/hudson-remoting/src/main/java/hudson/remoting/PreloadJarTask.java

 1/*
 2 * The MIT License
 3 * 
 4 * Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
 5 * 
 6 * Permission is hereby granted, free of charge, to any person obtaining a copy
 7 * of this software and associated documentation files (the "Software"), to deal
 8 * in the Software without restriction, including without limitation the rights
 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 * 
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 * 
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24package hudson.remoting;
25
26import java.io.IOException;
27import java.net.URL;
28
29/**
30 * {@link Callable} used to deliver a jar file to {@link RemoteClassLoader}.
31 *
32 * @author Kohsuke Kawaguchi
33 */
34final class PreloadJarTask implements DelegatingCallable<Boolean,IOException> {
35    /**
36     * Jar file to be preloaded.
37     */
38    private final URL[] jars;
39
40    private transient ClassLoader target;
41
42    PreloadJarTask(URL[] jars, ClassLoader target) {
43        this.jars = jars;
44        this.target = target;
45    }
46
47    public ClassLoader getClassLoader() {
48        return target;
49    }
50
51    public Boolean call() throws IOException {
52        ClassLoader cl = Thread.currentThread().getContextClassLoader();
53        if (!(cl instanceof RemoteClassLoader))
54            return false;
55
56        RemoteClassLoader rcl = (RemoteClassLoader) cl;
57        boolean r = false;
58        for (URL jar : jars)
59            r |= rcl.prefetch(jar);
60        return r;
61    }
62}