content: /**
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.transport.nio;
  
  import java.nio.channels.CancelledKeyException;
  import java.nio.channels.ClosedChannelException;
  import java.nio.channels.SelectionKey;
  import java.nio.channels.spi.AbstractSelectableChannel;
  import java.util.concurrent.atomic.AtomicBoolean;
  
  import org.apache.activemq.transport.nio.SelectorManager.Listener;
  
  /**
   *
   */
  public final class SelectorSelection {
  
      private final SelectorWorker worker;
      private final Listener listener;
      private int interest;
      private SelectionKey key;
      private final AtomicBoolean closed = new AtomicBoolean();
  
      public SelectorSelection(final SelectorWorker worker, final AbstractSelectableChannel selectable, Listener listener) throws ClosedChannelException {
          this.worker = worker;
          this.listener = listener;
          worker.addIoTask(new Runnable() {
              @Override
              public void run() {
                  try {
                      SelectorSelection.this.key = selectable.register(worker.selector, 0, SelectorSelection.this);
                  } catch (Exception e) {
                      onError(e);
                  }
              }
          });
      }
  
      public void setInterestOps(int ops) {
          interest = ops;
      }
  
      public void enable() {
          worker.addIoTask(new Runnable() {
              @Override
              public void run() {
                  try {
                      key.interestOps(interest);
                  } catch (CancelledKeyException e) {
                  }
              }
          });
      }
  
      public void disable() {
          worker.addIoTask(new Runnable() {
              @Override
              public void run() {
                  try {
                      key.interestOps(0);
                  } catch (CancelledKeyException e) {
                  }
              }
          });
      }
  
      public void close() {
          if (closed.compareAndSet(false, true)) {
              worker.addIoTask(new Runnable() {
                  @Override
                  public void run() {
                      try {
                          key.cancel();
                      } catch (CancelledKeyException e) {
                      } finally {
                          worker.release();
                      }
                  }
              });
          }
      }
  
      public void onSelect() {
          listener.onSelect(this);
      }
  
      public void onError(Throwable e) {
          listener.onError(this, e);
      }
  }
  