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
35 /**
36 * CleanerFactory provides a Cleaner for use within system modules.
37 * The cleaner is created on the first reference to the CleanerFactory.
38 */
39 public final class CleanerFactory {
40
41 /* The common Cleaner. */
42 private final static Cleaner commonCleaner = Cleaner.create(new ThreadFactory() {
43 @Override
44 public Thread newThread(Runnable r) {
45 return AccessController.doPrivileged(new PrivilegedAction<>() {
46 @Override
47 public Thread run() {
48 Thread t = InnocuousThread.newSystemThread("Common-Cleaner", r);
49 t.setPriority(Thread.MAX_PRIORITY - 2);
50 return t;
51 }
52 });
53 }
54 });
55
56 /**
57 * Cleaner for use within system modules.
58 *
59 * This Cleaner will run on a thread whose context class loader
60 * is {@code null}. The system cleaning action to perform in
61 * this Cleaner should handle a {@code null} context class loader.
62 *
63 * @return a Cleaner for use within system modules
64 */
65 public static Cleaner cleaner() {
66 return commonCleaner;
67 }
68 }
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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.security.AccessController;
31 import java.security.PrivilegedAction;
32 import java.util.concurrent.ThreadFactory;
33
34 /**
35 * CleanerFactory provides a Cleaner for use within system modules.
36 * The cleaner is created on the first reference to the CleanerFactory.
37 */
38 public final class CleanerFactory {
39
40 /* The common Cleaner. */
41 private final static ExtendedCleaner commonCleaner = ExtendedCleaner.create(
42 new ThreadFactory() {
43 @Override
44 public Thread newThread(Runnable r) {
45 return AccessController.doPrivileged(new PrivilegedAction<>() {
46 @Override
47 public Thread run() {
48 Thread t = InnocuousThread.newSystemThread("Common-Cleaner", r);
49 t.setPriority(Thread.MAX_PRIORITY - 2);
50 return t;
51 }
52 });
53 }
54 }
55 );
56
57 /**
58 * ExtendedCleaner for use within system modules.
59 * <p>
60 * This Cleaner's cleaning loop will run on a thread whose context
61 * class loader is {@code null}. The system cleaning action to perform in
62 * this Cleaner should handle a {@code null} context class loader.
63 * <p>
64 * This Cleaner is an {@link ExtendedCleaner} which supports helping
65 * the cleaner thread from arbitrary application threads. The system cleaning
66 * action to perform in this Cleaner should also handle being executed by
67 * arbitrary application thread.
68 *
69 * @return an ExtendedCleaner for use within system modules
70 */
71 public static ExtendedCleaner cleaner() {
72 return commonCleaner;
73 }
74 }
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