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/*
* Copyright (c) 2006-2013 Rogério Liesenfeld
* This file is subject to the terms of the MIT license (see LICENSE.txt).
*/
package mockit.internal.startup;
import java.io.*;
import java.lang.instrument.*;
import java.util.logging.*;
import org.jetbrains.annotations.*;
import mockit.*;
import mockit.internal.mockups.*;
import mockit.internal.expectations.transformation.*;
import mockit.internal.state.*;
import mockit.internal.util.*;
/**
* This is the "agent class" that initializes the JMockit "Java agent". It is not intended for use in client code.
* It must be public, however, so the JVM can call the {@code premain} method, which as the name implies is called
* before the {@code main} method.
*
* @see #premain(String, Instrumentation)
*/
public final class Startup
{
static final String javaSpecVersion = System.getProperty("java.specification.version");
static final boolean jdk6OrLater =
"1.6".equals(javaSpecVersion) || "1.7".equals(javaSpecVersion) || "1.8".equals(javaSpecVersion);
public static boolean initializing;
private static Instrumentation instrumentation;
private static boolean initializedOnDemand;
private Startup() {}
public static boolean isJava6OrLater() { return jdk6OrLater; }
/**
* This method must only be called by the JVM, to provide the instrumentation object.
* In order for this to occur, the JVM must be started with "-javaagent:jmockit.jar" as a command line parameter
* (assuming the jar file is in the current directory).
*
* It is also possible to load other instrumentation tools at this time, by having set the "jmockit-tools"
* and/or "jmockit-mocks" system properties in the JVM command line.
* There are two types of instrumentation tools:
*
*
A {@link ClassFileTransformer class file transformer}, which will be instantiated and added to the JVM
* instrumentation service. Such a class must have a no-args constructor.
*
An external mock, which should be a {@code MockUp} subclass with a no-args constructor.
*
*
* @param agentArgs not used
* @param inst the instrumentation service provided by the JVM
*/
public static void premain(String agentArgs, Instrumentation inst) throws IOException
{
initialize(true, inst);
}
private static void initialize(boolean initializeTestNG, @NotNull Instrumentation inst) throws IOException
{
if (instrumentation == null) {
instrumentation = inst;
applyStartupMocks(initializeTestNG);
inst.addTransformer(CachedClassfiles.INSTANCE);
inst.addTransformer(new ExpectationsTransformer(inst));
}
}
private static void applyStartupMocks(boolean initializeTestNG) throws IOException
{
initializing = true;
try {
new JMockitInitialization().initialize(initializeTestNG);
}
finally {
initializing = false;
}
}
@SuppressWarnings("UnusedDeclaration")
public static void agentmain(String agentArgs, Instrumentation inst) throws IOException
{
initialize(false, inst);
ClassLoader customCL = (ClassLoader) System.getProperties().remove("jmockit-customCL");
if (customCL != null) {
reinitializeJMockitUnderCustomClassLoader(customCL);
}
}
private static void reinitializeJMockitUnderCustomClassLoader(@NotNull ClassLoader customLoader)
{
Class startupClass;
try {
startupClass = customLoader.loadClass(Startup.class.getName());
}
catch (ClassNotFoundException ignore) {
return;
}
replaceCustomLogManagerAsNeeded();
System.out.println("JMockit: Reinitializing under custom class loader " + customLoader);
FieldReflection.setField(startupClass, null, "instrumentation", instrumentation);
MethodReflection.invoke(startupClass, (Object) null, "reapplyStartupMocks");
}
private static void replaceCustomLogManagerAsNeeded()
{
final LogManager logManager = LogManager.getLogManager();
if (logManager.getClass() != LogManager.class) {
LogManager newLogManager = new LogManager() {
@Override
public boolean addLogger(Logger logger)
{
logManager.addLogger(logger);
return super.addLogger(logger);
}
@Override
public Logger getLogger(String name)
{
Logger logger = super.getLogger(name);
if (logger == null) logger = logManager.getLogger(name);
return logger;
}
};
FieldReflection.setField(LogManager.class, null, "manager", newLogManager);
