The principle and function of MetadataReportService in dubbo
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This paper mainly studies the MetadataReportService of dubbo.
MetadataReportService
Dubbo-2.7.2/dubbo-metadata-report/dubbo-metadata-report-api/src/main/java/org/apache/dubbo/metadata/integration/MetadataReportService.java
Public class MetadataReportService {protected final Logger logger = LoggerFactory.getLogger (getClass ()); private static volatile MetadataReportService metadataReportService; private static Object lock = new Object (); private MetadataReportFactory metadataReportFactory = ExtensionLoader.getExtensionLoader (MetadataReportFactory.class). GetAdaptiveExtension (); MetadataReport metadataReport; URL metadataReportUrl; MetadataReportService (URL metadataReportURL) {if (METADATA_REPORT_KEY.equals (metadataReportURL.getProtocol () {String protocol = metadataReportURL.getParameter (METADATA_REPORT_KEY, DEFAULT_DIRECTORY) MetadataReportURL = URLBuilder.from (metadataReportURL) .setProtocol (protocol) .removeParameter (METADATA_REPORT_KEY) .build ();} this.metadataReportUrl = metadataReportURL; metadataReport = metadataReportFactory.getMetadataReport (this.metadataReportUrl) } public static MetadataReportService instance (Supplier metadataReportUrl) {if (metadataReportService = = null) {synchronized (lock) {if (metadataReportService = = null) {URL metadataReportURLTmp = metadataReportUrl.get (); if (metadataReportURLTmp = = null) {return null } metadataReportService = new MetadataReportService (metadataReportURLTmp);} return metadataReportService;} public void publishProvider (URL providerUrl) throws RpcException {/ / first add into the list / / remove the individul param providerUrl = providerUrl.removeParameters (PID_KEY, TIMESTAMP_KEY, Constants.BIND_IP_KEY, Constants.BIND_PORT_KEY, TIMESTAMP_KEY) Try {String interfaceName = providerUrl.getParameter (INTERFACE_KEY); if (StringUtils.isNotEmpty (interfaceName)) {Class interfaceClass = Class.forName (interfaceName); FullServiceDefinition fullServiceDefinition = ServiceDefinitionBuilder.buildFullDefinition (interfaceClass, providerUrl.getParameters ()) MetadataReport.storeProviderMetadata (new MetadataIdentifier (providerUrl.getServiceInterface (), providerUrl.getParameter (VERSION_KEY), providerUrl.getParameter (GROUP_KEY), PROVIDER_SIDE, providerUrl.getParameter (APPLICATION_KEY)), fullServiceDefinition); return;} logger.error ("publishProvider interfaceName is empty. ProviderUrl: "+ providerUrl.toFullString ();} catch (ClassNotFoundException e) {/ / ignore error logger.error (" publishProvider getServiceDescriptor error. ProviderUrl: "+ providerUrl.toFullString (), e);}} public void publishConsumer (URL consumerURL) throws RpcException {consumerURL = consumerURL.removeParameters (PID_KEY, TIMESTAMP_KEY, Constants.BIND_IP_KEY, Constants.BIND_PORT_KEY, TIMESTAMP_KEY) MetadataReport.storeConsumerMetadata (new MetadataIdentifier (consumerURL.getServiceInterface (), consumerURL.getParameter (VERSION_KEY), consumerURL.getParameter (GROUP_KEY), CONSUMER_SIDE, consumerURL.getParameter (APPLICATION_KEY)), consumerURL.getParameters ();}}
The constructor of MetadataReportService acquires the corresponding MetadataReport; through metadataReportURL, which defines that the publishProvider method is mainly to execute the metadataReport.storeProviderMetadata method, and that the publishConsumer method is mainly to execute the metadataReport.storeConsumerMetadata method. It also provides a static method to create the MetadataReportService using the singleton mode with double locks.
