1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.myfaces.orchestra.lib.jsf;
20
21 import java.util.Map;
22
23 import javax.faces.FacesException;
24 import javax.faces.context.ExternalContext;
25 import javax.faces.context.FacesContext;
26
27 import org.apache.myfaces.orchestra.CoreConfig;
28 import org.apache.myfaces.orchestra.conversation.ConversationContext;
29 import org.apache.myfaces.orchestra.conversation.ConversationManager;
30
31 /**
32 * RequestHandler that ensures that only one thread is processing
33 * each ConversationContext at a time.
34 *
35 * @since 1.1
36 */
37 class ContextLockRequestHandler implements RequestHandler
38 {
39 ConversationContext context;
40
41 public void init(FacesContext facesContext) throws FacesException
42 {
43 if (getSerializeRequests(facesContext))
44 {
45 // Note that ConversationManager.getInstance requires the FrameworkAdapter
46 // to be initialised...
47 //
48 // ?? Why is false passed here ??
49 ConversationManager manager = ConversationManager.getInstance(false);
50 if (manager != null)
51 {
52 context = manager.getCurrentConversationContext();
53 if (context != null)
54 {
55 try
56 {
57 context.lockInterruptablyForCurrentThread();
58 }
59 catch(InterruptedException e)
60 {
61 throw new FacesException(e);
62 }
63 }
64 }
65 }
66 }
67
68 public void deinit() throws FacesException
69 {
70 if (context != null)
71 {
72 context.unlockForCurrentThread();
73 }
74 }
75
76 private boolean getSerializeRequests(FacesContext facesContext)
77 {
78 ExternalContext ec = facesContext.getExternalContext();
79
80 // Check for deprecated setting via the OrchestraServletFilter.
81 Map reqScope = ec.getRequestMap();
82 Boolean serializeRequests = (Boolean) reqScope.get(CoreConfig.SERIALIZE_REQUESTS);
83 if (serializeRequests != null)
84 {
85 return serializeRequests.booleanValue();
86 }
87
88 // Check for the normal global init param; true unless "false" is specified
89 String value = ec.getInitParameter(CoreConfig.SERIALIZE_REQUESTS);
90 return !"false".equals(value); // NON-NLS
91 }
92 }
93