1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/**
*
* Copyright 2005 The Apache Software Foundation
*
* Licensed 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.tuscany.tomcat;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.valves.ValveBase;
import org.osoa.sca.CurrentModuleContext;
import org.osoa.sca.ModuleContext;
import org.osoa.sca.SCA;
import org.apache.tuscany.core.context.AggregateContext;
import org.apache.tuscany.core.context.EventContext;
import org.apache.tuscany.core.context.EventException;
import org.apache.tuscany.core.context.webapp.LazyHTTPSessionId;
/**
* Valve that can be added to a pipeline to automatically set the SCA environment as each request is processed.
*
* @version $Rev$ $Date$
*/
public class TuscanyValve extends ValveBase {
/**
* Name of the note that contains the request id
*/
private static final String REQUEST_ID = "org.apache.tuscany.tomcat.REQUEST_ID";
private static final ContextBinder BINDER = new ContextBinder();
private final AggregateContext moduleComponentContext;
public TuscanyValve(AggregateContext moduleComponentContext) {
this.moduleComponentContext = moduleComponentContext;
}
public void invoke(Request request, Response response) throws IOException, ServletException {
Object oldRequestId = request.getNote(REQUEST_ID);
ModuleContext oldContext = CurrentModuleContext.getContext();
// bind the current module context to the thread for use by CurrentModuleContext
BINDER.setContext((ModuleContext) moduleComponentContext);
try {
if (oldRequestId != null) {
// the request has already been started, just invoke the next valve
next.invoke(request, response);
} else {
// tell the runtime a new request is starting
Object requestId = new Object();
// jfm
if (request.getSession(false) != null) {
// A session is already active
moduleComponentContext
.fireEvent(EventContext.SESSION_NOTIFY, ((HttpServletRequest) request).getSession(true));
} else {
// Create a lazy wrapper since a session is not yet active
moduleComponentContext.fireEvent(EventContext.SESSION_NOTIFY, new LazyHTTPSessionId(
(HttpServletRequest) request));
}
// jfm
try {
moduleComponentContext.fireEvent(EventContext.REQUEST_START, requestId);
} catch (Exception e) {
throw new ServletException(e.getMessage(), e);
}
request.setNote(REQUEST_ID, requestId);
try {
// invoke the next valve in the pipeline
next.invoke(request, response);
} finally {
// notify the runtime the request is ending
request.removeNote(REQUEST_ID);
try {
moduleComponentContext.fireEvent(EventContext.REQUEST_END, requestId);
} catch (Exception e) {
// the application already did its work, log and ignore
// todo log this exception
}
}
}
} finally {
// restore the previous module context onto the thread
BINDER.setContext(oldContext);
}
}
private static class ContextBinder extends SCA {
public void setContext(ModuleContext context) {
setModuleContext(context);
}
public void start() {
throw new AssertionError();
}
public void stop() {
throw new AssertionError();
}
}
}
|