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<p><a id="X79B21F427ECE8C38" name="X79B21F427ECE8C38"></a></p>
<div class="ChapSects"><a href="chap4.html#X79B21F427ECE8C38">4 <span class="Heading">Message exchange by <strong class="pkg">SCSCP</strong></span></a>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap4.html#X8355ECDA7D5B1331">4.1 <span class="Heading">Communication with the <strong class="pkg">SCSCP</strong> server</span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap4.html#X86D913277AFF2366">4.1-1 StartSCSCPsession</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap4.html#X81EC8AAA78F62CB7">4.1-2 OMPutProcedureCall</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap4.html#X7ABD2EA6792279CF">4.1-3 SCSCPwait</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap4.html#X7E0FE0CF7DD2E00F">4.1-4 OMGetObjectWithAttributes</a></span>
</div></div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap4.html#X7A8771C084107E79">4.2 <span class="Heading">Communication with the <strong class="pkg">SCSCP</strong> client</span></a>
</span>
<div class="ContSSBlock">
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap4.html#X7C5C23A47A86EAEC">4.2-1 OMPutProcedureCompleted</a></span>
<span class="ContSS"><br /><span class="nocss"> </span><a href="chap4.html#X7FB47E3E86C7C9F9">4.2-2 OMPutProcedureTerminated</a></span>
</div></div>
<div class="ContSect"><span class="tocline"><span class="nocss"> </span><a href="chap4.html#X845ACA2578B2D808">4.3 <span class="Heading">Example: <strong class="pkg">SCSCP</strong> session</span></a>
</span>
</div>
</div>
<h3>4 <span class="Heading">Message exchange by <strong class="pkg">SCSCP</strong></span></h3>
<p>To ensure the message exchange as required by <strong class="pkg">SCSCP</strong> specification, the <strong class="pkg">SCSCP</strong> package extends the global record <code class="code">OMsymRecord</code> from the <strong class="pkg">OpenMath</strong> package with new entries to support <strong class="pkg">scscp1</strong> and <strong class="pkg">scscp2</strong> content dictionaries (<a href="chapBib.html#biBscscp1cd">[FHKLLRa]</a>, <a href="chapBib.html#biBscscp2cd">[FHKLR]</a>), and also service-dependent transient private content dictionaries (see Chapter <a href="chap5.html#X7DEE95317812A998"><span class="RefLink">5</span></a> for details about transient content dictionaries). It also overwrites some <strong class="pkg">OpenMath</strong> functions by their extended (but backwards compatible) versions, and adds some new <strong class="pkg">OpenMath</strong>-related functions to send and receive <strong class="pkg">SCSCP</strong> messages, documented below.</p>
<p>Note that functions documented in this chapter belong to the middle-level interface, and the user may find it more convenient to use functions developed on top of them and explained in next chapters.</p>
<p><a id="X8355ECDA7D5B1331" name="X8355ECDA7D5B1331"></a></p>
<h4>4.1 <span class="Heading">Communication with the <strong class="pkg">SCSCP</strong> server</span></h4>
<p><a id="X86D913277AFF2366" name="X86D913277AFF2366"></a></p>
<h5>4.1-1 StartSCSCPsession</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ StartSCSCPsession</code>( <var class="Arg">stream</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Returns: string</p>
<p>Initialises <strong class="pkg">SCSCP</strong> session and negotiates with the server about the version of the protocol. Returns the string with the <code class="code">service_id</code> (which may be used later as a part of the call identifier) or causes an error message if can not perform these tasks.</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">s := InputOutputTCPStream("localhost",26133);</span>
< input/output TCP stream to localhost:26133 >
<span class="GAPprompt">gap></span> <span class="GAPinput">StartSCSCPsession(s);</span>
"localhost:26133:5541"
<span class="GAPprompt">gap></span> <span class="GAPinput">CloseStream( s );</span>
</pre></div>
<p>After the call to <code class="func">StartSCSCPsession</code> the <strong class="pkg">SCSCP</strong> server is ready to accept procedure calls.</p>
<p><a id="X81EC8AAA78F62CB7" name="X81EC8AAA78F62CB7"></a></p>
<h5>4.1-2 OMPutProcedureCall</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ OMPutProcedureCall</code>( <var class="Arg">stream</var>, <var class="Arg">proc_name</var>, <var class="Arg">objrec</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Returns: nothing</p>
