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- <head>
- <title>Deployment And Configuration Engine (DAnCE) Release Notes</title>
- </head>
-
- <body>
- <h1>Deployment And Configuration Engine (DAnCE) Release Notes</h1>
-
- <p><b>D</b>eployment <b>An</b>d <b>C</b>onfiguration <b>E</b>ngine
- <b>(DAnCE)</b> is an implementation of the run-time infrastructure as
- defined by the final adopted <a
- href="http://www.omg.org/cgi-bin/doc?ptc/2003-07-08">OMG Deployment &amp;
- Configuration (D&amp;C) specification (ptc/2003-07-08)</a>, which deals with the
- configuration and deployment of component-based applications. Currently
- DAnCE only supports the deployment &amp; configuration of CORBA
- Component Model (CCM)-based applications, though we are interested in
- generalizing it for other component models in future work. DAnCE uses
- XML descriptors to drive the deployment it performs. One way to
- generate these descriptors is using the <b>Co</b>mponent
- <b>S</b>ynthesis using <b>M</b>odel-<b>I</b>ntegrated <b>C</b>omputing
- (<a href="http://www.dre.vanderbilt.edu/cosmic">CoSMIC</a>) tool-suite.
- DAnCE currently uses <b>C</b>omponent <b>I</b>ntegrated <b>A</b>CE
- <b>O</b>RB (<a href="http://www.dre.vanderbilt.edu/CIAO">CIAO</a>) as
- the underlying CCM implementation in the current release, though again
- we are interested in generalizing it for other CCM implementations in
- future work.
- </p>
-
- <h3>D&amp;C XML Schema Handling</h3>
-
- <p> The XML handlers shipped with DAnCE are capable of handling almost
- all elements that are defined in the D&amp;C schema. In this context,
- handling refers to reading the XML tags and converting them to the
- equivalent in-memory IDL-based data structures defined by the
- specifications. DAnCE supports the following types of descriptors
- specified in the D&amp;C specification:</p>
- <ul>
- <li>
- <p>
- <b>CORBA Component Descriptor(.ccd)</b> &ndash;
- Contains information about component interfaces including
- component ports.
- </p>
- </li>
- <li>
- <p>
- <b>Component Implementation Descriptor(.cid)</b>
- &ndash; Contains information about component implementations
- which might be either monolithic or assembly based. In the case
- of assembly based implementations, this descriptor also captures
- the dependencies and the connections among components
- </p>
- </li>
- <li>
- <p>
- <b>Implementation Artifact Descriptor(.iad)</b>
- &ndash; Contains information about implementation artifacts
- in-cluding dependencies between such artifacts
- </p>
- </li>
- <li>
- <p>
- <b>Component Package Descriptor(.cpd)</b> &ndash;
- Contains information about grouping of multiple imple-mentations
- of the same component interface into component packages
- </p>
- </li>
- <li>
- <p>
- <b>Package Configuration Descriptor(.pcd)</b>
- &ndash; Contains information about specific configurations of
- such component packages
- </p>
- </li>
- <li>
- <p>
- <b>Component Domain Descriptor(.cdd)</b> &ndash;
- Contains information about the target environment in which the
- component-based application will be deployed
- </p>
- </li>
- <li>
- <p>
- <b>TopLevel Package Descriptor(.tpd)</b> &ndash; Contains
- information identifying the top-level element in a component
- package descriptor which might include information about multiple
- elements
- </p>
- </li>
-
- <li>
- <p>
- <b>Component Deployment Plan(.cdp)</b> &ndash; Contains
- information that actually drives the deployment including
- information about individual components that represent the
- leaf-nodes in case of a hierarchical assembly, connections
- between components, and assignment of components to nodes etc.
