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Java library for cluster communications and computing.

There is a newer version: 4.1.3

/*
 * Copyright 2020 The Hekate Project
 *
 * The Hekate Project 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 io.hekate.messaging.intercept;

import io.hekate.messaging.MessageMetaData;
import java.util.Optional;

/**
 * Server's receive context.
 *
 * @param  Message type.
 *
 * @see ServerMessageInterceptor#interceptServerReceive(ServerReceiveContext)
 */
public interface ServerReceiveContext extends ServerInboundContext {
    /**
     * Reads the message's meta-data.
     *
     * @return Message's meta-data.
     */
    Optional readMetaData();

    /**
     * Overrides the received message with the specified one.
     *
     * @param msg New message that should replace the received one.
     */
    void overrideMessage(T msg);

    /**
     * Sets an attribute of this context.
     *
     * 
     * Attributes are local to this context object and do not get transferred to a remote peer.
     * 
     *
     * @param name Name.
     * @param value Value.
     *
     * @return Previous value or {@code null} if attribute didn't have any value.
     *
     * @see #getAttribute(String)
     */
    Object setAttribute(String name, Object value);

}