<p>Takes a stream <var class="Arg">stream</var>, the string <var class="Arg">proc_name</var> and a record <var class="Arg">objrec</var>, and writes to <var class="Arg">stream</var> an <strong class="pkg">OpenMath</strong> object <code class="code">procedure_call</code> for the procedure <var class="Arg">proc_name</var> with arguments given by the list <code class="code">objrec.object</code> and procedure call options (which should be encoded as <strong class="pkg">OpenMath</strong> attributes) given in the list <code class="code">objrec.attributes</code>.</p>
<p>This function accepts options <code class="code">cd</code> and <code class="code">debuglevel</code>.</p>
<p><code class="code">cd:="cdname"</code> may be used to specify the name of the content dictionary if the procedure is actually a standard <strong class="pkg">OpenMath</strong> symbol. Note that the server may reject such a call if it accepts only calls of procedures from the transient content dictionary, see <code class="func">InstallSCSCPprocedure</code> (<a href="chap5.html#X8031C2F4787E0C1A"><span class="RefLink">5.1-1</span></a>) for explanation). If the <code class="code">cdname</code> is not specified, <code class="code">scscp_transient_1</code> content dictionary will be assumed by default. The value of the <code class="code">debuglevel</code> option is an integer. If it is non-zero, the <code class="code">procedure_completed</code> message will carry on also some additional information about the call, for example, runtime and memory used.</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">t:="";; stream:=OutputTextString(t,true);;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">OMPutProcedureCall( stream, "WS_Factorial", rec( object:= [ 5 ], </span>
<span class="GAPprompt">></span> <span class="GAPinput"> attributes:=[ [ "call_id", "user007" ], </span>
<span class="GAPprompt">></span> <span class="GAPinput"> ["option_runtime",1000],</span>
<span class="GAPprompt">></span> <span class="GAPinput"> ["option_min_memory",1024], </span>
<span class="GAPprompt">></span> <span class="GAPinput"> ["option_max_memory",2048],</span>
<span class="GAPprompt">></span> <span class="GAPinput"> ["option_debuglevel",1], </span>
<span class="GAPprompt">></span> <span class="GAPinput"> ["option_return_object"] ] ) );;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">Print(t);</span>
<?scscp start ?>
<OMOBJ>
<OMATTR>
<OMATP>
<OMS cd="scscp1" name="call_id"/>
<OMSTR>user007</OMSTR>
<OMS cd="scscp1" name="option_runtime"/>
<OMI>1000</OMI>
<OMS cd="scscp1" name="option_min_memory"/>
<OMI>1024</OMI>
<OMS cd="scscp1" name="option_max_memory"/>
<OMI>2048</OMI>
<OMS cd="scscp1" name="option_debuglevel"/>
<OMI>1</OMI>
<OMS cd="scscp1" name="option_return_object"/>
<OMSTR></OMSTR>
</OMATP>
<OMA>
<OMS cd="scscp1" name="procedure_call"/>
<OMA>
<OMS cd="scscp_transient_1" name="WS_Factorial"/>
<OMI>5</OMI>
</OMA>
</OMA>
</OMATTR>
</OMOBJ>
<?scscp end ?>
</pre></div>
<p><a id="X7ABD2EA6792279CF" name="X7ABD2EA6792279CF"></a></p>
<h5>4.1-3 SCSCPwait</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ SCSCPwait</code>( <var class="Arg">stream</var>[, <var class="Arg">timeout</var>] )</td><td class="tdright">( function )</td></tr></table></div>
<p>Returns: nothing</p>
<p>This function may be used by the <strong class="pkg">SCSCP</strong> client to wait (using <code class="func">IO_select</code> (<a href="/usr/share/gap/pkg/io/doc/chap3.html#X81CA6EE88062010E"><span class="RefLink">IO: IO_select</span></a>)) until the result of the procedure call will be available from <var class="Arg">stream</var>. By default the timeout is one hour, to specify another value give it as the optional second argument in seconds. See the end of this chapter for the example.</p>
<p><a id="X7E0FE0CF7DD2E00F" name="X7E0FE0CF7DD2E00F"></a></p>
<h5>4.1-4 OMGetObjectWithAttributes</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ OMGetObjectWithAttributes</code>( <var class="Arg">stream</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Returns: record with components <code class="code">object</code> and <code class="code">attributes</code>, or <code class="keyw">fail</code></p>
<p>This function is similar to the function <code class="code">OMGetObject</code> from the <strong class="pkg">OpenMath</strong> package, and the main difference is that it is able to understand <strong class="pkg">OpenMath</strong> attribution pairs. It retrieves exactly one <strong class="pkg">OpenMath</strong> object from the stream <var class="Arg">stream</var>, and stores it in the <code class="code">object</code> component of the returned record. If the <strong class="pkg">OpenMath</strong> object has no attributes, the <code class="code">attributes</code> component of the returned record will be an empty list, otherwise it will contain pairs <code class="code">[attribute_name,attribute_value]</code>, where <code class="code">attribute_name</code> is a string, and <code class="code">attribute_value</code> is a <strong class="pkg">GAP</strong> object, whose type is determined by the kind of an attribute. Only attributes, defined by the SCSCP are allowed, otherwise an error message will be displayed.</p>
