| /* |
| * 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.asyncweb.server.context; |
| |
| import org.apache.asyncweb.common.HttpResponse; |
| import org.apache.asyncweb.server.HttpServiceContext; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Defines common sensible behaviour for the rules under which a |
| * connection should be kept alive. |
| * <code>BasicKeepAliveStrategy</code> will signal that a connection |
| * should be closed iff: |
| * <ul> |
| * <li>The request is <i>committed</i></li> |
| * <li>The status of a response forces the connection to be closed</li> |
| * <li>The request does not want keep-alives</li> |
| * </ul> |
| * Implementations should override <code></code> to provide additional |
| * constraints |
| * |
| */ |
| public class BasicKeepAliveStrategy implements KeepAliveStrategy { |
| |
| private static final Logger LOG = LoggerFactory |
| .getLogger(BasicKeepAliveStrategy.class); |
| |
| /** |
| * Determines whether a connection should be kept alive based |
| * on a response. |
| * This method returns true iff either: |
| * <ul> |
| * <li>The request is not committed</li> |
| * </u> |
| * or (in order): |
| * <ul> |
| * <li>The status of a response does not force closure</li> |
| * <li>The request indicates that it wants the connection to remain |
| * open</li> |
| * <li><code>doIsKeepAlive</code> returns true</li> |
| * </ul> |
| * |
| * @param response The response to examine |
| * @return <code>true</code> iff a connection should be kept alive |
| */ |
| public final boolean keepAlive(HttpServiceContext context, |
| HttpResponse response) { |
| boolean isKeepAlive; |
| if (!context.isResponseCommitted()) { |
| isKeepAlive = true; |
| } else { |
| isKeepAlive = !response.getStatus().forcesConnectionClosure() |
| && context.getRequest().isKeepAlive() |
| && doIsKeepAlive(context, response); |
| if (!isKeepAlive && LOG.isDebugEnabled() |
| && response.getStatus().forcesConnectionClosure()) { |
| LOG.debug("Response status forces closure: " |
| + response.getStatus()); |
| } |
| } |
| return isKeepAlive; |
| } |
| |
| /** |
| * Simply returns <code>true</code> by default. |
| * Implementations should override this method to provide any |
| * additional keep-alive conditions |
| * |
| * @param context The context to check |
| * @param response The request to check |
| * @return <code>true</code> if the connection should |
| * be kept alive |
| */ |
| @SuppressWarnings("unused") |
| protected boolean doIsKeepAlive(HttpServiceContext context, |
| HttpResponse response) { |
| return true; |
| } |
| |
| } |