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19 package org.eclipse.jetty.server.handler;
20
21 import java.io.IOException;
22 import java.util.List;
23
24 import javax.servlet.ServletException;
25 import javax.servlet.http.HttpServletRequest;
26 import javax.servlet.http.HttpServletResponse;
27
28 import org.eclipse.jetty.server.Handler;
29 import org.eclipse.jetty.server.Request;
30 import org.eclipse.jetty.server.Server;
31
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36
37 public class HotSwapHandler extends AbstractHandlerContainer
38 {
39 private volatile Handler _handler;
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41
42
43
44
45 public HotSwapHandler()
46 {
47 }
48
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50
51
52
53 public Handler getHandler()
54 {
55 return _handler;
56 }
57
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60
61
62 @Override
63 public Handler[] getHandlers()
64 {
65 return new Handler[]
66 { _handler };
67 }
68
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72
73
74 public void setHandler(Handler handler)
75 {
76 if (handler == null)
77 throw new IllegalArgumentException("Parameter handler is null.");
78 try
79 {
80 updateBean(_handler,handler,true);
81 _handler=handler;
82 Server server = getServer();
83 handler.setServer(server);
84
85 }
86 catch (Exception e)
87 {
88 throw new RuntimeException(e);
89 }
90 }
91
92
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94
95
96 @Override
97 protected void doStart() throws Exception
98 {
99 super.doStart();
100 }
101
102
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104
105
106 @Override
107 protected void doStop() throws Exception
108 {
109 super.doStop();
110 }
111
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114
115
116 @Override
117 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
118 {
119 if (_handler != null && isStarted())
120 {
121 _handler.handle(target,baseRequest,request,response);
122 }
123 }
124
125
126 @Override
127 protected void expandChildren(List<Handler> list, Class<?> byClass)
128 {
129 expandHandler(_handler,list,byClass);
130 }
131
132
133 @Override
134 public void destroy()
135 {
136 if (!isStopped())
137 throw new IllegalStateException("!STOPPED");
138 Handler child = getHandler();
139 if (child != null)
140 {
141 setHandler(null);
142 child.destroy();
143 }
144 super.destroy();
145 }
146 }