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feat: add original InMemoryJavaCompiler

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金戟
2022-06-03 13:29:25 +08:00
parent b2a87bffbe
commit 3c11676408
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10
testable-core/src/main/java/com/alibaba/testable/core/compile/CompilationException.java Normal file
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package com.alibaba.testable.core.compile;
public class CompilationException extends RuntimeException {
private static final long serialVersionUID = 5272588827551900536L;
public CompilationException(String msg) {
super(msg);
}
}

33
testable-core/src/main/java/com/alibaba/testable/core/compile/CompiledCode.java Normal file
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package com.alibaba.testable.core.compile;
import javax.tools.SimpleJavaFileObject;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URI;
/**
* Created by trung on 5/3/15.
*/
public class CompiledCode extends SimpleJavaFileObject {
private ByteArrayOutputStream baos = new ByteArrayOutputStream();
private String className;
public CompiledCode(String className) throws Exception {
super(new URI(className), Kind.CLASS);
this.className = className;
}
public String getClassName() {
return className;
}
@Override
public OutputStream openOutputStream() throws IOException {
return baos;
}
public byte[] getByteCode() {
return baos.toByteArray();
}
}

27
testable-core/src/main/java/com/alibaba/testable/core/compile/DynamicClassLoader.java Normal file
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package com.alibaba.testable.core.compile;
import java.util.HashMap;
import java.util.Map;
public class DynamicClassLoader extends ClassLoader {
private Map<String, CompiledCode> customCompiledCode = new HashMap<>();
public DynamicClassLoader(ClassLoader parent) {
super(parent);
}
public void addCode(CompiledCode cc) {
customCompiledCode.put(cc.getName(), cc);
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
CompiledCode cc = customCompiledCode.get(name);
if (cc == null) {
return super.findClass(name);
}
byte[] byteCode = cc.getByteCode();
return defineClass(name, byteCode, 0, byteCode.length);
}
}

56
testable-core/src/main/java/com/alibaba/testable/core/compile/ExtendedStandardJavaFileManager.java Normal file
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package com.alibaba.testable.core.compile;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.tools.FileObject;
import javax.tools.ForwardingJavaFileManager;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
/**
* Created by trung on 5/3/15. Edited by turpid-monkey on 9/25/15, completed
* support for multiple compile units.
*/
public class ExtendedStandardJavaFileManager extends
ForwardingJavaFileManager<JavaFileManager> {
private List<CompiledCode> compiledCode = new ArrayList<CompiledCode>();
private DynamicClassLoader cl;
/**
* Creates a new instance of ForwardingJavaFileManager.
*
* @param fileManager
* delegate to this file manager
* @param cl
*/
protected ExtendedStandardJavaFileManager(JavaFileManager fileManager,
DynamicClassLoader cl) {
super(fileManager);
this.cl = cl;
}
@Override
public JavaFileObject getJavaFileForOutput(
JavaFileManager.Location location, String className,
JavaFileObject.Kind kind, FileObject sibling) throws IOException {
try {
CompiledCode innerClass = new CompiledCode(className);
compiledCode.add(innerClass);
cl.addCode(innerClass);
return innerClass;
} catch (Exception e) {
throw new RuntimeException(
"Error while creating in-memory output file for "
+ className, e);
}
}
@Override
public ClassLoader getClassLoader(JavaFileManager.Location location) {
return cl;
}
}

