dubbo-kubernetes/src/main/java/org/apache/dubbo/registry/kubernetes/KubernetesMeshEnvListenerFactory.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 org.apache.dubbo.registry.kubernetes;

import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.rpc.cluster.router.mesh.route.MeshEnvListener;
import org.apache.dubbo.rpc.cluster.router.mesh.route.MeshEnvListenerFactory;

import java.util.concurrent.atomic.AtomicBoolean;

public class KubernetesMeshEnvListenerFactory implements MeshEnvListenerFactory {
    public static final Logger logger = LoggerFactory.getLogger(KubernetesMeshEnvListenerFactory.class);
    private final AtomicBoolean initialized = new AtomicBoolean(false);
    private MeshEnvListener listener = null;

    @Override
    public MeshEnvListener getListener() {
        try {
            if (initialized.compareAndSet(false, true)) {
                listener = new NopKubernetesMeshEnvListener();
            }
        } catch (Throwable t) {
            logger.info("Current Env not support Kubernetes.");
        }
        return listener;
    }
}