1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.test.framework;
  27 
  28 import static jdk.nashorn.tools.Shell.COMPILATION_ERROR;
  29 import static jdk.nashorn.tools.Shell.RUNTIME_ERROR;
  30 import static jdk.nashorn.tools.Shell.SUCCESS;
  31 
  32 import java.io.File;
  33 import java.io.IOException;
  34 import java.io.OutputStream;
  35 import java.io.PrintWriter;
  36 import jdk.nashorn.api.scripting.NashornException;
  37 import jdk.nashorn.internal.objects.Global;
  38 import jdk.nashorn.internal.runtime.Context;
  39 import jdk.nashorn.internal.runtime.ErrorManager;
  40 import jdk.nashorn.internal.runtime.ScriptFunction;

  41 import jdk.nashorn.internal.runtime.ScriptRuntime;
  42 import jdk.nashorn.internal.runtime.Source;
  43 import jdk.nashorn.internal.runtime.options.Options;
  44 
  45 /**
  46  * A script evaluator that shares a single Nashorn Context instance to run
  47  * scripts many times on it.
  48  */
  49 public final class SharedContextEvaluator implements ScriptEvaluator {
  50     // The shared Nashorn Context
  51     private final Context context;
  52 
  53     // We can't replace output and error streams after Context is created
  54     // So, we create these delegating streams - so that we can replace underlying
  55     // delegate streams for each script run call
  56     private final DelegatingOutputStream ctxOut;
  57     private final DelegatingOutputStream ctxErr;
  58 
  59     private static class DelegatingOutputStream extends OutputStream {
  60         private OutputStream underlying;
  61 
  62         public DelegatingOutputStream(final OutputStream out) {
  63             this.underlying = out;
  64         }
  65 
  66         @Override
  67         public void close() throws IOException {
  68             underlying.close();
  69         }
  70 
  71         @Override
  72         public void flush() throws IOException {
  73             underlying.flush();
  74         }
  75 
  76         @Override
  77         public void write(byte[] b) throws IOException {
  78             underlying.write(b);
  79         }
  80 
  81         @Override
  82         public void write(byte[] b, int off, int len) throws IOException {
  83             underlying.write(b, off, len);
  84         }
  85 
  86         @Override
  87         public void write(int b) throws IOException {
  88             underlying.write(b);
  89         }
  90 
  91         void setDelegatee(OutputStream stream) {
  92             this.underlying = stream;
  93         }
  94     }
  95 
  96     /**
  97      * SharedContextEvaluator constructor
  98      * @param args initial script arguments to create shared context
  99      */
 100     public SharedContextEvaluator(final String[] args) {
 101         this.ctxOut = new DelegatingOutputStream(System.out);
 102         this.ctxErr = new DelegatingOutputStream(System.err);
 103         PrintWriter wout = new PrintWriter(ctxOut, true);
 104         PrintWriter werr = new PrintWriter(ctxErr, true);
 105         Options options = new Options("nashorn", werr);
 106         options.process(args);
 107         ErrorManager errors = new ErrorManager(werr);
 108         this.context = new Context(options, errors, wout, werr, Thread.currentThread().getContextClassLoader());
 109     }
 110 
 111     @Override
 112     public int run(final OutputStream out, final OutputStream err, final String[] args) throws IOException {
 113         final Global oldGlobal = Context.getGlobal();
 114         try {
 115             ctxOut.setDelegatee(out);
 116             ctxErr.setDelegatee(err);
 117             final ErrorManager errors = context.getErrorManager();
 118             final Global global = context.createGlobal();
 119             Context.setGlobal(global);
 120 
 121             // For each file on the command line.
 122             for (final String fileName : args) {
 123                 if (fileName.startsWith("-")) {
 124                     // ignore options in shared context mode (which was initialized upfront!)
 125                     continue;
 126                 }
 127                 final File file = new File(fileName);
 128                 ScriptFunction script = context.compileScript(new Source(fileName, file.toURI().toURL()), global);
 129 
 130                 if (script == null || errors.getNumberOfErrors() != 0) {
 131                     return COMPILATION_ERROR;
 132                 }
 133 
 134                 try {
 135                     ScriptRuntime.apply(script, global);
 136                 } catch (final NashornException e) {
 137                     errors.error(e.toString());
 138                     if (context.getEnv()._dump_on_error) {
 139                         e.printStackTrace(context.getErr());
 140                     }
 141 
 142                     return RUNTIME_ERROR;
 143                 }
 144             }
 145         } finally {
 146             context.getOut().flush();
 147             context.getErr().flush();
 148             Context.setGlobal(oldGlobal);
 149         }
 150 
 151         return SUCCESS;
 152     }
 153 }
--- EOF ---