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annotate src/org/eclipse/jetty/server/handler/HandlerCollection.java @ 954:a021c4c9c244
use just one SelectSet per SelectorManager
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 13 Oct 2016 00:54:10 -0600 |
parents | b9aa175d9a29 |
children | 32d4b569567c |
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1 // |
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2 // ======================================================================== |
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
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4 // ------------------------------------------------------------------------ |
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5 // All rights reserved. This program and the accompanying materials |
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6 // are made available under the terms of the Eclipse Public License v1.0 |
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7 // and Apache License v2.0 which accompanies this distribution. |
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8 // |
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9 // The Eclipse Public License is available at |
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10 // http://www.eclipse.org/legal/epl-v10.html |
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11 // |
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12 // The Apache License v2.0 is available at |
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13 // http://www.opensource.org/licenses/apache2.0.php |
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14 // |
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15 // You may elect to redistribute this code under either of these licenses. |
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16 // ======================================================================== |
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17 // |
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18 |
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19 package org.eclipse.jetty.server.handler; |
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20 |
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21 import java.io.IOException; |
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22 import java.util.concurrent.CountDownLatch; |
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23 |
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24 import javax.servlet.ServletException; |
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25 import javax.servlet.http.HttpServletRequest; |
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26 import javax.servlet.http.HttpServletResponse; |
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27 |
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28 import org.eclipse.jetty.server.Handler; |
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29 import org.eclipse.jetty.server.Request; |
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30 import org.eclipse.jetty.server.Server; |
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31 import org.eclipse.jetty.util.LazyList; |
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32 import org.eclipse.jetty.util.MultiException; |
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33 |
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34 /* ------------------------------------------------------------ */ |
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35 /** A collection of handlers. |
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36 * <p> |
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37 * The default implementations calls all handlers in list order, |
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38 * regardless of the response status or exceptions. Derived implementation |
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39 * may alter the order or the conditions of calling the contained |
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40 * handlers. |
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41 * <p> |
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42 * |
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43 * @org.apache.xbean.XBean |
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44 */ |
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45 public class HandlerCollection extends AbstractHandlerContainer |
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46 { |
848 | 47 private final boolean _mutableWhenRunning; |
48 private volatile Handler[] _handlers; | |
49 private boolean _parallelStart=false; | |
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50 |
848 | 51 /* ------------------------------------------------------------ */ |
52 public HandlerCollection() | |
53 { | |
54 _mutableWhenRunning=false; | |
55 } | |
56 | |
57 /* ------------------------------------------------------------ */ | |
58 public HandlerCollection(boolean mutableWhenRunning) | |
59 { | |
60 _mutableWhenRunning=mutableWhenRunning; | |
61 } | |
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62 |
848 | 63 /* ------------------------------------------------------------ */ |
64 /** | |
65 * @return Returns the handlers. | |
66 */ | |
67 public Handler[] getHandlers() | |
68 { | |
69 return _handlers; | |
70 } | |
71 | |
72 /* ------------------------------------------------------------ */ | |
73 /** | |
74 * | |
75 * @param handlers The handlers to set. | |
76 */ | |
77 public void setHandlers(Handler[] handlers) | |
78 { | |
79 if (!_mutableWhenRunning && isStarted()) | |
80 throw new IllegalStateException(STARTED); | |
81 | |
82 Handler [] old_handlers = _handlers==null?null:_handlers.clone(); | |
83 _handlers = handlers; | |
84 | |
85 Server server = getServer(); | |
86 MultiException mex = new MultiException(); | |
87 for (int i=0;handlers!=null && i<handlers.length;i++) | |
88 { | |
89 if (handlers[i].getServer()!=server) | |
90 handlers[i].setServer(server); | |
91 } | |
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92 |
848 | 93 // stop old handlers |
94 for (int i=0;old_handlers!=null && i<old_handlers.length;i++) | |
95 { | |
96 if (old_handlers[i]!=null) | |
97 { | |
98 try | |
99 { | |
100 if (old_handlers[i].isStarted()) | |
101 old_handlers[i].stop(); | |
102 } | |
103 catch (Throwable e) | |
104 { | |
105 mex.add(e); | |
106 } | |
107 } | |
108 } | |
109 | |
110 mex.ifExceptionThrowRuntime(); | |
111 } | |
112 | |
