/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.util.internal.logging;

import io.netty.util.internal.ThreadLocalRandom;

/**
 * Creates an {@link InternalLogger} or changes the default factory
 * implementation.  This factory allows you to choose what logging framework
 * Netty should use.  The default factory is {@link Slf4JLoggerFactory}.  If SLF4J
 * is not available, {@link Log4JLoggerFactory} is used.  If Log4J is not available,
 * {@link JdkLoggerFactory} is used.  You can change it to your preferred
 * logging framework before other Netty classes are loaded:
 * <pre>
 * {@link InternalLoggerFactory}.setDefaultFactory({@link Log4JLoggerFactory}.INSTANCE);
 * </pre>
 * Please note that the new default factory is effective only for the classes
 * which were loaded after the default factory is changed.  Therefore,
 * {@link #setDefaultFactory(InternalLoggerFactory)} should be called as early
 * as possible and shouldn't be called more than once.
 */
public abstract class InternalLoggerFactory {

    private static volatile InternalLoggerFactory defaultFactory =
            newDefaultFactory(InternalLoggerFactory.class.getName());

    static {
        // Initiate some time-consuming background jobs here,
        // because this class is often initialized at the earliest time.
        try {
            Class.forName(ThreadLocalRandom.class.getName(), true, InternalLoggerFactory.class.getClassLoader());
        } catch (Exception ignored) {
            // Should not fail, but it does not harm to fail.
        }
    }

    @SuppressWarnings("UnusedCatchParameter")
    private static InternalLoggerFactory newDefaultFactory(String name) {
        InternalLoggerFactory f;
        try {
            f = new Slf4JLoggerFactory(true);
            f.newInstance(name).debug("Using SLF4J as the default logging framework");
        } catch (Throwable t1) {
            try {
                f = Log4JLoggerFactory.INSTANCE;
                f.newInstance(name).debug("Using Log4J as the default logging framework");
            } catch (Throwable t2) {
                f = JdkLoggerFactory.INSTANCE;
                f.newInstance(name).debug("Using java.util.logging as the default logging framework");
            }
        }
        return f;
    }

    /**
     * Returns the default factory.  The initial default factory is
     * {@link JdkLoggerFactory}.
     */
    public static InternalLoggerFactory getDefaultFactory() {
        return defaultFactory;
    }

    /**
     * Changes the default factory.
     */
    public static void setDefaultFactory(InternalLoggerFactory defaultFactory) {
        if (defaultFactory == null) {
            throw new NullPointerException("defaultFactory");
        }
        InternalLoggerFactory.defaultFactory = defaultFactory;
    }

    /**
     * Creates a new logger instance with the name of the specified class.
     */
    public static InternalLogger getInstance(Class<?> clazz) {
        return getInstance(clazz.getName());
    }

    /**
     * Creates a new logger instance with the specified name.
     */
    public static InternalLogger getInstance(String name) {
        return getDefaultFactory().newInstance(name);
    }

    /**
     * Creates a new logger instance with the specified name.
     */
    protected abstract InternalLogger newInstance(String name);
}

@@ -628,16 +628,17 @@
 se.%0A */%0A
+%0A
 package 
@@ -674,58 +674,8 @@
 g;%0A%0A
-import io.netty.util.internal.ThreadLocalRandom;%0A%0A
 /**%0A
@@ -1631,473 +1631,9 @@
 tory
- =%0A            newDefaultFactory(InternalLoggerFactory.class.getName());%0A%0A    static %7B%0A        // Initiate some time-consuming background jobs here,%0A        // because this class is often initialized at the earliest time.%0A        try %7B%0A            Class.forName(ThreadLocalRandom.class.getName(), true, InternalLoggerFactory.class.getClassLoader());%0A        %7D catch (Exception ignored) %7B%0A            // Should not fail, but it does not harm to fail.%0A        %7D%0A    %7D
+;
 %0A%0A  
@@ -2532,24 +2532,159 @@
 Factory() %7B%0A
+        if (defaultFactory == null) %7B%0A            defaultFactory = newDefaultFactory(InternalLoggerFactory.class.getName());%0A        %7D%0A
         retu
@@ -3569,10 +3569,11 @@
  name);%0A
+%0A
 %7D%0A

Do not eagerly initialize the logger factory