Dubbo的@Reference和@Service说明

前言

@Reference 用在消费端，表明使用的是服务端的什么服务

 1 @RestController2 public class RemoteUserController {3 4 5 6     @Reference(version = "1.0.0",check = true)7     private RemoteUserService remoteUserService;8 9
10
11     @RequestMapping(value="/dubbo/say/{name}")
12     public String sayHello(@PathVariable("name") String name){
13         //调用服务提供者的服务
14         String result=remoteUserService.sayHello(name);
15         return result;
16     }
17 }

@Service 用在服务提供者中，在类或者接口中声明。

服务提供者实现相关的服务接口，当消费端调用相关的类时，最终会调用提供者的实现方法。

@Component
@Service(version = "1.0.0",timeout = 10000,interfaceClass = RemoteUserService.class)
public class RemoteUserServiceImpl implements RemoteUserService {@Overridepublic String sayHello(String name) {log.info("访问sayHello " + name);return "Hello " + name;}
}

@Reference

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD, ElementType.ANNOTATION_TYPE})
public @interface Reference {/*** Interface class, default value is void.class*/Class<?> interfaceClass() default void.class;/*** Interface class name, default value is empty string*/String interfaceName() default "";/*** Service version, default value is empty string*/String version() default "";/*** Service group, default value is empty string*/String group() default "";/*** Service target URL for direct invocation, if this is specified, then registry center takes no effect.* 不使用注册中心，消费者和提供者直连，url="dubbo://localhost:20890" */String url() default "";/*** Client transport type, default value is "netty"*/String client() default "";/*** Whether to enable generic invocation, default value is false*/boolean generic() default false;/*** When enable, prefer to call local service in the same JVM if it's present, default value is true*/boolean injvm() default true;/*** Check if service provider is available during boot up, default value is true*/boolean check() default true;/*** Whether eager initialize the reference bean when all properties are set, default value is false*/boolean init() default false;/*** Whether to make connection when the client is created, the default value is false*/boolean lazy() default false;/*** Export an stub service for event dispatch, default value is false.** @see Constants#STUB_EVENT_METHODS_KEY*/boolean stubevent() default false;/*** Whether to reconnect if connection is lost, if not specify, reconnect is enabled by default, and the interval* for retry connecting is 2000 ms** @see Constants#DEFAULT_RECONNECT_PERIOD*/String reconnect() default "";/*** Whether to stick to the same node in the cluster, the default value is false** @see Constants#DEFAULT_CLUSTER_STICKY*/boolean sticky() default false;/*** How the proxy is generated, legal values include: jdk, javassist*/String proxy() default "";/*** Service stub name, use interface name + Local if not set*/String stub() default "";/*** Cluster strategy, legal values include: failover, failfast, failsafe, failback, forking*/String cluster() default "";/*** Maximum connections service provider can accept, default value is 0 - connection is shared*/int connections() default 0;/*** The callback instance limit peer connection** @see Constants#DEFAULT_CALLBACK_INSTANCES*/int callbacks() default 0;/*** Callback method name when connected, default value is empty string*/String onconnect() default "";/*** Callback method name when disconnected, default value is empty string*/String ondisconnect() default "";/*** Service owner, default value is empty string*/String owner() default "";/*** Service layer, default value is empty string*/String layer() default "";/*** Service invocation retry times** @see Constants#DEFAULT_RETRIES*/int retries() default 2;/*** Load balance strategy, legal values include: random, roundrobin, leastactive** @see Constants#DEFAULT_LOADBALANCE*/String loadbalance() default "";/*** Whether to enable async invocation, default value is false*/boolean async() default false;/*** Maximum active requests allowed, default value is 0*/int actives() default 0;/*** Whether the async request has already been sent, the default value is false*/boolean sent() default false;/*** Service mock name, use interface name + Mock if not set*/String mock() default "";/*** Whether to use JSR303 validation, legal values are: true, false*/String validation() default "";/*** Timeout value for service invocation, default value is 0*/int timeout() default 0;/*** Specify cache implementation for service invocation, legal values include: lru, threadlocal, jcache*/String cache() default "";/*** Filters for service invocation** @see Filter*/String[] filter() default {};/*** Listeners for service exporting and unexporting** @see ExporterListener*/String[] listener() default {};/*** Customized parameter key-value pair, for example: {key1, value1, key2, value2}*/String[] parameters() default {};/*** Application spring bean name*/String application() default "";/*** Module spring bean name*/String module() default "";/*** Consumer spring bean name*/String consumer() default "";/*** Monitor spring bean name*/String monitor() default "";/*** Registry spring bean name*/String[] registry() default {};/*** Protocol spring bean names*/String protocol() default "";/*** methods support* @return*/Method[] methods() default {};
}

