Clean up CDI Instances (Dependent only)

Instances.java

/*
 * Copyright 2018, Red Hat, Inc. and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
import javax.enterprise.context.Dependent;

import org.jboss.weld.inject.WeldInstance;
import org.zanata.magpie.service.TranslatorBackend;

/**
 * @author Sean Flanigan <a href="mailto:sflaniga@redhat.com">sflaniga@redhat.com</a>
 */
public class Instances {
    private Instances() {}

    /**
     * Destroys any Dependent scoped beans represented by these handlers.
     * Note that WeldInstance.handlers().iterator() returns new Handlers each
     * time it is called, so you may need to copy the handlers to a collection
     * before using them, then pass that same collection to this method for
     * cleanup.
     * <p>
     * Sample usage:
     *
     * <pre>{@code
     * @Inject WeldInstance<MyBean> instances;
     * List<WeldInstance.Handler<MyBean>> handlers = new ArrayList<>();
     *
     * @PostConstruct public void postConstruct() {
     *     instances.handlers().forEach(handlers::add);
     * }
     *
     * public void someOtherMethod() {
     *     handlers.forEach(h -> h.get().myBeanMethod());
     * }
     * 
     * @PreDestroy public void preDestroy() {
     *     Instances.destroyDependentBeans(handlers);
     * }
     * }</pre>
     *
     * * @param instanceHandlers
     */
    public static void destroyDependentBeans(
            Iterable<WeldInstance.Handler<TranslatorBackend>> instanceHandlers) {
        instanceHandlers.forEach(h -> {
            if (h.getBean().getScope().equals(Dependent.class)) {
                // Destroy only Dependent beans
                h.destroy();
            }
        });
    }

}