Source Code Cross Referenced for Logger.java in  » Database-DBMS » myoodb-2.2.1 » org » myoodb » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » myoodb 2.2.1 » org.myoodb.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        ///////////////////////////////////////////////////////////////////////////////
002:        //
003:        //   Copyright (C) 2003-@year@ by Thomas M. Hazel, MyOODB (www.myoodb.org)
004:        //
005:        //                          All Rights Reserved
006:        //
007:        //   This program is free software; you can redistribute it and/or modify
008:        //   it under the terms of the GNU General Public License and GNU Library
009:        //   General Public License as published by the Free Software Foundation;
010:        //   either version 2, or (at your option) any later version.
011:        //
012:        //   This program is distributed in the hope that it will be useful,
013:        //   but WITHOUT ANY WARRANTY; without even the implied warranty of
014:        //   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
015:        //   GNU General Public License and GNU Library General Public License
016:        //   for more details.
017:        //
018:        //   You should have received a copy of the GNU General Public License
019:        //   and GNU Library General Public License along with this program; if
020:        //   not, write to the Free Software Foundation, 675 Mass Ave, Cambridge,
021:        //   MA 02139, USA.
022:        //
023:        ///////////////////////////////////////////////////////////////////////////////
024:        package org.myoodb.util;
025:
026:        public class Logger {
027:            private static volatile boolean s_configured = false;
028:            private static volatile Object s_globalLogger = null;
029:
030:            private static volatile boolean s_infoEnabledFlag = true;
031:            private static volatile boolean s_debugEnabledFlag = false;
032:            private static volatile boolean s_traceEnabledFlag = false;
033:
034:            private static volatile java.lang.reflect.Method s_info = null;
035:            private static volatile java.lang.reflect.Method s_debug = null;
036:            private static volatile java.lang.reflect.Method s_trace = null;
037:            private static volatile java.lang.reflect.Method s_warn = null;
038:            private static volatile java.lang.reflect.Method s_error = null;
039:
040:            private static volatile java.lang.reflect.Method s_infoEnabled = null;
041:            private static volatile java.lang.reflect.Method s_debugEnabled = null;
042:            private static volatile java.lang.reflect.Method s_traceEnabled = null;
043:
044:            public static Logger getLogger(Class classType) {
045:                return new Logger(classType.getName());
046:            }
047:
048:            public static Logger getLogger(String classType) {
049:                return new Logger(classType);
050:            }
051:
052:            public static void setInfoEnabled(boolean flag) {
053:                s_infoEnabledFlag = flag;
054:            }
055:
056:            public static void setDebugEnabled(boolean flag) {
057:                s_debugEnabledFlag = flag;
058:            }
059:
060:            public static void setTraceEnabled(boolean flag) {
061:                s_traceEnabledFlag = flag;
062:            }
063:
064:            private Object s_logger = null;
065:
066:            private Logger(String classType)
067:    {
068:        try
069:        {
070:            if (s_configured == false)
071:            {
072:                synchronized(Logger.class)
073:                {
074:                    if (s_configured == false)
075:                    {
076:                        s_configured = true;
077:
078:                        if (@initializeLog4j@ == true)
079:                        {
080:                            Class loggerClass =  ClassLoader.getSystemClassLoader().loadClass("org.apache.log4j.BasicConfigurator");
081:                            if (loggerClass != null)
082:                            {
083:                                java.lang.reflect.Method[] methods = loggerClass.getMethods();
084:                                for (int i = 0; i < methods.length; i++)
085:                                {
086:                                    if (methods[i].getName().equals("configure") == true)
087:                                    {
088:                                        java.lang.reflect.Method method = methods[i];
089:                                        if (method.getParameterTypes().length == 0)
090:                                        {
091:                                            method.invoke(null, (java.lang.Object[]) null);
092:                                        }
093:                                    }
094:                                }
095:                            }
096:                        }
097:
098:                        Class loggerClass =  ClassLoader.getSystemClassLoader().loadClass("org.apache.log4j.Logger");
099:                        if (loggerClass != null)
100:                        {
101:                            java.lang.reflect.Method[] methods = loggerClass.getMethods();
102:                            for (int i = 0; i < methods.length; i++)
103:                            {
104:                                if (methods[i].getParameterTypes().length == 0)
105:                                {
106:                                    if (methods[i].getName().equals("isInfoEnabled") == true)
107:                                    {
108:                                        s_infoEnabled = methods[i];
