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SOAP::Server(3pm) User Contributed Perl Documentation SOAP::Server(3pm)
NAME
SOAP::Server - provides the basic framework for the transport-specific server classes to
build upon
DESCRIPTION
The SOAP::Server class provides the basic framework for the transport-specific server
classes to build upon. Note that in none of the code examples provided with SOAP::Lite is
this class used directly. Instead, it is designed to be a superclass within more specific
implementation classes. The methods provided by SOAP::Server itself are:
METHODS
new(optional key/value pairs)
$server = SOAP::Server->new(%options);
Creates a new object of the class. Various default instance values are set up, and
like many of the constructors in this module, most of the class methods described here
may be passed in the construction call by giving the name followed by the parameter
(or an array reference if there are multiple parameters).
action(optional new value)
$action = $server->action
Retrieves or sets the value of the action attribute on the server object. This
attribute is used when mapping the request to an appropriate namespace or routine. For
example, the HTTP library sets the attribute to the value of the SOAPAction header
when processing of the request begins, so that the find_target method described later
may retrieve the value to match it against the server's configuration. Returns the
object itself when setting the attribute.
myuri(optional new value)
$server->myuri("http://localhost:9000/SOAP");
Gets or sets the myuri attribute. This specifies the specific URI that the server is
answering requests to (which may be different from the value specified in action or in
the SOAPAction header).
serializer(optional new value)
deserializer(optional new value)
$serializer = $server->serializer;
$server->deserializer($new_deser_obj);
As with the client objects, these methods provide direct access to the serialization
and deserialization objects the server object uses to transform input and output from
and to XML. There is generally little or no need to explicitly set these to new
values.
options(optional new value)
$server->options({compress_threshold => 10000});
Sets (or retrieves) the current server options as a hash-table reference. At present,
only one option is used within the SOAP::Lite libraries themselves:
compress_threshold
The value of this option is expected to be a numerical value. If set, and if the
Compress::Zlib library is available to use, messages whose size in bytes exceeds
this value are compressed for transmission. Both ends of the conversation have to
support this and have it enabled.
Other options may be defined and passed around using this mechanism. Note that setting
the options using this accessor requires a full hash reference be passed. To set just
one or a few values, retrieve the current reference value and use it to set the
key(s).
dispatch_with(optional new value)
$server->dispatch_with($new_table);
Represents one of two ways in which a SOAP::Server (or derived) object may specify
mappings of incoming requests to server-side subroutines or namespaces. The value of
the attribute is a hash-table reference. To set the attribute, you must pass a new
hash reference. The hash table's keys are URI strings (literal URIs or the potential
values of the SOAPAction header), and the corresponding values are one of a class name
or an object reference. Requests that come in for a URI found in the table are routed
to the specified class or through the specified object.
dispatch_to(optional list of new values)
$server->dispatch_to($dir, 'Module', 'Mod::meth');
This is the more traditional way to specify modules and packages for routing requests.
This is also an accessor, but it returns a list of values when called with no
arguments (rather than a single one). Each item in the list of values passed to this
method is expected to be one of four things:
Directory path
If the value is a directory path, all modules located in that path are available
for remote use.
Package name
When the value is a package name (without including a specific method name), all
routines within the package are available remotely.
Fully qualified method name
Alternately, when the value is a package-qualified name of a subroutine or method,
that specific routine is made available. This allows the server to make selected
methods available without opening the entire package.
Object reference
If the value is an object reference, the object itself routes the request.
The list of values held by the dispatch_to table are compared only after the URI
mapping table from the dispatch_with attribute has been consulted. If the
request's URI or SOAPAction header don't map to a specific configuration, the path
specified by the action header (or in absence, the URI) is converted to a package
name and compared against this set of values.
objects_by_reference(optional list of new values)
$server->objects_by_reference(qw(My:: Class));
This also returns a list of values when retrieving the current attribute value, as
opposed to a single value.
This method doesn't directly specify classes for request routing so much as it
modifies the behavior of the routing for the specified classes. The classes that are
given as arguments to this method are marked to be treated as producing persistent
objects. The client is given an object representation that contains just a handle on a
local object with a default persistence of 600 idle seconds. Each operation on the
object resets the idle timer to zero. This facility is considered experimental in the
current version of SOAP::Lite.