<p>If the procedure was not successful, the function returns <code class="keyw">fail</code> instead of an error message like the function <code class="func">OMGetObject</code> (<a href="/usr/share/gap/pkg/openmath/doc/chap2.html#X7FBDCB3C83BBB115"><span class="RefLink">OpenMath: OMGetObject</span></a>) does. Returning <code class="keyw">fail</code> is useful when <code class="code">OMGetObjectWithAttributes</code> is used inside accept-evaluate-return loop.</p>
<p>As an example, the file <code class="file">scscp/tst/omdemo.om</code> contains some <strong class="pkg">OpenMath</strong> objects, including those from the SCSCP Specification <a href="chapBib.html#biBSCSCP">[FHKLLRb]</a>. We can retrieve them from this file, preliminary installing some SCSCP procedures using the function <code class="func">InstallSCSCPprocedure</code> (<a href="chap5.html#X8031C2F4787E0C1A"><span class="RefLink">5.1-1</span></a>):</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">InstallSCSCPprocedure("WS_Factorial", Factorial );</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">InstallSCSCPprocedure("GroupIdentificationService", IdGroup );</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">InstallSCSCPprocedure("GroupByIdNumber", SmallGroup );</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">InstallSCSCPprocedure( "Length", Length, 1, 1 );</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">test:=Filename( Directory( Concatenation(</span>
<span class="GAPprompt">></span> <span class="GAPinput"> GAPInfo.PackagesInfo.("scscp")[1].InstallationPath,"/tst/" ) ), </span>
<span class="GAPprompt">></span> <span class="GAPinput"> "omdemo.om" );;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">stream:=InputTextFile(test);;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">OMGetObjectWithAttributes(stream); </span>
rec(
attributes := [ [ "option_return_object", "" ], [ "call_id", "5rc6rtG62" ] ]
, object := 6 )
<span class="GAPprompt">gap></span> <span class="GAPinput">OMGetObjectWithAttributes(stream);</span>
rec( attributes := [ ], object := 1 )
<span class="GAPprompt">gap></span> <span class="GAPinput">OMGetObjectWithAttributes(stream);</span>
rec( attributes := [ ], object := 120 )
<span class="GAPprompt">gap></span> <span class="GAPinput">OMGetObjectWithAttributes(stream);</span>
rec(
attributes := [ [ "call_id", "alexk_9053" ], [ "option_runtime", 300000 ],
[ "option_min_memory", 40964 ], [ "option_max_memory", 134217728 ],
[ "option_debuglevel", 2 ], [ "option_return_object", "" ] ],
object := [ 24, 12 ] )
<span class="GAPprompt">gap></span> <span class="GAPinput">OMGetObjectWithAttributes(stream);</span>
rec(
attributes := [ [ "call_id", "alexk_9053" ], [ "option_return_cookie", "" ]
], object := <pc group of size 24 with 4 generators> )
<span class="GAPprompt">gap></span> <span class="GAPinput">OMGetObjectWithAttributes(stream);</span>
rec( attributes := [ [ "call_id", "alexk_9053" ], [ "info_runtime", 1234 ],
[ "info_memory", 134217728 ] ], object := [ 24, 12 ] )
<span class="GAPprompt">gap></span> <span class="GAPinput">CloseStream( stream );</span>
</pre></div>
<p><a id="X7A8771C084107E79" name="X7A8771C084107E79"></a></p>
<h4>4.2 <span class="Heading">Communication with the <strong class="pkg">SCSCP</strong> client</span></h4>
<p><a id="X7C5C23A47A86EAEC" name="X7C5C23A47A86EAEC"></a></p>
<h5>4.2-1 OMPutProcedureCompleted</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ OMPutProcedureCompleted</code>( <var class="Arg">stream</var>, <var class="Arg">objrec</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Returns: <code class="keyw">true</code></p>
<p>Takes a stream <var class="Arg">stream</var>, and a record <var class="Arg">objrec</var>, and writes to <var class="Arg">stream</var> an <strong class="pkg">OpenMath</strong> object <code class="code">procedure_completed</code> with the result being <code class="code">objrec.object</code> and information messages (as <strong class="pkg">OpenMath</strong> attributes) given in the list <code class="code">objrec.attributes</code>.</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">t:="";; stream:=OutputTextString(t,true);;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">OMPutProcedureCompleted( stream, </span>
<span class="GAPprompt">></span> <span class="GAPinput"> rec(object:=120, </span>
<span class="GAPprompt">></span> <span class="GAPinput"> attributes:=[ [ "call_id", "user007" ] ] ) );</span>
true