Example
Dubbo-2.7.2/dubbo-metadata-report/dubbo-metadata-report-api/src/test/java/org/apache/dubbo/metadata/integration/MetadataReportServiceTest.java
Public class MetadataReportServiceTest {URL url = URL.valueOf ("JTest://" + NetUtils.getLocalAddress () .getHostName () + ": 4444/org.apache.dubbo.TestService?version=1.0.0&application=vic"); MetadataReportService metadataReportService1; @ BeforeEach public void before () {metadataReportService1 = MetadataReportService.instance (()-> url) } @ Test public void testInstance () {MetadataReportService metadataReportService2 = MetadataReportService.instance (new Supplier () {@ Override public URL get () {return url;}}); Assertions.assertSame (metadataReportService1, metadataReportService2); Assertions.assertEquals (metadataReportService1.metadataReportUrl, url) } @ Test public void testPublishProviderNoInterfaceName () {URL publishUrl = URL.valueOf ("dubbo://" + NetUtils.getLocalAddress (). GetHostName () + ": 4444/org.apache.dubbo.TestService?version=1.0.0&application=vicpubprovder&side=provider"); metadataReportService1.publishProvider (publishUrl); Assertions.assertTrue (metadataReportService1.metadataReport instanceof JTestMetadataReport4Test); JTestMetadataReport4Test jTestMetadataReport4Test = (JTestMetadataReport4Test) metadataReportService1.metadataReport; Assertions.assertTrue (! jTestMetadataReport4Test.store.containsKey (JTestMetadataReport4Test.getProviderKey (publishUrl) } @ Test public void testPublishProviderWrongInterface () {URL publishUrl = URL.valueOf ("dubbo://" + NetUtils.getLocalAddress () .getHostName () + ": 4444/org.apache.dubbo.TestService?version=1.0.0&application=vicpu&interface=ccc&side=provider"); metadataReportService1.publishProvider (publishUrl); Assertions.assertTrue (metadataReportService1.metadataReport instanceof JTestMetadataReport4Test); JTestMetadataReport4Test jTestMetadataReport4Test = (JTestMetadataReport4Test) metadataReportService1.metadataReport Assertions.assertTrue (! jTestMetadataReport4Test.store.containsKey (JTestMetadataReport4Test.getProviderKey (publishUrl);} @ Test public void testPublishProviderContainInterface () throws InterruptedException {URL publishUrl = URL.valueOf ("dubbo://" + NetUtils.getLocalAddress () .getHostName () + ": 4444/org.apache.dubbo.TestService?version=1.0.3&application=vicpubp&interface=org.apache.dubbo.metadata.integration.InterfaceNameTestService&side=provider"); metadataReportService1.publishProvider (publishUrl); Thread.sleep Assertions.assertTrue (metadataReportService1.metadataReport instanceof JTestMetadataReport4Test); JTestMetadataReport4Test jTestMetadataReport4Test = (JTestMetadataReport4Test) metadataReportService1.metadataReport; Assertions.assertTrue (jTestMetadataReport4Test.store.containsKey (JTestMetadataReport4Test.getProviderKey (publishUrl); String value = jTestMetadataReport4Test.store.get (JTestMetadataReport4Test.getProviderKey (publishUrl)); FullServiceDefinition fullServiceDefinition = toServiceDefinition (value); Map map = fullServiceDefinition.getParameters (); Assertions.assertEquals (map.get ("application"), "vicpubp") Assertions.assertEquals (map.get ("version"), "1.0.3"); Assertions.assertEquals (map.get ("interface"), "org.apache.dubbo.metadata.integration.InterfaceNameTestService");} @ Test public void testPublishConsumer () throws InterruptedException {URL publishUrl = URL.valueOf ("dubbo://" + NetUtils.getLocalAddress (). GetHostName () + ": 4444/org.apache.dubbo.TestService?version=1.0.x&application=vicpubconsumer&side=consumer") MetadataReportService1.publishConsumer (publishUrl); Thread.sleep (300); Assertions.assertTrue (metadataReportService1.metadataReport instanceof JTestMetadataReport4Test); JTestMetadataReport4Test jTestMetadataReport4Test = (JTestMetadataReport4Test) metadataReportService1.metadataReport; Assertions.assertTrue (jTestMetadataReport4Test.store.containsKey (JTestMetadataReport4Test.getConsumerKey (publishUrl); String value = jTestMetadataReport4Test.store.get (JTestMetadataReport4Test.getConsumerKey (publishUrl)); Gson gson = new Gson (); Map map = gson.fromJson (value, Map.class) Assertions.assertEquals (map.get ("application"), "vicpubconsumer"); Assertions.assertEquals (map.get ("version"), "1.0.x");} private FullServiceDefinition toServiceDefinition (String urlQuery) {Gson gson = new Gson (); return gson.fromJson (urlQuery, FullServiceDefinition.class);}}
The testInstance method here validates the singleton pattern, then verifies the scenarios of noInterfaceName, wrongInterface, containInterface for publishProvider, and finally verifies publishConsumer.
Summary
The constructor of MetadataReportService acquires the corresponding MetadataReport; through metadataReportURL, which defines that the publishProvider method is mainly to execute the metadataReport.storeProviderMetadata method, and that the publishConsumer method is mainly to execute the metadataReport.storeConsumerMetadata method. It also provides a static method to create the MetadataReportService using the singleton mode with double locks.
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