A global variable/"constant" allows developers to specify the amount of time an object
will be persisted. The default value is 600 idle seconds. This value can be changed
using the following code:
$SOAP::Constants::OBJS_BY_REF_KEEPALIVE = 1000;
on_action(optional new value)
$server->on_action(sub { ...new code });
Gets or sets the reference to a subroutine that is used for executing the on_action
hook. Where the client code uses this hook to construct the action-request data (such
as for a SOAPAction header), the server uses the on_action hook to do any last-minute
tests on the request itself, before it gets routed to a final destination. When
called, the hook routine is passed three arguments:
action
The action URI itself, retrieved from the action method described earlier.
method_uri
The URI of the XML namespace the method name is labeled with.
method_name
The name of the method being called by the request.
on_dispatch(optional new value)
($uri, $name) = $server->on_dispatch->($request);
Gets or sets the subroutine reference used for the on_dispatch hook. This hook is
called at the start of the request-routing phase and is given a single argument when
called:
request
An object of the SOAP::SOM class, containing the deserialized request from the
client.
find_target
($class, $uri, $name) = $server->find_target($req)
Taking as its argument an object of the SOAP::SOM class that contains the deserialized
request, this method returns a three-element list describing the method that is to be
called. The elements are:
class
The class into which the method call should be made. This may come back as either
a string or an objectreference, if the dispatching is configured using an object
instance.
uri The URN associated with the request method. This is the value that was used when
configuring the method routing on the server object.
name
The name of the method to call.
handle
$server->handle($request_text);
Implements the main functionality of the serving process, in which the server takes an
incoming request and dispatches it to the correct server-side subroutine. The
parameter taken as input is either plain XML or MIME-encoded content (if MIME-encoding
support is enabled).
make_fault
return $server->makefault($code, $message);
Creates a SOAP::Fault object from the data passed in. The order of arguments is: code,
message, detail, actor. The first two are required (because they must be present in
all faults), but the last two may be omitted unless needed.
SOAP::Server::Parameters
This class provides two methods, but the primary purpose from the developer's point of
view is to allow classes that a SOAP server exposes to inherit from it. When a class
inherits from the SOAP::Server::Parameters class, the list of parameters passed to a
called method includes the deserialized request in the form of a SOAP::SOM object. This
parameter is passed at the end of the arguments list, giving methods the option of
ignoring it unless it is needed.
The class provides two subroutines (not methods), for retrieving parameters from the
SOAP::SOM object. These are designed to be called without an object reference in the
parameter list, but with an array reference instead (as the first parameter). The
remainder of the arguments list is expected to be the list from the method-call itself,
including the SOAP::SOM object at the end of the list. The routines may be useful to
understand if an application wishes to subclass SOAP::Server::Parameters and inherit from
the new class instead.
byNameOrOrder(order, parameter list, envelope)
@args = SOAP::Server::Parameters::byNameOrOrder ([qw(a b)], @_);
Using the list of argument names passed in the initial argument as an array reference,
this routine returns a list of the parameter values for the parameters matching those
names, in that order. If none of the names given in the initial array-reference exist
in the parameter list, the values are returned in the order in which they already
appear within the list of parameters. In this case, the number of returned values may
differ from the length of the requested-parameters list.
byName(order, parameter list, envelope)
@args = SOAP::Server::Parameters::byName ([qw(a b c)], @_);
Acts in a similar manner to the previous, with the difference that it always returns
as many values as requested, even if some (or all) don't exist. Parameters that don't
exist in the parameter list are returned as undef values.
EXAMPLE
The following is an example CGI based Web Service that utilizes a Perl module that
inherits from the "SOAP::Server::Parameters" class. This allows the methods of that class
to access its input by name.
#!/usr/bin/perl
use SOAP::Transport::HTTP;
SOAP::Transport::HTTP::CGI
->dispatch_to('C2FService')
->handle;
BEGIN {
package C2FService;
use vars qw(@ISA);
@ISA = qw(Exporter SOAP::Server::Parameters);
use SOAP::Lite;
sub c2f {
my $self = shift;
my $envelope = pop;
my $temp = $envelope->dataof("//c2f/temperature");
return SOAP::Data->name('convertedTemp' => (((9/5)*($temp->value)) + 32));
}
}
SEE ALSO
SOAP::SOM, SOAP::Transport::HTTP
ACKNOWLEDGEMENTS
Special thanks to O'Reilly publishing which has graciously allowed SOAP::Lite to republish
and redistribute large excerpts from Programming Web Services with Perl, mainly the
SOAP::Lite reference found in Appendix B.
COPYRIGHT
Copyright (C) 2000-2004 Paul Kulchenko. All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
AUTHORS
Paul Kulchenko (paulclinger AT yahoo.com)
Randy J. Ray (rjray AT blackperl.com)
Byrne Reese (byrne AT majordojo.com)
perl v5.26.2 2018-05-18 SOAP::Server(3pm)
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Under GNU General Public License
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