net.sf.aguacate.security.service.SecurityServiceCoupling Maven / Gradle / Ivy

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package net.sf.aguacate.security.service;

import java.util.Iterator;
import java.util.ServiceLoader;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public final class SecurityServiceCoupling {

	private static final Logger LOGGER = LogManager.getLogger(SecurityServiceCoupling.class);

	private static final SecurityService INSTANCE;

	static {
		Iterator iterator = ServiceLoader.load(SecurityService.class).iterator();
		if (iterator.hasNext()) {
			INSTANCE = iterator.next();
			while (iterator.hasNext()) {
				SecurityService temp = iterator.next();
				if (LOGGER.isWarnEnabled()) {
					LOGGER.warn("Unused instance of {}", temp.getClass().getName());
				}
			}
		} else {
			if (LOGGER.isWarnEnabled()) {
				LOGGER.warn("No instance of {} found (NULL instance)", SecurityService.class.getName());
			}
			INSTANCE = null;
		}
	}

	private SecurityServiceCoupling() {
	}

	public static SecurityService service() {
		return INSTANCE;
	}

}