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NewClassLoaderRunner.java
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NewClassLoaderRunner.java
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package org.apache.maven.surefire.booter;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.maven.surefire.shared.utils.io.FileUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.internal.runners.model.ReflectiveCallable;
import org.junit.internal.runners.statements.ExpectException;
import org.junit.internal.runners.statements.Fail;
import org.junit.internal.runners.statements.RunAfters;
import org.junit.internal.runners.statements.RunBefores;
import org.junit.runner.notification.RunNotifier;
import org.junit.runners.BlockJUnit4ClassRunner;
import org.junit.runners.model.FrameworkMethod;
import org.junit.runners.model.InitializationError;
import org.junit.runners.model.Statement;
import org.junit.runners.model.TestClass;
import java.io.File;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import static java.io.File.pathSeparator;
/**
* JUnit runner testing methods in a separate class loader.
*
* @author Tibor Digana (tibor17)
* @since 2.19
*/
public class NewClassLoaderRunner
extends BlockJUnit4ClassRunner
{
private Class<?> cls;
public NewClassLoaderRunner( Class<?> clazz )
throws InitializationError
{
super( clazz );
}
@Override
protected void runChild( FrameworkMethod method, RunNotifier notifier )
{
ClassLoader backup = Thread.currentThread().getContextClassLoader();
try
{
TestClassLoader loader = new TestClassLoader();
Thread.currentThread().setContextClassLoader( loader );
cls = getFromTestClassLoader( getTestClass().getName(), loader );
method = new FrameworkMethod( cls.getMethod( method.getName() ) );
super.runChild( method, notifier );
}
catch ( NoSuchMethodException e )
{
throw new IllegalStateException( e );
}
finally
{
Thread.currentThread().setContextClassLoader( backup );
}
}
@Override
protected Statement methodBlock( FrameworkMethod method )
{
try
{
Object test = new ReflectiveCallable()
{
@Override
protected Object runReflectiveCall()
throws Throwable
{
return createTest();
}
}.run();
Statement statement = methodInvoker( method, test );
statement = possiblyExpectingExceptions( method, test, statement );
statement = withBefores( method, test, statement );
statement = withAfters( method, test, statement );
return statement;
}
catch ( Throwable e )
{
return new Fail( e );
}
}
@Override
@SuppressWarnings( "unchecked" )
protected Statement possiblyExpectingExceptions( FrameworkMethod method, Object test, Statement next )
{
try
{
Class<? extends Annotation> t =
(Class<? extends Annotation>) Thread.currentThread().getContextClassLoader().loadClass(
Test.class.getName() );
Annotation annotation = method.getAnnotation( t );
Class<? extends Throwable> exp =
(Class<? extends Throwable>) t.getMethod( "expected" ).invoke( annotation );
boolean isException = exp != null && !Test.None.class.getName().equals( exp.getName() );
return isException ? new ExpectException( next, exp ) : next;
}
catch ( Exception e )
{
throw new IllegalStateException( e );
}
}
@Override
@SuppressWarnings( "unchecked" )
protected Statement withBefores( FrameworkMethod method, Object target, Statement statement )
{
try
{
Class<? extends Annotation> before =
(Class<? extends Annotation>) Thread.currentThread().getContextClassLoader().loadClass(
Before.class.getName() );
List<FrameworkMethod> befores = new TestClass( target.getClass() ).getAnnotatedMethods( before );
return befores.isEmpty() ? statement : new RunBefores( statement, befores, target );
}
catch ( ClassNotFoundException e )
{
throw new IllegalStateException( e );
}
}
@Override
@SuppressWarnings( "unchecked" )
protected Statement withAfters( FrameworkMethod method, Object target, Statement statement )
{
try
{
Class<? extends Annotation> after =
(Class<? extends Annotation>) Thread.currentThread().getContextClassLoader().loadClass(
After.class.getName() );
List<FrameworkMethod> afters = new TestClass( target.getClass() ).getAnnotatedMethods( after );
return afters.isEmpty() ? statement : new RunAfters( statement, afters, target );
}
catch ( ClassNotFoundException e )
{
throw new IllegalStateException( e );
}
}
@Override
protected Object createTest()
throws Exception
{
return cls == null ? super.createTest() : cls.getConstructor().newInstance();
}
private static Class<?> getFromTestClassLoader( String clazz, TestClassLoader loader )
{
try
{
return Class.forName( clazz, true, loader );
}
catch ( ClassNotFoundException e )
{
throw new IllegalStateException( e );
}
}
private static class TestClassLoader
extends URLClassLoader
{
TestClassLoader()
{
super( toClassPath(), null );
}
/**
* Compliant with Java 9 or prior version of JRE.
*
* @return classpath
*/
private static URL[] toClassPath()
{
try
{
Collection<URL> cp = toPathList(); // if Maven run
if ( cp.isEmpty() )
{
// if IDE
cp = toPathList( System.getProperty( "java.class.path" ) );
}
return cp.toArray( new URL[cp.size()] );
}
catch ( IOException e )
{
e.printStackTrace();
return new URL[0];
}
}
private static Collection<URL> toPathList( String path ) throws MalformedURLException
{
Collection<URL> classPath = new HashSet<>();
for ( String file : path.split( pathSeparator ) )
{
classPath.add( new File( file ).toURI().toURL() );
}
return classPath;
}
private static Collection<URL> toPathList()
{
Collection<URL> classPath = new HashSet<>();
try
{
String[] files = FileUtils.fileRead( new File( "target/test-classpath/cp.txt" ), "UTF-8" )
.split( pathSeparator );
for ( String file : files )
{
File f = new File( file );
File dir = f.getParentFile();
classPath.add(
( dir.getName().equals( "target" ) ? new File( dir, "classes" ) : f ).toURI().toURL() );
}
classPath.add( new File( "target/classes" ).toURI().toURL() );
classPath.add( new File( "target/test-classes" ).toURI().toURL() );
}
catch ( IOException e )
{
e.printStackTrace();
// turn to java.class.path
classPath.clear();
}
return classPath;
}
}
}