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| − | '''[[Slicer3:Developers#Slicer_3_Projects | Back to Slicer3 Projects List ]]''' | + | <big>'''Note:''' We are migrating this content to the slicer.org domain - <font color="orange">The newer page is [https://www.slicer.org/wiki/Slicer3:Remote_Data_Handling here]</font></big> |
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| − | = ITK-based mechanism handling remote data (for command line modules, batch processing, and grid processing) =
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| − | = vtkMRMLStorageNode methods for handling remote data (for loading and saving data for interactive use) =
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| − | The first goal is to figure out what workflows to support, and a good implementation approach.
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| − | Currently, '''Load Scene''', '''Import Scene''', and '''Add Data''' options in Slicer all encapsulate two steps:
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| − | * locating a dataset, usually accomplished through a file browser, and
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| − | * selecting a dataset to initiate loading.
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| − | For loading remote datasets, the following options are available:
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| − | * break these two steps apart explicitly,
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| − | * bind them together under the hood,
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| − | * or support both of these paradigms.
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| − | ==Breaking apart "find data" and "load data":==
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| − | '''Possible workflow A'''
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| − | * User downloads .xcat or .xml (MRML) file to disk using the HID or an XNAT web interface
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| − | * From the Load Scene file browser, user selects the .xcat or .xml archive. If no locally cached versions exist, each remote file listed in the archive is downloaded to /tmp directory (always locally cached) by the Download Manager, and then loaded into Slicer via a vtkMRMLStorageNode method when download is complete.
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| − | '''Possible workflow B'''
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| − | * User downloads .xcat or .xml (MRML) file to disk using the HID or an XNAT web interface
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| − | * From the Load Scene file browser, user selects the .xcat or .xml archive. If no locally cached versions exist, each remote file in the archive is downloaded to /tmp (only if a flag is set) by the Download Manager, and loaded directly into Slicer via a vtkMRMLStorageNode method when download is complete.
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| − | '''Possible workflow C'''
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| − | * User locates a MRML file, .xcat archive, or individual dataset on the HID or an XNAT web interface
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| − | * User types the uri into the ''Load Scene'', ''Import Scene'', or ''Add Data'' interfaces.
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| − | * If no locally cached versions exist, each remote file in the archive is cached to /tmp by the Download Manager, and loaded directly into Slicer via a vtkMRMLStorageNode method when download is complete.
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| − | ==Bundling together "find data" and "load data":== | |
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| − | '''Possible workflow D'''
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| − | In this workflow, Slicer would make calls to HID or XNAT webservices to determine what data of interest is available... Questions:
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| − | * How might this work?
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| − | * Do we really want to re-implement functionality in the HID web interface?
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| − | * Maybe Slicer can implement a workflow (A-C) but also offer a simplified BIRN query interface that has functionality like:
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| − | ** Request BIRNIDs for all subjects who have a complete FIPS/FreeSurfer analysis
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| − | ** Request an xcat for one of these BIRNIDs
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| − | == Saving Data back to remote site ==
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| − | * Since we have no plan for where to save MRML files on HID, can we have a webservices function we can call from Slicer that writes a file to /dev/null on HID in the meanwhile?
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| − | == What data do we need in an .xcat file? ==
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| − | The xcede2.0 catalog should contain the following datasets for the BIRN QueryAtlas:
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| − | * One FreeSurfer "lh" model and one FreeSurfer "rh" model at most
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| − | * the FreeSurfer structural brain.mgz image volume
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| − | * the FreeSurfer example functional example_func.nii
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| − | * some FIPS-generated Statistical volumes
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| − | * the FreeSurfer aparc+aseg.mgz label map volume
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| − | * the FreeSurfer lh.aparc.annot annotation file
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| − | * the matrix to align the example_func + statistics to the brain.mgz: anat2exf.register.dat
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| − | These are found in the following places, according to the default FIPS/FreeSurfer directory structure.
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| − | The BIRN HID webservices shouldn't really need to know the subset of data that QueryAtlas needs... maybe the web interface can take a BIRN ID and create a FIPS/FreeSurfer xcede catalog with all FIPS/FreeSurfer uris, and Slicer can parse out the ones of interest, and download them?
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| − | [[ Slicer3:XCEDE_use_cases | See this page for more discussion of Slicer's use of Xcede catalogs ]]
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| − | = Asynchronous I/O Manager =
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