Source Code Cross Referenced for PnutsServlet.java in  » Scripting » Pnuts » pnuts » servlet » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » Pnuts » pnuts.servlet 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * PnutsServlet.java
003:         *
004:         * Copyright (c) 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         *
006:         * See the file "LICENSE.txt" for information on usage and redistribution
007:         * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
008:         */
009:        package pnuts.servlet;
010:
011:        import javax.servlet.http.HttpServlet;
012:        import javax.servlet.http.HttpServletRequest;
013:        import javax.servlet.http.HttpServletResponse;
014:        import javax.servlet.ServletException;
015:        import javax.servlet.ServletConfig;
016:        import javax.servlet.ServletContext;
017:        import java.io.File;
018:        import java.io.FileInputStream;
019:        import java.io.FileNotFoundException;
020:        import java.io.Reader;
021:        import java.io.InputStreamReader;
022:        import java.io.IOException;
023:        import java.util.Hashtable;
024:        import java.util.StringTokenizer;
025:        import java.util.TimeZone;
026:        import java.util.Locale;
027:        import java.net.URL;
028:        import java.net.URLClassLoader;
029:        import java.net.MalformedURLException;
030:        import java.util.HashSet;
031:        import java.util.Set;
032:        import pnuts.lang.Pnuts;
033:        import pnuts.lang.PnutsImpl;
034:        import pnuts.lang.Context;
035:        import pnuts.lang.Runtime;
036:        import pnuts.lang.Package;
037:        import pnuts.compiler.Compiler;
038:        import pnuts.compiler.CompilerPnutsImpl;
039:
040:        /**
041:         * Servlet for Pnuts scripting
042:         *
043:         * <pre>
044:         * Initparams:
045:         *   'module'   the module to be use()'d
046:         *   'compile'  scripts are compiled if true
047:         * </pre>
048:         */
049:        public class PnutsServlet extends HttpServlet {
050:
051:            public final static String SYMBOL_THIS = "this".intern();
052:            public final static String SYMBOL_REQUEST = "request".intern();
053:            public final static String SYMBOL_RESPONSE = "response".intern();
054:            public final static String SERVLET_REQUEST = "request".intern();
055:            public final static String SERVLET_RESPONSE = "response".intern();
056:            public final static String SERVLET_BUFFER = "pnuts.servlet.buffer"
057:                    .intern();
058:            public final static String EXECUTE_LATEST_SCRIPT = "pnuts.servlet.latest.script"
059:                    .intern();
060:            public final static String SERVLET_WRITER = "pnuts.servlet.writer"
061:                    .intern();
062:            public final static String SERVLET_MULTIPART_PARAM = "pnuts.servlet.multipart.param"
063:                    .intern();
064:            public final static String SERVLET_PARAM = "pnuts.servlet.parameters"
065:                    .intern();
066:            public final static String SERVLET_COOKIE = "pnuts.servlet.cookies"
067:                    .intern();
068:            public final static String SERVLET_FILE = "pnuts.servlet.file"
069:                    .intern();
070:            public final static String SERVLET_BASEDIR = "pnuts.servlet.dir"
071:                    .intern();
072:            public final static String REQUEST_SCOPE = "pnuts.servlet.request.scope"
073:                    .intern();
074:            public final static String SERVLET_COMPILER = "pnuts.servlet.compiler"
075:                    .intern();
076:            private final static String LOCALE_KEY = "pnuts$lib$locale"
077:                    .intern();
078:            private final static String TIMEZONE_KEY = "pnuts$lib$timezone"
079:                    .intern();
080:
081:            boolean debug;
082:            boolean buffering;
083:            boolean checkUpdate = true;
084:            boolean compile = true;
085:            Compiler compiler;
086:            File scriptFile;
087:            String encoding;
088:            boolean isolation;
089:            URL baseURL;
090:            String errorPage;
091:
092:            private PnutsServletContext pnutsServletContext;
093:            private Hashtable contexts = new Hashtable();
094:            private Context context = new Context();
095:            private Package pkg;
096:
097:            public PnutsServlet() {
098:            }
099:
100:            public void init() throws ServletException {
101:                ServletConfig conf = getServletConfig();
102:                debug = Boolean.valueOf(conf.getInitParameter("debug"))
103:                        .booleanValue();
104:                String module = conf.getInitParameter("module");
105:                String script = conf.getInitParameter("script");
106:                ServletContext servletContext = getServletContext();
107:                if (script != null) {
108:                    String path = servletContext.getRealPath(script);
109:                    File f = new File(path);
110:                    if (f.exists()) {
