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.group.impl.driver;
020
021import org.apache.reef.wake.EventHandler;
022
023import javax.inject.Inject;
024import java.util.ArrayList;
025import java.util.List;
026import java.util.logging.Logger;
027
028/**
029 *
030 */
031public class ExceptionHandler implements EventHandler<Exception> {
032  private static final Logger LOG = Logger.getLogger(ExceptionHandler.class.getName());
033  private List<Exception> exceptions = new ArrayList<>();
034
035  @Inject
036  public ExceptionHandler() {
037  }
038
039  @Override
040  public synchronized void onNext(final Exception ex) {
041    LOG.entering("ExceptionHandler", "onNext", new Object[]{ex});
042    exceptions.add(ex);
043    LOG.finest("Got an exception. Added it to list(" + exceptions.size() + ")");
044    LOG.exiting("ExceptionHandler", "onNext");
045  }
046
047  public synchronized boolean hasExceptions() {
048    LOG.entering("ExceptionHandler", "hasExceptions");
049    final boolean ret = !exceptions.isEmpty();
050    LOG.finest("There are " + exceptions.size() + " exceptions. Clearing now");
051    exceptions.clear();
052    LOG.exiting("ExceptionHandler", "hasExceptions", ret);
053    return ret;
054  }
055
056}