ContentContext.java

Go to the documentation of this file.

/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2019 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.action.content;
 
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Supplier;
import org.amic.util.date.CheckDate;
 
public class ContentContext {
 
  private static final Map<String, SingleContent> contexts = Collections.synchronizedMap(new HashMap<>());
  
  public static Object getContent(String context, Supplier onDefault) {
    Object obj = getContent(context);
    if(obj == null) {
      obj = onDefault.get();
      if(obj != null) {
        putContent(context, obj);
      }
    }
    return obj;
  }
  
  public static Object getContent(String context) {
    SingleContent sc = contexts.get(context);
    return sc != null ? sc.getObject() : null;
  }
  
  public static void putContent(String context, Object data) {
    SingleContent sc = new SingleContent(new Date(), data);
    contexts.put(context, sc);
  }
  
  public static void removeContent(String context) {
    contexts.remove(context);
    purge();
  }
  
  private static void purge() {
    Date old = new CheckDate().addMonths(-1).getDate();
    contexts.entrySet().stream().filter((entry) -> (entry.getValue().getDate().before(old))).forEachOrdered((entry) -> {
      contexts.remove(entry.getKey());
    });
  }
  
}