/*
 * 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.catalina.comet;

import java.io.IOException;

import javax.servlet.ServletException;

/**
 * A CometFilterChain is an object provided by the servlet container to the developer
 * giving a view into the invocation chain of a filtered event for a resource. Filters
 * use the CometFilterChain to invoke the next filter in the chain, or if the calling filter
 * is the last filter in the chain, to invoke the resource at the end of the chain.
 *
 * @author Remy Maucherat
 */
public interface CometFilterChain {


    /**
     * Causes the next filter in the chain to be invoked, or if the calling filter is the last filter
     * in the chain, causes the resource at the end of the chain to be invoked.
     *
     * @param event the event to pass along the chain.
     */
    public void doFilterEvent(CometEvent event) throws IOException, ServletException;


}