1
2
3
4
5
6
7
8
9
10
11
12
13
14 package org.eclipse.jetty.server.handler;
15
16 import java.io.IOException;
17
18 import javax.servlet.ServletException;
19 import javax.servlet.http.HttpServletRequest;
20 import javax.servlet.http.HttpServletResponse;
21
22 import org.eclipse.jetty.server.Handler;
23 import org.eclipse.jetty.server.Request;
24 import org.eclipse.jetty.server.Server;
25
26
27
28
29
30
31 public class HotSwapHandler extends AbstractHandlerContainer
32 {
33 private volatile Handler _handler;
34
35
36
37
38
39 public HotSwapHandler()
40 {
41 }
42
43
44
45
46
47 public Handler getHandler()
48 {
49 return _handler;
50 }
51
52
53
54
55
56 public Handler[] getHandlers()
57 {
58 return new Handler[] {_handler};
59 }
60
61
62
63
64
65 public void setHandler(Handler handler)
66 {
67 try
68 {
69 Handler old_handler = _handler;
70
71 if (getServer()!=null)
72 getServer().getContainer().update(this, old_handler, handler, "handler");
73
74 if (handler!=null)
75 {
76 handler.setServer(getServer());
77 if (isStarted())
78 handler.start();
79 }
80
81 _handler = handler;
82
83 if (isStarted())
84 old_handler.stop();
85
86 }
87 catch(RuntimeException e)
88 {
89 throw e;
90 }
91 catch(Exception e)
92 {
93 throw new RuntimeException(e);
94 }
95 }
96
97
98
99
100
101 @Override
102 protected void doStart() throws Exception
103 {
104 if (_handler!=null)
105 _handler.start();
106 super.doStart();
107 }
108
109
110
111
112
113 @Override
114 protected void doStop() throws Exception
115 {
116 super.doStop();
117 if (_handler!=null)
118 _handler.stop();
119 }
120
121
122
123
124
125 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
126 {
127 if (_handler!=null && isStarted())
128 {
129 _handler.handle(target,baseRequest, request, response);
130 }
131 }
132
133
134
135 @Override
136 public void setServer(Server server)
137 {
138 Server old_server=getServer();
139 if (server==old_server)
140 return;
141
142 if (isRunning())
143 throw new IllegalStateException(RUNNING);
144
145 super.setServer(server);
146
147 Handler h=getHandler();
148 if (h!=null)
149 h.setServer(server);
150
151 if (server!=null && server!=old_server)
152 server.getContainer().update(this, null,_handler, "handler");
153 }
154
155
156
157 @Override
158 protected Object expandChildren(Object list, Class byClass)
159 {
160 return expandHandler(_handler,list,byClass);
161 }
162
163
164 }