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public interface RuntimeContext {
    /**
	 * Get the specific external resource information by the resourceName.
	 */
	<T extends ExternalResourceInfo> Set<T> Set<ExternalResourceInfo> getExternalResourceInfos(String resourceName, Class<T> externalResourceType);
}

public interface ExternalResourceDriverFactory {
    /**
    * Construct the ExternalResourceDriver from configuration.
    */
    ExternalResourceDriver createExternalResourceDriver(Congiuration config);
}

public interface ExternalResourceDriver {
    /**
    * Retrieve the information of the external resources according to the amount.
    */
    Set<? extends ExternalResourceInfo> retrieveResourceInfo(long amount);
}

public interface ExternalResourceInfo {
    String getProperty(String key);
    Collection<String> getKeys();
}