MetadataService (Apache Dubbo 3.2.0-beta.6 API)

```
public interface MetadataService
```
This service is used to expose the metadata information inside a Dubbo process. Typical uses include: 1. The Consumer queries the metadata information of the Provider to list the interfaces and each interface's configuration 2. The Console (dubbo-admin) queries for the metadata of a specific process, or aggregate data of all processes.

字段概要

字段
限定符和类型	字段和说明
`static String`	`ALL_SERVICE_INTERFACES` The value of All service instances
`static String`	`VERSION` The contract version of `MetadataService`, the future update must make sure compatible.

方法概要

所有方法静态方法实例方法抽象方法默认方法
限定符和类型	方法和说明
`void`	`exportInstanceMetadata(String instanceMetadata)` Export Metadata in Service Instance of Service Discovery Used for consumer to get Service Instance Metadata if Registry is unsupported with publishing metadata
`String`	`getAndListenInstanceMetadata(String consumerId, InstanceMetadataChangedListener listener)` 1.
`default Set<org.apache.dubbo.common.URL>`	`getExportedServiceURLs()`
`default SortedSet<String>`	`getExportedURLs()` Get the `sorted set` of String that presents all Dubbo exported `urls`
`default SortedSet<String>`	`getExportedURLs(String serviceInterface)` Get the `sorted set` of String that presents the specified Dubbo exported `urls` by the `serviceInterface`
`default SortedSet<String>`	`getExportedURLs(String serviceInterface, String group)` Get the `sorted set` of String that presents the specified Dubbo exported `urls` by the `serviceInterface` and `group`
`default SortedSet<String>`	`getExportedURLs(String serviceInterface, String group, String version)` Get the `sorted set` of String that presents the specified Dubbo exported `urls` by the `serviceInterface`, `group` and `version`
`SortedSet<String>`	`getExportedURLs(String serviceInterface, String group, String version, String protocol)` Get the sorted set of String that presents the specified Dubbo exported `urls` by the `serviceInterface`, `group`, `version` and `protocol`
`Map<String,InstanceMetadataChangedListener>`	`getInstanceMetadataChangedListenerMap()` Get all Metadata listener from local Used for consumer to get Service Instance Metadata if Registry is unsupported with publishing metadata
`MetadataInfo`	`getMetadataInfo(String revision)`
`List<MetadataInfo>`	`getMetadataInfos()`
`org.apache.dubbo.common.URL`	`getMetadataURL()`
`String`	`getServiceDefinition(String serviceKey)`
`default String`	`getServiceDefinition(String interfaceName, String version, String group)` Interface definition.
`default SortedSet<String>`	`getSubscribedURLs()` the list of String that presents all Dubbo subscribed `urls`
`static boolean`	`isMetadataService(String interfaceName)`
`String`	`serviceName()` Gets the current Dubbo Service name
`static SortedSet<String>`	`toSortedStrings(Iterable<org.apache.dubbo.common.URL> iterable)` Convert the specified `Iterable` of `URLs` to be the `strings` presenting the `URLs`
`static SortedSet<String>`	`toSortedStrings(Stream<org.apache.dubbo.common.URL> stream)` Convert the specified `Stream` of `URLs` to be the `strings` presenting the `URLs`
`default String`	`version()` Gets the version of `MetadataService` that always equals `VERSION`

- 字段详细资料
  - ALL_SERVICE_INTERFACES
```
static final String ALL_SERVICE_INTERFACES
```
    The value of All service instances
    
    另请参阅:
    
    常量字段值
  - VERSION
```
static final String VERSION
```
    The contract version of MetadataService, the future update must make sure compatible.
    
    另请参阅:
    
    常量字段值
- 方法详细资料
  - serviceName
```
String serviceName()
```
    Gets the current Dubbo Service name
    
    返回:
    
    non-null
  - version
```
default String version()
```
    Gets the version of MetadataService that always equals VERSION
    
    返回:
    
    non-null
    
    另请参阅:
    
    VERSION
  - getMetadataURL
```
org.apache.dubbo.common.URL getMetadataURL()
```
  - getSubscribedURLs
```
default SortedSet<String> getSubscribedURLs()
```
    the list of String that presents all Dubbo subscribed urls
    
    返回:
    
    the non-null read-only sorted set of strings presenting the URLs
    
    另请参阅:
    
    toSortedStrings(Stream), URL.toFullString()
  - getExportedURLs
```
default SortedSet<String> getExportedURLs()
```
    Get the sorted set of String that presents all Dubbo exported urls
    
    返回:
    
    the non-null read-only sorted set of strings presenting the URLs
    
    另请参阅:
    
    toSortedStrings(Stream), URL.toFullString()
  - getExportedURLs
```
default SortedSet<String> getExportedURLs(String serviceInterface)
```
    Get the sorted set of String that presents the specified Dubbo exported urls by the serviceInterface
    
