io.vertx.core.logging.LoggerFactory.java Source code

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Here is the source code for io.vertx.core.logging.LoggerFactory.java

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/*
 * Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 * which is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 */

package io.vertx.core.logging;

import io.vertx.core.spi.logging.LogDelegate;
import io.vertx.core.spi.logging.LogDelegateFactory;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * @deprecated see https://github.com/eclipse-vertx/vert.x/issues/2774
 *
 * @author <a href="http://tfox.org">Tim Fox</a>
 */
public class LoggerFactory {

    public static final String LOGGER_DELEGATE_FACTORY_CLASS_NAME = "vertx.logger-delegate-factory-class-name";

    private static volatile LogDelegateFactory delegateFactory;

    private static final ConcurrentMap<String, Logger> loggers = new ConcurrentHashMap<>();

    static {
        initialise();
    }

    public static synchronized void initialise() {
        ClassLoader loader = Thread.currentThread().getContextClassLoader();
        String className;
        try {
            className = System.getProperty(LOGGER_DELEGATE_FACTORY_CLASS_NAME);
        } catch (Exception ignore) {
            className = null;
        }
        if (className != null && configureWith(className, false, loader)) {
            return;
        }
        if (loader.getResource("vertx-default-jul-logging.properties") == null) {
            if (configureWith("SLF4J", true, loader) || configureWith("Log4j", true, loader)
                    || configureWith("Log4j2", true, loader)) {
                return;
            }
        }
        // Do not use dynamic classloading here to ensure the class is visible by AOT compilers
        delegateFactory = new JULLogDelegateFactory();
    }

    private static boolean configureWith(String name, boolean shortName, ClassLoader loader) {
        String loggerName = LoggerFactory.class.getName();
        try {
            Class<?> clazz = Class.forName(
                    shortName ? "io.vertx.core.logging." + name + "LogDelegateFactory" : name, true, loader);
            LogDelegateFactory factory = (LogDelegateFactory) clazz.newInstance();
            factory.createDelegate(loggerName).debug("Using " + factory.getClass().getName());
            delegateFactory = factory;
            return true;
        } catch (Throwable ignore) {
            return false;
        }
    }

    /**
     * @deprecated see https://github.com/eclipse-vertx/vert.x/issues/2774
     */
    @Deprecated
    public static Logger getLogger(final Class<?> clazz) {
        String name = clazz.isAnonymousClass() ? clazz.getEnclosingClass().getCanonicalName()
                : clazz.getCanonicalName();
        return getLogger(name);
    }

    /**
     * @deprecated see https://github.com/eclipse-vertx/vert.x/issues/2774
     */
    @Deprecated
    public static Logger getLogger(final String name) {
        Logger logger = loggers.get(name);

        if (logger == null) {
            LogDelegate delegate = delegateFactory.createDelegate(name);

            logger = new Logger(delegate);

            Logger oldLogger = loggers.putIfAbsent(name, logger);

            if (oldLogger != null) {
                logger = oldLogger;
            }
        }

        return logger;
    }

    /**
     * @deprecated see https://github.com/eclipse-vertx/vert.x/issues/2774
     */
    @Deprecated
    public static void removeLogger(String name) {
        loggers.remove(name);
    }
}