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    1   /*
    2    * Copyright 2009 Red Hat, Inc.
    3    *
    4    * Red Hat licenses this file to you under the Apache License, version 2.0
    5    * (the "License"); you may not use this file except in compliance with the
    6    * License.  You may obtain a copy of the License at:
    7    *
    8    *    http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    13   * License for the specific language governing permissions and limitations
    14   * under the License.
    15   */
    16  package org.jboss.netty.channel.socket.nio;
    17
    18  import java.io.IOException;
    19  import java.nio.channels.CancelledKeyException;
    20  import java.nio.channels.Selector;
    21
    22  import org.jboss.netty.logging.InternalLogger;
    23  import org.jboss.netty.logging.InternalLoggerFactory;
    24
    25  /**
    26   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    27   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    28   * @version $Rev: 2200 $, $Date: 2010-02-23 14:42:39 +0900 (Tue, 23 Feb 2010) $
    29   */
    30  final class SelectorUtil {
    31      private static final InternalLogger logger =
    32          InternalLoggerFactory.getInstance(SelectorUtil.class);
    33
    34      static final int DEFAULT_IO_THREADS = Runtime.getRuntime().availableProcessors() * 2;
    35
    36      static void select(Selector selector) throws IOException {
    37          try {
    38              selector.select(500);
    39          } catch (CancelledKeyException e) {
    40              // Harmless exception - log anyway
    41              logger.debug(
    42                      CancelledKeyException.class.getSimpleName() +
    43                      " raised by a Selector - JDK bug?", e);
    44          }
    45      }
    46  }