1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.File; 25 import java.lang.ref.WeakReference; 26 import java.net.URL; 27 import java.net.URLClassLoader; 28 import javax.naming.Context; 29 import javax.naming.InitialContext; 30 import javax.naming.NamingException; 31 import javax.naming.NoInitialContextException; 32 import javax.naming.spi.InitialContextFactory; 33 import javax.naming.spi.NamingManager; 34 import java.util.Hashtable; 35 36 public class DummyContextFactory implements InitialContextFactory { 37 static final String DUMMY_FACTORY = "DummyContextFactory"; 38 static final String DUMMY_FACTORY2 = "DummyContextFactory2"; 39 static final String MISSING_FACTORY = "NonExistant"; 40 static int counter = 0; 41 ClassLoader origContextLoader = Thread.currentThread().getContextClassLoader(); 42 43 public static void main(String[] s) throws Exception { 44 DummyContextFactory dcf = new DummyContextFactory(); 45 dcf.runTest(); 46 } 47 48 private void runTest() throws Exception { 49 final String classes = System.getProperty("url.dir", "."); 50 final URL curl = new File(classes).toURI().toURL(); 51 URLClassLoader testLoader = new URLClassLoader(new URL[] {curl}, null); 52 WeakReference<URLClassLoader> weakRef = new WeakReference<>(testLoader); 53 Thread.currentThread().setContextClassLoader(testLoader); 54 Hashtable<String, String> env = new Hashtable<>(); 55 env.put(Context.INITIAL_CONTEXT_FACTORY, DUMMY_FACTORY); 56 testContextCalls(env); 57 58 // now test with another factory 59 Thread.currentThread().setContextClassLoader(testLoader); 60 env.put(Context.INITIAL_CONTEXT_FACTORY, DUMMY_FACTORY2); 61 testContextCalls(env); 62 63 // one count is derived from a default constructor call (ignored for test) 64 // class associated with this ClassLoader should have 2 counts 65 if (counter != 2) { 66 throw new RuntimeException("wrong count: " + counter); 67 } 68 69 // a test for handling non-existent classes 70 env.put(Context.INITIAL_CONTEXT_FACTORY, MISSING_FACTORY); 71 testBadContextCall(env); 72 73 // test that loader gets GC'ed 74 testLoader = null; 75 System.gc(); 76 while (weakRef.get() != null) { 77 Thread.sleep(100); 78 System.gc(); 79 } 80 } 81 82 private void testContextCalls(Hashtable<String, String> env) throws Exception { 83 // the context is returned here but it's the ContextFactory that 84 // we're mainly interested in. Hence the counter test. 85 86 // 1st call populates the WeakHashMap 87 // Uses URLClassLoader 88 Context cxt = NamingManager.getInitialContext(env); 89 90 // 2nd call uses cached factory 91 cxt = NamingManager.getInitialContext(env); 92 93 Thread.currentThread().setContextClassLoader(origContextLoader); 94 95 // 3rd call uses new factory 96 // AppClassLoader 97 cxt = NamingManager.getInitialContext(env); 98 99 // test with null TCCL 100 // this shouldn't increase the count since a null TCCL 101 // means we default to System ClassLoader in this case (AppClassLoader) 102 Thread.currentThread().setContextClassLoader(null); 103 cxt = NamingManager.getInitialContext(env); 104 } 105 106 private void testBadContextCall(Hashtable<String, String> env) throws Exception { 107 try { 108 Context cxt = NamingManager.getInitialContext(env); 109 throw new RuntimeException("Expected NoInitialContextException"); 110 } catch (NoInitialContextException e) { 111 if (!(e.getCause() instanceof ClassNotFoundException)) { 112 throw new RuntimeException("unexpected cause", e.getCause()); 113 } 114 } 115 } 116 117 public DummyContextFactory() { 118 System.out.println("New DummyContextFactory " + (++counter)); 119 //new Throwable().printStackTrace(System.out); 120 } 121 122 @Override 123 public Context getInitialContext(Hashtable<?, ?> environment) throws NamingException { 124 return new DummyContext(environment); 125 } 126 127 public class DummyContext extends InitialContext { 128 129 private Hashtable<?, ?> env; 130 131 DummyContext(Hashtable<?, ?> env) throws NamingException { 132 this.env = env; 133 } 134 135 public Hashtable<?, ?> getEnvironment() { 136 return env; 137 } 138 } 139 }