/**
* 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.zookeeper.server;
/**
* RequestProcessors are chained together to process transactions. Requests are
* always processed in order. The standalone server, follower, and leader all
* have slightly different RequestProcessors chained together.
*
* Requests always move forward through the chain of RequestProcessors. Requests
* are passed to a RequestProcessor through processRequest(). Generally method
* will always be invoked by a single thread.
*
* When shutdown is called, the request RequestProcessor should also shutdown
* any RequestProcessors that it is connected to.
*/
public interface RequestProcessor {
@SuppressWarnings("serial")
public static class RequestProcessorException extends Exception {
public RequestProcessorException(String msg, Throwable t) {
super(msg, t);
}
}
void processRequest(Request request) throws RequestProcessorException;
void shutdown();
}