2 * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
3 * Copyright (C) $$Year-Rel$$ The Jalview Authors
5 * This file is part of Jalview.
7 * Jalview is free software: you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation, either version 3
10 * of the License, or (at your option) any later version.
12 * Jalview is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR
15 * PURPOSE. See the GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Jalview. If not, see <http://www.gnu.org/licenses/>.
19 * The Jalview Authors are detailed in the 'AUTHORS' file.
21 package jalview.httpserver;
23 import jalview.bin.ApplicationSingletonProvider;
24 import jalview.bin.ApplicationSingletonProvider.ApplicationSingletonI;
25 import jalview.rest.RestHandler;
27 import java.net.BindException;
29 import java.util.Collections;
30 import java.util.HashMap;
33 import javax.servlet.http.HttpServletRequest;
34 import javax.servlet.http.HttpServletResponse;
36 import org.eclipse.jetty.server.Handler;
37 import org.eclipse.jetty.server.Server;
38 import org.eclipse.jetty.server.ServerConnector;
39 import org.eclipse.jetty.server.handler.ContextHandler;
40 import org.eclipse.jetty.server.handler.HandlerCollection;
41 import org.eclipse.jetty.util.thread.QueuedThreadPool;
44 * An HttpServer built on Jetty. To use it
46 * <li>call getInstance() to create and start the server</li>
47 * <li>call registerHandler to add a handler for a path (below /jalview)</li>
48 * <li>when finished, call removedHandler</li>
52 * @see http://eclipse.org/jetty/documentation/current/embedding-jetty.html
54 public class HttpServer implements ApplicationSingletonI
57 * Returns the singleton instance of this class.
60 * @throws BindException
62 public static HttpServer getInstance() throws BindException
64 synchronized (HttpServer.class)
66 return (HttpServer) ApplicationSingletonProvider.getInstance(HttpServer.class);
70 * 'context root' - actually just prefixed to the path for each handler for
71 * now - see registerHandler
73 private static final String JALVIEW_PATH = "jalview";
78 private Server server;
81 * Registered handlers for context paths
83 private HandlerCollection contextHandlers;
86 * Lookup of ContextHandler by its wrapped handler
88 Map<Handler, ContextHandler> myHandlers = new HashMap<Handler, ContextHandler>();
91 * The context root for the server
93 private URI contextRoot;
97 * Private constructor to enforce use of singleton
99 * @throws BindException
100 * if no free port can be assigned
102 private HttpServer() throws BindException
107 * Provides a REST server by default; add more programmatically as required
109 registerHandler(RestHandler.getInstance());
113 * Start the http server
115 * @throws BindException
117 private void startServer() throws BindException
122 * Create a server with a small number of threads; jetty will allocate a
125 QueuedThreadPool tp = new QueuedThreadPool(4, 1); // max, min
126 server = new Server(tp);
127 // 2 selector threads to handle incoming connections
128 ServerConnector connector = new ServerConnector(server, 0, 2);
129 // restrict to localhost
130 connector.setHost("localhost");
131 server.addConnector(connector);
134 * HttpServer shuts down with Jalview process
136 server.setStopAtShutdown(true);
139 * Create a mutable set of handlers (can add handlers while the server is
140 * running). Using vanilla handlers here rather than servlets
142 // TODO how to properly configure context root "/jalview"
143 contextHandlers = new HandlerCollection(true);
144 server.setHandler(contextHandlers);
146 // System.out.println(String.format(
147 // "HttpServer started with %d threads", server.getThreadPool()
149 contextRoot = server.getURI();
150 } catch (Exception e)
153 "Error trying to start HttpServer: " + e.getMessage());
157 } catch (Exception e1)
159 e1.printStackTrace();
164 throw new BindException("HttpServer failed to allocate a port");
169 * Returns the URI on which we are listening
175 return server == null ? null : server.getURI();
179 * For debug - write HTTP request details to stdout
184 protected void dumpRequest(HttpServletRequest request,
185 HttpServletResponse response)
187 for (String hdr : Collections.list(request.getHeaderNames()))
189 for (String val : Collections.list(request.getHeaders(hdr)))
191 System.out.println(hdr + ": " + val);
194 for (String param : Collections.list(request.getParameterNames()))
196 for (String val : request.getParameterValues(param))
198 System.out.println(param + "=" + val);
204 * Stop the Http server.
206 public void stopServer()
210 if (server.isStarted())
215 } catch (Exception e)
217 System.err.println("Error stopping Http Server on "
218 + server.getURI() + ": " + e.getMessage());
225 * Register a handler for the given path and set its URI
229 * @throws IllegalStateException
230 * if handler path has not been set
232 public void registerHandler(AbstractRequestHandler handler)
234 String path = handler.getPath();
237 throw new IllegalStateException(
238 "Must set handler path before registering handler");
241 // http://stackoverflow.com/questions/20043097/jetty-9-embedded-adding-handlers-during-runtime
242 ContextHandler ch = new ContextHandler();
243 ch.setAllowNullPathInfo(true);
244 ch.setContextPath("/" + JALVIEW_PATH + "/" + path);
245 ch.setResourceBase(".");
246 ch.setClassLoader(Thread.currentThread().getContextClassLoader());
247 ch.setHandler(handler);
250 * Remember the association so we can remove it later
252 this.myHandlers.put(handler, ch);
255 * A handler added to a running server must be started explicitly
257 contextHandlers.addHandler(ch);
261 } catch (Exception e)
264 "Error starting handler for " + path + ": " + e.getMessage());
267 handler.setUri(this.contextRoot + ch.getContextPath().substring(1));
268 System.out.println("Jalview " + handler.getName()
269 + " handler started on " + handler.getUri());
273 * Removes the handler from the server; more precisely, remove the
274 * ContextHandler wrapping the specified handler
278 public void removeHandler(AbstractRequestHandler handler)
281 * Have to use this cached lookup table since there is no method
282 * ContextHandler.getHandler()
284 ContextHandler ch = myHandlers.get(handler);
287 contextHandlers.removeHandler(ch);
288 myHandlers.remove(handler);
289 System.out.println("Stopped Jalview " + handler.getName()
290 + " handler on " + handler.getUri());