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113 |
848 | 114 |
115 /* ------------------------------------------------------------ */ | |
116 /** Get the parrallelStart. | |
117 * @return true if the contained handlers are started in parallel. | |
118 */ | |
119 public boolean isParallelStart() | |
120 { | |
121 return _parallelStart; | |
122 } | |
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123 |
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124 |
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125 |
848 | 126 /* ------------------------------------------------------------ */ |
127 /** Set the parallelStart. | |
128 * @param parallelStart If true, contained handlers are started in parallel. | |
129 */ | |
130 public void setParallelStart(boolean parallelStart) | |
131 { | |
132 this._parallelStart = parallelStart; | |
133 } | |
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134 |
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135 |
848 | 136 /* ------------------------------------------------------------ */ |
137 /** | |
138 * @see Handler#handle(String, Request, HttpServletRequest, HttpServletResponse) | |
139 */ | |
140 public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) | |
141 throws IOException, ServletException | |
142 { | |
143 if (_handlers!=null && isStarted()) | |
144 { | |
145 MultiException mex=null; | |
146 | |
147 for (int i=0;i<_handlers.length;i++) | |
148 { | |
149 try | |
150 { | |
151 _handlers[i].handle(target,baseRequest, request, response); | |
152 } | |
153 catch(IOException e) | |
154 { | |
155 throw e; | |
156 } | |
157 catch(RuntimeException e) | |
158 { | |
159 throw e; | |
160 } | |
161 catch(Exception e) | |
162 { | |
163 if (mex==null) | |
164 mex=new MultiException(); | |
165 mex.add(e); | |
166 } | |
167 } | |
168 if (mex!=null) | |
169 { | |
170 if (mex.size()==1) | |
171 throw new ServletException(mex.getThrowable(0)); | |
172 else | |
173 throw new ServletException(mex); | |
174 } | |
175 | |
176 } | |
177 } | |
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178 |
848 | 179 /* ------------------------------------------------------------ */ |
180 /* | |
181 * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStart() | |
182 */ | |
183 @Override | |
184 protected void doStart() throws Exception | |
185 { | |
186 final MultiException mex=new MultiException(); | |
187 if (_handlers!=null) | |
188 { | |
189 if (_parallelStart) | |
190 { | |
191 final CountDownLatch latch = new CountDownLatch(_handlers.length); | |
192 final ClassLoader loader = Thread.currentThread().getContextClassLoader(); | |
193 for (int i=0;i<_handlers.length;i++) | |
194 { | |
195 final int h=i; | |
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196 getServer().threadPool.execute( |
848 | 197 new Runnable() |
198 { | |
199 public void run() | |
200 { | |
201 ClassLoader orig = Thread.currentThread().getContextClassLoader(); | |
202 try | |
203 { | |
204 Thread.currentThread().setContextClassLoader(loader); | |
205 _handlers[h].start(); | |
206 } | |
207 catch(Throwable e) | |
208 { | |
209 mex.add(e); | |
210 } | |
211 finally | |
212 { | |
213 Thread.currentThread().setContextClassLoader(orig); | |
214 latch.countDown(); | |
215 } | |
216 } | |
217 } | |
218 ); | |
219 } | |
220 latch.await(); | |
221 } | |
222 else | |
223 { | |
224 for (int i=0;i<_handlers.length;i++) | |
225 { | |
226 try{_handlers[i].start();} | |
227 catch(Throwable e){mex.add(e);} | |
228 } | |
229 } | |
230 } | |
231 super.doStart(); | |
232 mex.ifExceptionThrow(); | |
233 } | |
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234 |
848 | 235 /* ------------------------------------------------------------ */ |
236 /* | |
237 * @see org.eclipse.jetty.server.server.handler.AbstractHandler#doStop() | |
238 */ | |
239 @Override | |
240 protected void doStop() throws Exception | |
241 { | |
242 MultiException mex=new MultiException(); | |
243 try { super.doStop(); } catch(Throwable e){mex.add(e);} | |
244 if (_handlers!=null) | |
245 { | |
246 for (int i=_handlers.length;i-->0;) | |
247 try{_handlers[i].stop();}catch(Throwable e){mex.add(e);} | |
248 } | |
249 mex.ifExceptionThrow(); | |
250 } | |
251 | |
252 /* ------------------------------------------------------------ */ | |
253 @Override | |
254 public void setServer(Server server) | |
255 { | |
256 if (isStarted()) | |
257 throw new IllegalStateException(STARTED); | |
258 | |
259 Server old_server=getServer(); | |
260 | |
261 super.setServer(server); | |
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262 |
848 | 263 Handler[] h=getHandlers(); |
264 for (int i=0;h!=null && i<h.length;i++) | |
265 h[i].setServer(server); | |
266 | |
267 } | |
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268 |
848 | 269 /* ------------------------------------------------------------ */ |
270 /* Add a handler. | |
271 * This implementation adds the passed handler to the end of the existing collection of handlers. | |
272 * @see org.eclipse.jetty.server.server.HandlerContainer#addHandler(org.eclipse.jetty.server.server.Handler) | |
273 */ | |
274 public void addHandler(Handler handler) | |
275 { | |
276 setHandlers((Handler[])LazyList.addToArray(getHandlers(), handler, Handler.class)); | |
277 } | |
278 | |
279 /* ------------------------------------------------------------ */ | |
280 public void removeHandler(Handler handler) | |
281 { | |
282 Handler[] handlers = getHandlers(); | |
283 | |
284 if (handlers!=null && handlers.length>0 ) | |
285 setHandlers((Handler[])LazyList.removeFromArray(handlers, handler)); | |
286 } | |
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287 |
848 | 288 /* ------------------------------------------------------------ */ |
289 @Override | |
290 protected Object expandChildren(Object list, Class byClass) | |
291 { | |
292 Handler[] handlers = getHandlers(); | |
293 for (int i=0;handlers!=null && i<handlers.length;i++) | |
294 list=expandHandler(handlers[i], list, byClass); | |
295 return list; | |
296 } | |
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297 |
848 | 298 /* ------------------------------------------------------------ */ |
299 @Override | |
300 public void destroy() | |
301 { | |
302 if (!isStopped()) | |
303 throw new IllegalStateException("!STOPPED"); | |
304 Handler[] children=getChildHandlers(); | |
305 setHandlers(null); | |
306 for (Handler child: children) | |
307 child.destroy(); | |
308 super.destroy(); | |
309 } | |
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310 } |