blob: 0e6a3fc42410425cd6fdc4408647afe93ab83a26 (
plain)
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
|
/*
* Copyright 2013 gitblit.com.
*
* 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 com.gitblit.dagger;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import dagger.ObjectGraph;
/**
* Dagger servlet context listener is a context listener that uses Dagger to
* instantiate and inject servlets, filters, and anything else you might want.
*
* @author James Moger
*
*/
public abstract class DaggerContext implements ServletContextListener {
public static final String INJECTOR_NAME = ObjectGraph.class.getName();
protected final Logger logger = LoggerFactory.getLogger(getClass());
protected abstract Object [] getModules();
protected abstract void destroyContext(ServletContext context);
protected ObjectGraph getInjector(ServletContext context) {
Object o = context.getAttribute(INJECTOR_NAME);
if (o == null) {
logger.debug("instantiating Dagger modules");
Object [] modules = getModules();
logger.debug("getting Dagger injector");
try {
o = ObjectGraph.create(modules);
logger.debug("setting Dagger injector into {} attribute", INJECTOR_NAME);
context.setAttribute(INJECTOR_NAME, o);
} catch (Throwable t) {
logger.error("an error occurred creating the Dagger injector", t);
}
}
return (ObjectGraph) o;
}
@Override
public final void contextDestroyed(ServletContextEvent contextEvent) {
ServletContext context = contextEvent.getServletContext();
context.removeAttribute(INJECTOR_NAME);
destroyContext(context);
}
}
|