111:                        this .scriptFile = f;
112:                    }
113:                }
114:                String _compile = conf.getInitParameter("compile");
115:                boolean compile = this .compile = Boolean.valueOf(_compile)
116:                        .booleanValue();
117:                if (compile) {
118:                    this .compiler = new Compiler(null, false, true);
119:                    context.set(SERVLET_COMPILER, compiler);
120:                }
121:                String locale = conf.getInitParameter("locale");
122:                String timezone = conf.getInitParameter("timezone");
123:
124:                PnutsImpl pnutsImpl;
125:                if (compile) {
126:                    pnutsImpl = new CompilerPnutsImpl(true, true);
127:                } else {
128:                    pnutsImpl = PnutsImpl.getDefault();
129:                }
130:                context.setImplementation(pnutsImpl);
131:                String _buffering = conf.getInitParameter("buffering");
132:                if (_buffering != null) {
133:                    buffering = Boolean.valueOf(_buffering).booleanValue();
134:                } else {
135:                    buffering = true;
136:                }
137:                String check = conf.getInitParameter("execute-latest-script");
138:                if (check != null) {
139:                    checkUpdate = Boolean.valueOf(check).booleanValue();
140:                }
141:                if (checkUpdate) {
142:                    context.set(EXECUTE_LATEST_SCRIPT, Boolean.TRUE);
143:                }
144:                encoding = conf.getInitParameter("encoding"); // script encoding
145:                if (encoding != null) {
146:                    context.setScriptEncoding(encoding);
147:                }
148:                String _isolation = conf.getInitParameter("isolation");
149:                if (_isolation != null) {
150:                    isolation = Boolean.valueOf(_isolation).booleanValue();
151:                } else {
152:                    isolation = true;
153:                }
154:
155:                this .errorPage = conf.getInitParameter("error-page");
156:
157:                if (locale != null) {
158:                    StringTokenizer st = new StringTokenizer(locale, "_");
159:                    int n = st.countTokens();
160:                    Locale loc;
161:                    switch (n) {
162:                    case 0:
163:                        loc = new Locale("");
164:                        break;
165:                    case 1:
166:                        loc = new Locale(st.nextToken(), "", "");
167:                        break;
168:                    case 2:
169:                        loc = new Locale(st.nextToken(), st.nextToken(), "");
170:                        break;
171:                    default:
172:                        loc = new Locale(st.nextToken(), st.nextToken(), st
173:                                .nextToken());
174:                        break;
175:                    }
176:                    context.set(LOCALE_KEY, loc);
177:                }
178:
179:                if (timezone != null) {
180:                    context.set(TIMEZONE_KEY, TimeZone.getTimeZone(timezone));
181:                }
182:
183:                this .pkg = new Package("root", null);
184:                context.setCurrentPackage(pkg);
185:
186:                if (module != null) {
187:                    StringTokenizer st = new StringTokenizer(module, ",", false);
188:                    while (st.hasMoreTokens()) {
189:                        String mod = st.nextToken().trim();
190:                        context.usePackage(mod);
191:                    }
192:                }
193:                context.set(SYMBOL_THIS, this );
194:                context.set(SERVLET_BASEDIR, new File(servletContext
195:                        .getRealPath("/")));
196:
197:                String initialScript = conf.getInitParameter("initialScript");
198:                try {
199:                    this .baseURL = new File(servletContext.getRealPath("/"))
200:                            .toURL();
201:                    if (initialScript != null) {
202:                        String path = servletContext.getRealPath(initialScript);
203:                        File f = new File(path);
204:                        if (f.exists()) {
205:                            File dir = f.getParentFile();
206:                            context.set(SERVLET_FILE, f);
207:                            pkg.set(SYMBOL_THIS, this , context);
208:                            ClassLoader ccl = getContextClassLoader();
209:                            URL[] urls = new URL[] { dir.toURL(), baseURL };
210:                            ClassLoader loader = new URLClassLoader(urls, ccl);
211:                            ClassLoader pcl = Pnuts.createClassLoader(context,
212:                                    loader);
213:                            context.setClassLoader(pcl);
214:                            Pnuts.require(initialScript, context);
215:                        } else {
216:                            System.err.println(path + " is not found");
217:                        }
218:                    }
