1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.catalina.core;
18
19 import java.io.IOException;
20
21 import javax.servlet.ServletException;
22
23 import org.apache.catalina.Host;
24 import org.apache.catalina.connector.Request;
25 import org.apache.catalina.connector.Response;
26 import org.apache.catalina.valves.ValveBase;
27
28 /**
29 * Valve that implements the default basic behavior for the
30 * <code>StandardEngine</code> container implementation.
31 * <p>
32 * <b>USAGE CONSTRAINT</b>: This implementation is likely to be useful only
33 * when processing HTTP requests.
34 *
35 * @author Craig R. McClanahan
36 */
37 final class StandardEngineValve extends ValveBase {
38
39 //------------------------------------------------------ Constructor
40 public StandardEngineValve() {
41 super(true);
42 }
43
44
45 // --------------------------------------------------------- Public Methods
46
47 /**
48 * Select the appropriate child Host to process this request,
49 * based on the requested server name. If no matching Host can
50 * be found, return an appropriate HTTP error.
51 *
52 * @param request Request to be processed
53 * @param response Response to be produced
54 *
55 * @exception IOException if an input/output error occurred
56 * @exception ServletException if a servlet error occurred
57 */
58 @Override
59 public final void invoke(Request request, Response response)
60 throws IOException, ServletException {
61
62 // Select the Host to be used for this Request
63 Host host = request.getHost();
64 if (host == null) {
65 // HTTP 0.9 or HTTP 1.0 request without a host when no default host
66 // is defined. This is handled by the CoyoteAdapter.
67 return;
68 }
69 if (request.isAsyncSupported()) {
70 request.setAsyncSupported(host.getPipeline().isAsyncSupported());
71 }
72
73 // Ask this Host to process this request
74 host.getPipeline().getFirst().invoke(request, response);
75 }
76 }
77