content: /*
   * SoulFire
   * Copyright (C) 2024  AlexProgrammerDE
   *
   * 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 <https://www.gnu.org/licenses/>.
   */
  package com.soulfiremc.server.util.structs;
  
  import java.util.concurrent.TimeUnit;
  import java.util.function.Supplier;
  
  public final class CachedLazyObject<V> implements Supplier<V> {
    private final Supplier<V> supplier;
    private final long cacheDuration;
    private V value;
    private long invalidAt;
  
    public CachedLazyObject(Supplier<V> supplier, long amount, TimeUnit unit) {
      this.supplier = supplier;
      this.cacheDuration = unit.toMillis(amount);
    }
  
    @Override
    public V get() {
      var now = System.currentTimeMillis();
      if (value == null || now >= invalidAt) {
        synchronized (this) {
          if (value == null || now >= invalidAt) {
            value = supplier.get();
            invalidAt = now + cacheDuration;
          }
        }
      }
      return value;
    }
  }
  