dubbo SpringContainer

dubbo SpringContainer

Spring启动类容器

SPI service provider interfaces 服务提供借口

Singleton 单例

ThreadSafe 线程安全

/*
 * 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 com.alibaba.dubbo.container.spring;

import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import com.alibaba.dubbo.common.utils.ConfigUtils;
import com.alibaba.dubbo.container.Container;

import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * SpringContainer. (SPI, Singleton, ThreadSafe)
 */
public class SpringContainer implements Container {

    public static final String SPRING_CONFIG = "dubbo.spring.config";//首先加载配置文件位置 通过dubbo配置文件配置或者java启动命令-D配置 找不到则加载 DEFAULT_SPRING_CONFIG
    public static final String DEFAULT_SPRING_CONFIG = "classpath*:META-INF/spring/*.xml";//spring相关配置文件默认存放位置
    private static final Logger logger = LoggerFactory.getLogger(SpringContainer.class);
    static ClassPathXmlApplicationContext context;

    public static ClassPathXmlApplicationContext getContext() {
        return context;
    }

    public void start() {
        String configPath = ConfigUtils.getProperty(SPRING_CONFIG);
        if (configPath == null || configPath.length() == 0) {
            configPath = DEFAULT_SPRING_CONFIG;
        }
        context = new ClassPathXmlApplicationContext(configPath.split("[,\s]+"));
        context.start();
    }

    public void stop() {
        try {
            if (context != null) {
                context.stop();
                context.close();
                context = null;
            }
        } catch (Throwable e) {
            logger.error(e.getMessage(), e);
        }
    }

}

如果直接使用SpringContainer 则需要把相应的配置文件放到相应的位置，SpringContainer使用common log，

一般 通过实现Container接口，自定义加载配置文件，slf4j接口使用日志。可以按照SpringContainer的方式实现start stop方法，start方法一般添加shutdownhook

package org.multitest.dubbo;

import com.alibaba.dubbo.container.Container;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;

/**
 * DubboServer
 */
public class DubboServer implements Container {
    private static final Logger logger = LoggerFactory.getLogger(DubboServer.class);
    private ClassPathXmlApplicationContext context;

    @Override
    public void start(){
        context = new ClassPathXmlApplicationContext(new String[] {"server.xml"});
        context.start();
        context.registerShutdownHook();
        logger.info("service start success");
    }

    @Override
    public void stop() {
        try {
            if (context != null) {
                context.stop();
                context.close();
                context = null;
            }
            logger.info("service stop success");
        } catch (Throwable e) {
            logger.error(e.getMessage(), e);
        }
    }

    private static volatile boolean running = true;
    public static void main(String[] args) {
        try{
            Container container = new DubboServer();
            logger.info("Use container type(" + Arrays.toString(args) + ") to run dubbo serivce.");

            Runtime.getRuntime().addShutdownHook(new Thread() {
                public void run() {
                    try {
                        container.stop();
                        logger.info("Dubbo " + container.getClass().getSimpleName() + " stopped!");
                    } catch (Throwable t) {
                        logger.error(t.getMessage(), t);
                    }
                    synchronized (DubboServer.class) {
                        running = false;
                        DubboServer.class.notify();
                    }
                }
            });

            container.start();
            logger.info("Dubbo " + container.getClass().getSimpleName() + " started!");
            System.out.println(new SimpleDateFormat("[yyyy-MM-dd HH:mm:ss]").format(new Date()) + " Dubbo service server started!");
        } catch (RuntimeException e) {
            logger.error(e.getMessage(), e);
            System.out.println(e);
            System.exit(1);
        }
        synchronized (DubboServer.class) {
            while (running) {
                try {
                    DubboServer.class.wait();
                } catch (Throwable e) {
                }
            }
        }
    }
}