本篇文章给大家分享的是有关spring cloud的ConsulServer怎么用，小编觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着小编一起来看看吧。
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本文主要研究一下spring cloud的ConsulServer
ConsulServer
spring-cloud-consul-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/consul/discovery/ConsulServer.java
public class ConsulServer extends Server {
private final MetaInfo metaInfo;
private final HealthService service;
private final Map metadata;
public ConsulServer(final HealthService healthService) {
super(findHost(healthService), healthService.getService().getPort());
this.service = healthService;
this.metadata = ConsulServerUtils.getMetadata(this.service);
this.metaInfo = new MetaInfo() {
@Override
public String getAppName() {
return ConsulServer.this.service.getService().getService();
}
@Override
public String getServerGroup() {
return getMetadata().get("group");
}
@Override
public String getServiceIdForDiscovery() {
return null;
}
@Override
public String getInstanceId() {
return ConsulServer.this.service.getService().getId();
}
};
setAlive(isPassingChecks());
}
@Override
public MetaInfo getMetaInfo() {
return this.metaInfo;
}
public HealthService getHealthService() {
return this.service;
}
public Map getMetadata() {
return this.metadata;
}
public boolean isPassingChecks() {
for (Check check : this.service.getChecks()) {
if (check.getStatus() != Check.CheckStatus.PASSING) {
return false;
}
}
return true;
}
}ConsulServerList
spring-cloud-consul-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/consul/discovery/ConsulServerList.java
public class ConsulServerList extends AbstractServerList {
private final ConsulClient client;
private final ConsulDiscoveryProperties properties;
private String serviceId;
public ConsulServerList(ConsulClient client, ConsulDiscoveryProperties properties) {
this.client = client;
this.properties = properties;
}
protected ConsulClient getClient() {
return this.client;
}
protected ConsulDiscoveryProperties getProperties() {
return this.properties;
}
protected String getServiceId() {
return this.serviceId;
}
@Override
public void initWithNiwsConfig(IClientConfig clientConfig) {
this.serviceId = clientConfig.getClientName();
}
@Override
public List getInitialListOfServers() {
return getServers();
}
@Override
public List getUpdatedListOfServers() {
return getServers();
}
private List getServers() {
if (this.client == null) {
return Collections.emptyList();
}
String tag = getTag(); // null is ok
Response> response = this.client.getHealthServices(
this.serviceId, tag, this.properties.isQueryPassing(),
createQueryParamsForClientRequest(), this.properties.getAclToken());
if (response.getValue() == null || response.getValue().isEmpty()) {
return Collections.emptyList();
}
return transformResponse(response.getValue());
}
/**
* Transforms the response from Consul in to a list of usable {@link ConsulServer}s.
* @param healthServices the initial list of servers from Consul. Guaranteed to be
* non-empty list
* @return ConsulServer instances
* @see ConsulServer#ConsulServer(HealthService)
*/
protected List transformResponse(List healthServices) {
List servers = new ArrayList<>();
for (HealthService service : healthServices) {
ConsulServer server = new ConsulServer(service);
if (server.getMetadata()
.containsKey(this.properties.getDefaultZoneMetadataName())) {
server.setZone(server.getMetadata()
.get(this.properties.getDefaultZoneMetadataName()));
}
servers.add(server);
}
return servers;
}
/**
* This method will create the {@link QueryParams} to use when retrieving the services
* from Consul. By default {@link QueryParams#DEFAULT} is used. In case a datacenter
* is specified for the current serviceId {@link QueryParams#datacenter} is set.
* @return an instance of {@link QueryParams}
*/
protected QueryParams createQueryParamsForClientRequest() {
String datacenter = getDatacenter();
if (datacenter != null) {
return new QueryParams(datacenter);
}
return QueryParams.DEFAULT;
}
protected String getTag() {
return this.properties.getQueryTagForService(this.serviceId);
}
protected String getDatacenter() {
return this.properties.getDatacenters().get(this.serviceId);
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("ConsulServerList{");
sb.append("serviceId='").append(this.serviceId).append('\'');
sb.append(", tag=").append(getTag());
sb.append('}');
return sb.toString();
}
}
ConsulRibbonClientConfiguration
spring-cloud-consul-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/consul/discovery/ConsulRibbonClientConfiguration.java
@Configuration
public class ConsulRibbonClientConfiguration {
protected static final String VALUE_NOT_SET = "__not__set__";
protected static final String DEFAULT_NAMESPACE = "ribbon";
@Autowired
private ConsulClient client;
@Value("${ribbon.client.name}")
private String serviceId = "client";
public ConsulRibbonClientConfiguration() {
}
public ConsulRibbonClientConfiguration(String serviceId) {
this.serviceId = serviceId;
}
@Bean
@ConditionalOnMissingBean
public ServerList ribbonServerList(IClientConfig config,
ConsulDiscoveryProperties properties) {
ConsulServerList serverList = new ConsulServerList(this.client, properties);
serverList.initWithNiwsConfig(config);
return serverList;
}
@Bean
@ConditionalOnMissingBean
public ServerListFilter ribbonServerListFilter() {
return new HealthServiceServerListFilter();
}
@Bean
@ConditionalOnMissingBean
public IPing ribbonPing() {
return new ConsulPing();
}
@Bean
@ConditionalOnMissingBean
public ConsulServerIntrospector serverIntrospector() {
return new ConsulServerIntrospector();
}
@PostConstruct
public void preprocess() {
setProp(this.serviceId, DeploymentContextBasedVipAddresses.key(), this.serviceId);
setProp(this.serviceId, EnableZoneAffinity.key(), "true");
}
protected void setProp(String serviceId, String suffix, String value) {
// how to set the namespace properly?
String key = getKey(serviceId, suffix);
DynamicStringProperty property = getProperty(key);
if (property.get().equals(VALUE_NOT_SET)) {
ConfigurationManager.getConfigInstance().setProperty(key, value);
}
}
protected DynamicStringProperty getProperty(String key) {
return DynamicPropertyFactory.getInstance().getStringProperty(key, VALUE_NOT_SET);
}
protected String getKey(String serviceId, String suffix) {
return serviceId + "." + DEFAULT_NAMESPACE + "." + suffix;
}
}小结
ConsulServer继承了com.netflix.loadbalancer.Server；其构造器会调用isPassingChecks方法来setAlive，它通过HealthService来获取checks的状态
ConsulServerList继承了com.netflix.loadbalancer.AbstractServerList；其getInitialListOfServers及getUpdatedListOfServers方法都会调用getServers方法；它通过ConsulClient.getHealthServices来获取指定serviceId的HealthService列表，然后通过transformResponse方法包装为ConsulServer列表
ConsulRibbonClientConfiguration注入了ribbonServerList，其创建的是ConsulServerList
doc
以上就是spring cloud的ConsulServer怎么用，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注创新互联行业资讯频道。
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