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The JBoss Logging Framework
There is a newer version: 3.6.1.Final
/*
 * JBoss, Home of Professional Open Source.
 *
 * Copyright 2023 Red Hat, Inc.
 *
 * Licensed 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 org.jboss.logging;

import static org.jboss.logmanager.Logger.AttachmentKey;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.jboss.logmanager.LogContext;
import org.jboss.logmanager.MDC;
import org.jboss.logmanager.NDC;

/**
 * An implementation of the {@linkplain LoggerProvider log provider} for the JBoss Log Manager.
 */
public final class JBossLogManagerProvider implements LoggerProvider {

    private static final AttachmentKey KEY = new AttachmentKey<>();
    private static final AttachmentKey> LEGACY_KEY = new AttachmentKey<>();

    @Override
    public Logger getLogger(final String name) {
        final SecurityManager sm = System.getSecurityManager();
        if (sm != null) {
            return AccessController.doPrivileged((PrivilegedAction) () -> {
                try {
                    return doGetLogger(name);
                } catch (NoSuchMethodError ignore) {
                }
                // fallback
                return doLegacyGetLogger(name);
            });
        } else {
            try {
                return doGetLogger(name);
            } catch (NoSuchMethodError ignore) {
            }
            // fallback
            return doLegacyGetLogger(name);
        }
    }

    private static Logger doLegacyGetLogger(final String name) {
        final org.jboss.logmanager.Logger lmLogger = LogContext.getLogContext().getLogger("");
        ConcurrentMap loggers = lmLogger.getAttachment(LEGACY_KEY);
        if (loggers == null) {
            loggers = new ConcurrentHashMap<>();
            final ConcurrentMap appearing = lmLogger.attachIfAbsent(LEGACY_KEY, loggers);
            if (appearing != null) {
                loggers = appearing;
            }
        }

        Logger l = loggers.get(name);
        if (l != null) {
            return l;
        }

        final org.jboss.logmanager.Logger logger = org.jboss.logmanager.Logger.getLogger(name);
        l = new JBossLogManagerLogger(name, logger);
        final Logger appearing = loggers.putIfAbsent(name, l);
        if (appearing == null) {
            return l;
        }
        return appearing;
    }

    private static Logger doGetLogger(final String name) {
        Logger l = LogContext.getLogContext().getAttachment(name, KEY);
        if (l != null) {
            return l;
        }
        final org.jboss.logmanager.Logger logger = org.jboss.logmanager.Logger.getLogger(name);
        l = new JBossLogManagerLogger(name, logger);
        Logger a = logger.attachIfAbsent(KEY, l);
        if (a == null) {
            return l;
        } else {
            return a;
        }
    }

    @Override
    public void clearMdc() {
        MDC.clear();
    }

    @Override
    public Object putMdc(final String key, final Object value) {
        return MDC.putObject(key, value);
    }

    @Override
    public Object getMdc(final String key) {
        return MDC.getObject(key);
    }

    @Override
    public void removeMdc(final String key) {
        MDC.removeObject(key);
    }

    @Override
    public Map getMdcMap() {
        // we can re-define the erasure of this map because MDC does not make further use of the copy
        return MDC.copyObject();
    }

    @Override
    public void clearNdc() {
        NDC.clear();
    }

    @Override
    public String getNdc() {
        return NDC.get();
    }

    @Override
    public int getNdcDepth() {
        return NDC.getDepth();
    }

    @Override
    public String popNdc() {
        return NDC.pop();
    }

    @Override
    public String peekNdc() {
        return NDC.get();
    }

    @Override
    public void pushNdc(final String message) {
        NDC.push(message);
    }

    @Override
    public void setNdcMaxDepth(final int maxDepth) {
        NDC.trimTo(maxDepth);
    }
}