本篇内容介绍了“dubbo中MetadataReportService的原理及作用”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
本文主要研究一下dubbo的MetadataReportService
dubbo-2.7.2/dubbo-metadata-report/dubbo-metadata-report-api/src/main/java/org/apache/dubbo/metadata/integration/MetadataReportService.java
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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<URL> 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());
}
}MetadataReportService的构造器通过metadataReportURL来获取对应的MetadataReport；它定义了publishProvider方法主要是执行metadataReport.storeProviderMetadata方法；还定义了publishConsumer方法主要是执行metadataReport.storeConsumerMetadata方法；同时还提供了一个静态方法使用双重检锁的单例模式创建MetadataReportService
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<URL>() {
@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(300);
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<String,String> 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<String, String> 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);
}
}这里的testInstance方法验证了单例模式；之后对publishProvider验证了noInterfaceName、wrongInterface、containInterface的场景；最后验证了publishConsumer
MetadataReportService的构造器通过metadataReportURL来获取对应的MetadataReport；它定义了publishProvider方法主要是执行metadataReport.storeProviderMetadata方法；还定义了publishConsumer方法主要是执行metadataReport.storeConsumerMetadata方法；同时还提供了一个静态方法使用双重检锁的单例模式创建MetadataReportService
“dubbo中MetadataReportService的原理及作用”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注亿速云网站，小编将为大家输出更多高质量的实用文章！
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原文链接：https://my.oschina.net/go4it/blog/3069863