@Service

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
@Inherited
public @interface Service {/*** Interface class, default value is void.class*/Class<?> interfaceClass() default void.class;/*** Interface class name, default value is empty string*/String interfaceName() default "";/*** Service version, default value is empty string*/String version() default "";/*** Service group, default value is empty string*/String group() default "";/*** Service path, default value is empty string*/String path() default "";/*** Whether to export service, default value is true*/boolean export() default true;/*** Service token, default value is false*/String token() default "";/*** Whether the service is deprecated, default value is false*/boolean deprecated() default false;/*** Whether the service is dynamic, default value is false*/boolean dynamic() default false;/*** Access log for the service, default value is ""*/String accesslog() default "";/*** Maximum concurrent executes for the service, default value is 0 - no limits*/int executes() default 0;/*** Whether to register the service to register center, default value is true*/boolean register() default true;/*** Service weight value, default value is 0*/int weight() default 0;/*** Service doc, default value is ""*/String document() default "";/*** Delay time for service registration, default value is 0*/int delay() default 0;/*** @see Service#stub()* @deprecated*/String local() default "";/*** Service stub name, use interface name + Local if not set*/String stub() default "";/*** Cluster strategy, legal values include: failover, failfast, failsafe, failback, forking*/String cluster() default "";/*** How the proxy is generated, legal values include: jdk, javassist*/String proxy() default "";/*** Maximum connections service provider can accept, default value is 0 - connection is shared*/int connections() default 0;/*** The callback instance limit peer connection** @see Constants#DEFAULT_CALLBACK_INSTANCES*/int callbacks() default Constants.DEFAULT_CALLBACK_INSTANCES;/*** Callback method name when connected, default value is empty string*/String onconnect() default "";/*** Callback method name when disconnected, default value is empty string*/String ondisconnect() default "";/*** Service owner, default value is empty string*/String owner() default "";/*** Service layer, default value is empty string*/String layer() default "";/*** Service invocation retry times** @see Constants#DEFAULT_RETRIES*/int retries() default Constants.DEFAULT_RETRIES;/*** Load balance strategy, legal values include: random, roundrobin, leastactive** @see Constants#DEFAULT_LOADBALANCE*/String loadbalance() default Constants.DEFAULT_LOADBALANCE;/*** Whether to enable async invocation, default value is false*/boolean async() default false;/*** Maximum active requests allowed, default value is 0*/int actives() default 0;/*** Whether the async request has already been sent, the default value is false*/boolean sent() default false;/*** Service mock name, use interface name + Mock if not set*/String mock() default "";/*** Whether to use JSR303 validation, legal values are: true, false*/String validation() default "";/*** Timeout value for service invocation, default value is 0*/int timeout() default 0;/*** Specify cache implementation for service invocation, legal values include: lru, threadlocal, jcache*/String cache() default "";/*** Filters for service invocation** @see Filter*/String[] filter() default {};/*** Listeners for service exporting and unexporting** @see ExporterListener*/String[] listener() default {};/*** Customized parameter key-value pair, for example: {key1, value1, key2, value2}*/String[] parameters() default {};/*** Application spring bean name*/String application() default "";/*** Module spring bean name*/String module() default "";/*** Provider spring bean name*/String provider() default "";/*** Protocol spring bean names*/String[] protocol() default {};/*** Monitor spring bean name*/String monitor() default "";/*** Registry spring bean name*/String[] registry() default {};/*** Service tag name*/String tag() default "";/*** methods support* @return*/Method[] methods() default {};
}

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Dubbo的@Reference和@Service说明

前言

@Reference

@Service

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