
    void onAck(String nuid, Exception ex);
}