jarek/7015: overwrite java classes #7125
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#7015: enable to overwrite java classes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| /* | ||
| * Copyright 2018 TWO SIGMA OPEN SOURCE, LLC | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
| package com.twosigma.beakerx.javash; | ||
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|
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| import com.twosigma.beakerx.jvm.classloader.BeakerxUrlClassLoader; | ||
| import com.twosigma.beakerx.kernel.PathToJar; | ||
|
|
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| import java.net.URL; | ||
| import java.net.URLClassLoader; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
|
|
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| import static java.util.Collections.singletonList; | ||
|
|
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| public class JavaBeakerxUrlClassLoader extends URLClassLoader { | ||
|
|
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| private BeakerxUrlClassLoader beakerxUrlClassLoader; | ||
| private JavaInternalUrlClassLoader javaURLClassLoader; | ||
|
|
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| public JavaBeakerxUrlClassLoader(ClassLoader systemClassLoader, PathToJar pathToJar) { | ||
| super(new URL[0]); | ||
| beakerxUrlClassLoader = new BeakerxUrlClassLoader(this.getURLs(), systemClassLoader); | ||
| javaURLClassLoader = new JavaInternalUrlClassLoader(beakerxUrlClassLoader, new URL[0]); | ||
| javaURLClassLoader.addJar(pathToJar); | ||
| } | ||
|
|
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| public void addJar(PathToJar pathToJar) { | ||
| javaURLClassLoader.addJar(pathToJar); | ||
| } | ||
|
|
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| public void addInitJar(PathToJar pathToJar) { | ||
| beakerxUrlClassLoader.addJar(pathToJar); | ||
| } | ||
|
|
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| public void addInitPathToJars(List<PathToJar> paths) { | ||
| for (PathToJar dir : paths) { | ||
| addInitJar(dir); | ||
| } | ||
| } | ||
|
|
||
| public Class<?> loadClass(String name) throws ClassNotFoundException { | ||
| Class<?> aClass = null; | ||
| try { | ||
| aClass = javaURLClassLoader.loadClass(name); | ||
| } catch (Exception e) { | ||
| } | ||
| if (aClass != null) { | ||
| return aClass; | ||
| } | ||
| return beakerxUrlClassLoader.loadClass(name); | ||
| } | ||
|
|
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| public void resetClassloader() { | ||
| javaURLClassLoader = new JavaInternalUrlClassLoader(beakerxUrlClassLoader, javaURLClassLoader.getURLs()); | ||
| } | ||
|
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|
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| public JavaInternalUrlClassLoader getJavaURLClassLoader() { | ||
| return javaURLClassLoader; | ||
| } | ||
|
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| static class JavaInternalUrlClassLoader extends BeakerxUrlClassLoader { | ||
|
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| private static final List<String> excludedClasses = singletonList("slf4j"); | ||
|
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| private BeakerxUrlClassLoader external; | ||
|
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| public JavaInternalUrlClassLoader(BeakerxUrlClassLoader external, URL[] urls) { | ||
| super(urls, null); | ||
| this.external = external; | ||
| } | ||
|
|
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| public Class<?> loadClass(String name) throws ClassNotFoundException { | ||
| if (isNotInExcludedClasses(name)) { | ||
| Class<?> aClass = null; | ||
| try { | ||
| aClass = super.loadClass(name); | ||
| } catch (Exception e) { | ||
| } | ||
| if (aClass != null) { | ||
| return aClass; | ||
| } | ||
| } | ||
| return external.loadClass(name); | ||
| } | ||
|
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| private boolean isNotInExcludedClasses(String name) { | ||
| return excludedClasses.stream() | ||
| .filter(name::contains) | ||
| .collect(Collectors.toList()) | ||
| .isEmpty(); | ||
| } | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| { | ||
| "cells": [ | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "package hello;\n", | ||
| "public class Main {\n", | ||
| " public static void main(String args[]){\n", | ||
| " System.out.println(\"Hello\");\n", | ||
| " }\n", | ||
| "}" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "package hello;\n", | ||
| "Main.main(null);" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "package hello;\n", | ||
| "public class Main {\n", | ||
| " public static void main(String args[]){\n", | ||
| " System.out.println(\"Hello world\");\n", | ||
| " }\n", | ||
| "}" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [ | ||
| "package hello;\n", | ||
| "Main.main(null);" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "code", | ||
| "execution_count": null, | ||
| "metadata": {}, | ||
| "outputs": [], | ||
| "source": [] | ||
| } | ||
| ], | ||
| "metadata": { | ||
| "kernelspec": { | ||
| "display_name": "Java", | ||
| "language": "java", | ||
| "name": "java" | ||
| }, | ||
| "language_info": { | ||
| "codemirror_mode": "text/x-java", | ||
| "file_extension": ".java", | ||
| "mimetype": "", | ||
| "name": "Java", | ||
| "nbconverter_exporter": "", | ||
| "version": "1.8.0_121" | ||
| } | ||
| }, | ||
| "nbformat": 4, | ||
| "nbformat_minor": 2 | ||
| } |
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Beakerx => BeakerX