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eureka-server developed by Netflix

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package com.netflix.eureka2.server.service;

import com.netflix.eureka2.registry.InstanceInfo;
import com.netflix.eureka2.server.registry.Source;
import com.netflix.eureka2.service.ServiceChannel;
import rx.Observable;

/**
 * A {@link com.netflix.eureka2.service.ServiceChannel} implementation representing a replication stream
 * between two Eureka write servers.
 *
 * The client side of the channel is a source of data, that comes from its own registry, and is limited
 * to entries with {@link Source.Origin#LOCAL}.
 *
 * On the server side the data are put into the registry with origin set to {@link Source.Origin#REPLICATED}.
 * A replicated entry is removed from the registry under following circumstances:
 * 
 *     Explicit {@link #unregister(String)} call - an entry was removed from the source registry
 *     Replication connection termination - invalidates all entries replicated over this connection
 *     No heartbeat within configured period of time - equivalent to connection termination
 * 
 *
 * @author Nitesh Kant
 */
public interface ReplicationChannel extends ServiceChannel {

    /**
     * Registers the passed instance with eureka.
     *
     * @param instanceInfo The instance definition.
     *
     * @return Acknowledgment for the registration.
     */
    Observable register(InstanceInfo instanceInfo);

    /**
     * Updates the {@link InstanceInfo} registered with this channel.
     *
     * @param newInfo The updated info.
     *
     * @return Acknowledgment for this update.
     */
    Observable update(InstanceInfo newInfo);

    /**
     * Unregisters the {@link InstanceInfo} with given id.
     *
     * @return Acknowledgment for unregistration.
     */
    Observable unregister(String instanceId);
}