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 public class AdminClient {
    
	/**
     * A producer is instantiated by providing a set of key-value pairs as configuration. Most
	 * of the settings will be related to NetworkClient
     *
     * @param properties settings related to Network client and at least one broker from KafkaCluster to connect to
     */
    public AdminClient(Properties properties) 
    
	/**
     * Create topic with given number of partitions and replication factor, replica assignment will be handled by Kafka cluster
     *
     * @throws ApiException
     */
    public void createTopic(String topicName, int partitions, int replicationFactor, List<ConfigEntry> configs) throws ApiException;
    
	/**
     * Create topic with specified replica assignment (number of partitions and replication factor will be taken
     * from replica assignment string)
     *
     * @throws ApiException
     */
    public void createTopic(String topicName, String replicaAssignment, List<ConfigEntry> configs) throws ApiException;

    /**
     * Alter existing topic partitions and/or replica assignment among Kafka brokers
     *
     * @throws ApiException
     */
    public abstract void alterTopic(String topicName, Integer partitions, String replicaAssignment,
                                    List<ConfigEntry> addedConfigs, List<String> deletedConfigs) throws ApiException;
    /**
     * Delete Kafka topic by name
     *
     * @throws ApiException
     */
    public abstract void deleteTopic(String topicName) throws ApiException;
    
	/**
     * List all existing topics in Kafka cluster
     *
     * @throws ApiException
     */
    public abstract List<String> listTopics() throws ApiException;
    
	/**
     * Request replication information about Kafka topic
     *
     * @throws ApiException
     */
    public abstract DescribeTopicOutput describeTopic(String topicName) throws ApiException;
    
	/**
     * Initiate long-running reassign partitions procedure
     *
     * @param partitionsReassignment manual partitions assignment string (according to ReassignPartitionsCommand)
     * @return future of the reassignment result which is completed once server-side partitions reassignment has succeeded or
     * an error occurred so that partitions reassignment cannot be started
     * @throws ApiException
     */
    public abstract Future<ReassignPartitionsResponse> reassignPartitions(String partitionsReassignment) throws ApiException;

    /**
     * Check the interim status of the partitions reassignment
     *
     * @param partitionsReassignment manual partitions assignment string (according to ReassignPartitionsCommand)
     * @return partition to reassignment result code (completed, in-progress, failed)
     * @throws ApiException
     */
    public abstract Map<TopicPartition, Short> verifyReassignPartitions(String partitionsReassignment) throws ApiException;
    
	/**
     * Initiate long-running preferred replica leader election procedure
     *
     * @param partitions serialized partitions for which preferred replica leader election will be started
     *                   (according to PreferredReplicaLeaderElectionCommand)
     * @return future of the election result which is completed once server-side preferred replica is elected for provided partitions or
     * an error has occurred
     * @throws ApiException
     */
    public abstract Future<PreferredReplicaLeaderElectionResponse> preferredReplicaLeaderElection(String partitions) throws ApiException;

    /**
     * Check the interim status of the preferred replica leader election
     *
     * @param partitions for which preferred replica leader election was started (according to PreferredReplicaLeaderElectionCommand)
     * @return partition to reassignment result code (completed, in-progress, failed)
     * @throws ApiException
     */
    public abstract VerifyPreferredReplicaLeaderElectionResponse verifyPreferredReplicaLeaderElection(String partitions)
            throws ApiException;
	/**
     * A generic facility to send Admin request and return response counterpart
     *
     * @param adminRequest AdminRequest message
     * @param <T>          concrete AdminRequest type
     * @return response counterpart
     * @throws ApiException
     */
    private <T extends AbstractAdminResponse> T sendAdminRequest(AbstractAdminRequest<T> adminRequest) throws ApiException;

 
	/**
     * Refreshes cluster metadata cache - list of brokers and controller
     * 
     * @throws ApiException
     */
    private void updateClusterMetadata() throws Exception;

}