From d5ea6843af8ca063f56d5356b5e29156c25f035e Mon Sep 17 00:00:00 2001
From: chibash <chiba@javassist.org>
Date: Sun, 16 Apr 2017 23:42:05 +0900
Subject: [PATCH] adds javassist.util.HotSwapAgent

---
 javassist.jar                             | Bin 724114 -> 727942 bytes
 src/main/javassist/util/HotSwapAgent.java | 223 ++++++++++++++++++++++
 src/main/javassist/util/HotSwapper.java   |   5 +
 src/test/javassist/HotswapTest.java       |  34 ++++
 src/test/javassist/JvstTest.java          |   1 +
 src/test/javassist/JvstTest2.java         |   1 -
 6 files changed, 263 insertions(+), 1 deletion(-)
 create mode 100644 src/main/javassist/util/HotSwapAgent.java
 create mode 100644 src/test/javassist/HotswapTest.java

diff --git a/javassist.jar b/javassist.jar
index 8d9c19822ef33ed873a0faffce8c4d600a06b27b..ce389bac6f9b947af41a33bc85994782df48d73d 100644
GIT binary patch
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diff --git a/src/main/javassist/util/HotSwapAgent.java b/src/main/javassist/util/HotSwapAgent.java
new file mode 100644
index 00000000..5bfbe53c
--- /dev/null
+++ b/src/main/javassist/util/HotSwapAgent.java
@@ -0,0 +1,223 @@
+/*
+ * Javassist, a Java-bytecode translator toolkit.
+ * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License.  Alternatively, the contents of this file may be used under
+ * the terms of the GNU Lesser General Public License Version 2.1 or later,
+ * or the Apache License Version 2.0.
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ */
+package javassist.util;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.lang.instrument.ClassDefinition;
+import java.lang.instrument.Instrumentation;
+import java.lang.instrument.UnmodifiableClassException;
+import java.util.jar.Attributes;
+import java.util.jar.JarEntry;
+import java.util.jar.JarOutputStream;
+import java.util.jar.Manifest;
+import java.lang.management.ManagementFactory;
+import com.sun.tools.attach.VirtualMachine;
+
+import javassist.CannotCompileException;
+import javassist.ClassPool;
+import javassist.CtClass;
+import javassist.NotFoundException;
+
+/**
+ * A utility class for dynamically adding a new method
+ * or modifying an existing method body.
+ * This class provides {@link #redefine(Class, CtClass)}
+ * and {@link #redefine(Class[], CtClass[])}, which replace the
+ * existing class definition with a new one.
+ * These methods perform the replacement by
+ * {@code java.lang.instrument.Instrumentation}.  For details
+ * of acceptable modification,
+ * see the {@code Instrumentation} interface.
+ *
+ * <p>Before calling the {@code redefine} methods, the hotswap agent
+ * has to be deployed.</p>
+ *
+ * <p>To create a hotswap agent, run {@link #createAgentJarFile(String)}.
+ * For example, the following command creates an agent file named {@code hotswap.jar}.
+ *
+ * <pre>
+ * $ jshell --class-path javassist.jar
+ * jshell> javassist.util.HotSwapAgent.createAgentJarFile("hotswap.jar") 
+ * </pre>
+ *
+ * <p>Then, run the JVM with the VM argument {@code -javaagent:hotswap.jar}
+ * to deploy the hotswap agent.
+ * </p>
+ *
+ * <p>If the {@code -javaagent} option is not given to the JVM, {@code HotSwapAgent}
+ * attempts to automatically create and start the hotswap agent on demand.
+ * This automated deployment may fail.  If it fails, manually create the hotswap agent
+ * and deploy it by {@code -javaagent}.</p>
+ *
+ * <p>The {@code HotSwapAgent} requires {@code tools.jar} as well as {@code javassist.jar}.</p>
+ * 
+ * <p>The idea of this class was given by <a href="https://github.com/alugowski">Adam Lugowski</a>.
+ * Shigeru Chiba wrote this class by referring
+ * to his <a href="https://github.com/turn/RedefineClassAgent">{@code RedefineClassAgent}</a>.
+ * For details, see <a href="https://github.com/jboss-javassist/javassist/issues/119">this discussion</a>. 
