Talk nacos of DelegateConsistencyServiceImpl

sequence

In this paper, we look nacos of DelegateConsistencyServiceImpl

ConsistencyService

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/consistency/ConsistencyService.java

public interface ConsistencyService {

    /**
     * Put a data related to a key to Nacos cluster
     *
     * @param key   key of data, this key should be globally unique
     * @param value value of data
     * @throws NacosException
     * @see
     */
    void put(String key, Record value) throws NacosException;

    /**
     * Remove a data from Nacos cluster
     *
     * @param key key of data
     * @throws NacosException
     */
    void remove(String key) throws NacosException;

    /**
     * Get a data from Nacos cluster
     *
     * @param key key of data
     * @return data related to the key
     * @throws NacosException
     */
    Datum get(String key) throws NacosException;

    /**
     * Listen for changes of a data
     *
     * @param key      key of data
     * @param listener callback of data change
     * @throws NacosException
     */
    void listen(String key, RecordListener listener) throws NacosException;

    /**
     * Cancel listening of a data
     *
     * @param key      key of data
     * @param listener callback of data change
     * @throws NacosException
     */
    void unlisten(String key, RecordListener listener) throws NacosException;

    /**
     * Tell the status of this consistency service
     *
     * @return true if available
     */
    boolean isAvailable();
}
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• ConsistencyService定义了put、remove、get、listen、unlisten、isAvailable方法

DelegateConsistencyServiceImpl

nacos-1.1.3/naming/src/main/java/com/alibaba/nacos/naming/consistency/DelegateConsistencyServiceImpl.java

@Service("consistencyDelegate")
public class DelegateConsistencyServiceImpl implements ConsistencyService {

    @Autowired
    private PersistentConsistencyService persistentConsistencyService;

    @Autowired
    private EphemeralConsistencyService ephemeralConsistencyService;

    @Override
    public void put(String key, Record value) throws NacosException {
        mapConsistencyService(key).put(key, value);
    }

    @Override
    public void remove(String key) throws NacosException {
        mapConsistencyService(key).remove(key);
    }

    @Override
    public Datum get(String key) throws NacosException {
        return mapConsistencyService(key).get(key);
    }

    @Override
    public void listen(String key, RecordListener listener) throws NacosException {

        // this special key is listened by both:
        if (KeyBuilder.SERVICE_META_KEY_PREFIX.equals(key)) {
            persistentConsistencyService.listen(key, listener);
            ephemeralConsistencyService.listen(key, listener);
            return;
        }

        mapConsistencyService(key).listen(key, listener);
    }

    @Override
    public void unlisten(String key, RecordListener listener) throws NacosException {
        mapConsistencyService(key).unlisten(key, listener);
    }

    @Override
    public boolean isAvailable() {
        return ephemeralConsistencyService.isAvailable() && persistentConsistencyService.isAvailable();
    }

    private ConsistencyService mapConsistencyService(String key) {
        return KeyBuilder.matchEphemeralKey(key) ? ephemeralConsistencyService : persistentConsistencyService;
    }
}
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• DelegateConsistencyServiceImpl ConsistencyService implements the interface; which put, remove, get, listen, internal methods are used unlisten mapConsistencyService is used to determine further persistentConsistencyService ephemeralConsistencyService; isAvailable method of claim ephemeralConsistencyService which are available and persistentConsistencyService

summary

ConsistencyService defined put, remove, get, listen, unlisten, isAvailable method; DelegateConsistencyServiceImpl achieved ConsistencyService interfaces; the put, remove, get, listen, internal UNLISTEN methods use mapConsistencyService is determined using ephemeralConsistencyService further persistentConsistencyService; which isAvailable method of claim ephemeralConsistencyService and persistentConsistencyService are available

doc

• DelegateConsistencyServiceImpl