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1
45 package org.openejb.loader;
46
47 import java.io.File  ;
48 import java.io.IOException ;
49 import java.util.Enumeration ;
50 import java.util.Properties ;
51 import java.lang.reflect.Method ;
52 import java.lang.reflect.InvocationTargetException ;
53
54 import javax.servlet.ServletConfig ;
55 import javax.servlet.ServletContext ;
56 import javax.servlet.ServletException ;
57 import javax.servlet.http.HttpServlet ;
58 import javax.servlet.http.HttpServletRequest ;
59 import javax.servlet.http.HttpServletResponse ;
60
61
64 public class LoaderServlet extends HttpServlet {
65
66 private Loader loader;
67
68 public void init(ServletConfig config) throws ServletException {
69 if (loader != null) {
70 return;
71 }
72
73 Properties p = initParamsToProperties(config);
76
77 String embeddingStyle = p.getProperty("openejb.loader");
78
79 if (embeddingStyle.endsWith("tomcat-webapp")) {
81 setPropertyIfNUll(p, "openejb.base", getWebappPath(config));
82 }
86
87 try {
88 SystemInstance.init(p);
89 Embedder embedder = new Embedder("org.openejb.tomcat.TomcatLoader");
90 Class loaderClass = embedder.load();
91 Object instance = loaderClass.newInstance();
92 try {
93 loader = (Loader) instance;
94 } catch (ClassCastException e) {
95 loader = new LoaderWrapper(instance);
96 }
97
98 loader.init(config);
99 } catch (Exception e) {
100 e.printStackTrace();
101 }
102 }
103
104
105 protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException , IOException {
106 loader.service(request, response);
107 }
108
109 private String getWebappPath(ServletConfig config) {
110 ServletContext ctx = config.getServletContext();
111 File webInf = new File (ctx.getRealPath("WEB-INF"));
112 File webapp = webInf.getParentFile();
113 String webappPath = webapp.getAbsolutePath();
114 return webappPath;
115 }
116
117 private Properties initParamsToProperties(ServletConfig config) {
118 Properties p = new Properties ();
119
120 p.setProperty("openejb.loader","tomcat");
122
123 Enumeration enumeration = config.getInitParameterNames();
125 System.out.println("OpenEJB init-params:");
126 while (enumeration.hasMoreElements()) {
127 String name = (String ) enumeration.nextElement();
128 String value = config.getInitParameter(name);
129 p.put(name, value);
130 System.out.println("\tparam-name: " + name + ", param-value: " + value);
131 }
132
133 return p;
134 }
135
136 private Object setPropertyIfNUll(Properties properties, String key, String value){
137 String currentValue = properties.getProperty(key);
138 if (currentValue == null){
139 properties.setProperty(key, value);
140 }
141 return currentValue;
142 }
143
144
153 public static class LoaderWrapper implements Loader {
154 private final Object loader;
155 private final Method init;
156 private final Method service;
157
158 public LoaderWrapper(Object loader) {
159 this.loader = loader;
160 try {
161 Class loaderClass = loader.getClass();
162 this.init = loaderClass.getMethod("init", new Class []{ServletConfig .class});
163 this.service = loaderClass.getMethod("service", new Class []{HttpServletRequest .class, HttpServletResponse .class});
164 } catch (NoSuchMethodException e) {
165 throw (IllegalStateException ) new IllegalStateException ("Signatures for Loader are no longer correct.").initCause(e);
166 }
167 }
168
169 public void init(ServletConfig servletConfig) throws ServletException {
170 try {
171 init.invoke(loader, new Object []{servletConfig});
172 } catch (InvocationTargetException e) {
173 Throwable cause = e.getCause();
174 if (cause instanceof RuntimeException ) {
175 throw (RuntimeException ) cause;
176 } else if (cause instanceof Error ) {
177 throw (Error ) cause;
178 } else {
179 throw (ServletException ) cause;
180 }
181 } catch (Exception e) {
182 throw new RuntimeException ("Loader.init: "+e.getMessage()+e.getClass().getName()+": "+e.getMessage(), e);
183 }
184 }
185
186 public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException , IOException {
187 try {
188 service.invoke(loader, new Object []{request, response});
189 } catch (InvocationTargetException e) {
190 Throwable cause = e.getCause();
191 if (cause instanceof RuntimeException ) {
192 throw (RuntimeException ) cause;
193 } else if (cause instanceof Error ) {
194 throw (Error ) cause;
195 } else if (cause instanceof IOException ) {
196 throw (IOException ) cause;
197 } else {
198 throw (ServletException ) cause;
199 }
200 } catch (Exception e) {
201 throw new RuntimeException ("Loader.service: "+e.getMessage()+e.getClass().getName()+": "+e.getMessage(), e);
202 }
203 }
204 }
205 }
206 |
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