+ * </p>
+ *
+ * @see #redefine(Class, CtClass)
+ * @see #redefine(Class[], CtClass[])
+ * @since 3.22
+ */
+public class HotSwapAgent {
+    private static Instrumentation instrumentation = null;
+
+    /**
+     * Obtains the {@code Instrumentation} object.
+     *
+     * @return null             when it is not available. 
+     */
+    public Instrumentation instrumentation() { return instrumentation; }
+
+    /**
+     * The entry point invoked when this agent is started by {@code -javaagent}. 
+     */
+    public static void premain(String agentArgs, Instrumentation inst) throws Throwable {
+        agentmain(agentArgs, inst);
+    }
+
+    /**
+     * The entry point invoked when this agent is started after the JVM starts.
+     */
+    public static void agentmain(String agentArgs, Instrumentation inst) throws Throwable {
+        if (!inst.isRedefineClassesSupported())
+            throw new RuntimeException("this JVM does not support redefinition of classes");
+
+        instrumentation = inst;
+    }
+
+    /**
+     * Redefines a class.
+     */
+    public static void redefine(Class oldClass, CtClass newClass)
+        throws NotFoundException, IOException, CannotCompileException
+    {
+        Class[] old = { oldClass };
+        CtClass[] newClasses = { newClass };
+        redefine(old, newClasses);
+    }
+
+    /**
+     * Redefines classes.
+     */
+    public static void redefine(Class[] oldClasses, CtClass[] newClasses)
+        throws NotFoundException, IOException, CannotCompileException
+    {
+        startAgent();
+        ClassDefinition[] defs = new ClassDefinition[oldClasses.length];
+        for (int i = 0; i < oldClasses.length; i++)
+            defs[i] = new ClassDefinition(oldClasses[i], newClasses[i].toBytecode());
+
+        try {
+            instrumentation.redefineClasses(defs);
+        }
+        catch (ClassNotFoundException e) {
+            throw new NotFoundException(e.getMessage(), e);
+        }
+        catch (UnmodifiableClassException e) {
+            throw new CannotCompileException(e.getMessage(), e);
+        }
+    }
+
+    /**
+     * Ensures that the agent is ready.
+     * It attempts to dynamically start the agent if necessary.
+     */
+    private static void startAgent() throws NotFoundException {
+        if (instrumentation != null)
+            return;
+
+        try {
+            File agentJar = createJarFile();
+
+            String nameOfRunningVM = ManagementFactory.getRuntimeMXBean().getName();
+            String pid = nameOfRunningVM.substring(0, nameOfRunningVM.indexOf('@'));
+
+            VirtualMachine vm = VirtualMachine.attach(pid);
+            vm.loadAgent(agentJar.getAbsolutePath(), "");
+            vm.detach();
+        }
+        catch (Exception e) {
+            throw new NotFoundException("hotswap agent", e);
+        }
+
+        for (int sec = 0; sec < 10 /* sec */; sec++) {
+            if (instrumentation != null)
+                return;
+
+            try {
+                Thread.sleep(1000);
+            }
+            catch (InterruptedException e) {
+                Thread.currentThread().interrupt();
+                break;
+            }
+        }
+
+        throw new NotFoundException("hotswap agent (timeout)");
+    }
+
+    /**
+     * Creates an agent file for using {@code HotSwapAgent}. 
+     */
+    public static File createAgentJarFile(String fileName)
+        throws IOException, CannotCompileException, NotFoundException
+    {
+        return createJarFile(new File(fileName));
+    }
+
+    private static File createJarFile()
+        throws IOException, CannotCompileException, NotFoundException
+    {
+        File jar = File.createTempFile("agent", ".jar");
+        jar.deleteOnExit();
+        return createJarFile(jar);
+    }
+
+    private static File createJarFile(File jar)
+        throws IOException, CannotCompileException, NotFoundException
+    {
+        Manifest manifest = new Manifest();
+        Attributes attrs = manifest.getMainAttributes();
+        attrs.put(Attributes.Name.MANIFEST_VERSION, "1.0");
+        attrs.put(new Attributes.Name("Premain-Class"), HotSwapAgent.class.getName());
+        attrs.put(new Attributes.Name("Agent-Class"), HotSwapAgent.class.getName());
+        attrs.put(new Attributes.Name("Can-Retransform-Classes"), "true");
+        attrs.put(new Attributes.Name("Can-Redefine-Classes"), "true");
+
+        JarOutputStream jos = null;
+        try {
+            jos = new JarOutputStream(new FileOutputStream(jar), manifest);
+            String cname = HotSwapAgent.class.getName();
+            JarEntry e = new JarEntry(cname.replace('.', '/') + ".class");
+            jos.putNextEntry(e);
+            ClassPool pool = ClassPool.getDefault();
+            CtClass clazz = pool.get(cname);
+            jos.write(clazz.toBytecode());
+            jos.closeEntry();
+        }
+        finally {
+            if (jos != null)
+                jos.close();
+        }
+
+        return jar;
+    }
+}
diff --git a/src/main/javassist/util/HotSwapper.java b/src/main/javassist/util/HotSwapper.java
index 9028f2aa..f47c3285 100644
--- a/src/main/javassist/util/HotSwapper.java
+++ b/src/main/javassist/util/HotSwapper.java
@@ -70,7 +70,12 @@ class Trigger {
  * repatedly call <code>reload()</code> on the same <code>HotSwapper</code>
  * object so that they can reload a number of classes.
