1 /*
2 * Copyright 2001-2004 The Apache Software Foundation.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.apache.log4j;
18
19 import org.apache.log4j.spi.LoggerFactory;
20
21 import java.util.concurrent.ConcurrentHashMap;
22 import java.util.concurrent.ConcurrentMap;
23
24 /**
25 * This class is a factory that creates and maintains org.apache.log4j.Loggers
26 * wrapping org.slf4j.Loggers.
27 *
28 * It keeps a hashtable of all created org.apache.log4j.Logger instances so that
29 * all newly created instances are not duplicates of existing loggers.
30 *
31 * @author Sébastien Pennec
32 */
33 class Log4jLoggerFactory {
34
35 // String, Logger
36 private static final ConcurrentMap<String, Logger> log4jLoggers = new ConcurrentHashMap<>();
37
38 public static Logger getLogger(String name) {
39 org.apache.log4j.Logger instance = log4jLoggers.get(name);
40 if (instance != null) {
41 return instance;
42 } else {
43 Logger newInstance = new Logger(name);
44 Logger oldInstance = log4jLoggers.putIfAbsent(name, newInstance);
45 return oldInstance == null ? newInstance : oldInstance;
46 }
47 }
48
49 public static Logger getLogger(String name, LoggerFactory loggerFactory) {
50 org.apache.log4j.Logger instance = log4jLoggers.get(name);
51 if (instance != null) {
52 return instance;
53 } else {
54 Logger newInstance = loggerFactory.makeNewLoggerInstance(name);
55 Logger oldInstance = log4jLoggers.putIfAbsent(name, newInstance);
56 return oldInstance == null ? newInstance : oldInstance;
57 }
58 }
59 }