219:                    if (this .scriptFile != null) {
220:                        this .pnutsServletContext = createPnutsServletContext(scriptFile);
221:                    }
222:                } catch (FileNotFoundException e1) {
223:                    e1.printStackTrace();
224:                } catch (MalformedURLException e2) {
225:                    e2.printStackTrace();
226:                }
227:            }
228:
229:            protected void doGet(HttpServletRequest request,
230:                    HttpServletResponse response) throws ServletException,
231:                    IOException {
232:                do_service(request, response);
233:            }
234:
235:            protected void doPost(HttpServletRequest request,
236:                    HttpServletResponse response) throws ServletException,
237:                    IOException {
238:                do_service(request, response);
239:            }
240:
241:            protected void doPut(HttpServletRequest request,
242:                    HttpServletResponse response) throws ServletException,
243:                    IOException {
244:                do_service(request, response);
245:            }
246:
247:            protected void doDelete(HttpServletRequest request,
248:                    HttpServletResponse response) throws ServletException,
249:                    IOException {
250:                do_service(request, response);
251:            }
252:
253:            /*
254:             * Get the ClassLoader by which ServletContext finds resources and classes.
255:             * There is no standard way to get this.  We use Thread.getContextClassLoader()
256:             * here, since Tomcat 3.3a, 4.0  and Resin2.0.5 use it in J2SE environment. 
257:             */
258:            protected ClassLoader getContextClassLoader() {
259:                return Thread.currentThread().getContextClassLoader();
260:            }
261:
262:            /**
263:             * The following context-variables are defined
264:             *
265:             * <dl>
266:             * <dt>pnuts.servlet.request
267:             * <dt>pnuts.servlet.response
268:             * <dt>pnuts.servlet.file
269:             * </dl>
270:             */
271:            void do_service(HttpServletRequest request,
272:                    HttpServletResponse response) throws ServletException,
273:                    IOException {
274:                Context c = null;
275:                Package p = null;
276:                Pnuts script = null;
277:                long time = 0L;
278:                try {
279:                    File file = scriptFile;
280:                    if (file == null) {
281:                        String path = "";
282:                        String servletPath = request.getServletPath();
283:                        if (servletPath != null) {
284:                            path = servletPath;
285:                        }
286:                        if (path == null) {
287:                            path = request.getPathInfo();
288:                        }
289:                        String real_path = getServletContext()
290:                                .getRealPath(path);
291:
292:                        if (real_path != null) {
293:                            file = new File(real_path);
294:                        }
295:                    }
296:                    if (file == null || !file.exists()) {
297:                        if (debug) {
298:                            throw new FileNotFoundException();
299:                        } else {
300:                            response
301:                                    .sendError(HttpServletResponse.SC_NOT_FOUND);
302:                            return;
303:                        }
304:                    }
305:
306:                    PnutsServletContext ctx = this .pnutsServletContext;
307:                    if (ctx == null) {
308:                        synchronized (contexts) {
309:                            ctx = (PnutsServletContext) contexts.get(file);
310:                            if (ctx == null) {
311:                                ctx = createPnutsServletContext(file);
312:                                c = ctx.context;
313:                                p = ctx.basePackage;
314:                                contexts.put(file, ctx);
315:                                if (debug) {
316:                                    c.setVerbose(true);
317:                                }
318:                            } else {
319:                                c = ctx.context;
320:                                p = ctx.basePackage;
321:                                script = ctx.script;
322:                                time = ctx.time;
323:                            }
324:                        }
325:                    } else {
326:                        c = ctx.context;
327:                        p = ctx.basePackage;
328:                        script = ctx.script;
329:                        time = ctx.time;
330:                    }
331:                    c = (Context) c.clone();
332:                    Thread.currentThread().setContextClassLoader(
333:                            c.getClassLoader());
334:
