05 General Adapter Module

General Adapter Configuration

A key feature of DELFT-FEWS is its ability to run external modules to provide essential forecasting functionality. These modules may be developed by Delft Hydraulics as well as by other companies or institutions. The DELFT-FEWS system does not have any knowledge of the specific implementation of these modules. It is rather the central philosophy to have an open system, that is able to treat external modules as plug-ins that can be used if needed.

The General Adapter is the part of the DELFT-FEWS system that implements this feature. It is responsible for the data exchange with the modules and for executing the modules and their adapters. The central philosophy of the General Adapter is that it knows as little as possible of module specific details. Module specific intelligence is strictly separated from the DELFT-FEWS system. In this way an open system can be guaranteed. Module specific intelligence required by the module to run is vested in the module adapters.

Communication between the General Adapter and a module is established through the published interface (PI). The PI is an XML based data interchange format. The General Adapter is configured to provide the data required for a module to run in the PI format. A module adapter is then used to translate the data from the PI to the module native format. Vice versa, results will first be exported to the PI format by a module adapter before the General Adapter imports them back into DELFT-FEWS.

The General Adapter module can be configured to carry out a sequence of five types of tasks;

• Startup Activities. These activities are run prior to a module run and any export import of data. The activities defined are generally used to remove files from previous runs that may implicate the current run.
• Export Activities. These activities defined all items to be exported through the published interface XML formats to the external module, prior to the module or the module adapters being initialised.
• Execute Activities. The execute activities define the external executables or Java classes to be run. Tracking of diagnostics from these external activities is included in this section.
• Import Activities: These activities define all items to be imported following successful completion of the module run.
• Shutdown Activities. These activities are run following completion of all other activities The activities defined are generally used to remove files no longer required.

Figure 65 Schematic interaction between the General Adapter and an external module

When available as configuration on the file system, the name of the XML file for configuring an instance of the general adapter module called for example HBV_Maas_Forecast may be:

HBV_Maas_Forecast 1.00 default.xml

Figure 66 Elements of the General Adapter configuration

general

Root element of general settings.

activities

Root element for the activities to be defined. The activities are defined in a fixed order;

• startUpActivities
• exportActivities
• executeActivities
• importActivities
• shutDownActivities

General settings

Figure 67 Elements of the general section of the general adapter configuration

description

Optional description of the configuration. Used for reference purposes only.

rootDir

Root directory for the external module. Other directories can be defined relative to this rootDir using predefined tags (see comment box below).

workDir

Working directory to be used by the external module. When started this directory will be the current directory.

exportDir

Directory to export data from DELFT-FEWS to the external module. All Published Interface files will be written to this directory (unless overruled in naming the specific export files).

exportDataSetDir

Directory to export module datasets from DELFT-FEWS to the external module. A module dataset is a ZIP file, which will be unzipped using this directory as the root directory. If the zip file contains full path information, this will be included as s tree of subdirectories under this directory.

exportIdMap

ID of the IdMap used to convert internal parameterId's and locationId's to external parameter and location Id's. See section on configuration for Mapping Id's units and flags.

importDir

Directory to import result data from the external module to DELFT-FEWS. All Published Interface files will be read from this directory (unless overruled in naming the specific export files).

importIdMap

ID of the IdMap used to convert external parameterId's and locationId's to interna l parameter and location Id's. This may be defined to be the same as the import directory, but may also contain different mappings. See section on configuration for Mapping Id's units and flags.

dumpFileDir

Directory for writing dump files to. Dump Files are created when one of the execute activities fails. A dump file is a ZIP file which includes all the dumpDir directories defined. The dump file is created immediately on failure, meaning that all data and files are available as they are at the time of failure and can be used for analysis purposes. The ZIP file name is time stamped to indicate when it was created.

dumpDir

Directory to be included in the dump file. All contents of the directory will be zipped. Multiple dumpDir's may be defined.

NOTE: ensure that the dumpDir does not include the dumpFileDir. This creates a circular reference and may result in corrupted ZIP files.

diagnosticFile

File name and path of diagnostic files created in running modules. This file should be formatted using the Published Interface diagnostics file specification.

missVal

Optional specification of missing value identifier to be used in PI-XML exported to modules and imported from modules.

