001: /*
002: * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
003: *
004: * This file is part of Resin(R) Open Source
005: *
006: * Each copy or derived work must preserve the copyright notice and this
007: * notice unmodified.
008: *
009: * Resin Open Source is free software; you can redistribute it and/or modify
010: * it under the terms of the GNU General Public License as published by
011: * the Free Software Foundation; either version 2 of the License, or
012: * (at your option) any later version.
013: *
014: * Resin Open Source is distributed in the hope that it will be useful,
015: * but WITHOUT ANY WARRANTY; without even the implied warranty of
016: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017: * of NON-INFRINGEMENT. See the GNU General Public License for more
018: * details.
019: *
020: * You should have received a copy of the GNU General Public License
021: * along with Resin Open Source; if not, write to the
022: *
023: * Free Software Foundation, Inc.
024: * 59 Temple Place, Suite 330
025: * Boston, MA 02111-1307 USA
026: *
027: * @author Scott Ferguson
028: */
029:
030: package com.caucho.server.rewrite;
031:
032: import com.caucho.server.webapp.WebApp;
033: import com.caucho.server.dispatch.ServletConfigImpl;
034: import com.caucho.config.program.ContainerProgram;
035: import com.caucho.config.program.ConfigProgram;
036: import com.caucho.config.ConfigException;
037: import com.caucho.util.L10N;
038:
039: import javax.servlet.FilterChain;
040: import javax.servlet.ServletException;
041: import java.util.logging.Level;
042: import java.util.logging.Logger;
043:
044: public class LoadBalanceRule extends AbstractRuleWithConditions {
045: private static final L10N L = new L10N(LoadBalanceRule.class);
046: private static final Logger log = Logger
047: .getLogger(LoadBalanceRule.class.getName());
048:
049: private final WebApp _webApp;
050:
051: private ServletConfigImpl _servlet;
052:
053: private ContainerProgram _program = new ContainerProgram();
054:
055: LoadBalanceRule(RewriteDispatch rewriteDispatch, WebApp webApp) {
056: super (rewriteDispatch);
057:
058: _webApp = webApp;
059: }
060:
061: public String getTagName() {
062: return "load-balance";
063: }
064:
065: public void addBuilderProgram(ConfigProgram program) {
066: _program.addProgram(program);
067: }
068:
069: @Override
070: public FilterChain dispatch(String uri, String queryString,
071: FilterChain accept, FilterChainMapper next)
072: throws ServletException {
073: return _servlet.createServletChain();
074: }
075:
076: @Override
077: public void init() throws ConfigException {
078: super .init();
079:
080: try {
081: _servlet = new ServletConfigImpl();
082:
083: _servlet.setServletName("resin-dispatch-lb");
084: Class cl = Class
085: .forName("com.caucho.servlets.LoadBalanceServlet");
086: _servlet
087: .setServletClass("com.caucho.servlets.LoadBalanceServlet");
088:
089: _servlet.setInit(_program);
090:
091: _webApp.addServlet(_servlet);
092: } catch (ServletException ex) {
093: throw ConfigException.create(ex);
094: } catch (ClassNotFoundException e) {
095: log.log(Level.FINER, e.toString(), e);
096:
097: throw new ConfigException(L
098: .l("load-balance requires Resin Professional"));
099: }
100: }
101: }
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