/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.qpid.proton.engine;


/**
 * Sender
 *
 */

public interface Sender extends Link
{

    /**
     * indicates pending deliveries
     *
     * @param credits the number of pending deliveries
     * @todo is this absolute or cumulative?
     */
    public void offer(int credits);

    /**
     * Sends message data for the current delivery.
     *
     * @param bytes the message data
     */
    public int send(byte[] bytes, int offset, int length);


    /**
     * Abort the current delivery.
     *
     * Note "pn_link_abort" is commented out in the .h
     */
    public void abort();

    public void drained();
}