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public interface ConfigurationServer {
    public static final String Name = "configuration-server";

    /**
     * Persists default values for the configuration table, pods/zones, and VLANs
     *
     * @return
     */
    public void persistDefaultValues() throws InternalErrorException;
    public void updateKeyPairs();

    /**
     * get the value of configuration parameter at the scope given for the corresponding resource level (account, zone, cluster, or primary storage)
     * If either scope or resourceId is not specified then get the global value
     * @param name
     *             configuration parameter name
     * @param scope
     *             Scope at which parameter value is defined (account, zone, cluster, or primary storage)
     * @param resourceId
     *             id of the resource (account, zone, cluster, or primary storage)
     * @return value of the configuration parameter 
     */
    public String getConfigValue(String name, String scope, Long resourceId);

    /**
     * get the list of configuration parameters and values at the scope given for the corresponding resource level (account, zone, cluster, or primary storage)
     * If either scope or resourceId is not specified then get the global value
     * @param scope
     *             Scope at which parameter value is defined (account, zone, cluster, or primary storage)
     * @param resourceId
     *             id of the resource (account, zone, cluster, or primary storage)
     * @return list of the configuration parameters and values 
     */
    public List<ConfigurationVO> getConfigListByScope(String scope, Long resourceId);
}