content: /**
   * Licensed 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.aurora.scheduler.offers;
  
  import java.util.Set;
  import java.util.concurrent.ConcurrentSkipListSet;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.collect.Ordering;
  import com.google.inject.Inject;
  
  import org.apache.aurora.scheduler.base.TaskGroupKey;
  import org.apache.aurora.scheduler.filter.SchedulingFilter.ResourceRequest;
  
  /**
   * Default implementation for OfferSet. Backed by a ConcurrentSkipListSet.
   */
  @VisibleForTesting
  public class OfferSetImpl implements OfferSet {
  
    private final Set<HostOffer> offers;
  
    @Inject
    public OfferSetImpl(Ordering<HostOffer> ordering) {
      offers = new ConcurrentSkipListSet<>(ordering);
    }
  
    @Override
    public void add(HostOffer offer) {
      offers.add(offer);
    }
  
    @Override
    public void remove(HostOffer removed) {
      offers.remove(removed);
    }
  
    @Override
    public int size() {
      // Potential gotcha - since this is a ConcurrentSkipListSet, size() is more expensive.
      // Could track this separately if it turns out to pose problems.
      return offers.size();
    }
  
    @Override
    public void clear() {
      offers.clear();
    }
  
    @Override
    public Iterable<HostOffer> values() {
      return offers;
    }
  
    @Override
    public Iterable<HostOffer> getOrdered(TaskGroupKey groupKey, ResourceRequest resourceRequest) {
      return offers;
    }
  }
  