<span class="GAPprompt">gap></span> <span class="GAPinput">Print(t);</span>
<?scscp start ?>
<OMOBJ>
<OMATTR>
<OMATP>
<OMS cd="scscp1" name="call_id"/>
<OMSTR>user007</OMSTR>
</OMATP>
<OMA>
<OMS cd="scscp1" name="procedure_completed"/>
<OMI>120</OMI>
</OMA>
</OMATTR>
</OMOBJ>
<?scscp end ?>
</pre></div>
<p><a id="X7FB47E3E86C7C9F9" name="X7FB47E3E86C7C9F9"></a></p>
<h5>4.2-2 OMPutProcedureTerminated</h5>
<div class="func"><table class="func" width="100%"><tr><td class="tdleft"><code class="func">‣ OMPutProcedureTerminated</code>( <var class="Arg">stream</var>, <var class="Arg">objrec</var>, <var class="Arg">error_cd</var>, <var class="Arg">error_type</var> )</td><td class="tdright">( function )</td></tr></table></div>
<p>Returns: nothing</p>
<p>Takes a stream <var class="Arg">stream</var>, and a record with an error message <var class="Arg">objrec</var> (for example <code class="code">rec( attributes := [ [ "call_id", "localhost:26133:87643:gcX33cCf" ] ],</code> <code class="code">object := "localhost:26133 reports : Rational operations: <divisor> must not be zero")</code> and writes to the <var class="Arg">stream</var> an <strong class="pkg">OpenMath</strong> object <code class="code">procedure_terminated</code> containing an error determined by the symbol <var class="Arg">error_type</var> from the content dictionary <var class="Arg">error_cd</var> (for example, <code class="code">error_memory</code>, <code class="code">error_runtime</code> or <code class="code">error_system_specific</code> from the <strong class="pkg">scscp1</strong> content dictionary (<a href="chapBib.html#biBscscp1cd">[FHKLLRa]</a>).</p>
<p>This is the internal function of the package which is used only in the code for the <strong class="pkg">SCSCP</strong> server to return the error message to the client.</p>
<p><a id="X845ACA2578B2D808" name="X845ACA2578B2D808"></a></p>
<h4>4.3 <span class="Heading">Example: <strong class="pkg">SCSCP</strong> session</span></h4>
<p>In the following example we start an <strong class="pkg">SCSCP</strong> session and perform ten procedure calls in a loop before closing that session. Note that we demonstrate the usage of the session ID <code class="code">sid</code> and the function <code class="code">RandomString</code> from the <strong class="pkg">OpenMath</strong> package to produce some unique call identifier. The call ID is a mandatory attribute for any procedure call, however, it is not nesessarily random; for example, it may be just a string with the number of the procedure call.</p>
<div class="example"><pre>
<span class="GAPprompt">gap></span> <span class="GAPinput">stream:=InputOutputTCPStream( "localhost", 26133 );</span>
< input/output TCP stream to localhost:26133 >
<span class="GAPprompt">gap></span> <span class="GAPinput">sid := StartSCSCPsession( stream );</span>
"localhost:26133:5541"
<span class="GAPprompt">gap></span> <span class="GAPinput">res:=[];</span>
[ ]
<span class="GAPprompt">gap></span> <span class="GAPinput">for i in [1..10] do</span>
<span class="GAPprompt">></span> <span class="GAPinput"> OMPutProcedureCall( stream, "WS_Factorial", </span>
<span class="GAPprompt">></span> <span class="GAPinput"> rec( object := [ i ], </span>
<span class="GAPprompt">></span> <span class="GAPinput"> attributes := [ [ "call_id", </span>
<span class="GAPprompt">></span> <span class="GAPinput"> Concatenation( sid, ":", RandomString(8) ) ] ] ) );</span>
<span class="GAPprompt">></span> <span class="GAPinput"> SCSCPwait( stream );</span>
<span class="GAPprompt">></span> <span class="GAPinput"> res[i]:=OMGetObjectWithAttributes( stream ).object;</span>
<span class="GAPprompt">></span> <span class="GAPinput">od;</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">CloseStream(stream);</span>
<span class="GAPprompt">gap></span> <span class="GAPinput">res;</span>
[ 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800 ]
</pre></div>
<p>Also note the usage of <code class="func">SCSCPwait</code> (<a href="chap4.html#X7ABD2EA6792279CF"><span class="RefLink">4.1-3</span></a>) to wait until the result of the computation will be available from <code class="code">stream</code>.</p>
<p>In this example we assumed that there is an <strong class="pkg">SCSCP</strong> server running at <code class="code">localhost</code>, port 26133. In the next chapter we will explain how to configure and run a <strong class="pkg">GAP</strong> <strong class="pkg">SCSCP</strong> server and how to interrogate it from a <strong class="pkg">GAP</strong> client to learn about its functionality. After that, we will proceed with the <strong class="pkg">SCSCP</strong> client functionality for the end-user.</p>
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