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本篇文章为大家展示了如何理解ZookeeperDiscoveryAutoConfiguration，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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主要研究一下ZookeeperDiscoveryAutoConfiguration
spring-cloud-zookeeper-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/zookeeper/discovery/ZookeeperDiscoveryAutoConfiguration.java
@Configuration
@ConditionalOnBean(ZookeeperDiscoveryClientConfiguration.Marker.class)
@ConditionalOnZookeeperDiscoveryEnabled
@AutoConfigureBefore({ CommonsClientAutoConfiguration.class,
NoopDiscoveryClientAutoConfiguration.class })
@AutoConfigureAfter({ ZookeeperDiscoveryClientConfiguration.class })
public class ZookeeperDiscoveryAutoConfiguration {
@Autowired(required = false)
private ZookeeperDependencies zookeeperDependencies;
@Autowired
private CuratorFramework curator;
@Bean
@ConditionalOnMissingBean
public ZookeeperDiscoveryProperties zookeeperDiscoveryProperties(
InetUtils inetUtils) {
return new ZookeeperDiscoveryProperties(inetUtils);
}
@Bean
@ConditionalOnMissingBean
// currently means auto-registration is false. That will change when
// ZookeeperServiceDiscovery is gone
public ZookeeperDiscoveryClient zookeeperDiscoveryClient(
ServiceDiscovery serviceDiscovery,
ZookeeperDiscoveryProperties zookeeperDiscoveryProperties) {
return new ZookeeperDiscoveryClient(serviceDiscovery, this.zookeeperDependencies,
zookeeperDiscoveryProperties);
}
@Bean
public ZookeeperServiceWatch zookeeperServiceWatch(
ZookeeperDiscoveryProperties zookeeperDiscoveryProperties) {
return new ZookeeperServiceWatch(this.curator, zookeeperDiscoveryProperties);
}
@Configuration
@ConditionalOnEnabledHealthIndicator("zookeeper")
@ConditionalOnClass(Endpoint.class)
protected static class ZookeeperDiscoveryHealthConfig {
@Autowired(required = false)
private ZookeeperDependencies zookeeperDependencies;
@Bean
@ConditionalOnMissingBean
public ZookeeperDiscoveryHealthIndicator zookeeperDiscoveryHealthIndicator(
CuratorFramework curatorFramework,
ServiceDiscovery serviceDiscovery,
ZookeeperDiscoveryProperties properties) {
return new ZookeeperDiscoveryHealthIndicator(curatorFramework,
serviceDiscovery, this.zookeeperDependencies, properties);
}
}
} ZookeeperDiscoveryAutoConfiguration注册了ZookeeperDiscoveryProperties、ZookeeperDiscoveryClient、ZookeeperServiceWatch、ZookeeperDiscoveryHealthIndicator
spring-cloud-zookeeper-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/zookeeper/discovery/ZookeeperDiscoveryProperties.java
@ConfigurationProperties("spring.cloud.zookeeper.discovery")
public class ZookeeperDiscoveryProperties {
/**
* Default URI spec.
*/
public static final String DEFAULT_URI_SPEC = "{scheme}://{address}:{port}";
private InetUtils.HostInfo hostInfo;
private boolean enabled = true;
/**
* Root Zookeeper folder in which all instances are registered.
*/
private String root = "/services";
/**
* The URI specification to resolve during service registration in Zookeeper.
*/
private String uriSpec = DEFAULT_URI_SPEC;
/** Id used to register with zookeeper. Defaults to a random UUID. */
private String instanceId;
/**
* Predefined host with which a service can register itself in Zookeeper. Corresponds
* to the {code address} from the URI spec.
*/
private String instanceHost;
/**
* IP address to use when accessing service (must also set preferIpAddress to use).
*/
private String instanceIpAddress;
/**
* Use ip address rather than hostname during registration.
*/
private boolean preferIpAddress = false;
/** Port to register the service under (defaults to listening port). */
private Integer instancePort;
/** Ssl port of the registered service. */
private Integer instanceSslPort;
/**
* Register as a service in zookeeper.
*/
private boolean register = true;
/**
* Gets the metadata name/value pairs associated with this instance. This information
* is sent to zookeeper and can be used by other instances.
