fr.ms.lang.ref.NotifyReferenceObject Maven / Gradle / Ivy

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/*
 * This file is part of Log4Jdbc.
 *
 * Log4Jdbc 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.
 *
 * Log4Jdbc 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 Log4Jdbc.  If not, see .
 *
 */
package fr.ms.lang.ref;

import java.lang.ref.Reference;
import java.lang.ref.SoftReference;

import fr.ms.lang.SystemPropertyUtils;

/**
 *
 * @see Marco4J
 *
 *
 * @author Marco Semiao
 *
 */
public class NotifyReferenceObject implements ReferenceObject {

    private final static boolean printCleanReference = SystemPropertyUtils.getProperty("notifyReferenceObject.print", false);

    private final String message;

    private final Reference reference;

    NotifyReferenceObject(final String message, final Reference reference) {
	this.message = message;
	this.reference = reference;
    }

    public void clear() {
	reference.clear();
    }

    public boolean enqueue() {
	return reference.enqueue();
    }

    public Object get() {
	final Object obj = reference.get();

	if (obj == null && printCleanReference) {
	    System.out.println(message);
	}
	return obj;
    }

    public boolean isEnqueued() {
	return reference.isEnqueued();
    }

    static ReferenceObject newSoftReference(final String message, final Object referent) {
	final Reference soft = new SoftReference(referent);

	return new NotifyReferenceObject(message, soft);
    }
}