NOTE: it is assumed an external uses the same missing value identification for both import and export data.

convertDatum

Optional Boolean flag to indicate level data is used and produced by the module at a global rather than a local datum. The convention in DELFT-FEWS is that data is stored at a local datum. If set to true data in parameter groups supporting datum conversion will be converted on export to the global datum by adding the z coordinate of the location. (see definition of parameters and locations in Regional Configuration).

timeZone

The time zone with reference to UTC (equivalent to GMT) for all time dependent data communicated with the module. If not defined, UTC+0 (GMT) will be used.

timeZoneOffset

The offset of the time zone with reference to UTC (equivalent to GMT). Entries should define the number of hours (or fraction of hours) offset. (e.g. +01:00)

timeZoneName

Enumeration of supported time zones. See appendix B for list of supported time zones.

Startup Activities

Figure 68 Elements of the startUpActivities section of the General Adapter configuration.

purgeActivity

Root element of a purge activity used to delete files from previous runs. Multiple purge activities may be defined.

filter

Filter specifying files to be removed. Wildcards may be used.

Example (not the use of tags to define the directory names):

Export Activities

Figure 69 Elements of the ExportActivity section

Export activities are defined to allow exporting various data objects from DELFT-FEWS to the external modules. The list of objects that can be exported (see figure above) includes;

• exportStateActivity to export module states
• exportTimeSeriesActivity to export time series for scalar or polygon time series
• exportMapStacksActivity to export time series for grid time series
• exportProfilesActivity to export time series for longitudinal profile time series
• exportDataSetActivity to export module datasets
• exportParameterActivity to export module parameters

Note that for most types of exportActivity, multiple entries may exist.

Figure 70 Elements of the ExportStatesActivity section.

description

Optional description for the export states configuration. Used for reference purposes only.

moduleInstanceId

Id of the moduleInstance that has written the state to be exported. Generally this will be the same as the Id of the current instance of the General Adapter. This can also be the ID of another instance of the General Adapter. The latter is the case when using a state in a forecast run that has been written in an historical run.

stateExportDir

Directory to export the states to. This is the export location for the (binary) state files.

stateConfigFile

Name (and location) of the PI-XML file describing the states. If the directory location is not explicitly specified the file will be written in the exportDir defined in the general section.

stateLocations

Root element for the description of the state. Both a read location and a write location will need to be defined. This allows the name of the file(s)/directory to be different on read and write. Multiple locations may be defined, but these must all be of the same type.

Attributes;

• type: indication of type of state to be imported. This may either be "directory" or "file". Note that multiple locations are supported only if type is "file".
  

  stateLocation

  Root element of a state location
  

  readLocation

  Location where the external module will read the state. This is the location (and name of file/directory) where the General Adapter writes the state.
  

  writeLocation

  Location where the external module is expected to write the state. This is the location (and name of file/directory) where the General Adapter expects to read the state.
  

  stateSelection

  Root element to specify how a state to be exported to the external module is to be selected. Two main groups are available, cold states and warm states. Only one of these types can be specified. Note that if a warm state selection is specified and an appropriate warm state cannot be found, a cold state will be exported by default.
  

  coldState

  Root element for defining the stateSelection method to always export a cold state.
  

  coldState:groupId

  Id of the group of cold states to be used. This must be a groupId as defined in the ColdModuleInstanceStateGroups configuration (see Regional Configuration).
  

  coldState:startDate

  Definition of the start date of the external module run when using the cold state. This startDate is specified relative to the start time of the forecast run. A positive startDate means it is before the start time of the forecast run.

Attributes;

• unit (enumeration of: second, minute, hour, day, week)
• multiplier defines the number of units given above.**
• divider same function as the multiplier, but defines fraction of units.**

warmState

Root element for defining the stateSelection method to search for the most suitable warm state.

warmState:stateSearchPeriod

Definition of the search period to be used in selecting a warm state. The database will return the most recent suitable warm state found within this search period.

Attributes;

• unit (enumeration of: second, minute, hour, day, week)
• start defines the start time relative to the start of the forecast run in number of units given above (negative is before start of forecast).**
• end defines the end time relative to the start of the forecast run in number of units given above (negative is before start of forecast).**
  

  coldStateTime

  Definition of the start time to use for a cold state if a suitable state is not found within the warm state search period.

Attributes;

• unit (enumeration of: second, minute, hour, day, week)
• value defines the start time of the cold state run relative to the start of the forecast run in number of units given above (negative is before start of forecast).**

Figure 71 Elements of the exportTimeSeries section

description

Optional description of the timeSeries export configuration.

exportFile

Name (and location) of the PI-XML file with exported time series. If the directory location is not explicitly specified the file will be written in the exportDir defined in the general section.

timeSerieSets

Root element for defining timeSerieSets to be exported.

timeSerieSets: timeSerieSet

TimeSeriesSets to be exported. These may contain either a (list of) locations or a locationSet. Multiple entries may be defined.

