SharedContextEvaluator.java revision 877:cf4d2252d444 
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
26package jdk.nashorn.internal.test.framework;
27
28import static jdk.nashorn.internal.runtime.Source.sourceFor;
29import static jdk.nashorn.tools.Shell.COMPILATION_ERROR;
30import static jdk.nashorn.tools.Shell.RUNTIME_ERROR;
31import static jdk.nashorn.tools.Shell.SUCCESS;
32
33import java.io.File;
34import java.io.IOException;
35import java.io.OutputStream;
36import java.io.PrintWriter;
37import jdk.nashorn.api.scripting.NashornException;
38import jdk.nashorn.internal.objects.Global;
39import jdk.nashorn.internal.runtime.Context;
40import jdk.nashorn.internal.runtime.ErrorManager;
41import jdk.nashorn.internal.runtime.ScriptFunction;
42import jdk.nashorn.internal.runtime.ScriptRuntime;
43import 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 */
49public 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(final byte[] b) throws IOException {
78            underlying.write(b);
79        }
80
81        @Override
82        public void write(final byte[] b, final int off, final int len) throws IOException {
83            underlying.write(b, off, len);
84        }
85
86        @Override
87        public void write(final int b) throws IOException {
88            underlying.write(b);
89        }
90
91        void setDelegatee(final 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        final PrintWriter wout = new PrintWriter(ctxOut, true);
104        final PrintWriter werr = new PrintWriter(ctxErr, true);
105        final Options options = new Options("nashorn", werr);
106        options.process(args);
107        final 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                final ScriptFunction script = context.compileScript(sourceFor(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}
154