/ 
Bio-Phylo-0.41
River stage two • 9 direct dependents • 18 total dependents
/ Bio::Phylo::PhyloWS::Service

NAME

Bio::Phylo::PhyloWS::Service - Base class for phylogenetic web services

SYNOPSIS

# inside a CGI script:
use CGI;
use Bio::Phylo::PhyloWS::Service::${child};

my $service = Bio::Phylo::PhyloWS::Service::${child}->new( '-url' => $url );
$service->handle_request(CGI->new);

DESCRIPTION

This is the base class for services that implement the PhyloWS (http://evoinfo.nescent.org/PhyloWS) recommendations. Such services should subclass this class and implement any relevant abstract methods. Examples of this are Bio::Phylo::PhyloWS::Service::Tolweb and Bio::Phylo::PhyloWS::Service::Ubio.

PhyloWS services are web services for phylogenetics that provide two types of functionality:

Record lookup

Services that implement record lookups are services that know how to process URL requests of the form /phylows/$object_type/$authority:$identifier?format=$format, where $object_type is a string representing the type of object that is returned, e.g. 'tree', 'matrix', 'taxon', etc., $authority is a naming authority such as TB2 for TreeBASE2, $identifier is a local identifier for the object, for example an accession number, and $format is a serialization format such as 'nexml'.

In order to provide this functionality, subclasses of this class must implement a method called get_record which is passed at least a named -guid argument that provides the local identifier. The get_record method must return a Bio::Phylo::Project object, which is subsequently serialized in the requested format by the handle_request method provided here.

Services that implement record searches are services that know how to process URL requests of the form /phylows/$object_type/find?query=$query&format=$format, where $object_type is a string representing the type of object to search for, $query is a CQL query (http://www.loc.gov/standards/sru/specs/cql.html), and $format is the serialization format in which the returned results are represented.

In order to provide this functionality, subclasses of this class must implement a method called get_query_result, which is passed the $query parameter and which must return a Bio::Phylo::Project object that combines the search results (e.g. in a single taxa block for taxon searches).

CQL has different levels of support, services may only implement certain levels of support. The example services Bio::Phylo::PhyloWS::Service::Tolweb and Bio::Phylo::PhyloWS::Service::Ubio only proved Level 0, term-only support, meaning that $query is simply a term such as Homo+sapiens.

Child classes that implement some or all of the functionality described above can subsequently be made operational on a web server by calling them from a simple CGI script as shown in the SYNOPSIS section, where $child must be substituted by the actual class name of the child class (e.g. Tolweb). The $url parameter that is passed to the constructor is usually simply the URI of the CGI script, i.e. the environment variable $ENV{'SCRIPT_URI'} under most standard HTTP servers.

REQUEST HANDLER

handle_request()
Type    : Request handler
Title   : handle_request
Usage   : $service->handle_request($cgi);
Function: Handles a service request
Returns : prints out response and exits
Args    : Required: a CGI.pm object

ACCESSORS

get_result()

Gets a phylows result, either a record lookup or a query result, depending on the internal state of the service object

Type    : Accessor
Title   : get_result
Usage   : my $proj = $obj->get_result;
Function: Gets a phylows result
Returns : Bio::Phylo::Project
Args    : None
Comments:
get_record()

Gets a phylows record by its id

Type    : Abstract Accessor
Title   : get_record
Usage   : my $record = $obj->get_record( -guid => $guid );
Function: Gets a phylows record by its id
Returns : Bio::Phylo::Project
Args    : Required: -guid => $guid, 
          Optional: -format => $format
Comments: This is an ABSTRACT method that needs to be implemented
          by a child class
get_query_result()

Gets a phylows cql query result

Type    : Abstract Accessor
Title   : get_query_result
Usage   : my $result = $obj->get_query_result( $query );
Function: Gets a query result 
Returns : Bio::Phylo::Project
Args    : Required: $query
Comments: This is an ABSTRACT method that needs to be implemented
          by a child class
get_supported_formats()

Gets an array ref of supported formats

Type    : Abstract Accessor
Title   : get_supported_formats
Usage   : my @formats = @{ $obj->get_supported_formats };
Function: Gets an array ref of supported formats
Returns : ARRAY
Args    : NONE
Comments: This is an ABSTRACT method that needs to be implemented
          by a child class
get_redirect()

Gets a redirect URL if relevant

Type    : Accessor
Title   : get_redirect
Usage   : my $url = $obj->get_redirect;
Function: Gets a redirect URL if relevant
Returns : String
Args    : $cgi
Comments: This method is called by handle_request so that
          services can 303 redirect a record lookup to 
          another URL. By default, this method returns 
          undef (i.e. no redirect)
get_description()

Gets an RSS1.0/XML representation of a phylows record

Type    : Accessor
Title   : get_description
Usage   : my $desc = $obj->get_description;
Function: Gets an RSS1.0/XML representation of a phylows record
Returns : String
Args    : None
Comments: This method creates a representation of a single record
          (i.e. the service's base url + the record's guid)
          that can be serialized in whichever formats are 
          supported

SEE ALSO

Also see the manual: Bio::Phylo::Manual and http://rutgervos.blogspot.com

CITATION

If you use Bio::Phylo in published research, please cite it:

Rutger A Vos, Jason Caravas, Klaas Hartmann, Mark A Jensen and Chase Miller, 2011. Bio::Phylo - phyloinformatic analysis using Perl. BMC Bioinformatics 12:63. http://dx.doi.org/10.1186/1471-2105-12-63

REVISION

$Id: Service.pm 1660 2011-04-02 18:29:40Z rvos $