分布式_事务_02_2PC框架raincat源码解析

一、前言

上一节已经将raincat demo工程运行起来了，这一节来分析下raincat的源码

二、协调者启动过程

主要就是在启动类中通过如下代码来启动 netty

nettyService.start()

三、参与者启动过程

1.参与者启动时序图

参与者在启动过程中，主要做了如下4件事：

（1）保存SpringContext上下文

（2）通过加载spi，来使用用户自定义配置

（3）启动Netty客户端，与txManager进行连接，并且维持心跳。

（4）启动事务补偿任务，建表，定时补偿。

（5）启动事务事件发布器。

如下图：

分布式_事务_02_2PC框架raincat源码解析

2.保存Spring上下文

源码见 SpringBeanUtils 类，设置Spring 上下文，并提供spring bean 的注册与获取方法。

/*
 * 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.raincat.core.helper;

import org.springframework.context.ConfigurableApplicationContext;

/**
 * SpringBeanUtils.
 * @author xiaoyu
 */
public final class SpringBeanUtils {

    private static final SpringBeanUtils INSTANCE = new SpringBeanUtils();

    private ConfigurableApplicationContext cfgContext;

    private SpringBeanUtils() {
        if (INSTANCE != null) {
            throw new Error("error");
        }
    }

    /**
     * get SpringBeanUtils.
     * @return SpringBeanUtils
     */
    public static SpringBeanUtils getInstance() {
        return INSTANCE;
    }

    /**
     * acquire spring bean.
     *
     * @param type type
     * @param <T>  class
     * @return bean
     */
    public <T> T getBean(final Class<T> type) {
        return cfgContext.getBean(type);
    }

    /**
     * register bean in spring ioc.
     * @param beanName bean name
     * @param obj bean
     */
    public void registerBean(final String beanName, final Object obj) {
        cfgContext.getBeanFactory().registerSingleton(beanName, obj);
    }

    /**
     * set application context.
     * @param cfgContext application context
     */
    public void setCfgContext(final ConfigurableApplicationContext cfgContext) {
        this.cfgContext = cfgContext;
    }
}

View Code