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| 55 | <H2><A NAME="SECTION00132210000000000000000"></A><A NAME="serverproxy-objects"></A> |
| 56 | <BR> |
| 57 | 11.22.1 ServerProxy Objects |
| 58 | </H2> |
| 59 | |
| 60 | <P> |
| 61 | A <tt class="class">ServerProxy</tt> instance has a method corresponding to |
| 62 | each remote procedure call accepted by the XML-RPC server. Calling |
| 63 | the method performs an RPC, dispatched by both name and argument |
| 64 | signature (e.g. the same method name can be overloaded with multiple |
| 65 | argument signatures). The RPC finishes by returning a value, which |
| 66 | may be either returned data in a conformant type or a <tt class="class">Fault</tt> or |
| 67 | <tt class="class">ProtocolError</tt> object indicating an error. |
| 68 | |
| 69 | <P> |
| 70 | Servers that support the XML introspection API support some common |
| 71 | methods grouped under the reserved <tt class="member">system</tt> member: |
| 72 | |
| 73 | <P> |
| 74 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 75 | <td><nobr><b><tt id='l2h-3699' xml:id='l2h-3699' class="method">system.listMethods</tt></b>(</nobr></td> |
| 76 | <td><var></var>)</td></tr></table></dt> |
| 77 | <dd> |
| 78 | This method returns a list of strings, one for each (non-system) |
| 79 | method supported by the XML-RPC server. |
| 80 | </dl> |
| 81 | |
| 82 | <P> |
| 83 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 84 | <td><nobr><b><tt id='l2h-3700' xml:id='l2h-3700' class="method">system.methodSignature</tt></b>(</nobr></td> |
| 85 | <td><var>name</var>)</td></tr></table></dt> |
| 86 | <dd> |
| 87 | This method takes one parameter, the name of a method implemented by |
| 88 | the XML-RPC server.It returns an array of possible signatures for this |
| 89 | method. A signature is an array of types. The first of these types is |
| 90 | the return type of the method, the rest are parameters. |
| 91 | |
| 92 | <P> |
| 93 | Because multiple signatures (ie. overloading) is permitted, this method |
| 94 | returns a list of signatures rather than a singleton. |
| 95 | |
| 96 | <P> |
| 97 | Signatures themselves are restricted to the top level parameters |
| 98 | expected by a method. For instance if a method expects one array of |
| 99 | structs as a parameter, and it returns a string, its signature is |
| 100 | simply "string, array". If it expects three integers and returns a |
| 101 | string, its signature is "string, int, int, int". |
| 102 | |
| 103 | <P> |
| 104 | If no signature is defined for the method, a non-array value is |
| 105 | returned. In Python this means that the type of the returned |
| 106 | value will be something other that list. |
| 107 | </dl> |
| 108 | |
| 109 | <P> |
| 110 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> |
| 111 | <td><nobr><b><tt id='l2h-3701' xml:id='l2h-3701' class="method">system.methodHelp</tt></b>(</nobr></td> |
| 112 | <td><var>name</var>)</td></tr></table></dt> |
| 113 | <dd> |
| 114 | This method takes one parameter, the name of a method implemented by |
| 115 | the XML-RPC server. It returns a documentation string describing the |
| 116 | use of that method. If no such string is available, an empty string is |
| 117 | returned. The documentation string may contain HTML markup. |
| 118 | </dl> |
| 119 | |
| 120 | <P> |
| 121 | Introspection methods are currently supported by servers written in |
| 122 | PHP, C and Microsoft .NET. Partial introspection support is included |
| 123 | in recent updates to UserLand Frontier. Introspection support for |
| 124 | Perl, Python and Java is available at the XML-RPC Hacks page. |
| 125 | |
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| 162 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> |
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