Source Code Cross Referenced for Log4jConfigurer.java in  » J2EE » spring-framework-2.5 » org » springframework » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2005 the original author or authors.
003:         * 
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         * 
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         * 
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.util;
018:
019:        import java.io.File;
020:        import java.io.FileNotFoundException;
021:        import java.net.URL;
022:
023:        import org.apache.log4j.LogManager;
024:        import org.apache.log4j.PropertyConfigurator;
025:        import org.apache.log4j.xml.DOMConfigurator;
026:
027:        /**
028:         * Convenience class that features simple methods for custom Log4J configuration.
029:         *
030:         * <p>Only needed for non-default Log4J initialization, for example with a custom
031:         * config location or a refresh interval. By default, Log4J will simply read its
032:         * configuration from a "log4j.properties" file in the root of the class path.
033:         *
034:         * <p>For web environments, the analogous Log4jWebConfigurer class can be found
035:         * in the web package, reading in its configuration from context-params in web.xml.
036:         * In a J2EE web application, Log4J is usually set up via Log4jConfigListener or
037:         * Log4jConfigServlet, delegating to Log4jWebConfigurer underneath.
038:         *
039:         * @author Juergen Hoeller
040:         * @since 13.03.2003
041:         * @see org.springframework.web.util.Log4jWebConfigurer
042:         * @see org.springframework.web.util.Log4jConfigListener
043:         * @see org.springframework.web.util.Log4jConfigServlet
044:         */
045:        public abstract class Log4jConfigurer {
046:
047:            /** Pseudo URL prefix for loading from the class path: "classpath:" */
048:            public static final String CLASSPATH_URL_PREFIX = "classpath:";
049:
050:            /** Extension that indicates a Log4J XML config file: ".xml" */
051:            public static final String XML_FILE_EXTENSION = ".xml";
052:
053:            /**
054:             * Initialize Log4J from the given file location, with no config file refreshing.
055:             * Assumes an XML file in case of a ".xml" file extension, and a properties file else.
056:             * @param location the location of the config file: either a "classpath:" location
057:             * (e.g. "classpath:myLog4j.properties"), an absolute file URL
058:             * (e.g. "file:C:/log4j.properties), or a plain absolute path in the file system
059:             * (e.g. "C:/log4j.properties")
060:             * @throws FileNotFoundException if the location specifies an invalid file path
061:             */
062:            public static void initLogging(String location)
063:                    throws FileNotFoundException {
064:                String resolvedLocation = SystemPropertyUtils
065:                        .resolvePlaceholders(location);
066:                URL url = ResourceUtils.getURL(resolvedLocation);
067:                if (resolvedLocation.toLowerCase().endsWith(XML_FILE_EXTENSION)) {
068:                    DOMConfigurator.configure(url);
069:                } else {
070:                    PropertyConfigurator.configure(url);
071:                }
072:            }
073:
074:            /**
075:             * Initialize Log4J from the given location, with the given refresh interval
076:             * for the config file. Assumes an XML file in case of a ".xml" file extension,
077:             * and a properties file else.
078:             * <p>Log4J's watchdog thread will asynchronously check whether the timestamp
079:             * of the config file has changed, using the given interval between checks.
080:             * A refresh interval of 1000 milliseconds (one second), which allows to
081:             * do on-demand log level changes with immediate effect, is not unfeasible.
082:             * <p><b>WARNING:</b> Log4J's watchdog thread does not terminate until VM shutdown;
083:             * in particular, it does not terminate on LogManager shutdown. Therefore, it is
084:             * recommended to <i>not</i> use config file refreshing in a production J2EE
085:             * environment; the watchdog thread would not stop on application shutdown there.
086:             * @param location the location of the config file: either a "classpath:" location
087:             * (e.g. "classpath:myLog4j.properties"), an absolute file URL
088:             * (e.g. "file:C:/log4j.properties), or a plain absolute path in the file system
089:             * (e.g. "C:/log4j.properties")
090:             * @param refreshInterval interval between config file refresh checks, in milliseconds
091:             * @throws FileNotFoundException if the location specifies an invalid file path
092:             */
093:            public static void initLogging(String location, long refreshInterval)
094:                    throws FileNotFoundException {
095:                String resolvedLocation = SystemPropertyUtils
096:                        .resolvePlaceholders(location);
097:                File file = ResourceUtils.getFile(resolvedLocation);
098:                if (!file.exists()) {
099:                    throw new FileNotFoundException("Log4J config file ["
100:                            + resolvedLocation + "] not found");
101:                }
102:                if (resolvedLocation.toLowerCase().endsWith(XML_FILE_EXTENSION)) {
103:                    DOMConfigurator.configureAndWatch(file.getAbsolutePath(),
104:                            refreshInterval);
105:                } else {
106:                    PropertyConfigurator.configureAndWatch(file
107:                            .getAbsolutePath(), refreshInterval);
108:                }
109:            }
110:
111:            /**
112:             * Shut down Log4J, properly releasing all file locks.
113:             * <p>This isn't strictly necessary, but recommended for shutting down
114:             * Log4J in a scenario where the host VM stays alive (for example, when
115:             * shutting down an application in a J2EE environment).
116:             */
117:            public static void shutdownLogging() {
118:                LogManager.shutdown();
119:            }
120:
121:            /**
122:             * Set the specified system property to the current working directory.
123:             * <p>This can be used e.g. for test environments, for applications that leverage
124:             * Log4jWebConfigurer's "webAppRootKey" support in a web environment.
125:             * @param key system property key to use, as expected in Log4j configuration
126:             * (for example: "demo.root", used as "${demo.root}/WEB-INF/demo.log")
127:             * @see org.springframework.web.util.Log4jWebConfigurer
128:             */
129:            public static void setWorkingDirSystemProperty(String key) {
130:                System.setProperty(key, new File("").getAbsolutePath());
131:            }
132:
133:        }
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