Source code

001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.io.network.impl;
020
021import org.apache.reef.evaluator.context.events.ContextStop;
022import org.apache.reef.io.network.naming.NameServer;
023import org.apache.reef.wake.EventHandler;
024
025import javax.inject.Inject;
026import java.util.logging.Level;
027import java.util.logging.Logger;
028
029public final class NameServiceCloseHandler implements EventHandler<ContextStop> {
030
031  private static final Logger LOG = Logger.getLogger(NameServiceCloseHandler.class.getName());
032
033  private final AutoCloseable toClose;
034
035  @Inject
036  public NameServiceCloseHandler(final NameServer toClose) {
037    this.toClose = toClose;
038  }
039
040  @Override
041  public void onNext(final ContextStop event) {
042    try {
043      LOG.log(Level.FINEST, "Closing {0}", this.toClose);
044      this.toClose.close();
045    } catch (final Exception ex) {
046      LOG.log(Level.SEVERE, "Exception while closing " + this.toClose, ex);
047    }
048  }
049}