ProcessStatusMap.java

package nl.knaw.huygens.alexandria.api.model;

/*
 * #%L
 * alexandria-api
 * =======
 * Copyright (C) 2015 - 2017 Huygens ING (KNAW)
 * =======
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

import static java.util.stream.Collectors.toList;

import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.UUID;

import javax.inject.Singleton;

import com.google.common.collect.Maps;

@Singleton
public class ProcessStatusMap<T extends ProcessStatus> {
  private Map<UUID, T> map = Maps.newHashMap();

  public void put(UUID id, T status) {
    removeExpiredTasks();
    map.put(id, status);
  }

  public Optional<T> get(UUID id) {
    removeExpiredTasks();
    return Optional.ofNullable(map.get(id));
  }

  public void removeExpiredTasks() {
    List<UUID> expiredEntries = map.keySet().stream()//
        .filter(uuid -> map.get(uuid).isExpired())//
        .collect(toList());
    expiredEntries.forEach(key -> map.remove(key));
  }

}