142
testable-core/src/main/java/com/alibaba/testable/core/compile/InMemoryJavaCompiler.java Normal file
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package com.alibaba.testable.core.compile;
import java.util.*;
import javax.tools.*;
/**
* Compile Java sources in-memory
*/
public class InMemoryJavaCompiler {
private JavaCompiler javac;
private DynamicClassLoader classLoader;
private Iterable<String> options;
boolean ignoreWarnings = false;
private Map<String, SourceCode> sourceCodes = new HashMap<String, SourceCode>();
public static InMemoryJavaCompiler newInstance() {
return new InMemoryJavaCompiler();
}
private InMemoryJavaCompiler() {
this.javac = ToolProvider.getSystemJavaCompiler();
this.classLoader = new DynamicClassLoader(ClassLoader.getSystemClassLoader());
}
public InMemoryJavaCompiler useParentClassLoader(ClassLoader parent) {
this.classLoader = new DynamicClassLoader(parent);
return this;
}
/**
* @return the class loader used internally by the compiler
*/
public ClassLoader getClassloader() {
return classLoader;
}
/**
* Options used by the compiler, e.g. '-Xlint:unchecked'.
*
* @param options
* @return
*/
public InMemoryJavaCompiler useOptions(String... options) {
this.options = Arrays.asList(options);
return this;
}
/**
* Ignore non-critical compiler output, like unchecked/unsafe operation
* warnings.
*
* @return
*/
public InMemoryJavaCompiler ignoreWarnings() {
ignoreWarnings = true;
return this;
}
/**
* Compile all sources
*
* @return Map containing instances of all compiled classes
* @throws Exception
*/
public Map<String, Class<?>> compileAll() throws Exception {
if (sourceCodes.size() == 0) {
throw new CompilationException("No source code to compile");
}
Collection<SourceCode> compilationUnits = sourceCodes.values();
CompiledCode[] code;
code = new CompiledCode[compilationUnits.size()];
Iterator<SourceCode> iter = compilationUnits.iterator();
for (int i = 0; i < code.length; i++) {
code[i] = new CompiledCode(iter.next().getClassName());
}
DiagnosticCollector<JavaFileObject> collector = new DiagnosticCollector<>();
ExtendedStandardJavaFileManager fileManager = new ExtendedStandardJavaFileManager(javac.getStandardFileManager(null, null, null), classLoader);
JavaCompiler.CompilationTask task = javac.getTask(null, fileManager, collector, options, null, compilationUnits);
boolean result = task.call();
if (!result || collector.getDiagnostics().size() > 0) {
StringBuffer exceptionMsg = new StringBuffer();
exceptionMsg.append("Unable to compile the source");
boolean hasWarnings = false;
boolean hasErrors = false;
for (Diagnostic<? extends JavaFileObject> d : collector.getDiagnostics()) {
switch (d.getKind()) {
case NOTE:
case MANDATORY_WARNING:
case WARNING:
hasWarnings = true;
break;
case OTHER:
case ERROR:
default:
hasErrors = true;
break;
}
exceptionMsg.append("\n").append("[kind=").append(d.getKind());
exceptionMsg.append(", ").append("line=").append(d.getLineNumber());
exceptionMsg.append(", ").append("message=").append(d.getMessage(Locale.US)).append("]");
}
if (hasWarnings && !ignoreWarnings || hasErrors) {
throw new CompilationException(exceptionMsg.toString());
}
}
Map<String, Class<?>> classes = new HashMap<String, Class<?>>();
for (String className : sourceCodes.keySet()) {
classes.put(className, classLoader.loadClass(className));
}
return classes;
}
/**
* Compile single source
*
* @param className
* @param sourceCode
* @return
* @throws Exception
*/
public Class<?> compile(String className, String sourceCode) throws Exception {
return addSource(className, sourceCode).compileAll().get(className);
}
/**
* Add source code to the compiler
*
* @param className
* @param sourceCode
* @return
* @throws Exception
* @see {@link #compileAll()}
*/
public InMemoryJavaCompiler addSource(String className, String sourceCode) throws Exception {
sourceCodes.put(className, new SourceCode(className, sourceCode));
return this;
}
}

201
testable-core/src/main/java/com/alibaba/testable/core/compile/LICENSE Normal file
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9
testable-core/src/main/java/com/alibaba/testable/core/compile/README.md Normal file
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This part of code is under [Apache License Version 2.0](LICENSE), modified from [InMemoryJavaCompiler](https://github.com/trung/InMemoryJavaCompiler) with several PRs merged and other refactorings (e.g. dropping unnecessary dependence and avoid throwing raw Exception).
Many thanks to the origin author and contributors of this lovely library:
- [trung](https://github.com/trung)
- [turpid-monkey](https://github.com/turpid-monkey)
- [PKeidel](https://github.com/PKeidel)
- [fossabot](https://github.com/fossabot)
- [KOLANICH](https://github.com/KOLANICH)
- [hammadirshad](https://github.com/hammadirshad)

29
testable-core/src/main/java/com/alibaba/testable/core/compile/SourceCode.java Normal file
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package com.alibaba.testable.core.compile;
import javax.tools.SimpleJavaFileObject;
import java.io.IOException;
import java.net.URI;
/**
* Created by trung on 5/3/15.
*/
public class SourceCode extends SimpleJavaFileObject {
private String contents = null;
private String className;
public SourceCode(String className, String contents) throws Exception {
super(URI.create("string:///" + className.replace('.', '/')
+ Kind.SOURCE.extension), Kind.SOURCE);
this.contents = contents;
this.className = className;
}
public String getClassName() {
return className;
}
public CharSequence getCharContent(boolean ignoreEncodingErrors)
throws IOException {
return contents;
}
}

