1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | |
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19 | package org.apache.hadoop.util; |
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20 | |
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21 | import java.net.URL; |
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22 | import java.net.URLClassLoader; |
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23 | import java.util.HashMap; |
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24 | |
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25 | import org.apache.hadoop.conf.Configuration; |
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26 | import org.apache.hadoop.mapred.JobConf; |
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27 | import org.apache.hadoop.mapred.JobConfigurable; |
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28 | |
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29 | import junit.framework.TestCase; |
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30 | |
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31 | public class TestReflectionUtils extends TestCase { |
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32 | |
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33 | private static Class toConstruct[] = { String.class, TestReflectionUtils.class, HashMap.class }; |
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34 | private Throwable failure = null; |
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35 | |
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36 | public void setUp() { |
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37 | ReflectionUtils.clearCache(); |
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38 | } |
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39 | |
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40 | public void testCache() throws Exception { |
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41 | assertEquals(0, cacheSize()); |
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42 | doTestCache(); |
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43 | assertEquals(toConstruct.length, cacheSize()); |
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44 | ReflectionUtils.clearCache(); |
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45 | assertEquals(0, cacheSize()); |
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46 | } |
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47 | |
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48 | |
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49 | @SuppressWarnings("unchecked") |
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50 | private void doTestCache() { |
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51 | for (int i=0; i<toConstruct.length; i++) { |
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52 | Class cl = toConstruct[i]; |
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53 | Object x = ReflectionUtils.newInstance(cl, null); |
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54 | Object y = ReflectionUtils.newInstance(cl, null); |
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55 | assertEquals(cl, x.getClass()); |
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56 | assertEquals(cl, y.getClass()); |
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57 | } |
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58 | } |
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59 | |
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60 | public void testThreadSafe() throws Exception { |
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61 | Thread[] th = new Thread[32]; |
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62 | for (int i=0; i<th.length; i++) { |
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63 | th[i] = new Thread() { |
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64 | public void run() { |
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65 | try { |
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66 | doTestCache(); |
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67 | } catch (Throwable t) { |
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68 | failure = t; |
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69 | } |
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70 | } |
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71 | }; |
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72 | th[i].start(); |
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73 | } |
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74 | for (int i=0; i<th.length; i++) { |
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75 | th[i].join(); |
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76 | } |
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77 | if (failure != null) { |
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78 | failure.printStackTrace(); |
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79 | fail(failure.getMessage()); |
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80 | } |
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81 | } |
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82 | |
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83 | private int cacheSize() throws Exception { |
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84 | return ReflectionUtils.getCacheSize(); |
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85 | } |
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86 | |
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87 | public void testCantCreate() { |
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88 | try { |
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89 | ReflectionUtils.newInstance(NoDefaultCtor.class, null); |
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90 | fail("invalid call should fail"); |
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91 | } catch (RuntimeException rte) { |
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92 | assertEquals(NoSuchMethodException.class, rte.getCause().getClass()); |
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93 | } |
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94 | } |
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95 | |
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96 | @SuppressWarnings("unchecked") |
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97 | public void testCacheDoesntLeak() throws Exception { |
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98 | int iterations=9999; // very fast, but a bit less reliable - bigger numbers force GC |
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99 | for (int i=0; i<iterations; i++) { |
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100 | URLClassLoader loader = new URLClassLoader(new URL[0], getClass().getClassLoader()); |
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101 | Class cl = Class.forName("org.apache.hadoop.util.TestReflectionUtils$LoadedInChild", false, loader); |
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102 | Object o = ReflectionUtils.newInstance(cl, null); |
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103 | assertEquals(cl, o.getClass()); |
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104 | } |
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105 | System.gc(); |
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106 | assertTrue(cacheSize()+" too big", cacheSize()<iterations); |
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107 | } |
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108 | |
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109 | private static class LoadedInChild { |
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110 | } |
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111 | |
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112 | public static class NoDefaultCtor { |
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113 | public NoDefaultCtor(int x) {} |
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114 | } |
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115 | |
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116 | /** |
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117 | * This is to test backward compatibility of ReflectionUtils for |
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118 | * JobConfigurable objects. |
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119 | * This should be made deprecated along with the mapred package HADOOP-1230. |
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120 | * Should be removed when mapred package is removed. |
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121 | */ |
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122 | public void testSetConf() { |
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123 | JobConfigurableOb ob = new JobConfigurableOb(); |
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124 | ReflectionUtils.setConf(ob, new Configuration()); |
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125 | assertFalse(ob.configured); |
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126 | ReflectionUtils.setConf(ob, new JobConf()); |
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127 | assertTrue(ob.configured); |
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128 | } |
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129 | |
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130 | private static class JobConfigurableOb implements JobConfigurable { |
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131 | boolean configured; |
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132 | public void configure(JobConf job) { |
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133 | configured = true; |
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134 | } |
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135 | } |
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136 | } |
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