Overview

All functionality used be DELFTby Delft-FEWS in processing dynamic data, running external forecasting modules and running external forecasting modules is configured
in adapters is achieved with use of modules and workflows. A Module is a tool, and a configuration on how to apply it (with what options and on what data) is a module instance. These are then executed in a logical sequence as defined in a workflow.

A variety of modules is available in DELFT-FEWS to provide specific functionality. Examples include interpolation, running external modules, data import etc. The modules available are defined in the ModuleDescriptors in the System configuration. This defines the Java classes used to run each module, and assigns a recognizable name for that module (e.g. Transformation). These Java classes implement the workflow plug-in interface to DELFT-FEWS. The list of available modules can be extended through adding classes implementing this plug-in interface.

To carry out a specific piece of data processing, and instance of a module is configured. This instance specifies the input data, the output data and the required steps in processing the data. Each module instance is given a unique name with which it is identified in the module instance section of the configuration. To link an instance of a module to the type of module available, the module instance is registered in the ModuleInstanceDescriptors in the Regional Configuration section.

The list of module instances in
DELFT-FEWS includes:

• Interpolation Module
• Transformation Module
• Import Module
• Export Module
• General Adapter Module
• Lookup Table Module
• Correlation Module
• Error Correction Module
• Report Module
• Report Export Module
• Performance Indicator Module

A Workflow is a sequence of module instances and thus describes in what order the module configurations should be executed. A common way to start a workflow is in the manual forecast dialog or by running a node in the Interactive forecast dialog (IFD).

The availability of modules is set, but module instances and workflows are configured (Note that multiple module instances can make use of the same module). For a new module instance or workflow, make a new xml file in the ModuleConfigFiles or WorkflowFiles folder, and make an entry in the ModuleInstanceDescriptors or WorkflowDescriptors file. The entry should have an id that corresponds to the xml file name that was just created. Look at the schema below for more details.

The module used in the module config file is defined by the xsd schema. This is the schemaLocation attribute in the first element in the module config xml file. What schema corresponds to what module can be found in the documentation of each module. A list of all modules can be found in the content list.

• ModuleConfigFiles = Specify how that module instance must be run
• ModuleInstanceDescriptors = Lists all module instances that can be run (every entry corresponds with one file in the ModuleConfigFiles folder)
   
• WorkflowFiles = Lists which module instances should be run for that workflow
• WorkflowDescriptors = Lists all workflows (every entry corresponds with one file in the WorkflowFiles folder)
  

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