一、Dubbo服务的运行方式
1、使用Servlet容器运行(Tomcat、Jetty等)----不可取 缺点:增加复杂性(端口、管理)
tomcat/jetty等占用端口,dubbo服务也需要端口
浪费资源(内存):单独启动tomcat,jetty占用内存大
2、自建Main方法类来运行(spring容器) ----不建议(本地调试可用)
缺点: Dobbo本身提供的高级特性没用上
自已编写启动类可能会有缺陷
3、使用Dubbo框架提供的Main方法类来运行(Spring容器)----建议使用 优点:框架本身提供(com.alibaba.dubbo.container.Main)
可实现优雅关机(ShutdownHook)
注意点
- spring-context.xml
- <import resource="classpath:spring/xxx.xml" />
Dubbo是通过JDK的ShutdownHook来完成优雅停机的,所以如果用户使用"kill -9 PID"等强制关闭指令,是不会执行优雅停机的,只有通过"kill PID"时,才会执行。
原理:
服务提供方停止时,先标记为不接收新请求,新请求过来时直接报错,让客户端重试其它机器。 然后,检测线程池中的线程是否正在运行,如果有,等待所有线程执行完成,除非超时,则强制关闭。
服务消费方停止时,不再发起新的调用请求,所有新的调用在客户端即报错。然后,检测有没有请求的响应还没有返回,等待响应返回,除非超时,则强制关闭。
二、Maven构建Dubbo服务可执行Jar包的配置
- <!--MAVEN打包duboo可执行jar begin -->
- <build>
- <finalName>mydubbo-server</finalName>
- <resources>
- <resource>
- <targetPath>${project.build.directory}/classes</targetPath>
- <directory>src/main/resources</directory>
- <filtering>true</filtering>
- <includes>
- <include>**/*.xml</include>
- <include>**/*.properties</include>
- </includes>
- </resource>
- <!-- 结合com.alibaba.dubbo.container.Main -->
- <resource>
- <targetPath>${project.build.directory}/classes/META-INF/spring</targetPath>
- <directory>src/main/resources/spring</directory>
- <filtering>true</filtering>
- <includes>
- <include>spring-context.xml</include>
- </includes>
- </resource>
- </resources>
- <pluginManagement>
- <plugins>
- <!-- 解决Maven插件在Eclipse内执行了一系列的生命周期引起冲突 -->
- <plugin>
- <groupId>org.eclipse.m2e</groupId>
- <artifactId>lifecycle-mapping</artifactId>
- <version>1.0.0</version>
- <configuration>
- <lifecycleMappingMetadata>
- <pluginExecutions>
- <pluginExecution>
- <pluginExecutionFilter>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-dependency-plugin</artifactId>
- <versionRange>[2.0,)</versionRange>
- <goals>
- <goal>copy-dependencies</goal>
- </goals>
- </pluginExecutionFilter>
- <action>
- <ignore />
- </action>
- </pluginExecution>
- </pluginExecutions>
- </lifecycleMappingMetadata>
- </configuration>
- </plugin>
- </plugins>
- </pluginManagement>
- <plugins>
- <!-- 打包jar文件时,配置manifest文件,加入lib包的jar依赖 -->
- <plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-jar-plugin</artifactId>
- <configuration>
- <classesDirectory>target/classes/</classesDirectory>
- <archive>
- <manifest>
- <mainClass>com.alibaba.dubbo.container.Main</mainClass>
- <!-- 打包时 MANIFEST.MF文件不记录的时间戳版本 -->
- <useUniqueVersions>false</useUniqueVersions>
- <addClasspath>true</addClasspath>
- <classpathPrefix>lib/</classpathPrefix>
- </manifest>
- <manifestEntries>
- <Class-Path>.</Class-Path>
- </manifestEntries>
- </archive>
- </configuration>
- </plugin>
- <plugin>
- <groupId>org.apache.maven.plugins</groupId>
- <artifactId>maven-dependency-plugin</artifactId>
- <executions>
- <execution>
- <id>copy-dependencies</id>
- <phase>package</phase>
- <goals>
- <goal>copy-dependencies</goal>
- </goals>
- <configuration>
- <type>jar</type>
- <includeTypes>jar</includeTypes>
- <useUniqueVersions>false</useUniqueVersions>
- <outputDirectory>
- ${project.build.directory}/lib
- </outputDirectory>
- </configuration>
- </execution>
- </executions>
- </plugin>
- </plugins>
- </build>
- <!--MAVEN打包duboo可执行jar end -->