KubernetesHolder.java

/**
 *  Copyright 2005-2016 Red Hat, Inc.
 *
 *  Red Hat licenses this file to you under the Apache License, version
 *  2.0 (the "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 *  implied.  See the License for the specific language governing
 *  permissions and limitations under the License.
 */
package io.fabric8.cdi;

import io.fabric8.kubernetes.client.DefaultKubernetesClient;
import io.fabric8.kubernetes.client.KubernetesClient;

import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.CDI;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;

public class KubernetesHolder {

    private static KubernetesClient client;
    private static final AtomicReference<BeanManager> BEAN_MANAGER = new AtomicReference<>();

    public synchronized static KubernetesClient getClient() {
        if (client != null) {
            return client;
        }
        BeanManager beanManager = getBeanManager();
        if (beanManager != null) {
           Set<Bean<?>> beans = beanManager.getBeans(KubernetesClient.class);
            if (beans.isEmpty()) {
                throw new IllegalStateException("Could not find client beans!");
            } else {
                CreationalContext ctx = beanManager.createCreationalContext(null);
                client = (KubernetesClient) beanManager.getReference(beans.iterator().next(), KubernetesClient.class, ctx);
            }
        } else {
            client = new DefaultKubernetesClient();
        }
        return client;
    }

    private static BeanManager getBeanManager() {
        try {
            return CDI.current().getBeanManager();
        } catch (Throwable t) {
            return BEAN_MANAGER.get();
        }
    }

    public static void useBeanManager(BeanManager beanManager) {
        BEAN_MANAGER.set(beanManager);
    }

}