  *
+ * <p>{@code HotSwap} depends on the debug agent to perform hot-swapping
+ * but it is reported that the debug agent is buggy under massively multithreaded
+ * environments.  If you encounter a problem, try {@link HotSwapAgent}.
+ *
  * @since 3.1
+ * @see HotSwapAgent
  */
 public class HotSwapper {
     private VirtualMachine jvm;
diff --git a/src/test/javassist/HotswapTest.java b/src/test/javassist/HotswapTest.java
new file mode 100644
index 00000000..8b4db598
--- /dev/null
+++ b/src/test/javassist/HotswapTest.java
@@ -0,0 +1,34 @@
+package javassist;
+
+import javassist.util.HotSwapAgent;
+import junit.framework.TestCase;
+
+public class HotswapTest extends TestCase {
+    public static void main(String[] args) throws Exception {
+        // run java -javaagent:hotswap.jar javassist.HotswapTest
+        new HotswapTest(HotswapTest.class.getName()).testHotswap();
+    }
+
+    public HotswapTest(String name) {
+        super(name);
+    }
+
+    public static class Foo {
+        public int foo() { return 1; }
+    }
+
+    public void testHotswap() throws Exception {
+        Foo f = new Foo();
+        assertEquals(1, f.foo());
+
+        ClassPool cp = ClassPool.getDefault();
+        CtClass clazz = cp.get(Foo.class.getName());
+        CtMethod m = clazz.getDeclaredMethod("foo");
+        clazz.removeMethod(m);
+        clazz.addMethod(CtNewMethod.make("public int foo() { return 2; }", clazz));
+        HotSwapAgent.redefine(Foo.class, clazz);
+        Foo g = new Foo();
+        assertEquals(2, g.foo());
+        System.out.println("Foo#foo() = " + g.foo());
+    }
+}
diff --git a/src/test/javassist/JvstTest.java b/src/test/javassist/JvstTest.java
index 550d4278..d660a335 100644
--- a/src/test/javassist/JvstTest.java
+++ b/src/test/javassist/JvstTest.java
@@ -1124,6 +1124,7 @@ public class JvstTest extends JvstTestRoot {
         suite.addTestSuite(testproxy.ProxyFactoryPerformanceTest.class); // remove?
         suite.addTestSuite(javassist.proxyfactory.ProxyFactoryTest.class);
         suite.addTestSuite(javassist.proxyfactory.Tester.class);
+        suite.addTestSuite(javassist.HotswapTest.class);
         suite.addTestSuite(test.javassist.proxy.ProxySerializationTest.class);
         suite.addTestSuite(test.javassist.convert.ArrayAccessReplaceTest.class);
         suite.addTestSuite(test.javassist.proxy.JASSIST113RegressionTest.class);
diff --git a/src/test/javassist/JvstTest2.java b/src/test/javassist/JvstTest2.java
index 443bbb30..ec314e12 100644
--- a/src/test/javassist/JvstTest2.java
+++ b/src/test/javassist/JvstTest2.java
@@ -4,7 +4,6 @@ import java.io.*;
 import java.net.URL;
 import java.lang.reflect.Method;
 
-import javassist.bytecode.ClassFile;
 import javassist.expr.*;
 
 public class JvstTest2 extends JvstTestRoot {
-- 
2.39.5