Spring Boot Druid 多数据源 Atomikos 分布式事务
1、前言
由于最近需要做一个接口平台，用到了两个数据库(业务库和系统库分离)，需要考虑同时操作两个数据库的数据时事务的管理，这时搜索了下资料，发现使用分布式事务可满足现状需求。之前也没接触过分布式事务，在baidu、google了一遍之后，根据相关的示例也未成功搭建。在一番折腾之后，终于搭建成功， 现将其记录下来，也为将来有此需求的朋友提供一点帮助。
2、名词解释
1、Spring Boot：Spring Boot是由Pivotal团队提供的全新框架，其设计目的是用来简化新Spring应用的初始搭建以及开发过程。该框架使用了特定的方式来进行配置，从而使开发人员不再需要定义样板化的配置。官网地址：http://projects.spring.io/spring-boot/
2、Druid：阿里的JDBC连接池组件，详细参考：https://github.com/alibaba/druid
3、分布式事务 : 参考博客（http://www.cnblogs.com/zengkefu/p/5742617.html）
4、Atomikos：一个为Java平台提供增值服务的并且开源类事务管理器。
3、环境搭建
1、项目目录结构（maven项目）：
2、pom.xml
<properties>
<spring.boot.version>1.5.4.RELEASEspring.boot.version>
<druid.version>1.0.31druid.version>
properties>
<dependencies>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
<version>${spring.boot.version}version>
<exclusions>
<exclusion>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-tomcatartifactId>
exclusion>
exclusions>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jettyartifactId>
<version>${spring.boot.version}version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jdbcartifactId>
<version>${spring.boot.version}version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-jta-atomikosartifactId>
<version>${spring.boot.version}version>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<version>${spring.boot.version}version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>${druid.version}version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druid-spring-boot-starterartifactId>
<version>1.1.1version>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.42version>
dependency>
dependencies>
3、application.yml
#日志配置
#日志配置，此处使用默认日志
#logging:
# config: classpath:log4j2.yml
# spring
spring:
profiles:
active:
- test
datasource:
type: com.alibaba.druid.pool.xa.DruidXADataSource
druid:
# WebStatFilter配置，说明请参考Druid Wiki，配置_配置WebStatFilter
web-stat-filter:
enabled: true
urlPattern:
exclusions:
sessionStatMaxCount:
sessionStatEnable:
principalSessionName:
principalCookieName:
profileEnable:
# StatViewServlet配置，说明请参考Druid Wiki，配置_StatViewServlet配置
stat-view-servlet:
enabled: true
urlPattern:
resetEnable: false
loginUsername: admin
loginPassword: 123456
allow: 127.0.0.1
deny:
# Spring监控配置，说明请参考Druid Github Wiki，配置_Druid和Spring关联监控配置
# Spring监控AOP切入点，如x.y.z.service.*,配置多个英文逗号分隔
aop-patterns:
- com.chint.springboot.atomikos.*.service.**
systemDB:
name: systemDB
url: jdbc:mysql://localhost/test_sys
username: root
password: 123456a
# 下面为连接池的补充设置，应用到上面所有数据源中
# 初始化大小，最小，最大
initialSize: 5
minIdle: 5
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
minEvictableIdleTimeMillis: 30
validationQuery: SELECT 1
validationQueryTimeout: 10000
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
# 打开PSCache，并且指定每个连接上PSCache的大小
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,wall
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
useGlobalDataSourceStat: true
businessDB:
name: businessDB
url: jdbc:mysql://localhost/test_bus
username: root
password: 123456a
# 下面为连接池的补充设置，应用到上面所有数据源中
# 初始化大小，最小，最大
initialSize: 5
minIdle: 5
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
minEvictableIdleTimeMillis: 30
validationQuery: SELECT 1
validationQueryTimeout: 10000
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
# 打开PSCache，并且指定每个连接上PSCache的大小
poolPreparedStatements: true
maxPoolPreparedStatementPerConnectionSize: 20
filters: stat,wall
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
useGlobalDataSourceStat: true
#jta相关参数配置
jta:
log-dir: classpath:tx-logs
transaction-manager-id: txManager
4、DataSourceConfig.java
package com.zzmx.springboot.atomikos.config;
