1/**
2 * Copyright (c) 2004-2011 QOS.ch
3 * All rights reserved.
4 *
5 * Permission is hereby granted, free  of charge, to any person obtaining
6 * a  copy  of this  software  and  associated  documentation files  (the
7 * "Software"), to  deal in  the Software without  restriction, including
8 * without limitation  the rights to  use, copy, modify,  merge, publish,
9 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
10 * permit persons to whom the Software  is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The  above  copyright  notice  and  this permission  notice  shall  be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
17 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
18 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 */
25package org.slf4j.impl;
26
27import java.util.concurrent.ConcurrentHashMap;
28import java.util.concurrent.ConcurrentMap;
29
30import org.slf4j.Logger;
31import org.slf4j.ILoggerFactory;
32
33/**
34 * An implementation of {@link ILoggerFactory} which always returns
35 * {@link SimpleLogger} instances.
36 *
37 * @author Ceki Gülcü
38 */
39public class SimpleLoggerFactory implements ILoggerFactory {
40
41    ConcurrentMap<String, Logger> loggerMap;
42
43    public SimpleLoggerFactory() {
44        loggerMap = new ConcurrentHashMap<String, Logger>();
45    }
46
47    /**
48     * Return an appropriate {@link SimpleLogger} instance by name.
49     */
50    public Logger getLogger(String name) {
51        Logger simpleLogger = loggerMap.get(name);
52        if (simpleLogger != null) {
53            return simpleLogger;
54        } else {
55            Logger newInstance = new SimpleLogger(name);
56            Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
57            return oldInstance == null ? newInstance : oldInstance;
58        }
59    }
60
61    /**
62     * Clear the internal logger cache.
63     *
64     * This method is intended to be called by classes (in the same package) for
65     * testing purposes. This method is internal. It can be modified, renamed or
66     * removed at any time without notice.
67     *
68     * You are strongly discouraged from calling this method in production code.
69     */
70    void reset() {
71        loggerMap.clear();
72    }
73}
74