Talk nacos ServiceManager of UpdatedServiceProcessor

sequence

In this paper the look UpdatedServiceProcessor nacos ServiceManager

ServiceManager.init

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/core/ServiceManager.java

@Component
@DependsOn("nacosApplicationContext")
public class ServiceManager implements RecordListener<Service> {

    /**
     * Map<namespace, Map<group::serviceName, Service>>
     */
    private Map<String, Map<String, Service>> serviceMap = new ConcurrentHashMap<>();

    private LinkedBlockingDeque<ServiceKey> toBeUpdatedServicesQueue = new LinkedBlockingDeque<>(1024 * 1024);

    private Synchronizer synchronizer = new ServiceStatusSynchronizer();

    private final Lock lock = new ReentrantLock();

    @Resource(name = "consistencyDelegate")
    private ConsistencyService consistencyService;

    @Autowired
    private SwitchDomain switchDomain;

    @Autowired
    private DistroMapper distroMapper;

    @Autowired
    private ServerListManager serverListManager;

    @Autowired
    private PushService pushService;

    private final Object putServiceLock = new Object();

    @PostConstruct
    public void init() {

        UtilsAndCommons.SERVICE_SYNCHRONIZATION_EXECUTOR.schedule(new ServiceReporter(), 60000, TimeUnit.MILLISECONDS);

        UtilsAndCommons.SERVICE_UPDATE_EXECUTOR.submit(new UpdatedServiceProcessor());

        try {
            Loggers.SRV_LOG.info("listen for service meta change");
            consistencyService.listen(KeyBuilder.SERVICE_META_KEY_PREFIX, this);
        } catch (NacosException e) {
            Loggers.SRV_LOG.error("listen for service meta change failed!");
        }
    }

    //......
}
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• ServiceManager init method to UtilsAndCommons.SERVICE_UPDATE_EXECUTOR submitted UpdatedServiceProcessor task

UpdatedServiceProcessor

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/core/ServiceManager.java

    private class UpdatedServiceProcessor implements Runnable {
        //get changed service from other server asynchronously
        @Override
        public void run() {
            ServiceKey serviceKey = null;

            try {
                while (true) {
                    try {
                        serviceKey = toBeUpdatedServicesQueue.take();
                    } catch (Exception e) {
                        Loggers.EVT_LOG.error("[UPDATE-DOMAIN] Exception while taking item from LinkedBlockingDeque.");
                    }

                    if (serviceKey == null) {
                        continue;
                    }
                    GlobalExecutor.submitServiceUpdate(new ServiceUpdater(serviceKey));
                }
            } catch (Exception e) {
                Loggers.EVT_LOG.error("[UPDATE-DOMAIN] Exception while update service: {}", serviceKey, e);
            }
        }
    }
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• UpdatedServiceProcessor method implements Runnable whose run method will continue to cycle to obtain elements from toBeUpdatedServicesQueue, then use GlobalExecutor.submitServiceUpdate submit ServiceUpdater

ServiceUpdater

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/core/ServiceManager.java

    private class ServiceUpdater implements Runnable {

        String namespaceId;
        String serviceName;
        String serverIP;

        public ServiceUpdater(ServiceKey serviceKey) {
            this.namespaceId = serviceKey.getNamespaceId();
            this.serviceName = serviceKey.getServiceName();
            this.serverIP = serviceKey.getServerIP();
        }

        @Override
        public void run() {
            try {
                updatedHealthStatus(namespaceId, serviceName, serverIP);
            } catch (Exception e) {
                Loggers.SRV_LOG.warn("[DOMAIN-UPDATER] Exception while update service: {} from {}, error: {}",
                    serviceName, serverIP, e);
            }
        }
    }
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• ServiceUpdater implement the Runnable interface, its run method of execution is updatedHealthStatus

ServiceManager.updatedHealthStatus

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/core/ServiceManager.java

@Component
@DependsOn("nacosApplicationContext")
public class ServiceManager implements RecordListener<Service> {

    /**
     * Map<namespace, Map<group::serviceName, Service>>
     */
    private Map<String, Map<String, Service>> serviceMap = new ConcurrentHashMap<>();

    private LinkedBlockingDeque<ServiceKey> toBeUpdatedServicesQueue = new LinkedBlockingDeque<>(1024 * 1024);

    private Synchronizer synchronizer = new ServiceStatusSynchronizer();

    private final Lock lock = new ReentrantLock();

    @Resource(name = "consistencyDelegate")
    private ConsistencyService consistencyService;

    @Autowired
    private SwitchDomain switchDomain;

    @Autowired
    private DistroMapper distroMapper;

    @Autowired
    private ServerListManager serverListManager;

    @Autowired
    private PushService pushService;

    private final Object putServiceLock = new Object();

    //......

    public void updatedHealthStatus(String namespaceId, String serviceName, String serverIP) {
        Message msg = synchronizer.get(serverIP, UtilsAndCommons.assembleFullServiceName(namespaceId, serviceName));
        JSONObject serviceJson = JSON.parseObject(msg.getData());

        JSONArray ipList = serviceJson.getJSONArray("ips");
        Map<String, String> ipsMap = new HashMap<>(ipList.size());
        for (int i = 0; i < ipList.size(); i++) {

            String ip = ipList.getString(i);
            String[] strings = ip.split("_");
            ipsMap.put(strings[0], strings[1]);
        }

        Service service = getService(namespaceId, serviceName);

        if (service == null) {
            return;
        }

        boolean changed = false;

        List<Instance> instances = service.allIPs();
        for (Instance instance : instances) {

            boolean valid = Boolean.parseBoolean(ipsMap.get(instance.toIPAddr()));
            if (valid != instance.isHealthy()) {
                changed = true;
                instance.setHealthy(valid);
                Loggers.EVT_LOG.info("{} {SYNC} IP-{} : {}@{}{}",
                    serviceName, (instance.isHealthy() ? "ENABLED" : "DISABLED"),
                    instance.getIp(), instance.getPort(), instance.getClusterName());
            }
        }

        if (changed) {
            pushService.serviceChanged(service);
        }

        StringBuilder stringBuilder = new StringBuilder();
        List<Instance> allIps = service.allIPs();
        for (Instance instance : allIps) {
            stringBuilder.append(instance.toIPAddr()).append("_").append(instance.isHealthy()).append(",");
        }

        if (changed && Loggers.EVT_LOG.isDebugEnabled()) {
            Loggers.EVT_LOG.debug("[HEALTH-STATUS-UPDATED] namespace: {}, service: {}, ips: {}",
                service.getNamespaceId(), service.getName(), stringBuilder.toString());
        }

    }

    //......
}
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• The method obtains from updatedHealthStatus synchronizer msg, assembly ipsMap, after acquiring information instances service.allIPs (), then traverse instances valid state acquired from the instance ipsMap, if the instance of isHealthy () is not on the mark changed, updated instance the healthy; for the release event by pushService.serviceChanged (service) changed, and finally print the log

summary

• ServiceManager init method to UtilsAndCommons.SERVICE_UPDATE_EXECUTOR submitted UpdatedServiceProcessor task
• UpdatedServiceProcessor method implements Runnable whose run method will continue to cycle to obtain elements from toBeUpdatedServicesQueue, then use GlobalExecutor.submitServiceUpdate submit ServiceUpdater
• ServiceUpdater implement the Runnable interface, its run method of execution is updatedHealthStatus

doc

• ServiceManager