| version 1.1, 1999/12/23 10:25:08 |
version 1.9, 2000/01/17 00:48:06 |
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| % $OpenXM$ |
% $OpenXM: OpenXM/doc/issac2000/openxm-clients.tex,v 1.8 2000/01/16 10:58:19 takayama Exp $ |
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\section{OpenXM Clients} |
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\subsection{Risa/Asir} |
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Risa/Asir provides a launcher to invoke an OpenXM server and to set up the |
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communication between the server and itself. As a client, |
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it provides many built-in functions for communication. |
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\subsubsection{Setting up servers} |
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{\tt ox\_launch} is a general purpose launcher. This application |
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invokes a server and sets up the server-client communication |
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according to the protocol stated in Section \ref{launcher}, then |
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itself becomes a control server. |
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Several facilities related to {{\tt ox\_launch}} are provided |
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as built-in functions of Risa/Asir: a function to invoke a server |
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automatically from a give host name and a server name, and a set |
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of functions to execute the port generation, {\tt bind}, {\tt listen}, |
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{\tt connect} and {\tt accept} operations on sockets individually. |
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|
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\subsubsection{Manipulating servers} |
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Fundamental operations on OpenXM servers are |
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exchange of {\tt OX} data and sending of {\tt SM} commands. |
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The following functions |
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are provided to execute these primitive operations: |
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{\tt ox\_push\_cmo()} for pushing data to a server, |
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{\tt ox\_push\_cmd()} for sending an {\tt SM} command to a server |
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and {\tt ox\_get()} for receiving data from a stream. |
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|
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Some operations including the reset operation are realized by |
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combining these primitives. Among them, frequently used ones are |
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provided as built-in functions. We show several ones. |
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|
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\begin{itemize} |
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\item {\tt ox\_pop\_cmo()} |
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|
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It requests a server to send data on the stack to the stream, then |
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it receives the data from the stream. |
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|
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\item {\tt ox\_cmo\_rpc()} |
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After pushing the name of a function, arguments and the number of the |
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arguments to the stack of a server, it requests the server to execute |
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the function. It does not wait the termination of the function call. |
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|
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\item {\tt ox\_reset()} |
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After sending {\tt SM\_control\_reset\_connection} to a control server, |
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it completes the operations stated in Section \ref{control}. |
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\end{itemize} |
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Furthermore {\tt ox\_select()} is provided to detect streams ready for |
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reading. It is realized by the {\tt select()} system call and is used |
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to avoid blocking on read operations. |
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|
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\subsection{Mathematica} |
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|
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We provide an OpenXM client {\tt math2ox} written as an external module |
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for Mathematica. |
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The module {\tt math2ox} communicates with Mathematica by MathLink and |
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with any OpenXM server by the OpenXM protocol. |
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By using the module {\tt math2ox}, |
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we can call OpenXM servers from Mathematica; |
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here is a demonstration of a computation of the de Rham cohomology groups |
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of ${\bf C}^2 \setminus V(x^3-y^2)$ from Mathematica. |
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{\footnotesize |
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\begin{verbatim} |
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In[1]:= Install["math2ox"] |
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In[2]:= OxStart["../lib/sm1/bin/ox_sm1_forAsir"] |
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In[3]:= OxExecute[" [(x^3-y^2) (x,y)] deRham "] |
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In[4]:= OxPopString[] |
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Out[4]= [ 1 , 1 , 0 ] (* The dimension of |
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cohomology groups *) |
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\end{verbatim} |
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} |
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|
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The {\tt math2ox} adds the following functions to Mathematica. |
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\begin{quote} |
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{\tt OxStart[s\_String]} \\ |
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{\tt OxStartInsecure[s\_String]} \\ |
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{\tt OxExecuteString[s\_String]} \\ |
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{\tt OxParse[s\_String]} \\ |
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{\tt OxGet[]} \\ |
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{\tt OxPopCMO[]} \\ |
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{\tt OxPopString[]} \\ |
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{\tt OxClose[]} \\ |
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{\tt OxReset[]} |
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\end{quote} |
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Although the list of functions speaks itself, |
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we add some explanations. |
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The function {\tt OxPopCMO[]} executes the same operation |
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as {\tt ox\_pop\_cmo()} in Risa/Asir; |
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it pops data from the server stack. |
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The {\tt OxGet[]} receives an OX data message |
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and returns its translation to an local object. |
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The function {\tt OxParse[]} helps debugging to connect Mathematica |
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and ox servers. |
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By using the function, one can send OX messages, |
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written by the OX expression, to a server. |
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OX expressions are Lisp-like expressions for OX messages and are defined |
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in~\cite{noro-takayama}. |
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