nacos ServiceManager的removeInstance有什么作用

这篇文章主要介绍"nacos ServiceManager的removeInstance有什么作用"，在日常操作中，相信很多人在nacos ServiceManager的removeInstance有什么作用问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"nacos ServiceManager的removeInstance有什么作用"的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

序

本文主要研究一下nacos ServiceManager的removeInstance

ServiceManager

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

@Component@DependsOn("nacosApplicationContext")public class ServiceManager implements RecordListener {    /**     * Map>     */    private Map> serviceMap = new ConcurrentHashMap<>();    private LinkedBlockingDeque 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 removeInstance(String namespaceId, String serviceName, boolean ephemeral, Instance... ips) throws NacosException {        Service service = getService(namespaceId, serviceName);        removeInstance(namespaceId, serviceName, ephemeral, service, ips);    }    public void removeInstance(String namespaceId, String serviceName, boolean ephemeral, Service service, Instance... ips) throws NacosException {        String key = KeyBuilder.buildInstanceListKey(namespaceId, serviceName, ephemeral);        List instanceList = substractIpAddresses(service, ephemeral, ips);        Instances instances = new Instances();        instances.setInstanceList(instanceList);        consistencyService.put(key, instances);    }    public List substractIpAddresses(Service service, boolean ephemeral, Instance... ips) throws NacosException {        return updateIpAddresses(service, UtilsAndCommons.UPDATE_INSTANCE_ACTION_REMOVE, ephemeral, ips);    }    public List updateIpAddresses(Service service, String action, boolean ephemeral, Instance... ips) throws NacosException {        Datum datum = consistencyService.get(KeyBuilder.buildInstanceListKey(service.getNamespaceId(), service.getName(), ephemeral));        Map oldInstanceMap = new HashMap<>(16);        List currentIPs = service.allIPs(ephemeral);        Map map = new ConcurrentHashMap<>(currentIPs.size());        for (Instance instance : currentIPs) {            map.put(instance.toIPAddr(), instance);        }        if (datum != null) {            oldInstanceMap = setValid(((Instances) datum.value).getInstanceList(), map);        }        // use HashMap for deep copy:        HashMap instanceMap = new HashMap<>(oldInstanceMap.size());        instanceMap.putAll(oldInstanceMap);        for (Instance instance : ips) {            if (!service.getClusterMap().containsKey(instance.getClusterName())) {                Cluster cluster = new Cluster(instance.getClusterName(), service);                cluster.init();                service.getClusterMap().put(instance.getClusterName(), cluster);                Loggers.SRV_LOG.warn("cluster: {} not found, ip: {}, will create new cluster with default configuration.",                    instance.getClusterName(), instance.toJSON());            }            if (UtilsAndCommons.UPDATE_INSTANCE_ACTION_REMOVE.equals(action)) {                instanceMap.remove(instance.getDatumKey());            } else {                instanceMap.put(instance.getDatumKey(), instance);            }        }        if (instanceMap.size() <= 0 && UtilsAndCommons.UPDATE_INSTANCE_ACTION_ADD.equals(action)) {            throw new IllegalArgumentException("ip list can not be empty, service: " + service.getName() + ", ip list: "                + JSON.toJSONString(instanceMap.values()));        }        return new ArrayList<>(instanceMap.values());    }    //......}

• removeInstance方法通过substractIpAddresses获取移除执行instances之后的instanceList，然后通过consistencyService.put方法进行更新；substractIpAddresses方法执行updateIpAddresses方法，其action参数值为UtilsAndCommons.UPDATE_INSTANCE_ACTION_REMOVE，它先使用service.allIPs(ephemeral)获取instance列表，针对remove动作会根据instance.getDatumKey()将其从instanceMap中移除

Service.allIPs

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

public class Service extends com.alibaba.nacos.api.naming.pojo.Service implements Record, RecordListener {    private static final String SERVICE_NAME_SYNTAX = "[0-9a-zA-Z@\\.:_-]+";    @JSONField(serialize = false)    private ClientBeatCheckTask clientBeatCheckTask = new ClientBeatCheckTask(this);    private String token;    private List owners = new ArrayList<>();    private Boolean resetWeight = false;    private Boolean enabled = true;    private Selector selector = new NoneSelector();    private String namespaceId;    /**     * IP will be deleted if it has not send beat for some time, default timeout is 30 seconds.     */    private long ipDeleteTimeout = 30 * 1000;    private volatile long lastModifiedMillis = 0L;    private volatile String checksum;    /**     * TODO set customized push expire time:     */    private long pushCacheMillis = 0L;    private Map clusterMap = new HashMap<>();    //......    public List allIPs(boolean ephemeral) {        List allIPs = new ArrayList<>();        for (Map.Entry entry : clusterMap.entrySet()) {            allIPs.addAll(entry.getValue().allIPs(ephemeral));        }        return allIPs;    }    //......}

• Service的allIPs方法会遍历clusterMap，然后通过Cluster.allIPs(ephemeral)收集Instance

Cluster.allIPs

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

public class Cluster extends com.alibaba.nacos.api.naming.pojo.Cluster implements Cloneable {    private static final String CLUSTER_NAME_SYNTAX = "[0-9a-zA-Z-]+";    /**     * a addition for same site routing, can group multiple sites into a region, like Hangzhou, Shanghai, etc.     */    private String sitegroup = StringUtils.EMPTY;    private int defCkport = 80;    private int defIPPort = -1;    @JSONField(serialize = false)    private HealthCheckTask checkTask;    @JSONField(serialize = false)    private Set persistentInstances = new HashSet<>();    @JSONField(serialize = false)    private Set ephemeralInstances = new HashSet<>();    @JSONField(serialize = false)    private Service service;    @JSONField(serialize = false)    private volatile boolean inited = false;    private Map metadata = new ConcurrentHashMap<>();    //......    public List allIPs(boolean ephemeral) {        return ephemeral ? new ArrayList<>(ephemeralInstances) : new ArrayList<>(persistentInstances);    }    //......}

• Cluster的allIPs方法根据ephemeral来返回ephemeralInstances或者persistentInstances

小结

ServiceManager的removeInstance方法通过substractIpAddresses获取移除执行instances之后的instanceList，然后通过consistencyService.put方法进行更新；substractIpAddresses方法执行updateIpAddresses方法，其action参数值为UtilsAndCommons.UPDATE_INSTANCE_ACTION_REMOVE，它先使用service.allIPs(ephemeral)获取instance列表，针对remove动作会根据instance.getDatumKey()将其从instanceMap中移除

到此，关于"nacos ServiceManager的removeInstance有什么作用"的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注网站，小编会继续努力为大家带来更多实用的文章！