1 /*
2 * Copyright 2012 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. 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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package com.foxinmy.weixin4j.logging;
17
18 /**
19 * Creates an {@link InternalLogger} or changes the default factory
20 * implementation. This factory allows you to choose what logging framework
21 * Netty should use. The default factory is {@link Slf4JLoggerFactory}. If SLF4J
22 * is not available, {@link JdkLoggerFactory} is used. You can change it to your
23 * preferred logging framework before other Netty classes are loaded:
24 *
25 * <pre>
26 * {@link InternalLoggerFactory}.setDefaultFactory(new {@link Log4JLoggerFactory}());
27 * </pre>
28 *
29 * Please note that the new default factory is effective only for the classes
30 * which were loaded after the default factory is changed. Therefore,
31 * {@link #setDefaultFactory(InternalLoggerFactory)} should be called as early
32 * as possible and shouldn't be called more than once.
33 */
34 public abstract class InternalLoggerFactory {
35 private static volatile InternalLoggerFactory defaultFactory = newDefaultFactory(InternalLoggerFactory.class
36 .getName());
37
38 private static InternalLoggerFactory newDefaultFactory(String name) {
39 InternalLoggerFactory f;
40 try {
41 f = new Slf4JLoggerFactory(true);
42 f.newInstance(name).debug(
43 "Using SLF4J as the default logging framework");
44 } catch (Throwable t1) {
45 f = new JdkLoggerFactory();
46 f.newInstance(name).debug(
47 "Using java.util.logging as the default logging framework");
48 }
49 return f;
50 }
51
52 /**
53 * Returns the default factory. The initial default factory is
54 * {@link JdkLoggerFactory}.
55 */
56 public static InternalLoggerFactory getDefaultFactory() {
57 return defaultFactory;
58 }
59
60 /**
61 * Changes the default factory.
62 */
63 public static void setDefaultFactory(InternalLoggerFactory defaultFactory) {
64 if (defaultFactory == null) {
65 throw new NullPointerException("defaultFactory");
66 }
67 InternalLoggerFactory.defaultFactory = defaultFactory;
68 }
69
70 /**
71 * Creates a new logger instance with the name of the specified class.
72 */
73 public static InternalLogger getInstance(Class<?> clazz) {
74 return getInstance(clazz.getName());
75 }
76
77 /**
78 * Creates a new logger instance with the specified name.
79 */
80 public static InternalLogger getInstance(String name) {
81 return getDefaultFactory().newInstance(name);
82 }
83
84 /**
85 * Creates a new logger instance with the specified name.
86 */
87 protected abstract InternalLogger newInstance(String name);
88 }