}
}
private static void reapplyStartupMocks()
{
try { applyStartupMocks(false); } catch (IOException e) { throw new RuntimeException(e); }
}
@NotNull public static Instrumentation instrumentation()
{
verifyInitialization();
assert instrumentation != null;
return instrumentation;
}
public static void initialize(@NotNull Instrumentation inst, @NotNull Class>... mockUpClasses)
throws IOException
{
boolean fullJMockit = false;
try {
Class.forName("mockit.internal.expectations.transformation.ExpectationsTransformer");
fullJMockit = true;
}
catch (ClassNotFoundException ignored) {}
instrumentation = inst;
initializing = true;
try {
if (fullJMockit) new JMockitInitialization().initialize(true);
applyMockUpClasses(mockUpClasses);
}
finally {
initializing = false;
}
if (fullJMockit) {
inst.addTransformer(CachedClassfiles.INSTANCE);
inst.addTransformer(new ExpectationsTransformer(inst));
}
}
private static void applyMockUpClasses(@NotNull Class>[] mockUpClasses)
{
for (Class> mockUpClass : mockUpClasses) {
try {
new MockClassSetup(mockUpClass).redefineMethods();
}
catch (UnsupportedOperationException ignored) {}
catch (Throwable unexpectedFailure) {
StackTrace.filterStackTrace(unexpectedFailure);
unexpectedFailure.printStackTrace();
}
}
}
public static boolean wasInitializedOnDemand() { return initializedOnDemand; }
public static void verifyInitialization()
{
if (getInstrumentation() == null) {
initializedOnDemand = new AgentInitialization().initializeAccordingToJDKVersion();
if (initializedOnDemand) {
System.out.println(
"WARNING: JMockit was initialized on demand, which may cause certain tests to fail;\n" +
"please check the documentation for better ways to get it initialized.");
}
}
}
@Nullable private static Instrumentation getInstrumentation()
{
if (instrumentation == null) {
Class initialStartupClass =
ClassLoad.loadClass(ClassLoader.getSystemClassLoader(), Startup.class.getName());
if (initialStartupClass != null) {
instrumentation = FieldReflection.getField(initialStartupClass, "instrumentation", null);
if (instrumentation != null) {
reapplyStartupMocks();
}
}
}
return instrumentation;
}
public static boolean initializeIfPossible()
{
if (getInstrumentation() == null) {
if (jdk6OrLater) {
ClassLoader currentCL = Startup.class.getClassLoader();
if (currentCL != ClassLoader.getSystemClassLoader()) { // custom CL detected
System.getProperties().put("jmockit-customCL", currentCL);
}
}
try {
return new AgentInitialization().initializeAccordingToJDKVersion();
}
catch (RuntimeException e) {
e.printStackTrace(); // makes sure the exception gets printed at least once
throw e;
}
}
return false;
}
public static void redefineMethods(@NotNull Class classToRedefine, @NotNull byte[] modifiedClassfile)
{
redefineMethods(new ClassDefinition(classToRedefine, modifiedClassfile));
}
public static void redefineMethods(@NotNull ClassDefinition... classDefs)
{
CachedClassfiles.INSTANCE.setClassesBeingMocked(classDefs);
try {
instrumentation().redefineClasses(classDefs);
}
catch (ClassNotFoundException e) {
// should never happen
throw new RuntimeException(e);
}
catch (UnmodifiableClassException e) {
throw new RuntimeException(e);
}
catch (InternalError e) {
// If a class to be redefined hasn't been loaded yet, the JVM may get a NoClassDefFoundError during
// redefinition. Unfortunately, it then throws a plain InternalError instead.
for (ClassDefinition classDef : classDefs) {
detectMissingDependenciesIfAny(classDef.getDefinitionClass());
}
// If the above didn't throw upon detecting a NoClassDefFoundError, the original error is re-thrown.
throw e;
}
finally {
CachedClassfiles.INSTANCE.setClassesBeingMocked(null);
}
}
private static void detectMissingDependenciesIfAny(@NotNull Class mockedClass)
{
try {
Class.forName(mockedClass.getName(), true, mockedClass.getClassLoader());
}
catch (NoClassDefFoundError e) {
throw new RuntimeException("Unable to mock " + mockedClass + " due to a missing dependency", e);
}
catch (ClassNotFoundException ignore) {
// Shouldn't happen since the mocked class would already have been found in the classpath.
}
}
}
