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/*
 *     This file is part of Discord4J.
 *
 *     Discord4J is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     Discord4J 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 Lesser General Public License for more details.
 *
 *     You should have received a copy of the GNU Lesser General Public License
 *     along with Discord4J.  If not, see .
 */

package sx.blah.discord.util;

import java.util.function.Supplier;

/**
 * A value that can be lazily updated after a set time.
 *
 * @param  The type of the object to be initialized.
 */
public class TimedValue extends Lazy {

	/**
	 * The amount of time, in milliseconds, before the value should be updated.
	 */
	private final long timeToInvalidate;
	/**
	 * The last time the value was updated.
	 */
	private long time;

	public TimedValue(long timeToInvalidate, Supplier supplier) {
		super(supplier);
		this.timeToInvalidate = timeToInvalidate;
	}

	@Override
	public T get() {
		if (obj == null || System.currentTimeMillis() - time >= timeToInvalidate) {
			obj = supplier.get();
			time = System.currentTimeMillis();
		}
		return obj;
	}
}