Paul S. Wang. Kent State University
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1 The Evolving MCP Design Paul S. Wang Institute for Computational Mathematics Kent State University mcp-design-1 Contents æ Background IAMC æ MCP server-side and client-side requirements æ MCP protocol design æ MCP headers æ MCP sample messages æ MCP Java implementation API mcp-design-2
2 MCP Issues and Considerations æ Supporting IAMC: mathematical data encodings, computation controls æ Simple, powerful, and æexible æ Meeting client-to-server and server-to-client requirements æ Using diæerent types of data-transfer encodings æ Employing stream connection between client and server æ Assuming peer-to-peer interactions æ Charging, authentication, security usual æ Object-oriented designimplementation java? mcp-design-3 Client Requirements æ Sending computation commands æ Receiving computational results, in various forms of encoding æ Store results in æles and resend stored results to other servers later æ Sending control commands to server æ Receiving control responses e.g. server status information æ Sending client status æ Receiving commands from server æ Responding to commands from server æ Issuing commands both synchronously waiting for result before next command and asynchronously may issue next command without waiting for result of previous command mcp-design-4
3 æ Receiving results out of order A result identiæes its command æ Interrupting an on-going computation may be several on-going æ Disconnecting immediately or after all results are in mcp-design-5 Server Requirements æ Receiving computation requests, in literal ascii string or standard encoded forms æ Sending computed results, in various encoded forms MathML, MP, OpenMath, gif, pdf,... æ Handling both sync and async requests æ Sending control requests to client æ Receiving control responses e.g. client status information æ Sending server status æ Sending results back as they are produced æ Responding to control requests from client æ Disconnecting mcp-design-6
4 MCP Protocol MCP message format: æ First line: Command MCP version Control MCP version Result MCP version æ Header and body format HTTP style æ Header Key-value pairs HTTP style æ Consider features of HTTP-NG with session layer mcp-design-7 Some Available Hearders This will have to be consdered carefully and will evolve æ Status: normal, error no, ready, busy, terminating æ ControlRequest: string æ ControlResponse: string æ Accept: types of result æ CanDo: computing capabilities æ EngineID: compute engine identiæcation æ ClientID: IAMC client identiæcation æ Mode: sync or aync æ Sequence: linear sequence number to match results with commands mcp-design-8
5 æ Content-Type: body type e.g. applicationx-math-mp, or textmathml default textplain æ Content-length: bytes æ Transfer-Encoding: if any, default none useful for transfer mcp-design-9 Example Client Computation Request Command MCP 1.0 Mode: sync or async, default sync Sequence: 1 Content-Type: applicationx-math-mp or -infix, or -openmath éécontent-type: applicationx-math-asciiéé Content-length: 356 Body mcp-design-10
6 Example Server Computation Response Result MCP 1.0 Status: normal Sequence: 1 Content-Type: applicationx-math-mp Content-length: 4000 Body mcp-design-11 Example Client Control Request Control MCP 1.0 ControlRequest: connect Accept: mp,mathml ClientID: XXXX mcp-design-12
7 Example Server Control Response Control MCP 1.0 ControlResponse: connect-confirmation CandDo: factoring,differentiation,integration,plotting EngineID: Maxima mcp-design-13 Server to Client Control Requests æ Prompts for input from the user æ Choices for userclient selection æ Dialogue for userclient input æ Setting Cookie æ Disconnecting mcp-design-14
8 MCP Layer Interfaces Client API MCP Layer Server API MCP Layer MCP Protocol mcp-design-15 Java Classes æ These will emerge as the OOD for MCP gets going. But for API considerations we see two classes: í Mcp class í McpMsg class mcp-design-16
9 MCP Java API for IAMC Server æ public McpString cando, String Accept Constructor. Initializes an object, in class Mcp, to receive input from standard input System.in and produce output to standard output System.out. The standard IO streams will be used for binary IO readingwriting bytes. æ public McpString cando, String Accept, InputStream in, OutputStream out Constructor. Initializes an Mcp object to perform IO with the given streams. æ McpMsg getcommand Retrieves the next command from client as an McpMsg. æ boolean putresultmcpmsg m Sends the computational result packed in the message m to the client. mcp-design-17 æ McpMsg getanswermcpmsg question Retrieves the answer from client to the given question. æ void readyboolean flag Indicating to client that server is ready for additional work after aborting for example or is not ready engine is down for example. æ void terminate Indicating to client that server is ænished and disconnecting. æ void pingclient Requesting client status. Assumes clinet is dead after a preset timeout interval. æ Stringëë acceptlist Returning the accept list from the client. mcp-design-18
10 MCP Java API for IAMC Client æ public McpString Accept, String server Constructor. Constructor. Initializes an Mcp object to connect to the given server domain name. æ public McpString Accept, int server Constructor. Constructor. Initializes an Mcp object to connect to the given server IP address. æ boolean synccommandmcpmsg cmd Sends the command, given as an McpMsg, to the server in synchronous mode. æ int asynccommandmcpmsg cmd Sends the command, given as an McpMsg, to the server in asynchronous mode. Returns the sequence number as id for the command. æ McpMsg getmsg Retrieves the computational result, a question from the server. mcp-design-19 æ boolean abortëint ië Aborts the on-going synccommand call or the indicated asynccomand. This also sends a control msg to the server to abort the target computation. Returns true on server acknowdedgement. æ void terminate Indicating to server that client is ænished and disconnecting. æ void pingserver Requesting server status. Assumes server is dead after a preset timeout interval. æ Stringëë candolist Returning the can-do list from the server. mcp-design-20
11 Further Work æ More thorough requirement analysis æ OOD of MCP Layer æ Testing the design agast requirements æ OOP of Java-based MCP Layer æ Implementing and testing MCP Layer prototype mcp-design-21
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