    参数:
    
    serviceInterface - The class name of Dubbo service interface
    
    返回:
    
    the non-null read-only sorted set of strings presenting the URLs
    
    另请参阅:
    
    toSortedStrings(Stream), URL.toFullString()
  - getExportedURLs
```
default SortedSet<String> getExportedURLs(String serviceInterface,
                                          String group)
```
    Get the sorted set of String that presents the specified Dubbo exported urls by the serviceInterface and group
    
    参数:
    
    serviceInterface - The class name of Dubbo service interface
    
    group - the Dubbo Service Group (optional)
    
    返回:
    
    the non-null read-only sorted set of strings presenting the URLs
    
    另请参阅:
    
    toSortedStrings(Stream), URL.toFullString()
  - getExportedURLs
```
default SortedSet<String> getExportedURLs(String serviceInterface,
                                          String group,
                                          String version)
```
    Get the sorted set of String that presents the specified Dubbo exported urls by the serviceInterface, group and version
    
    参数:
    
    serviceInterface - The class name of Dubbo service interface
    
    group - the Dubbo Service Group (optional)
    
    version - the Dubbo Service Version (optional)
    
    返回:
    
    the non-null read-only sorted set of strings presenting the URLs
    
    另请参阅:
    
    toSortedStrings(Stream), URL.toFullString()
  - getExportedURLs
```
SortedSet<String> getExportedURLs(String serviceInterface,
                                  String group,
                                  String version,
                                  String protocol)
```
    Get the sorted set of String that presents the specified Dubbo exported urls by the serviceInterface, group, version and protocol
    
    参数:
    
    serviceInterface - The class name of Dubbo service interface
    
    group - the Dubbo Service Group (optional)
    
    version - the Dubbo Service Version (optional)
    
    protocol - the Dubbo Service Protocol (optional)
    
    返回:
    
    the non-null read-only sorted set of strings presenting the URLs
    
    另请参阅:
    
    toSortedStrings(Stream), URL.toFullString()
  - getExportedServiceURLs
```
default Set<org.apache.dubbo.common.URL> getExportedServiceURLs()
```
  - getServiceDefinition
```
default String getServiceDefinition(String interfaceName,
                                    String version,
                                    String group)
```
    Interface definition.
    
    返回:
  - getServiceDefinition
```
String getServiceDefinition(String serviceKey)
```
  - getMetadataInfo
```
MetadataInfo getMetadataInfo(String revision)
```
  - getMetadataInfos
```
List<MetadataInfo> getMetadataInfos()
```
  - toSortedStrings
```
static SortedSet<String> toSortedStrings(Iterable<org.apache.dubbo.common.URL> iterable)
```
    Convert the specified Iterable of URLs to be the strings presenting the URLs
    
    参数:
    
    iterable - Iterable of URL
    
    返回:
    
    the non-null read-only sorted set of strings presenting
    
    另请参阅:
    
    URL.toFullString()
  - toSortedStrings
```
static SortedSet<String> toSortedStrings(Stream<org.apache.dubbo.common.URL> stream)
```
    Convert the specified Stream of URLs to be the strings presenting the URLs
    
    参数:
    
    stream - Stream of URL
    
    返回:
    
    the non-null read-only sorted set of strings presenting
    
    另请参阅:
    
    URL.toFullString()
  - isMetadataService
```
static boolean isMetadataService(String interfaceName)
```
  - exportInstanceMetadata
```
void exportInstanceMetadata(String instanceMetadata)
```
    Export Metadata in Service Instance of Service Discovery
    Used for consumer to get Service Instance Metadata if Registry is unsupported with publishing metadata
    
    参数:
    
    instanceMetadata - Map of provider Service Instance Metadata
    
    从以下版本开始:
    
    3.0
  - getInstanceMetadataChangedListenerMap
```
Map<String,InstanceMetadataChangedListener> getInstanceMetadataChangedListenerMap()
```
    Get all Metadata listener from local
    Used for consumer to get Service Instance Metadata if Registry is unsupported with publishing metadata
    
    返回:
    
    Map of InstanceMetadataChangedListener
    
    从以下版本开始:
    
    3.0
  - getAndListenInstanceMetadata
```
String getAndListenInstanceMetadata(String consumerId,
                                    InstanceMetadataChangedListener listener)
```
    1. Fetch Metadata in Service Instance of Service Discovery 2. Add a metadata change listener
    Used for consumer to get Service Instance Metadata if Registry is unsupported with publishing metadata
    
    参数:
    
    consumerId - consumerId
    
    listener - InstanceMetadataChangedListener used to notify event
    
    返回:
    
    Map of provider Service Instance Metadata
    
    从以下版本开始:
    
    3.0

接口 MetadataService

字段概要

方法概要

字段详细资料

ALL_SERVICE_INTERFACES

VERSION

方法详细资料

serviceName

version

getMetadataURL

getSubscribedURLs

getExportedURLs

getExportedURLs

getExportedURLs

getExportedURLs

getExportedURLs

getExportedServiceURLs

getServiceDefinition

getServiceDefinition

getMetadataInfo

getMetadataInfos

toSortedStrings

toSortedStrings

isMetadataService

exportInstanceMetadata

getInstanceMetadataChangedListenerMap

getAndListenInstanceMetadata