- </p>
- </li>
- </ul>
- <p> For all the above elements, DAnCE supports proxying of the elements
- as defined by XMI, i.e, DAnCE supports both parsing of the elements
- inline and reference through <b><code>href</code></b> attribute. Some
- D&amp;C schema elements are however not handled, including:</p>
- <ul>
- <li>
- <p>
- <b>Deployment:Any</b> &ndash; This is a complex
- element that is composed of many sub-elements. Currently, DAnCE
- only parses a subset of the sub-elements of
- <b><code>Deployment:Any</code></b>. Specifically, DAnCE supports all the
- basic data types defined as part of <b><code>Deployment:Any</code></b>,
- and doesn't understand any complex types.
- </p>
- </li>
- <li>
- <p>
- <b>xmi:Extension</b> &ndash; This element allows the
- augmention of the standard D&amp;C schema with user-defined
- elements. Currently DAnCE doesn't support user-defined extensions
- to the schema.
- </p>
- </li>
- <li>
- <p>
- <b>Deployment:Requirement</b> &ndash; This element is
- allows the description of requirements of component-based
- applications. Since handling this description requires interaction
- with the <b><code>TargetManager</code></b> interface (which is not yet
- supported), support for <b><code>Deployment:Requirement</code></b> is not
- present.
- </p>
- </li>
- <li>
- <p>
- <b>Deployment:ComponentPropertyDescriptioncode></b> &ndash;
- This element is used to specify default values for attributes of
- component. DAnCE doesn't support setting the values for attributes
- of components using this tag.
- </p>
- </li>
- <li>
- <p>
- <b>Deployment:ComponentExternalPortEndpoint,
- Deployment:ExternalReferenceEndpoint</b> &ndash; These
- elements are used to specify connections between ports of
- components in one assembly with ports of components in a different
- assembly, or connections between component ports and external
- connection endpoints. These features are needed to support
- assemblies of components. DAnCE doesn't support yet hierarchical
- assemblies, i.e., creation of assemblies which can themselves
- contain sub-assemblies.
- </p>
- </li>
- <li>
- <p>
- <b>Deployment:PlanPropertyMapping</b> &ndash; This
- element is used to delegate property mapping between a component's
- external properties to properties of subcomponents that actually
- implement the behavior of the larger component. Since DAnCE doesn't
- support hierarchical assemblies, this tag is not yet supported.
- </p>
- </li>
- </ul>
- <p> We plan to support these features in future versions of DAnCE.
- </p>
- <hr />
- <h3> D&amp;C Management Interfaces</h3>
-
- <p> The D&amp;C specification defines a set of standard CORBA
- interfaces that are used to perform the deployment of component-based
- applications. These interfaces depend on the in-memory IDL data
- structures that are built by DAnCE's XML handlers. Below we outline the
- list of interfaces defined by the specification and the level of
- support for each interface in DAnCE:</p>
- <ul>
- <li>
- <p>
- <b>RepositoryManager</b> &ndash; Only the
- <b><code>installPackage()</code></b> and <b><code>findPackageByName()</code></b>
- operations of this interface are implemented.
- </p>
- </li>
- <li>
- <p>
- <b>TargetManager</b> &ndash; This interface has not
- been implemented at all. Implementation of this interface is
- planned for the future.
- </p>
- </li>
- <li>
- <p>
- <b>ExecutionManager</b> &ndash; All operations defined
- in this interface are implemented.
- </p>
- </li>
- <li>
- <p>
- <b>DomainApplicationManager, DomainApplication</b>
- &ndash; All operations except <b><code>getApplications()</code></b>
- operation of DomainApplicationManager are implemented.
- </p>
- </li>
- <li>
- <p>
- <b>NodeManager </b>&ndash; All operations except <strong><code>joinDomain()</code></strong> and <strong><code>leaveDomain()</code></strong> operations of NodeManager are implemented. </p>
- </li>
- <li>
- <p><b> NodeApplicationManager, NodeApplication</b> &ndash; All operations defined in these interfaces are
- implemented. </p>
- </li>
- </ul>
- <p>
- We plan to finish implementing the unsupported features in future versions of DAnCE.
- </p>
- <p>
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