springcloud的ConsulCatalogWatch有什么作用
本篇内容主要讲解“spring cloud的ConsulCatalogWatch有什么作用”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“spring cloud的ConsulCatalogWatch有什么作用”吧!
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本文主要研究一下spring cloud的ConsulCatalogWatch
ConsulCatalogWatch
spring-cloud-consul-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/consul/discovery/ConsulCatalogWatch.java
public class ConsulCatalogWatch
implements ApplicationEventPublisherAware, SmartLifecycle {
private static final Log log = LogFactory.getLog(ConsulDiscoveryClient.class);
private final ConsulDiscoveryProperties properties;
private final ConsulClient consul;
private final TaskScheduler taskScheduler;
private final AtomicReference catalogServicesIndex = new AtomicReference<>();
private final AtomicBoolean running = new AtomicBoolean(false);
private ApplicationEventPublisher publisher;
private ScheduledFuture watchFuture;
public ConsulCatalogWatch(ConsulDiscoveryProperties properties, ConsulClient consul) {
this(properties, consul, getTaskScheduler());
}
public ConsulCatalogWatch(ConsulDiscoveryProperties properties, ConsulClient consul,
TaskScheduler taskScheduler) {
this.properties = properties;
this.consul = consul;
this.taskScheduler = taskScheduler;
}
private static ThreadPoolTaskScheduler getTaskScheduler() {
ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
taskScheduler.initialize();
return taskScheduler;
}
@Override
public void setApplicationEventPublisher(ApplicationEventPublisher publisher) {
this.publisher = publisher;
}
@Override
public boolean isAutoStartup() {
return true;
}
@Override
public void stop(Runnable callback) {
this.stop();
callback.run();
}
@Override
public void start() {
if (this.running.compareAndSet(false, true)) {
this.watchFuture = this.taskScheduler.scheduleWithFixedDelay(
this::catalogServicesWatch,
this.properties.getCatalogServicesWatchDelay());
}
}
@Override
public void stop() {
if (this.running.compareAndSet(true, false) && this.watchFuture != null) {
this.watchFuture.cancel(true);
}
}
@Override
public boolean isRunning() {
return false;
}
@Override
public int getPhase() {
return 0;
}
@Timed("consul.watch-catalog-services")
public void catalogServicesWatch() {
try {
long index = -1;
if (this.catalogServicesIndex.get() != null) {
index = this.catalogServicesIndex.get().longValue();
}
Response>> response = this.consul.getCatalogServices(
new QueryParams(this.properties.getCatalogServicesWatchTimeout(),
index),
this.properties.getAclToken());
Long consulIndex = response.getConsulIndex();
if (consulIndex != null) {
this.catalogServicesIndex.set(BigInteger.valueOf(consulIndex));
}
if (log.isTraceEnabled()) {
log.trace("Received services update from consul: " + response.getValue()
+ ", index: " + consulIndex);
}
this.publisher.publishEvent(new HeartbeatEvent(this, consulIndex));
}
catch (Exception e) {
log.error("Error watching Consul CatalogServices", e);
}
}
} ConsulCatalogWatch构造器接收ConsulDiscoveryProperties、ConsulClient、TaskScheduler；其start方法会使用taskScheduler.scheduleWithFixedDelay注册catalogServicesWatch的定时任务；stop方法则是cancel掉这个定时任务；catalogServicesWatch方法使用consul.getCatalogServices方法获取consulIndex然后更新本地的catalogServicesIndex，发布HeartbeatEvent
ConsulDiscoveryClientConfiguration
spring-cloud-consul-discovery-2.1.2.RELEASE-sources.jar!/org/springframework/cloud/consul/discovery/ConsulDiscoveryClientConfiguration.java
@Configuration
@ConditionalOnConsulEnabled
@ConditionalOnProperty(value = "spring.cloud.consul.discovery.enabled", matchIfMissing = true)
@ConditionalOnDiscoveryEnabled
@EnableConfigurationProperties
@AutoConfigureBefore({ SimpleDiscoveryClientAutoConfiguration.class,
CommonsClientAutoConfiguration.class })
public class ConsulDiscoveryClientConfiguration {
/**
* Name of the catalog watch task scheduler bean.
*/
public static final String CATALOG_WATCH_TASK_SCHEDULER_NAME = "catalogWatchTaskScheduler";
@Autowired
private ConsulClient consulClient;
@Bean
@ConditionalOnMissingBean
@ConditionalOnProperty("spring.cloud.consul.discovery.heartbeat.enabled")
// TODO: move to service-registry for Edgware
public TtlScheduler ttlScheduler(HeartbeatProperties heartbeatProperties) {
return new TtlScheduler(heartbeatProperties, this.consulClient);
}
@Bean
@ConditionalOnMissingBean
// TODO: move to service-registry for Edgware
public HeartbeatProperties heartbeatProperties() {
return new HeartbeatProperties();
}
@Bean
@ConditionalOnMissingBean
// TODO: Split appropriate values to service-registry for Edgware
public ConsulDiscoveryProperties consulDiscoveryProperties(InetUtils inetUtils) {
return new ConsulDiscoveryProperties(inetUtils);
}
@Bean
@ConditionalOnMissingBean
public ConsulDiscoveryClient consulDiscoveryClient(
ConsulDiscoveryProperties discoveryProperties) {
return new ConsulDiscoveryClient(this.consulClient, discoveryProperties);
}
@Bean
@ConditionalOnMissingBean
@ConditionalOnProperty(name = "spring.cloud.consul.discovery.catalog-services-watch.enabled", matchIfMissing = true)
public ConsulCatalogWatch consulCatalogWatch(
ConsulDiscoveryProperties discoveryProperties,
@Qualifier(CATALOG_WATCH_TASK_SCHEDULER_NAME) TaskScheduler taskScheduler) {
return new ConsulCatalogWatch(discoveryProperties, this.consulClient,
taskScheduler);
}
@Bean(name = CATALOG_WATCH_TASK_SCHEDULER_NAME)
@ConditionalOnProperty(name = "spring.cloud.consul.discovery.catalog-services-watch.enabled", matchIfMissing = true)
public TaskScheduler catalogWatchTaskScheduler() {
return new ThreadPoolTaskScheduler();
}
}ConsulDiscoveryClientConfiguration会注册ConsulCatalogWatch，其使用了名为catalogWatchTaskScheduler的taskScheduler；这里创建的是ThreadPoolTaskScheduler
小结
ConsulCatalogWatch构造器接收ConsulDiscoveryProperties、ConsulClient、TaskScheduler；其start方法会使用taskScheduler.scheduleWithFixedDelay注册catalogServicesWatch的定时任务；stop方法则是cancel掉这个定时任务；catalogServicesWatch方法使用consul.getCatalogServices方法获取consulIndex然后更新本地的catalogServicesIndex，发布HeartbeatEvent
到此，相信大家对“spring cloud的ConsulCatalogWatch有什么作用”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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