109:                                    }
110:                                    else if (methods[i].getName().equals("isDebugEnabled") == true)
111:                                    {
112:                                        s_debugEnabled = methods[i];
113:                                    }
114:                                    else if (methods[i].getName().equals("isTraceEnabled") == true)
115:                                    {
116:                                        s_traceEnabled = methods[i];
117:                                    }
118:                                }
119:                                else if (methods[i].getParameterTypes().length == 1)
120:                                {
121:                                    Class paramType = methods[i].getParameterTypes()[0];
122:                                    if (Object.class.equals(paramType) == true)
123:                                    {
124:                                        if (methods[i].getName().equals("info") == true)
125:                                        {
126:                                            s_info = methods[i];
127:                                        }
128:                                        else if (methods[i].getName().equals("debug") == true)
129:                                        {
130:                                            s_debug = methods[i];
131:                                        }
132:                                        else if (methods[i].getName().equals("trace") == true)
133:                                        {
134:                                            s_trace = methods[i];
135:                                        }
136:                                        else if (methods[i].getName().equals("warn") == true)
137:                                        {
138:                                            s_warn = methods[i];
139:                                        }
140:                                        else if (methods[i].getName().equals("error") == true)
141:                                        {
142:                                            s_error = methods[i];
143:                                        }
144:                                    }
145:                                }
146:                            }
147:                        }
148:                    }
149:                }
150:            }
151:        }
152:        catch (Exception e)
153:        {
154:            // nothing to do
155:        }
156:
157:        try
158:        {
159:            Class loggerClass =  ClassLoader.getSystemClassLoader().loadClass("org.apache.log4j.Logger");
160:            if (loggerClass != null)
161:            {
162:                java.lang.reflect.Method[] methods = loggerClass.getMethods();
163:                for (int i = 0; i < methods.length; i++)
164:                {
165:                    if (methods[i].getName().equals("getLogger") == true)
166:                    {
167:                        java.lang.reflect.Method method = methods[i];
168:                        if (method.getParameterTypes().length == 1)
169:                        {
170:                            Class paramType = method.getParameterTypes()[0];
171:                            if (String.class.equals(paramType) == true)
172:                            {
173:                                s_logger = method.invoke(null, new Object[] {classType});
174:                                break;
175:                            }
176:                        }
177:                    }
178:                }
179:            }
180:        }
181:        catch (java.lang.Exception e)
182:        {
183:            if (s_globalLogger == null)
184:            {
185:                synchronized(Logger.class)
186:                {
187:                    if (s_globalLogger == null)
188:                    {
189:                        java.lang.reflect.Method[] methods = java.io.PrintStream.class.getMethods();
190:                        for (int i = 0; i < methods.length; i++)
191:                        {
192:                            if (methods[i].getParameterTypes().length == 1)
193:                            {
194:                                Class paramType = methods[i].getParameterTypes()[0];
195:                                if (Object.class.equals(paramType) == true)
196:                                {
197:                                if (methods[i].getName().equals("println") == true)
198:                                    {
199:                                        s_info = methods[i];
200:                                        s_debug = methods[i];
201:                                        s_trace = methods[i];
202:                                        s_warn = methods[i];
203:                                        s_error = methods[i];
204:                                        break;
205:                                    }
206:                                }
207:                            }
208:                        }
209:
210:                        s_globalLogger = System.out;
211:                    }
212:                }
213:            }
214:
215:            s_logger = s_globalLogger;
216:        }
217:    }
218:
219:            private String trace(Throwable t) {
220:                String trace = "";
221:                java.io.StringWriter stringWriter = new java.io.StringWriter();
222:                java.io.PrintWriter printWriter = new java.io.PrintWriter(
223:                        stringWriter);
224:
225:                t.printStackTrace(printWriter);
226:                String ste[] = stringWriter.toString().split("\n");
