interface.js revision 802:235d22ccfd24 
1#// Usage: jjs -scripting interface.js
2
3/*
4 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 *   - Redistributions of source code must retain the above copyright
11 *     notice, this list of conditions and the following disclaimer.
12 *
13 *   - Redistributions in binary form must reproduce the above copyright
14 *     notice, this list of conditions and the following disclaimer in the
15 *     documentation and/or other materials provided with the distribution.
16 *
17 *   - Neither the name of Oracle nor the names of its
18 *     contributors may be used to endorse or promote products derived
19 *     from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
22 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
28 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34// Example demonstrating how to implement a Java interface
35// whose methods are backed by global script functions
36
37var ScriptEngineManager = Java.type("javax.script.ScriptEngineManager");
38// create manager
39var manager = new ScriptEngineManager();
40// create engine
41var engine = manager.getEngineByName("js");
42
43// eval code - too many script escapes?
44// use heredoc !
45engine.eval(<<CODE
46function run() {
47    print("run global function called");
48}
49CODE);
50
51// create Java interface object whose methods are
52// implemented by script functions. This is from
53// javax.script.Invocable. But we are in JS world,
54// don't worry about types :)
55
56var Runnable = Java.type("java.lang.Runnable");
57var r = engine.getInterface(Runnable.class);
58print(r.class);
59
60r.run();
61