import java.util.Properties;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.jta.atomikos.AtomikosDataSourceBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.core.JdbcTemplate;
@Configuration
public class DataSourceConfig {
@Bean(name = "systemDataSource")
@Primary
@Autowired
public DataSource systemDataSource(Environment env) {
AtomikosDataSourceBean ds = new AtomikosDataSourceBean();
Properties prop = build(env, "spring.datasource.druid.systemDB.");
ds.setXaDataSourceClassName("com.alibaba.druid.pool.xa.DruidXADataSource");
ds.setUniqueResourceName("systemDB");
ds.setPoolSize(5);
ds.setXaProperties(prop);
return ds;
}
@Autowired
@Bean(name = "businessDataSource")
public AtomikosDataSourceBean businessDataSource(Environment env) {
AtomikosDataSourceBean ds = new AtomikosDataSourceBean();
Properties prop = build(env, "spring.datasource.druid.businessDB.");
ds.setXaDataSourceClassName("com.alibaba.druid.pool.xa.DruidXADataSource");
ds.setUniqueResourceName("businessDB");
ds.setPoolSize(5);
ds.setXaProperties(prop);
return ds;
}
@Bean("sysJdbcTemplate")
public JdbcTemplate sysJdbcTemplate(@Qualifier("systemDataSource") DataSource ds) {
return new JdbcTemplate(ds);
}
@Bean("busJdbcTemplate")
public JdbcTemplate busJdbcTemplate(@Qualifier("businessDataSource") DataSource ds) {
return new JdbcTemplate(ds);
}
private Properties build(Environment env, String prefix) {
Properties prop = new Properties();
prop.put("url", env.getProperty(prefix + "url"));
prop.put("username", env.getProperty(prefix + "username"));
prop.put("password", env.getProperty(prefix + "password"));
prop.put("driverClassName", env.getProperty(prefix + "driverClassName", ""));
prop.put("initialSize", env.getProperty(prefix + "initialSize", Integer.class));
prop.put("maxActive", env.getProperty(prefix + "maxActive", Integer.class));
prop.put("minIdle", env.getProperty(prefix + "minIdle", Integer.class));
prop.put("maxWait", env.getProperty(prefix + "maxWait", Integer.class));
prop.put("poolPreparedStatements", env.getProperty(prefix + "poolPreparedStatements", Boolean.class));
prop.put("maxPoolPreparedStatementPerConnectionSize",
env.getProperty(prefix + "maxPoolPreparedStatementPerConnectionSize", Integer.class));
prop.put("maxPoolPreparedStatementPerConnectionSize",
env.getProperty(prefix + "maxPoolPreparedStatementPerConnectionSize", Integer.class));
prop.put("validationQuery", env.getProperty(prefix + "validationQuery"));
prop.put("validationQueryTimeout", env.getProperty(prefix + "validationQueryTimeout", Integer.class));
prop.put("testOnBorrow", env.getProperty(prefix + "testOnBorrow", Boolean.class));
prop.put("testOnReturn", env.getProperty(prefix + "testOnReturn", Boolean.class));
prop.put("testWhileIdle", env.getProperty(prefix + "testWhileIdle", Boolean.class));
prop.put("timeBetweenEvictionRunsMillis",
env.getProperty(prefix + "timeBetweenEvictionRunsMillis", Integer.class));
prop.put("minEvictableIdleTimeMillis", env.getProperty(prefix + "minEvictableIdleTimeMillis", Integer.class));
prop.put("filters", env.getProperty(prefix + "filters"));
return prop;
}
}
5、Application.java
package com.zzmx.springboot.atomikos;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import com.zzmx.springboot.atomikos.config.DataSourceConfig;
@EnableAutoConfiguration
@ComponentScan("com.zzmx.springboot.atomikos")
@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
@Import({ DataSourceConfig.class })
public class Application {
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
}
6、测试效果
根据spring boot官方文档描述，如果spring boot检测到了jta环境，会自动进行配置，故此处不需要进行事务配置，官方地址：http://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-jta.html
TransactionManagerConfig.java 是为junit测试事务而写的，由于本人对这块不太清楚，没有完成，测试暂时使用controller代替。
源码下载地址：https://github.com/zhouyuntao/springboot-atomikos