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 /*
27 */
28
29 package java.nio.channels.spi;
30
31 import java.io.IOException;
32 import java.nio.channels.*;
33 import jdk.internal.misc.SharedSecrets;
34 import sun.nio.ch.Interruptible;
35
36
37 /**
38 * Base implementation class for interruptible channels.
39 *
40 * <p> This class encapsulates the low-level machinery required to implement
41 * the asynchronous closing and interruption of channels. A concrete channel
42 * class must invoke the {@link #begin begin} and {@link #end end} methods
43 * before and after, respectively, invoking an I/O operation that might block
44 * indefinitely. In order to ensure that the {@link #end end} method is always
45 * invoked, these methods should be used within a
46 * {@code try} ... {@code finally} block:
47 *
48 * <blockquote><pre id="be">
49 * boolean completed = false;
50 * try {
51 * begin();
52 * completed = ...; // Perform blocking I/O operation
53 * return ...; // Return result
186 * @throws AsynchronousCloseException
187 * If the channel was asynchronously closed
188 *
189 * @throws ClosedByInterruptException
190 * If the thread blocked in the I/O operation was interrupted
191 */
192 protected final void end(boolean completed)
193 throws AsynchronousCloseException
194 {
195 blockedOn(null);
196 Thread interrupted = this.interrupted;
197 if (interrupted != null && interrupted == Thread.currentThread()) {
198 this.interrupted = null;
199 throw new ClosedByInterruptException();
200 }
201 if (!completed && closed)
202 throw new AsynchronousCloseException();
203 }
204
205
206 // -- jdk.internal.misc.SharedSecrets --
207 static void blockedOn(Interruptible intr) { // package-private
208 SharedSecrets.getJavaLangAccess().blockedOn(intr);
209 }
210 }
|
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 /*
27 */
28
29 package java.nio.channels.spi;
30
31 import java.io.IOException;
32 import java.nio.channels.*;
33 import jdk.internal.access.SharedSecrets;
34 import sun.nio.ch.Interruptible;
35
36
37 /**
38 * Base implementation class for interruptible channels.
39 *
40 * <p> This class encapsulates the low-level machinery required to implement
41 * the asynchronous closing and interruption of channels. A concrete channel
42 * class must invoke the {@link #begin begin} and {@link #end end} methods
43 * before and after, respectively, invoking an I/O operation that might block
44 * indefinitely. In order to ensure that the {@link #end end} method is always
45 * invoked, these methods should be used within a
46 * {@code try} ... {@code finally} block:
47 *
48 * <blockquote><pre id="be">
49 * boolean completed = false;
50 * try {
51 * begin();
52 * completed = ...; // Perform blocking I/O operation
53 * return ...; // Return result
186 * @throws AsynchronousCloseException
187 * If the channel was asynchronously closed
188 *
189 * @throws ClosedByInterruptException
190 * If the thread blocked in the I/O operation was interrupted
191 */
192 protected final void end(boolean completed)
193 throws AsynchronousCloseException
194 {
195 blockedOn(null);
196 Thread interrupted = this.interrupted;
197 if (interrupted != null && interrupted == Thread.currentThread()) {
198 this.interrupted = null;
199 throw new ClosedByInterruptException();
200 }
201 if (!completed && closed)
202 throw new AsynchronousCloseException();
203 }
204
205
206 // -- jdk.internal.access.SharedSecrets --
207 static void blockedOn(Interruptible intr) { // package-private
208 SharedSecrets.getJavaLangAccess().blockedOn(intr);
209 }
210 }
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