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package com.sun.jdo.spi.persistence.utility.logging;
/** This class manages the logging facility for JDO components. It is the
* class that keeps track of the log factory in use for getting loggers
* for use in JDO components.
* <P>
* This class has no JDK 1.4 dependencies.
* <P>
* The log factory is responsible for constructing the loggers and for
* ensuring that there is only one logger per component.
*
* @author Craig Russell
* @version 1.0
*/
public class LogHelper {
/** Flag to tell we are running in JDK 1.4 and can use
* java.util.logging.Logger implementation.
*/
protected static boolean jdk14 = isJDK14();
/** LoggerFactory registered for creating new loggers.
*/
protected static LoggerFactory loggerFactory = null;
/** Get a Logger. This call is delegated to the registered LoggerFactory.
* If there is no registered LoggerFactory, then initialize one based on
* whether we are running in JDK 1.4 (or higher).
* The bundle name and class loader are passed to allow the implementation
* to properly find and construct the internationalization bundle.
* This method is synchronized to avoid race conditions where two threads
* access a component using the same Logger at the same time.
* @param loggerName the relative name of this logger
* @param bundleName the fully qualified name of the resource bundle
* @param loader the class loader used to load the resource bundle, or null
* @return the logger
*/
public synchronized static Logger getLogger(String loggerName, String bundleName, ClassLoader loader) {
// if an implementation has not registered a LoggerFactory, use a standard one.
if (loggerFactory == null) {
if (jdk14) {
loggerFactory = new LoggerFactoryJDK14();
} else {
loggerFactory = new LoggerFactoryJDK13();
}
}
return loggerFactory.getLogger(loggerName, bundleName, loader);
}
/** Register a LoggerFactory for use in managed environments or
* for special situations. This
* factory will be delegated to for all getLogger requests.
* @param factory the LoggerFactory to use for all getLogger requests
*/
public static void registerLoggerFactory (LoggerFactory factory) {
loggerFactory = factory;
}
/** Check to see if the JDK 1.4 logging environment is available.
* @return true if JDK 1.4 logging is available
*/
public static boolean isJDK14() {
try {
Class logger = Class.forName("java.util.logging.Logger"); //NOI18N
return true;
} catch (ClassNotFoundException ex) {
return false;
}
}
}