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/*
 * 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;

import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;


/**
 * Intended for use by a {@link Valve} to indicate that the {@link Valve}
 * provides access logging. It is used by the Tomcat internals to identify a
 * Valve that logs access requests so requests that are rejected
 * earlier in the processing chain can still be added to the access log.
 * Implementations of this interface should be robust against the provided
 * {@link Request} and {@link Response} objects being null, having null
 * attributes or any other 'oddness' that may result from attempting to log
 * a request that was almost certainly rejected because it was mal-formed.
 */
public interface AccessLog {

    /**
     * Name of request attribute used to override the remote address recorded by
     * the AccessLog.
     */
    String REMOTE_ADDR_ATTRIBUTE =
            "org.apache.catalina.AccessLog.RemoteAddr";

    /**
     * Name of request attribute used to override remote host name recorded by
     * the AccessLog.
     */
    String REMOTE_HOST_ATTRIBUTE =
            "org.apache.catalina.AccessLog.RemoteHost";

    /**
     * Name of request attribute used to override the protocol recorded by the
     * AccessLog.
     */
    String PROTOCOL_ATTRIBUTE =
            "org.apache.catalina.AccessLog.Protocol";

    /**
     * Name of request attribute used to override the server name recorded by
     * the AccessLog.
     */
    String SERVER_NAME_ATTRIBUTE =
            "org.apache.catalina.AccessLog.ServerName";

    /**
     * Name of request attribute used to override the server port recorded by
     * the AccessLog.
     */
    String SERVER_PORT_ATTRIBUTE =
            "org.apache.catalina.AccessLog.ServerPort";


    /**
     * Add the request/response to the access log using the specified processing
     * time.
     *
     * @param request   Request (associated with the response) to log
     * @param response  Response (associated with the request) to log
     * @param time      Time taken to process the request/response in
     *                  nanoseconds (use 0 if not known); in Tomcat
     *                  versions prior to 10, the time unit was
     *                  milliseconds
     */
    void log(Request request, Response response, long time);

    /**
     * Should this valve use request attributes for IP address, hostname,
     * protocol and port used for the request?
     *
     * The attributes used are:
     * 
     * org.apache.catalina.RemoteAddr
     * org.apache.catalina.RemoteHost
     * org.apache.catalina.Protocol
     * org.apache.catalina.ServerName
     * org.apache.catalina.ServerPost
     * 
     *
     * @param requestAttributesEnabled  true causes the attributes
     *                                  to be used, false causes
     *                                  the original values to be used.
     */
    void setRequestAttributesEnabled(boolean requestAttributesEnabled);

    /**
     * @see #setRequestAttributesEnabled(boolean)
     * @return true if the attributes will be logged, otherwise
     *         false
     */
    boolean getRequestAttributesEnabled();
}