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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.logging;

import org.jgroups.Global;
import org.jgroups.util.Util;

import java.lang.reflect.Constructor;


/**
 * Factory that creates {@link Log} instances.
 *
 * @author Manik Surtani
 * @author Bela Ban
 * @since 4.0
 */
public final class LogFactory {


    public static final boolean                 IS_SLF4J_AVAILABLE;
    public static final boolean                 IS_LOG4J2_AVAILABLE;  // log4j2 is the default logger
    protected static boolean                    use_jdk_logger;
    protected static CustomLogFactory           custom_log_factory=null;
    protected static Constructor ctor_class=null;

	private LogFactory() {
		throw new InstantiationError( "Must not instantiate this class" );
	}

    static {
        use_jdk_logger=isPropertySet(Global.USE_JDK_LOGGER);

        String classname=Util.getProperty(Global.LOG_CLASS);
        if(classname != null) {
            try {
                ctor_class=findConstructor(classname, Class.class);
            }
            catch(Exception e) {
                throw new IllegalArgumentException(String.format("failed loading logger %s", classname), e);
            }
        }

        if(use_jdk_logger || ctor_class != null)
            IS_LOG4J2_AVAILABLE=IS_SLF4J_AVAILABLE=false;
        else {
            IS_LOG4J2_AVAILABLE=isAvailable("org.apache.logging.log4j.core.Logger");
            IS_SLF4J_AVAILABLE=!IS_LOG4J2_AVAILABLE && isAvailable("org.slf4j.Logger");
        }
    }

    public static CustomLogFactory getCustomLogFactory()                         {return custom_log_factory;}
    public static void             setCustomLogFactory(CustomLogFactory factory) {custom_log_factory=factory;}
    public static boolean          useJdkLogger()                                {return use_jdk_logger;}
    public static void             useJdkLogger(boolean flag)                    {use_jdk_logger=flag;}

    public static Log getLog(Class clazz) {
        if(custom_log_factory != null)
            return custom_log_factory.getLog(clazz);
        if(ctor_class != null) {
            try {
                return ctor_class.newInstance(clazz);
            }
            catch(Throwable t) {
                throw new RuntimeException(t);
            }
        }
        if(use_jdk_logger)
            return new JDKLogImpl(clazz);
        if(IS_LOG4J2_AVAILABLE)
            return new Log4J2LogImpl(clazz);
        if(IS_SLF4J_AVAILABLE)
            return new Slf4jLogImpl(clazz);
        return new JDKLogImpl(clazz);
    }

    public static String loggerType() {
        if(ctor_class != null)
            return ctor_class.getDeclaringClass().getSimpleName();
        if(use_jdk_logger)      return "jdk";
        if(IS_LOG4J2_AVAILABLE) return "log4j2";
        if(IS_SLF4J_AVAILABLE)  return "slf4j";
        return "jdk";
    }

    protected static boolean isAvailable(String classname) {
        try {
            return Class.forName(classname) != null;
        }
        catch(ClassNotFoundException cnfe) {
            return false;
        }
    }

    protected static boolean isPropertySet(String property_name) {
        try {
            return Boolean.parseBoolean(System.getProperty(property_name));
        }
        catch(Throwable t) {
            return false;
        }
    }


    protected static Constructor findConstructor(String classname, Class arg) throws Exception {
        Class clazz=Util.loadClass(classname, (Class)null);
        return (Constructor)clazz.getDeclaredConstructor(arg);
    }
}