clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/NodeLookup.java


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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.core;

import com.yahoo.vespa.clustercontroller.core.listeners.NodeAddedOrRemovedListener;

/**
 * Interface for a node lookup service, such as slobrok, config, or tier controller.
 */
public interface NodeLookup {

    void shutdown();

    boolean updateCluster(ContentCluster cluster, NodeAddedOrRemovedListener listener);

    /**
     * Returns whether the lookup instance has been able to bootstrap itself with information about nodes.
     *
     * Calling updateCluster() _before_ isReady has returned true may not provide any useful data.
     */
    boolean isReady();

}