java 服务降级开关设计思路 - 程序员之路 - 博客频道 - CSDN.NET
java 服务屏蔽开关系统，可以手工降级服务，关闭服务 基于spring AOP机制，可以在特殊情况下屏蔽相关service类的某些返回，并且支持定义默认返回结果，随机屏蔽某些异常服务。 通过启动一个内置的http server来监听外部指令。
对当前应用的影响。代码请查看 https://github.com/zhwj184/autoswitch
使用指南：
1.在spring配置文件中添加如下，其中switch-service-pointcut是添加紧急情况下需要屏蔽的方法列表
- <aop:config proxy-target-class="true"></aop:config>
- <bean id="switchInteceptor" class="org.autoswitch.SwitchInteceptor">
- </bean>
- <bean id="switch-service-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut">
- <property name="patterns">
- <list>
- <value>org.autoswitch.test.*</value>
- </list>
- </property>
- </bean>
- <aop:config>
- <aop:advisor advice-ref="switchInteceptor" pointcut-ref="switch-service-pointcut"/>
- </aop:config>
- <bean id="wwitchControlHttpServer" class="org.autoswitch.SwitchControlHttpServer" init-method="init"></bean>
- <bean id="testService" class="org.autoswitch.test.TestServiceImpl" />
- <bean id="testController" class="org.autoswitch.test.TestController" />
例如下面的service，上面注释分别是在应用启动后手工屏蔽该服务调用，以后每次调用直接用参数的jsonResult反序列后返回， classmethod是具体到某个方法名称，status为open关闭该服务，close表示重新打开服务，jsonResult是mock返回结果的json串， 如果是基本类型，则必须用ret作为key，其他list，bean之类的就直接用json串，type表示如果list有泛型的话则是返回的类完整类型；
- public class TestServiceImpl implements TestService{
- //http://localhost:8080/control/a.htm?classmethod=org.autoswitch.test.TestServiceImpl.hello&status=open&jsonResult=1
- public void hello(){
- System.out.println("hello");
- }
- //http://localhost:8080/control/a.htm?classmethod=org.autoswitch.test.TestServiceImpl.sayHello&status=open&jsonResult={ret:%22goodbuy%22}
- public String sayHello(){
- return "sayHello";
- }
- //http://localhost:8080/control/a.htm?classmethod=org.autoswitch.test.TestServiceImpl.getNames&status=open&jsonResult=[{"catList":[],"id":1,"name":"aaa"},{"catList":[],"id":1,"name":"aaa"},{"catList":[],"id":1,"name":"aaa"}]&type=org.autoswitch.test.TestBean
- public List<TestBean> getNames(){
- return null;
- }
- <span data-mce-style="color: #333333; font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 12px;" style="color: rgb(51, 51, 51); font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 12px;">// http://localhost:8080/control/a.htm?classmethod=org.autoswitch.test.TestServiceImpl.getBeans&status=open&jsonResult={"catList":["123","456","789"],"id":1,"name":"aaa"} public TestBean getBeans(){ return null; }</span><span data-mce-style="color: #333333; font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 12px;" style="color: rgb(51, 51, 51); font-family: Helvetica, arial, freesans, clean, sans-serif; font-size: 12px;">}</span>
3调用示例代码
- public class MainTest {
- public static void main(String[] args) {
- ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath*:spring-bean.xml");
- TestService testControl = (TestService) context.getBean("testService");
- try{
- testControl.hello();
- System.out.println(testControl.sayHello());
- List<TestBean> list = testControl.getNames();
- for(TestBean bean: list){
- System.out.println(bean.getId() + bean.getName() + bean.getCatList());
- }
- TestBean bean = testControl.getBeans();
- System.out.println(bean.getId() + bean.getName() + bean.getCatList());
- }catch(Exception e){}
- for(int i = 0; i < 10; i++){
- try{
- // testControl.hello();
- System.out.println(testControl.sayHello());
- // List<TestBean> list = testControl.getNames();
- // for(TestBean bean: list){
- // System.out.println(bean.getId() + bean.getName() + bean.getCatList());
- // }
- // TestBean bean = testControl.getBeans();
- // System.out.println(bean.getId() + bean.getName() + bean.getCatList());
- }catch(Exception e){
- e.printStackTrace();
- }
- }
- }
- }
4.输出
- Listening on port 8080
- hello
- sayHello
- Incoming connection from /127.0.0.1
- New connection thread
- goodbuy
- goodbuy
- Incoming connection from /127.0.0.1
- New connection thread
- sayHello
- sayHello
- sayHello
- sayHello
- sayHello
- sayHello
- sayHello
- sayHello
这里只是提供一种示例，如果要在生产环境中使用，则需要对并发控制，返回结果的序列化，方法名称一致参数不一致等各种情况进行控制， 同时还需要对权限，后台管理系统等可以做优化。