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8223260: NamingManager should cache InitialContextFactory
Reviewed-by: alanb, plevart, dfuchs
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/* | ||
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
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import java.io.File; | ||
import java.lang.ref.WeakReference; | ||
import java.net.URL; | ||
import java.net.URLClassLoader; | ||
import javax.naming.Context; | ||
import javax.naming.InitialContext; | ||
import javax.naming.NamingException; | ||
import javax.naming.NoInitialContextException; | ||
import javax.naming.spi.InitialContextFactory; | ||
import javax.naming.spi.NamingManager; | ||
import java.util.Hashtable; | ||
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public class DummyContextFactory implements InitialContextFactory { | ||
static final String DUMMY_FACTORY = "DummyContextFactory"; | ||
static final String DUMMY_FACTORY2 = "DummyContextFactory2"; | ||
static final String MISSING_FACTORY = "NonExistant"; | ||
static int counter = 0; | ||
ClassLoader origContextLoader = Thread.currentThread().getContextClassLoader(); | ||
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public static void main(String[] s) throws Exception { | ||
DummyContextFactory dcf = new DummyContextFactory(); | ||
dcf.runTest(); | ||
} | ||
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private void runTest() throws Exception { | ||
final String classes = System.getProperty("url.dir", "."); | ||
final URL curl = new File(classes).toURI().toURL(); | ||
URLClassLoader testLoader = new URLClassLoader(new URL[] {curl}, null); | ||
WeakReference<URLClassLoader> weakRef = new WeakReference<>(testLoader); | ||
Thread.currentThread().setContextClassLoader(testLoader); | ||
Hashtable<String, String> env = new Hashtable<>(); | ||
env.put(Context.INITIAL_CONTEXT_FACTORY, DUMMY_FACTORY); | ||
testContextCalls(env); | ||
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// now test with another factory | ||
Thread.currentThread().setContextClassLoader(testLoader); | ||
env.put(Context.INITIAL_CONTEXT_FACTORY, DUMMY_FACTORY2); | ||
testContextCalls(env); | ||
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// one count is derived from a default constructor call (ignored for test) | ||
// class associated with this ClassLoader should have 2 counts | ||
if (counter != 2) { | ||
throw new RuntimeException("wrong count: " + counter); | ||
} | ||
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// a test for handling non-existent classes | ||
env.put(Context.INITIAL_CONTEXT_FACTORY, MISSING_FACTORY); | ||
testBadContextCall(env); | ||
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// test that loader gets GC'ed | ||
testLoader = null; | ||
System.gc(); | ||
while (weakRef.get() != null) { | ||
Thread.sleep(100); | ||
System.gc(); | ||
} | ||
} | ||
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private void testContextCalls(Hashtable<String, String> env) throws Exception { | ||
// the context is returned here but it's the ContextFactory that | ||
// we're mainly interested in. Hence the counter test. | ||
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// 1st call populates the WeakHashMap | ||
// Uses URLClassLoader | ||
Context cxt = NamingManager.getInitialContext(env); | ||
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// 2nd call uses cached factory | ||
cxt = NamingManager.getInitialContext(env); | ||
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Thread.currentThread().setContextClassLoader(origContextLoader); | ||
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// 3rd call uses new factory | ||
// AppClassLoader | ||
cxt = NamingManager.getInitialContext(env); | ||
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// test with null TCCL | ||
// this shouldn't increase the count since a null TCCL | ||
// means we default to System ClassLoader in this case (AppClassLoader) | ||
Thread.currentThread().setContextClassLoader(null); | ||
cxt = NamingManager.getInitialContext(env); | ||
} | ||
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private void testBadContextCall(Hashtable<String, String> env) throws Exception { | ||
try { | ||
Context cxt = NamingManager.getInitialContext(env); | ||
throw new RuntimeException("Expected NoInitialContextException"); | ||
} catch (NoInitialContextException e) { | ||
if (!(e.getCause() instanceof ClassNotFoundException)) { | ||
throw new RuntimeException("unexpected cause", e.getCause()); | ||
} | ||
} | ||
} | ||
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public DummyContextFactory() { | ||
System.out.println("New DummyContextFactory " + (++counter)); | ||
//new Throwable().printStackTrace(System.out); | ||
} | ||
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@Override | ||
public Context getInitialContext(Hashtable<?, ?> environment) throws NamingException { | ||
return new DummyContext(environment); | ||
} | ||
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public class DummyContext extends InitialContext { | ||
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private Hashtable env; | ||
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DummyContext(Hashtable env) throws NamingException { | ||
this.env = env; | ||
} | ||
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public Hashtable getEnvironment() { | ||
return env; | ||
} | ||
} | ||
} |
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@@ -0,0 +1,55 @@ | ||
/* | ||
* Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. | ||
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
* | ||
* This code is free software; you can redistribute it and/or modify it | ||
* under the terms of the GNU General Public License version 2 only, as | ||
* published by the Free Software Foundation. | ||
* | ||
* This code is distributed in the hope that it will be useful, but WITHOUT | ||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
* version 2 for more details (a copy is included in the LICENSE file that | ||
* accompanied this code). | ||
* | ||
* You should have received a copy of the GNU General Public License version | ||
* 2 along with this work; if not, write to the Free Software Foundation, | ||
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
* | ||
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
* or visit www.oracle.com if you need additional information or have any | ||
* questions. | ||
*/ | ||
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import javax.naming.Context; | ||
import javax.naming.InitialContext; | ||
import javax.naming.NamingException; | ||
import javax.naming.spi.InitialContextFactory; | ||
import java.util.Hashtable; | ||
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public class DummyContextFactory2 implements InitialContextFactory { | ||
static int counter = 0; | ||
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public DummyContextFactory2() { | ||
System.out.println("New DummyContextFactory2 " + (++counter)); | ||
//new Throwable().printStackTrace(System.out); | ||
} | ||
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@Override | ||
public Context getInitialContext(Hashtable<?, ?> environment) throws NamingException { | ||
return new DummyContext(environment); | ||
} | ||
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public class DummyContext extends InitialContext { | ||
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private Hashtable env; | ||
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DummyContext(Hashtable env) throws NamingException { | ||
this.env = env; | ||
} | ||
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public Hashtable getEnvironment() { | ||
return env; | ||
} | ||
} | ||
} |
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