REST Services Data and tools on the Web have been exposed in both WSDL and REST. Taverna provides a custom processor for accessing REST services Peter.

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Presentation transcript:

REST Services Data and tools on the Web have been exposed in both WSDL and REST. Taverna provides a custom processor for accessing REST services Peter Li 1

REST REST stands for REpresentational State Transfer Web services with this type of interface typically expose some of the following four types of operations: GET - to get a resource POST - to make a new resource or to perform a request (such as search) PUT - to update a resource DELETE - to delete a resource 2

Adding a REST web service Expand the Service templates folder under Available services in the Service Panel. Select the REST service template and drag n drop it into the Workflow Diagram 3

Configuring a REST Service In a dialog box that pops up, configure the use of a REST service by adding: URL of the service, e.g. http://www.uniprot.org/uniprot/{id} (there should not be a .XML suffix) Type of the operation you want to perform on the service, e.g. GET The expected MIME data type as returned by the services. Select text/plain in this case. 4

Configuring a REST Service The URL of the service you enter is actually a template that can take configurable parameters In the current example, the name of the parameter is ‘id’ which is enclosed within a pair of braces Parameters are used when you do not know their value in advance, i.e. at the time of adding the service to the workflow diagram, and they depend on some of the previous services in the workflow. The value in braces will then be replaced with the actual value when the workflow is executed. Click ‘Apply’ and close to get back to the main workbench

Building a simple workflow using a REST service To complete the building of a simple workflow using the Uniprot REST web service, add: a workflow input for the REST service input port named ‘id’ workflow outputs for the responseBody and status output ports of the REST service activity The workflow should now look as follows: 6

Building a simple workflow using a REST service Now try running the workflow using an example Uniprot identifier such as Q99102.fasta Note that the presence of the .fasta suffix enables the protein sequence to be returned as text What happens when you don’t use the .fasta suffix? Try using other suffixes, e.g. xml, txt, rdf and gff Further information about the Uniprot REST service is available from http://www.uniprot.org/faq/28

Further exercises There are many more REST services available in bioinformatics Try to find these using BioCatalogue and test them using Taverna