*/
private Map metadata = new HashMap<>();
/**
* The initial status of this instance (defaults to
* {@link StatusConstants#STATUS_UP}).
*/
private String initialStatus = StatusConstants.STATUS_UP;
/**
* Order of the discovery client used by `CompositeDiscoveryClient` for sorting
* available clients.
*/
private int order = 0;
//......
} ZookeeperDiscoveryProperties定义了enabled、root、uriSpec、instanceId、instanceHost、instanceIpAddress、preferIpAddress、instancePort、instanceSslPort、register、metadata、initialStatus、order属性
spring-cloud-zookeeper-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/zookeeper/discovery/ZookeeperDiscoveryClient.java
public class ZookeeperDiscoveryClient implements DiscoveryClient {
private static final Log log = LogFactory.getLog(ZookeeperDiscoveryClient.class);
private final ZookeeperDependencies zookeeperDependencies;
private final ServiceDiscovery serviceDiscovery;
private final ZookeeperDiscoveryProperties zookeeperDiscoveryProperties;
public ZookeeperDiscoveryClient(ServiceDiscovery serviceDiscovery,
ZookeeperDependencies zookeeperDependencies,
ZookeeperDiscoveryProperties zookeeperDiscoveryProperties) {
this.serviceDiscovery = serviceDiscovery;
this.zookeeperDependencies = zookeeperDependencies;
this.zookeeperDiscoveryProperties = zookeeperDiscoveryProperties;
}
@Override
public String description() {
return "Spring Cloud Zookeeper Discovery Client";
}
private static org.springframework.cloud.client.ServiceInstance createServiceInstance(
String serviceId, ServiceInstance serviceInstance) {
return new ZookeeperServiceInstance(serviceId, serviceInstance);
}
@Override
public List getInstances(
final String serviceId) {
try {
if (getServiceDiscovery() == null) {
return Collections.EMPTY_LIST;
}
String serviceIdToQuery = getServiceIdToQuery(serviceId);
Collection> zkInstances = getServiceDiscovery()
.queryForInstances(serviceIdToQuery);
List instances = new ArrayList<>();
for (ServiceInstance instance : zkInstances) {
instances.add(createServiceInstance(serviceIdToQuery, instance));
}
return instances;
}
catch (KeeperException.NoNodeException e) {
if (log.isDebugEnabled()) {
log.debug(
"Error getting instances from zookeeper. Possibly, no service has registered.",
e);
}
// this means that nothing has registered as a service yes
return Collections.emptyList();
}
catch (Exception exception) {
rethrowRuntimeException(exception);
}
return new ArrayList<>();
}
private ServiceDiscovery getServiceDiscovery() {
return this.serviceDiscovery;
}
private String getServiceIdToQuery(String serviceId) {
if (this.zookeeperDependencies != null
&& this.zookeeperDependencies.hasDependencies()) {
String pathForAlias = this.zookeeperDependencies.getPathForAlias(serviceId);
return pathForAlias.isEmpty() ? serviceId : pathForAlias;
}
return serviceId;
}
@Override
public List getServices() {
List services = null;
if (getServiceDiscovery() == null) {
log.warn(
"Service Discovery is not yet ready - returning empty list of services");
return Collections.emptyList();
}
try {
Collection names = getServiceDiscovery().queryForNames();
if (names == null) {
return Collections.emptyList();
}
services = new ArrayList<>(names);
}
catch (KeeperException.NoNodeException e) {
if (log.isDebugEnabled()) {
log.debug(
"Error getting services from zookeeper. Possibly, no service has registered.",
e);
}
// this means that nothing has registered as a service yes
return Collections.emptyList();
}
catch (Exception e) {
rethrowRuntimeException(e);
}
return services;
}
@Override
public int getOrder() {
return this.zookeeperDiscoveryProperties.getOrder();
}
} ZookeeperDiscoveryClient实现了org.springframework.cloud.client.discovery.DiscoveryClient接口，其getInstances使用curator的ServiceDiscovery.queryForInstances获取服务实例信息，然后转换为org.springframework.cloud.client.ServiceInstance类型；getServices则是使用curator的ServiceDiscovery.queryForNames获取服务名信息
spring-cloud-zookeeper-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/zookeeper/discovery/ZookeeperServiceWatch.java
