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.internal.ref;
27
28 import java.lang.ref.Cleaner;
29
30 /**
31 * CleanerFactory provides a Cleaner for use within OpenJDK modules.
32 * The cleaner is created on the first reference to the CleanerFactory.
33 */
34 public final class CleanerFactory {
35
36 /* The common Cleaner. */
37 private final static Cleaner commonCleaner = Cleaner.create();
38
39 /**
40 * Cleaner for use within OpenJDK modules.
41 *
42 * @return a Cleaner for use within OpenJDK modules
43 */
44 public static Cleaner cleaner() {
45 return commonCleaner;
46 }
47
48 }
|
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.internal.ref;
27
28 import jdk.internal.misc.InnocuousThread;
29
30 import java.lang.ref.Cleaner;
31 import java.security.AccessController;
32 import java.security.PrivilegedAction;
33 import java.util.concurrent.ThreadFactory;
34 import java.util.concurrent.atomic.AtomicInteger;
35
36 /**
37 * CleanerFactory provides a Cleaner for use within OpenJDK modules.
38 * The cleaner is created on the first reference to the CleanerFactory.
39 */
40 public final class CleanerFactory {
41
42 /* The common Cleaner. */
43 private final static Cleaner commonCleaner =
44 Cleaner.create(new InnocuousThreadFactory(false));
45
46 /**
47 * Cleaner for use within system modules.
48 *
49 * This Cleaner will run on a thread whose context class loader is null
50 * and system cleaner code has to handle null thread class loader.
51 *
52 * @return a Cleaner for use within system modules
53 */
54 public static Cleaner cleaner() {
55 return commonCleaner;
56 }
57
58
59 /**
60 * A ThreadFactory for InnocuousThreads.
61 */
62 static final class InnocuousThreadFactory implements ThreadFactory {
63 private final boolean hasContextClassLoader;
64 InnocuousThreadFactory() {
65 this(true);
66 }
67
68 InnocuousThreadFactory(boolean hasTCCL) {
69 this.hasContextClassLoader = hasTCCL;
70 }
71
72 public Thread newThread(Runnable r) {
73 return AccessController.doPrivileged(new PrivilegedAction<Thread>() {
74 @Override
75 public Thread run() {
76 Thread t = new InnocuousThread(r, nextThreadName(), hasContextClassLoader);
77 t.setPriority(Thread.MAX_PRIORITY - 2);
78 return t;
79 }
80 });
81 }
82
83 final static AtomicInteger cleanerThreadNumber = new AtomicInteger();
84 static String nextThreadName() {
85 return "Cleaner-" + cleanerThreadNumber.getAndIncrement();
86 }
87 }
88 }
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