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public class ShareGroupDescription {
    private final String groupId;
    private final Collection<MemberDescription> members;
    private final ShareGroupState state;
    private final Node coordinator;
    private final Set<AclOperation> authorizedOperations;
	private final int groupEpoch;
    private final int targetAssignmentEpoch;

 	// ...

	/**
	 * The epoch of the share group.
	 */
	public int groupEpoch() {
		return groupEpoch;
	}

	/**
	 * The epoch of the target assignment.
	 */
	public int targetAssignmentEpoch() {
		return targetAssignmentEpoch;
	}
}