001/*
002 * ====================================================================
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *   http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing,
014 * software distributed under the License is distributed on an
015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
016 * KIND, either express or implied.  See the License for the
017 * specific language governing permissions and limitations
018 * under the License.
019 * ====================================================================
020 *
021 * This software consists of voluntary contributions made by many
022 * individuals on behalf of the Apache Software Foundation.  For more
023 * information on the Apache Software Foundation, please see
024 * <http://www.apache.org/>.
025 *
026 */
027
028package org.apache.http.protocol;
029
030import org.apache.http.HttpRequestInterceptor;
031import org.apache.http.HttpResponseInterceptor;
032
033/**
034 * HTTP protocol processor is a collection of protocol interceptors that
035 * implements the 'Chain of Responsibility' pattern, where each individual
036 * protocol interceptor is expected to work on a particular aspect of the HTTP
037 * protocol the interceptor is responsible for.
038 * <p>
039 * Usually the order in which interceptors are executed should not matter as
040 * long as they do not depend on a particular state of the execution context.
041 * If protocol interceptors have interdependencies and therefore must be
042 * executed in a particular order, they should be added to the protocol
043 * processor in the same sequence as their expected execution order.
044 * <p>
045 * Protocol interceptors must be implemented as thread-safe. Similarly to
046 * servlets, protocol interceptors should not use instance variables unless
047 * access to those variables is synchronized.
048 *
049 * @since 4.0
050 */
051public interface HttpProcessor
052    extends HttpRequestInterceptor, HttpResponseInterceptor {
053
054    // no additional methods
055}