Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
Slf4jLogFactory |
|
| 6.5;6.5 |
1 | /* | |
2 | * #%L | |
3 | * Slf4jLogFactory.java - mongodb-async-driver - Allanbank Consulting, Inc. | |
4 | * %% | |
5 | * Copyright (C) 2011 - 2014 Allanbank Consulting, Inc. | |
6 | * %% | |
7 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
8 | * you may not use this file except in compliance with the License. | |
9 | * You may obtain a copy of the License at | |
10 | * | |
11 | * http://www.apache.org/licenses/LICENSE-2.0 | |
12 | * | |
13 | * Unless required by applicable law or agreed to in writing, software | |
14 | * distributed under the License is distributed on an "AS IS" BASIS, | |
15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
16 | * See the License for the specific language governing permissions and | |
17 | * limitations under the License. | |
18 | * #L% | |
19 | */ | |
20 | package com.allanbank.mongodb.util.log; | |
21 | ||
22 | import java.lang.reflect.InvocationTargetException; | |
23 | import java.lang.reflect.Method; | |
24 | import java.util.logging.Level; | |
25 | import java.util.logging.Logger; | |
26 | ||
27 | /** | |
28 | * Slf4jLogFactory provides factory to create {@link Slf4jLog} instances. | |
29 | * | |
30 | * @api.no This class is <b>NOT</b> part of the drivers API. This class may be | |
31 | * mutated in incompatible ways between any two releases of the driver. | |
32 | * @copyright 2014, Allanbank Consulting, Inc., All Rights Reserved | |
33 | */ | |
34 | public class Slf4jLogFactory extends LogFactory { | |
35 | /** The <code>LocationAwareLogger</code> class. */ | |
36 | private final Class<?> myLocationAwareLoggerClass; | |
37 | ||
38 | /** | |
39 | * The <code>getLogger(Class)</code> method from the | |
40 | * <code>LoggerFactory</code> interface. | |
41 | */ | |
42 | private final Method myLogFactoryMethod; | |
43 | ||
44 | /** | |
45 | * The <code>log(Marker, String, int, String, Object[])</code> method from | |
46 | * the <code>LocationAwareLogger</code> interface. | |
47 | */ | |
48 | private final Method myLogMethod; | |
49 | ||
50 | /** | |
51 | * Creates a new Slf4jLogFactory. | |
52 | * | |
53 | * @throws RuntimeException | |
54 | * On a failure to find the SLF4J Logger. | |
55 | */ | |
56 | 23 | public Slf4jLogFactory() throws RuntimeException { |
57 | Class<?> logFactoryClass; | |
58 | try { | |
59 | 23 | logFactoryClass = Class.forName("org.slf4j.LoggerFactory"); |
60 | } | |
61 | 2 | catch (final ClassNotFoundException e) { |
62 | // Don't log. SLF4J is not on the classpath to use. | |
63 | 2 | throw new RuntimeException(e); |
64 | 21 | } |
65 | ||
66 | try { | |
67 | 21 | myLogFactoryMethod = logFactoryClass.getMethod("getLogger", |
68 | Class.class); | |
69 | ||
70 | 21 | myLocationAwareLoggerClass = Class |
71 | .forName("org.slf4j.spi.LocationAwareLogger"); | |
72 | 21 | final Class<?> markerClass = Class.forName("org.slf4j.Marker"); |
73 | 21 | myLogMethod = myLocationAwareLoggerClass.getMethod("log", |
74 | markerClass, String.class, int.class, String.class, | |
75 | Object[].class, Throwable.class); | |
76 | } | |
77 | 0 | catch (final ClassNotFoundException e) { |
78 | 0 | Logger.getLogger(Slf4jLogFactory.class.getName()).log( |
79 | Level.WARNING, | |
80 | "Failed bootstrap the SLF4J logger: " + e.getMessage(), e); | |
81 | 0 | throw new RuntimeException(e); |
82 | } | |
83 | 0 | catch (final NoSuchMethodException e) { |
84 | 0 | Logger.getLogger(Slf4jLogFactory.class.getName()).log( |
85 | Level.WARNING, | |
86 | "Failed bootstrap the SLF4J logger: " + e.getMessage(), e); | |
87 | 0 | throw new RuntimeException(e); |
88 | 21 | } |
89 | 21 | } |
90 | ||
91 | /** | |
92 | * {@inheritDoc} | |
93 | * <p> | |
94 | * Overridden to return a {@link Slf4jLog} instance if SLF4J LoggerFactory | |
95 | * returns a LocationAwareLogger instance. Otherwise a {@link JulLog} is | |
96 | * returned. | |
97 | * </p> | |
98 | */ | |
99 | @Override | |
100 | protected Log doGetLog(final Class<?> clazz) { | |
101 | 235 | Log log = null; |
102 | try { | |
103 | 235 | final Object logger = myLogFactoryMethod.invoke(null, clazz); |
104 | 235 | if (myLocationAwareLoggerClass.isInstance(logger)) { |
105 | 235 | log = new Slf4jLog(myLogMethod, logger); |
106 | } | |
107 | } | |
108 | 0 | catch (final IllegalAccessException e) { |
109 | // Fall through. | |
110 | } | |
111 | 0 | catch (final InvocationTargetException e) { |
112 | // Fall through. | |
113 | } | |
114 | 0 | catch (final RuntimeException e) { |
115 | // Fall through. | |
116 | 235 | } |
117 | ||
118 | // Fall back to JUL logging. | |
119 | 235 | if (log == null) { |
120 | 0 | Logger.getLogger(Slf4jLogFactory.class.getName()).warning( |
121 | "Falling back to the JUL logger."); | |
122 | 0 | log = new JulLog(clazz); |
123 | } | |
124 | ||
125 | 235 | return log; |
126 | } | |
127 | } |