227:
228:                for (int i = 0; i < ste.length; i++) {
229:                    String line = ste[i].toString();
230:                    trace += line + "\n";
231:                }
232:
233:                return trace;
234:            }
235:
236:            public void info(Object message) {
237:                try {
238:                    s_info.invoke(s_logger, new Object[] { message });
239:                } catch (java.lang.Exception e) {
240:                    e.printStackTrace();
241:                }
242:            }
243:
244:            public void info(Object message, Throwable t) {
245:                try {
246:                    if (message != null) {
247:                        s_info.invoke(s_logger, new Object[] { message });
248:                    }
249:
250:                    if (t != null) {
251:                        s_info.invoke(s_logger, new Object[] { trace(t) });
252:                    }
253:                } catch (java.lang.Exception e) {
254:                    e.printStackTrace();
255:                }
256:            }
257:
258:            public void debug(Object message) {
259:                try {
260:                    s_debug.invoke(s_logger, new Object[] { message });
261:                } catch (java.lang.Exception e) {
262:                    e.printStackTrace();
263:                }
264:            }
265:
266:            public void debug(Object message, Throwable t) {
267:                try {
268:                    if (message != null) {
269:                        s_debug.invoke(s_logger, new Object[] { message });
270:                    }
271:
272:                    if (t != null) {
273:                        s_debug.invoke(s_logger, new Object[] { trace(t) });
274:                    }
275:                } catch (java.lang.Exception e) {
276:                    e.printStackTrace();
277:                }
278:            }
279:
280:            public void trace(Object message) {
281:                try {
282:                    s_trace.invoke(s_logger, new Object[] { message });
283:                } catch (java.lang.Exception e) {
284:                    e.printStackTrace();
285:                }
286:            }
287:
288:            public void trace(Object message, Throwable t) {
289:                try {
290:                    if (message != null) {
291:                        s_trace.invoke(s_logger, new Object[] { message });
292:                    }
293:
294:                    if (t != null) {
295:                        s_trace.invoke(s_logger, new Object[] { trace(t) });
296:                    }
297:                } catch (java.lang.Exception e) {
298:                    e.printStackTrace();
299:                }
300:            }
301:
302:            public void warn(Object message) {
303:                try {
304:                    s_warn.invoke(s_logger, new Object[] { message });
305:                } catch (java.lang.Exception e) {
306:                    e.printStackTrace();
307:                }
308:            }
309:
310:            public void warn(Object message, Throwable t) {
311:                try {
312:                    if (message != null) {
313:                        s_warn.invoke(s_logger, new Object[] { message });
314:                    }
315:
316:                    if (t != null) {
317:                        s_warn.invoke(s_logger, new Object[] { trace(t) });
318:                    }
319:                } catch (java.lang.Exception e) {
320:                    e.printStackTrace();
321:                }
322:            }
323:
324:            public void error(Object message) {
325:                try {
326:                    s_error.invoke(s_logger, new Object[] { message });
327:                } catch (java.lang.Exception e) {
328:                    e.printStackTrace();
329:                }
330:            }
331:
332:            public void error(Object message, Throwable t) {
333:                try {
334:                    if (message != null) {
335:                        s_error.invoke(s_logger, new Object[] { message });
336:                    }
337:
338:                    if (t != null) {
339:                        s_error.invoke(s_logger, new Object[] { trace(t) });
340:                    }
341:                } catch (java.lang.Exception e) {
342:                    e.printStackTrace();
343:                }
344:            }
345:
346:            public boolean isInfoEnabled() {
347:                try {
348:                    return (s_infoEnabled != null) ? (Boolean) s_infoEnabled
349:                            .invoke(s_logger, (java.lang.Object[]) null)
350:                            : s_infoEnabledFlag;
351:                } catch (Exception e) {
352:                    return false;
353:                }
354:            }
355:
356:            public boolean isDebugEnabled() {
357:                try {
358:                    return (s_debugEnabled != null) ? (Boolean) s_debugEnabled
359:                            .invoke(s_logger, (java.lang.Object[]) null)
360:                            : s_debugEnabledFlag;
361:                } catch (Exception e) {
362:                    return false;
363:                }
364:            }
365:
366:            public boolean isTraceEnabled() {
367:                try {
368:                    return (s_traceEnabled != null) ? (Boolean) s_traceEnabled
369:                            .invoke(s_logger, (java.lang.Object[]) null)
370:                            : s_traceEnabledFlag;
371:                } catch (Exception e) {
372:                    return false;
373:                }
374:            }
375:        }
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