335:                    boolean buffering = this .buffering;
336:                    ResponseWriter rw = new ResponseWriter(response, c,
337:                            buffering);
338:                    c.setWriter(rw);
339:                    p.set(SYMBOL_THIS, this , c);
340:
341:                    Package pkg = new Package(null, p);
342:                    pkg.set(SYMBOL_RESPONSE, response, c);
343:                    pkg.set(SYMBOL_REQUEST, request, c);
344:                    c.set(SERVLET_RESPONSE, response);
345:                    c.set(SERVLET_REQUEST, request);
346:                    c.set(REQUEST_SCOPE, pkg);
347:
348:                    c.setCurrentPackage(pkg);
349:
350:                    if (script == null) {
351:                        script = readScript(file, encoding, ctx);
352:                    } else if (checkUpdate) {
353:                        if (ctx.needToUpdate()) {
354:                            script = readScript(file, encoding, ctx);
355:                        }
356:                    }
357:                    script.run(c);
358:
359:                    if (buffering) {
360:                        rw.flushBuffer();
361:                    }
362:
363:                } catch (Throwable e) {
364:                    if (debug) {
365:                        e.printStackTrace();
366:                    } else {
367:                        System.err.println(e);
368:                    }
369:                    if (errorPage != null) {
370:                        response.sendRedirect(errorPage);
371:                    } else {
372:                        response.sendError(
373:                                HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
374:                                "");
375:                    }
376:                }
377:            }
378:
379:            PnutsServletContext createPnutsServletContext(File file)
380:                    throws MalformedURLException {
381:                ClassLoader ccl = getContextClassLoader();
382:                File dir = file.getParentFile();
383:                URL[] urls = new URL[] { dir.toURL(), baseURL };
384:                ClassLoader loader = new URLClassLoader(urls, ccl);
385:                ClassLoader pcl = Pnuts.createClassLoader(context, loader);
386:                Context c;
387:                if (isolation) {
388:                    c = new Context(context);
389:                } else {
390:                    c = (Context) context.clone();
391:                }
392:                c.setClassLoader(pcl);
393:                c.set(SERVLET_FILE, file);
394:                c.set(SYMBOL_THIS, this );
395:                Package p;
396:                if (isolation) {
397:                    p = (Package) pkg.clone();
398:                } else {
399:                    p = pkg;
400:                }
401:                PnutsServletContext ctx = new PnutsServletContext(c, p);
402:                if (debug) {
403:                    c.setVerbose(true);
404:                }
405:                return ctx;
406:            }
407:
408:            protected Pnuts parseFile(File file, String encoding,
409:                    PnutsServletContext psc) throws IOException {
410:                URL scriptURL = file.toURL();
411:                Reader reader = null;
412:                if (encoding != null) {
413:                    reader = new InputStreamReader(new FileInputStream(file),
414:                            encoding);
415:                } else {
416:                    reader = Runtime.getScriptReader(new FileInputStream(file),
417:                            context);
418:                }
419:                try {
420:                    Pnuts result = Pnuts.parse(reader, scriptURL, psc.context);
421:                    Set scriptURLs = new HashSet();
422:                    scriptURLs.add(scriptURL);
423:                    psc.scriptURLs = scriptURLs;
424:                    return result;
425:                } finally {
426:                    if (reader != null) {
427:                        reader.close();
428:                    }
429:                }
430:            }
431:
432:            protected Pnuts readScript(File file, String encoding,
433:                    PnutsServletContext psc) throws IOException {
434:                if (debug) {
435:                    System.out.println("readScript " + file);
436:                }
437:
438:                Pnuts expr = parseFile(file, encoding, psc);
439:                if (compile) {
440:                    try {
441:                        expr = compiler.compile(expr, psc.context);
442:                    } catch (ClassFormatError e) {
443:                        if (debug) {
444:                            System.out.println("compile failed (interpreting)");
445:                        }
446:                    }
447:                }
448:                psc.script = expr;
449:                psc.time = System.currentTimeMillis();
450:                return expr;
451:            }
452:
453:            public String getServletInfo() {
454:                return "Pnuts Servlet for servlet scripting. See http://pnuts.org/ for more information";
455:            }
456:        }
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