Source Code Cross Referenced for AppModule.java in  » Web-Framework » Tapestry » org » apache » tapestry » tutorial » services » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » Tapestry » org.apache.tapestry.tutorial.services 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // Copyright 2007 The Apache Software Foundation
02:        //
03:        // Licensed under the Apache License, Version 2.0 (the "License");
04:        // you may not use this file except in compliance with the License.
05:        // You may obtain a copy of the License at
06:        //
07:        //     http://www.apache.org/licenses/LICENSE-2.0
08:        //
09:        // Unless required by applicable law or agreed to in writing, software
10:        // distributed under the License is distributed on an "AS IS" BASIS,
11:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12:        // See the License for the specific language governing permissions and
13:        // limitations under the License.
14:
15:        package org.apache.tapestry.tutorial.services;
16:
17:        import java.io.IOException;
18:
19:        import org.apache.commons.logging.Log;
20:        import org.apache.tapestry.ioc.MappedConfiguration;
21:        import org.apache.tapestry.ioc.OrderedConfiguration;
22:        import org.apache.tapestry.ioc.annotations.InjectService;
23:        import org.apache.tapestry.services.Request;
24:        import org.apache.tapestry.services.RequestFilter;
25:        import org.apache.tapestry.services.RequestHandler;
26:        import org.apache.tapestry.services.Response;
27:
28:        /**
29:         * This module is automatically included as part of the Tapestry IoC Registry, it's a good place to
30:         * configure and extend Tapestry, or to place your own services.
31:         */
32:        public class AppModule {
33:            public static void contributeApplicationDefaults(
34:                    MappedConfiguration<String, String> configuration) {
35:                // Contributions to ApplicationDefaults will override any contributions to
36:                // FactoryDefaults (with the same key). Here we're restricting the supported
37:                // locales to just "en" (English). As you add localised message catalogs and other assets,
38:                // you can extend this list of locales (it's a comma seperated series of locale names;
39:                // the first locale name is the default when there's no reasonable match).
40:
41:                configuration.add("tapestry.supported-locales", "en");
42:            }
43:
44:            /**
45:             * This is a service definition, the service will be named TimingFilter. The interface,
46:             * RequestFilter, is used within the RequestHandler service pipeline, which is built from the
47:             * RequestHandler service configuration. Tapestry IoC is responsible for passing in an
48:             * appropriate Log instance. Requests for static resources are handled at a higher level, so
49:             * this filter will only be invoked for Tapestry related requests.
50:             */
51:            public RequestFilter buildTimingFilter(final Log log) {
52:                return new RequestFilter() {
53:                    public boolean service(Request request, Response response,
54:                            RequestHandler handler) throws IOException {
55:                        long startTime = System.currentTimeMillis();
56:
57:                        try {
58:                            // The reponsibility of a filter is to invoke the corresponding method
59:                            // in the handler. When you chain multiple filters together, each filter
60:                            // received a handler that is a bridge to the next filter.
61:
62:                            return handler.service(request, response);
63:                        } finally {
64:                            long elapsed = System.currentTimeMillis()
65:                                    - startTime;
66:
67:                            log.info(String.format("Request time: %d ms",
68:                                    elapsed));
69:                        }
70:                    }
71:                };
72:            }
73:
74:            /**
75:             * This is a contribution to the RequestHandler service configuration. This is how we extend
76:             * Tapestry using the timing filter. A common use for this kind of filter is transaction
77:             * management or security.
78:             */
79:            public void contributeRequestHandler(
80:                    OrderedConfiguration<RequestFilter> configuration,
81:                    @InjectService("TimingFilter")
82:                    RequestFilter filter) {
83:                // Each contribution to an ordered configuration has a name, When necessary, you may
84:                // set constraints to precisely control the invocation order of the contributed filter
85:                // within the pipeline.
86:
87:                configuration.add("Timing", filter);
88:            }
89:        }
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