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test/testlibrary/RedefineClassHelper.java@6cfec782c42c (annotated)

test/testlibrary/RedefineClassHelper.java

Thu, 26 Jul 2018 06:16:09 -0400

author

vaibhav

date

Thu, 26 Jul 2018 06:16:09 -0400

changeset 9421

6cfec782c42c

parent 8050

3e5e398431a8

permissions

-rw-r--r--

8189762: [TESTBUG] Create tests for JDK-8146115 container awareness and resource configuration
Summary: Created tests for the feature
Reviewed-by: mseledtsov

ctornqvi@8050	1	/*
ctornqvi@8050	2	* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
ctornqvi@8050	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ctornqvi@8050	4	*
ctornqvi@8050	5	* This code is free software; you can redistribute it and/or modify it
ctornqvi@8050	6	* under the terms of the GNU General Public License version 2 only, as
ctornqvi@8050	7	* published by the Free Software Foundation.
ctornqvi@8050	8	*
ctornqvi@8050	9	* This code is distributed in the hope that it will be useful, but WITHOUT
ctornqvi@8050	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ctornqvi@8050	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
ctornqvi@8050	12	* version 2 for more details (a copy is included in the LICENSE file that
ctornqvi@8050	13	* accompanied this code).
ctornqvi@8050	14	*
ctornqvi@8050	15	* You should have received a copy of the GNU General Public License version
ctornqvi@8050	16	* 2 along with this work; if not, write to the Free Software Foundation,
ctornqvi@8050	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ctornqvi@8050	18	*
ctornqvi@8050	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ctornqvi@8050	20	* or visit www.oracle.com if you need additional information or have any
ctornqvi@8050	21	* questions.
ctornqvi@8050	22	*/
ctornqvi@8050	23
ctornqvi@8050	24	import java.io.PrintWriter;
ctornqvi@8050	25	import java.lang.instrument.*;
ctornqvi@8050	26	import com.oracle.java.testlibrary.*;
ctornqvi@8050	27
ctornqvi@8050	28	/*
ctornqvi@8050	29	* Helper class to write tests that redefine classes.
ctornqvi@8050	30	* When main method is run, it will create a redefineagent.jar that can be used
ctornqvi@8050	31	* with the -javaagent option to support redefining classes in jtreg tests.
ctornqvi@8050	32	*
ctornqvi@8050	33	* See sample test in test/testlibrary_tests/RedefineClassTest.java
ctornqvi@8050	34	*/
ctornqvi@8050	35	public class RedefineClassHelper {
ctornqvi@8050	36
ctornqvi@8050	37	public static Instrumentation instrumentation;
ctornqvi@8050	38	public static void premain(String agentArgs, Instrumentation inst) {
ctornqvi@8050	39	instrumentation = inst;
ctornqvi@8050	40	}
ctornqvi@8050	41
ctornqvi@8050	42	/**
ctornqvi@8050	43	* Redefine a class
ctornqvi@8050	44	*
ctornqvi@8050	45	* @param clazz Class to redefine
ctornqvi@8050	46	* @param javacode String with the new java code for the class to be redefined
ctornqvi@8050	47	*/
ctornqvi@8050	48	public static void redefineClass(Class clazz, String javacode) throws Exception {
ctornqvi@8050	49	byte[] bytecode = InMemoryJavaCompiler.compile(clazz.getName(), javacode);
ctornqvi@8050	50	redefineClass(clazz, bytecode);
ctornqvi@8050	51	}
ctornqvi@8050	52
ctornqvi@8050	53	/**
ctornqvi@8050	54	* Redefine a class
ctornqvi@8050	55	*
ctornqvi@8050	56	* @param clazz Class to redefine
ctornqvi@8050	57	* @param bytecode byte[] with the new class
ctornqvi@8050	58	*/
ctornqvi@8050	59	public static void redefineClass(Class clazz, byte[] bytecode) throws Exception {
ctornqvi@8050	60	instrumentation.redefineClasses(new ClassDefinition(clazz, bytecode));
ctornqvi@8050	61	}
ctornqvi@8050	62
ctornqvi@8050	63	/**
ctornqvi@8050	64	* Main method to be invoked before test to create the redefineagent.jar
ctornqvi@8050	65	*/
ctornqvi@8050	66	public static void main(String[] args) throws Exception {
ctornqvi@8050	67	ClassFileInstaller.main("RedefineClassHelper");
ctornqvi@8050	68
ctornqvi@8050	69	PrintWriter pw = new PrintWriter("MANIFEST.MF");
ctornqvi@8050	70	pw.println("Premain-Class: RedefineClassHelper");
ctornqvi@8050	71	pw.println("Can-Redefine-Classes: true");
ctornqvi@8050	72	pw.close();
ctornqvi@8050	73
ctornqvi@8050	74	sun.tools.jar.Main jarTool = new sun.tools.jar.Main(System.out, System.err, "jar");
ctornqvi@8050	75	if (!jarTool.run(new String[] { "-cmf", "MANIFEST.MF", "redefineagent.jar", "RedefineClassHelper.class" })) {
ctornqvi@8050	76	throw new Exception("jar operation failed");
ctornqvi@8050	77	}
ctornqvi@8050	78	}
ctornqvi@8050	79	}