/*
* 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.nifi.cluster.protocol;
import org.apache.nifi.cluster.protocol.message.ProtocolMessage;
/**
* A handler for processing protocol messages.
*
*/
public interface ProtocolHandler {
/**
* Handles the given protocol message or throws an exception if it cannot
* handle the message. If no response is needed by the protocol, then null
* should be returned.
*
* @param msg a message
* @return a response or null, if no response is necessary
*
* @throws ProtocolException if the message could not be processed
*/
ProtocolMessage handle(ProtocolMessage msg) throws ProtocolException;
/**
* @param msg a message
* @return true if the handler can process the given message; false
* otherwise
*/
boolean canHandle(ProtocolMessage msg);
}