public interface Admin extends DatasetManager, SecureStoreManager, MessagingAdmin, ArtifactManager {

} 

/**
 * Provides access to information about artifacts
 */
interface ArtifactManager {

/**
 * get the artifacts which extends the plugins identified by pluginType and pluginName
 */
Set<ArtifactInfo> getParentArtifactsForPlugins(String pluginType, String pluginName);

/**
 * get the plugin artifacts identified by pluginType and pluginName, this can return more than one artifacts when there are multiple versions
 */
Set<ArtifactInfo> getPluginArtifacts(String pluginType, String pluginName);

/**
 * Get the ArtifactInfo for artifact given the name and version
 */
ArtifactInfo getArtifactInfo(String artifactName, String artifactVersion);
...
} 

interface PluginContext {
...
/**
 * given the parent classloader and plugin artifact info, create and return a plugin classloader, with this plugin classloader, 
 * user can load the plugin classes and instantiate the plugin.
 * /
ClassLoader createPluginClassLoader(ClassLoader parentClassLoader, ArtifactInfo pluginArtifact);
} 

public interface PluginContext {
...
 
 /**
   * Gets Readonly Artifact Repository, ReadOnlyArtifactRepository provides ability to get artifacts by plugin type and name. Get plugin class   
   * for a given artifactId, pluginType and PluginName and also instantiate this plugin.
   * You can only perform read only operation on artifacts and instantiate plugins using the artifact. However any delete or modify operation  
   * is now allowed.
   * Since this provides live view of Artifact Repository, same call could provide different results, if there is any change in repository.
   *
   *
   * 
   * @return A read only access to artifact repository
   *
   */
   ReadOnlyArtifactRepository getArtifactRepository(); 
  
  ...
}

/**
 * Read only access to artifact repository.
 */
class ReadOnlyArtifactRepository {

/** 
 * for the plugin type and plugin name, get all the artifact parents that are usableBy the plugin.
 * @param pluginType
 * @param pluginName
 * @return set of parent artifacts which extends the plugin identified by pluginType and pluginName.
 */
public  Set<ArtifactId>  getParentArtifactsForPlugin(String pluginType, String pluginName)


/**
 * Get the Plugin identified by parent artifact Id, pluginType and pluginName
 * @param parentArtifactId
 * @param pluginType
 * @param pluginName
 * @return Plugin
 * throws PluginNotExistsException if the plugin is not found
 */
public Plugin getPlugin(ArtifactId parentArtifactId, String pluginType, String pluginName)



/**
 * Instantiate the supplied plugin using the provided ClassLoader and return the instantiated plugin.
 * @param classLoader
 * @param loaded plugin 
 * @return instantiated plugin
 * throws InstantiationException if the plugin cannot be instantiated.
 */
 public <T> T instantiatePlugin(ClassLoader classLoader, Plugin plugin)

}