Figure 72 Elements of the ExportMapStacksActivity.

description

Optional description of the timeSeries export configuration.

exportFile

Name (and location) of the PI-XML file describing the map stack of the exported grid time series. If the directory location is not explicitly specified the file will be written in the exportDir defined in the general section.

gridFile

Root element for defining file name of grid to be exported

locationId

LocationId for grid to be exported.

gridName

Name of the files for the grid to be exported. For grid files where each time slice is stored in a different file, this name is the prefix for the full file name. The final file name is created using an index of files exported (e.g the file name for the 4^th^ time step is grid00000.004).

gridFormat

Format of the exported grid. Enumeration of options include;

• asc : for exporting to ARC-INFO ASCII grid format
• pcrgrid : for exporting to PCRaster native grid file format
• usgsdem : for exporting to USGS DEM format (BIL)
  

  timeSerieSet

  TimeSeriesSets to be exported. These should contain only one locationId. For exporting multiple grids, multiple exportMapStack activities should be defined.

exportProfilesActivity

Configuration of the exportProfiles activity is identical to the exportTimeSeries Activity.


Figure 73 Elements of the exportDataSets section

description

Optional description of the module dataset export configuration.

moduleInstanceId

Optional reference to the moduleInstanceId of the moduleDataSet to be exported. If not defined the moduleInstanceId of the current module instance is taken as a default (see section on Module Datasets and Parameters).

Figure 74 Elements of the exportParameter section

description

Optional description of the module parameter configuration.

moduleInstanceId

Optional reference to the moduleInstanceId of the moduleParameter to be exported. If not defined the moduleInstanceId of the current module instance is taken as a default (see section on Module Datasets and Parameters)

fileName

Name (and location) of the PI-XML file with exported parameters. If the directory location is not explicitly specified the file will be written in the exportDir defined in the general section.

Execute Activities

Figure 75 Elements of the ExecuteActivity configuration

executeActivity

Root element for the definition of an execute activity. For each external executable or Java class to run, an executeActivity must be defined. Multiple entries may exist.

description

Optional description for the activity. Used for reference purposes only.

command

Root element to define command to execute.

executable

File name and location of the executable to run the command is an executable. The file name may include environment variables, as well as tags defined in the general adapter or on the global.properties.

className

Name of Java Class to run if the command defined as a Java class. This class may be made available to DELFT-FEWS in a separate JAR file in the \Bin directory. It must implement the ModuleAdapterRunnable interface to run.

arguments

Root element for defining arguments to be passed to the executable/Java class

argument

Definition of an argument to be passed to the executable/Java Class

environmentVariables

Root element for defining environment variable prior to running the executable/Java class

environmentVariable

Definition of an environment variable prior to running the executable/Java class

environmentVariable.name

Name of environment variable

environmentVariable.value

Value of environment variable

timeOut

Optional timeout to be used when running module (in milliseconds). If run time exceeds timeout it will be terminated and the run considered as having failed.

GA Variables

Several variable are available to be used as a argument to an external program. These are:

#time_0# Time zero or forecast time. Note: deprecated, use %TIME0%\ instead
%TASK_ID% current task id
%TIME_ZONE_OFFSET_SECONDS%\ the offset with GMT in seconds
%WORK_DIR%\ work directory of general adapter

Import Activities

Figure 76 Elements of the ImportActivities configuration

description

Optional description of import activity. Used for reference purposes only

importStateActivity

Root element for importing modules states resulting from the run of the external modules. Multiple elements may be defined. If no state is to be imported (for example in forecast run as opposed to state run), then the element should not be defined.

stateConfigFile

Name (and location) of the PI-XML file describing the states to be imported. If the directory location is not explicitly specified the file will be expected to be read from the importDir defined in the general section. This file contains all necessary information to define state type and location. The moduleInstanceId of the state imported is per definition the current module instance.

importTimeSeriesActivity

Root element for importing scalar and polygon time series resulting from the run of the external modules. Multiple elements may be defined.

importMapStacksActivity

Root element for importing grid time series resulting from the run of the external modules. Multiple elements may be defined.

importProfilesActivity

Root element for importing longitudinal profile time series resulting from the run of the external modules. Multiple elements may be defined.

importFile

PI-XML file describing the time series to be imported. The file contains all information on type of data to be imported (scalar, longitudinal, grid, polygon). For all data types except the grid the file also contains the time series data If the directory location is not explicitly specified the file will be expected to be read from the importDir defined in the general section.

Shutdown Activities

Figure 77 Elements of the Shutdown Activities configuration
This activity is the identical to the startUpActivities. The only difference is that these are carried out after the module run and import of data. See definition of StartUp activities for configuration.