1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/rt/launcher/src/main/java/org/apidesign/bck2brwsr/launcher/JSLauncher.java Tue Feb 26 16:54:16 2013 +0100
1.3 @@ -0,0 +1,132 @@
1.4 +/**
1.5 + * Back 2 Browser Bytecode Translator
1.6 + * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 + *
1.8 + * This program is free software: you can redistribute it and/or modify
1.9 + * it under the terms of the GNU General Public License as published by
1.10 + * the Free Software Foundation, version 2 of the License.
1.11 + *
1.12 + * This program is distributed in the hope that it will be useful,
1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 + * GNU General Public License for more details.
1.16 + *
1.17 + * You should have received a copy of the GNU General Public License
1.18 + * along with this program. Look for COPYING file in the top folder.
1.19 + * If not, see http://opensource.org/licenses/GPL-2.0.
1.20 + */
1.21 +package org.apidesign.bck2brwsr.launcher;
1.22 +
1.23 +import org.apidesign.bck2brwsr.launcher.impl.Console;
1.24 +import java.io.IOException;
1.25 +import java.io.InputStream;
1.26 +import java.net.URL;
1.27 +import java.util.Enumeration;
1.28 +import java.util.LinkedHashSet;
1.29 +import java.util.Set;
1.30 +import java.util.logging.Level;
1.31 +import java.util.logging.Logger;
1.32 +import javax.script.Invocable;
1.33 +import javax.script.ScriptEngine;
1.34 +import javax.script.ScriptEngineManager;
1.35 +import javax.script.ScriptException;
1.36 +import org.apidesign.vm4brwsr.Bck2Brwsr;
1.37 +
1.38 +/**
1.39 + * Tests execution in Java's internal scripting engine.
1.40 + */
1.41 +final class JSLauncher extends Launcher {
1.42 + private static final Logger LOG = Logger.getLogger(JSLauncher.class.getName());
1.43 + private Set<ClassLoader> loaders = new LinkedHashSet<>();
1.44 + private final Res resources = new Res();
1.45 + private Invocable code;
1.46 + private StringBuilder codeSeq;
1.47 + private Object console;
1.48 +
1.49 +
1.50 + @Override InvocationContext runMethod(InvocationContext mi) {
1.51 + loaders.add(mi.clazz.getClassLoader());
1.52 + try {
1.53 + long time = System.currentTimeMillis();
1.54 + LOG.log(Level.FINE, "Invoking {0}.{1}", new Object[]{mi.clazz.getName(), mi.methodName});
1.55 + String res = code.invokeMethod(
1.56 + console,
1.57 + "invoke__Ljava_lang_String_2Ljava_lang_String_2Ljava_lang_String_2",
1.58 + mi.clazz.getName(), mi.methodName).toString();
1.59 + time = System.currentTimeMillis() - time;
1.60 + LOG.log(Level.FINE, "Resut of {0}.{1} = {2} in {3} ms", new Object[]{mi.clazz.getName(), mi.methodName, res, time});
1.61 + mi.result(res, null);
1.62 + } catch (ScriptException | NoSuchMethodException ex) {
1.63 + mi.result(null, ex);
1.64 + }
1.65 + return mi;
1.66 + }
1.67 +
1.68 + public void addClassLoader(ClassLoader url) {
1.69 + this.loaders.add(url);
1.70 + }
1.71 +
1.72 + @Override
1.73 + public void initialize() throws IOException {
1.74 + try {
1.75 + initRhino();
1.76 + } catch (Exception ex) {
1.77 + if (ex instanceof IOException) {
1.78 + throw (IOException)ex;
1.79 + }
1.80 + if (ex instanceof RuntimeException) {
1.81 + throw (RuntimeException)ex;
1.82 + }
1.83 + throw new IOException(ex);
1.84 + }
1.85 + }
1.86 +
1.87 + private void initRhino() throws IOException, ScriptException, NoSuchMethodException {
1.88 + StringBuilder sb = new StringBuilder();
1.89 + Bck2Brwsr.generate(sb, new Res());
1.90 +
1.91 + ScriptEngineManager sem = new ScriptEngineManager();
1.92 + ScriptEngine mach = sem.getEngineByExtension("js");
1.93 +
1.94 + sb.append(
1.95 + "\nvar vm = new bck2brwsr(org.apidesign.bck2brwsr.launcher.impl.Console.read);"
1.96 + + "\nfunction initVM() { return vm; };"
1.97 + + "\n");
1.98 +
1.99 + Object res = mach.eval(sb.toString());
1.100 + if (!(mach instanceof Invocable)) {
1.101 + throw new IOException("It is invocable object: " + res);
1.102 + }
1.103 + code = (Invocable) mach;
1.104 + codeSeq = sb;
1.105 +
1.106 + Object vm = code.invokeFunction("initVM");
1.107 + console = code.invokeMethod(vm, "loadClass", Console.class.getName());
1.108 + }
1.109 +
1.110 + @Override
1.111 + public void shutdown() throws IOException {
1.112 + }
1.113 +
1.114 + @Override
1.115 + public String toString() {
1.116 + return codeSeq.toString();
1.117 + }
1.118 +
1.119 + private class Res implements Bck2Brwsr.Resources {
1.120 + @Override
1.121 + public InputStream get(String resource) throws IOException {
1.122 + for (ClassLoader l : loaders) {
1.123 + URL u = null;
1.124 + Enumeration<URL> en = l.getResources(resource);
1.125 + while (en.hasMoreElements()) {
1.126 + u = en.nextElement();
1.127 + }
1.128 + if (u != null) {
1.129 + return u.openStream();
1.130 + }
1.131 + }
1.132 + throw new IOException("Can't find " + resource);
1.133 + }
1.134 + }
1.135 +}