library/log4php/LoggerMDC.php
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<?php
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/**
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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements. See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License. You may obtain a copy of the License at
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 *
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 *       http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 *
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 * @package log4php
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 */
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/**
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 * The LoggerMDC class provides _mapped diagnostic contexts_.
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 *
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 * A Mapped Diagnostic Context, or MDC in short, is an instrument for
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 * distinguishing interleaved log output from different sources. Log output
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 * is typically interleaved when a server handles multiple clients
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 * near-simultaneously.
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 *
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 * This class is similar to the {@link LoggerNDC} class except that
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 * it is based on a map instead of a stack.
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 *
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 * @version $Revision: 1343630 $
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 * @since 0.3
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 * @package log4php
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 */
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class LoggerMDC {
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    /** Holds the context map. */
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    private static $map = array();
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    /**
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     * Stores a context value as identified with the key parameter into the
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     * context map.
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     *
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     * @param string $key the key
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     * @param string $value the value
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     */
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    public static function put($key, $value) {
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        self::$map[$key] = $value;
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    }
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    /**
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     * Returns the context value identified by the key parameter.
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     *
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     * @param string $key The key.
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     * @return string The context or an empty string if no context found
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     *    for given key.
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     */
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    public static function get($key) {
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        return isset(self::$map[$key]) ? self::$map[$key] : '';
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    }
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    /**
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     * Returns the contex map as an array.
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     * @return array The MDC context map.
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     */
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    public static function getMap() {
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        return self::$map;
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    }
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    /**
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     * Removes the the context identified by the key parameter.
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     *
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     * Only affects user mappings, not $_ENV or $_SERVER.
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     *
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     * @param string $key The key to be removed.
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     */
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    public static function remove($key) {
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        unset(self::$map[$key]);
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    }
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    /**
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     * Clears the mapped diagnostic context.
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     */
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    public static function clear() {
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        self::$map = array();
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    }
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}