dubbo-registry-extensions/dubbo-registry-polaris/src/main/java/org/apache/dubbo/registry/polaris/task/TaskScheduler.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.polaris.task;

import com.tencent.polaris.client.util.NamedThreadFactory;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;

public class TaskScheduler {

    private final ExecutorService fetchExecutor = Executors
        .newSingleThreadExecutor(new NamedThreadFactory("agent-fetch"));

    private final ExecutorService watchExecutor = Executors
        .newSingleThreadExecutor(new NamedThreadFactory("agent-retry-watch"));

    private final AtomicBoolean executorDestroyed = new AtomicBoolean(false);

    private final Object lock = new Object();

    public void submitFetchTask(Runnable fetchTask) {
        if (executorDestroyed.get()) {
            return;
        }
        synchronized (lock) {
            if (executorDestroyed.get()) {
                return;
            }
            fetchExecutor.submit(fetchTask);
        }
    }

    public void submitWatchTask(Runnable watchTask) {
        if (executorDestroyed.get()) {
            return;
        }
        synchronized (lock) {
            if (executorDestroyed.get()) {
                return;
            }
            watchExecutor.submit(watchTask);
        }
    }

    public boolean isDestroyed() {
        return executorDestroyed.get();
    }

    public void destroy() {
        synchronized (lock) {
            if (executorDestroyed.compareAndSet(false, true)) {
                fetchExecutor.shutdown();
                watchExecutor.shutdown();
            }
        }
    }
}