dubbo-common/src/main/java/org/apache/dubbo/common/threadpool/manager/ExecutorRepository.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.common.threadpool.manager;

import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.SPI;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledExecutorService;

/**
 *
 */
@SPI("default")
public interface ExecutorRepository {

    /**
     * Called by both Client and Server. TODO, consider separate these two parts.
     * When the Client or Server starts for the first time, generate a new threadpool according to the parameters specified.
     *
     * @param url
     * @return
     */
    ExecutorService createExecutorIfAbsent(URL url);

    ExecutorService getExecutor(URL url);

    /**
     * Modify some of the threadpool's properties according to the url, for example, coreSize, maxSize, ...
     *
     * @param url
     * @param executor
     */
    void updateThreadpool(URL url, ExecutorService executor);

    /**
     * Returns a scheduler from the scheduler list, call this method whenever you need a scheduler for a cron job.
     * If your cron cannot burden the possible schedule delay caused by sharing the same scheduler, please consider define a dedicate one.
     *
     * @return
     */
    ScheduledExecutorService nextScheduledExecutor();

    ScheduledExecutorService getServiceExporterExecutor();

    /**
     * Scheduled executor handle registry notification.
     *
     * @return
     */
    ScheduledExecutorService getRegistryNotificationExecutor();

    /**
     * Get the default shared threadpool.
     *
     * @return
     */
    ExecutorService getSharedExecutor();

}