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The Pax Logging API Library is to allow for the Pax Logging Service to be reloaded without stopping the many dependent bundles. It also contains the OSGi Log Service API and the Knopflerfish Log API.

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/*
 * JBoss, Home of Professional Open Source.
 *
 * Copyright 2010 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 java.util.Collections;
import java.util.Map;

/**
 * Mapped diagnostic context. Each log provider implementation may behave different.
 */
public final class MDC {

    private MDC() {
    }

    /**
     * Puts the value onto the context.
     *
     * @param key the key for the value
     * @param val the value
     *
     * @return the previous value set or {@code null} if no value was set
     */
    public static Object put(String key, Object val) {
        return LoggerProviders.PROVIDER.putMdc(key, val);
    }

    /**
     * Returns the value for the key or {@code null} if no value was found.
     *
     * @param key the key to lookup the value for
     *
     * @return the value or {@code null} if not found
     */
    public static Object get(String key) {
        return LoggerProviders.PROVIDER.getMdc(key);
    }

    /**
     * Removes the value from the context.
     *
     * @param key the key of the value to remove
     */
    public static void remove(String key) {
        LoggerProviders.PROVIDER.removeMdc(key);
    }

    /**
     * Returns the map from the context.
     *
     * 
     * Note that in most implementations this is an expensive operation and should be used sparingly.
     * 
     *
     * @return the map from the context or an {@linkplain Collections#emptyMap() empty map} if the context is {@code
     * null}
     */
    public static Map getMap() {
        return LoggerProviders.PROVIDER.getMdcMap();
    }

    /**
     * Clears the message diagnostics context.
     */
    public static void clear() {
        LoggerProviders.PROVIDER.clearMdc();
    }
}