109
testable-core/src/test/java/com/alibaba/testable/core/compile/InMemoryJavaCompilerTest.java Normal file
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package com.alibaba.testable.core.compile;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Map;
import static org.junit.jupiter.api.Assertions.*;
class InMemoryJavaCompilerTest {
@Test
public void compile_WhenTypical() throws Exception {
StringBuffer sourceCode = new StringBuffer();
sourceCode.append("package org.mdkt;\n");
sourceCode.append("public class HelloClass {\n");
sourceCode.append(" public String hello() { return \"hello\"; }");
sourceCode.append("}");
Class<?> helloClass = InMemoryJavaCompiler.newInstance().compile("org.mdkt.HelloClass", sourceCode.toString());
assertNotNull(helloClass);
assertEquals(1, helloClass.getDeclaredMethods().length);
}
@Test
public void compileAll_WhenTypical() throws Exception {
String cls1 = "public class A{ public B b() { return new B(); }}";
String cls2 = "public class B{ public String toString() { return \"B!\"; }}";
Map<String, Class<?>> compiled = com.alibaba.testable.core.compile.InMemoryJavaCompiler.newInstance().addSource("A", cls1).addSource("B", cls2).compileAll();
assertNotNull(compiled.get("A"));
assertNotNull(compiled.get("B"));
Class<?> aClass = compiled.get("A");
Object a = aClass.newInstance();
assertEquals("B!", aClass.getMethod("b").invoke(a).toString());
}
@Test
public void compile_WhenSourceContainsInnerClasses() throws Exception {
StringBuffer sourceCode = new StringBuffer();
sourceCode.append("package org.mdkt;\n");
sourceCode.append("public class HelloClass {\n");
sourceCode.append(" private static class InnerHelloWorld { int inner; }\n");
sourceCode.append(" public String hello() { return \"hello\"; }");
sourceCode.append("}");
Class<?> helloClass = com.alibaba.testable.core.compile.InMemoryJavaCompiler.newInstance().compile("org.mdkt.HelloClass", sourceCode.toString());
assertNotNull(helloClass);
assertEquals(1, helloClass.getDeclaredMethods().length);
}
@Test
public void compile_whenError() throws Exception {
thrown.expect(com.alibaba.testable.core.compile.CompilationException.class);
thrown.expectMessage("Unable to compile the source");
StringBuffer sourceCode = new StringBuffer();
sourceCode.append("package org.mdkt;\n");
sourceCode.append("public classHelloClass {\n");
sourceCode.append(" public String hello() { return \"hello\"; }");
sourceCode.append("}");
com.alibaba.testable.core.compile.InMemoryJavaCompiler.newInstance().compile("org.mdkt.HelloClass", sourceCode.toString());
}
@Test
public void compile_WhenFailOnWarnings() throws Exception {
thrown.expect(com.alibaba.testable.core.compile.CompilationException.class);
StringBuffer sourceCode = new StringBuffer();
sourceCode.append("package org.mdkt;\n");
sourceCode.append("public class HelloClass {\n");
sourceCode.append(" public java.util.List<String> hello() { return new java.util.ArrayList(); }");
sourceCode.append("}");
com.alibaba.testable.core.compile.InMemoryJavaCompiler.newInstance().compile("org.mdkt.HelloClass", sourceCode.toString());
}
@Test
public void compile_WhenIgnoreWarnings() throws Exception {
StringBuffer sourceCode = new StringBuffer();
sourceCode.append("package org.mdkt;\n");
sourceCode.append("public class HelloClass {\n");
sourceCode.append(" public java.util.List<String> hello() { return new java.util.ArrayList(); }");
sourceCode.append("}");
Class<?> helloClass = com.alibaba.testable.core.compile.InMemoryJavaCompiler.newInstance().ignoreWarnings().compile("org.mdkt.HelloClass", sourceCode.toString());
List<?> res = (List<?>) helloClass.getMethod("hello").invoke(helloClass.newInstance());
assertEquals(0, res.size());
}
@Test
public void compile_WhenWarningsAndErrors() throws Exception {
thrown.expect(CompilationException.class);
StringBuffer sourceCode = new StringBuffer();
sourceCode.append("package org.mdkt;\n");
sourceCode.append("public class HelloClass extends xxx {\n");
sourceCode.append(" public java.util.List<String> hello() { return new java.util.ArrayList(); }");
sourceCode.append("}");
try {
InMemoryJavaCompiler.newInstance().compile("org.mdkt.HelloClass", sourceCode.toString());
} catch (Exception e) {
throw e;
}
}
}