WITS Adapter

Name: Use this required field to specify or change the name of this instance of this component. The name must be unique within the current EventFlow module. The name can contain alphanumeric characters, underscores, and escaped special characters. Special characters can be escaped as described in Identifier Naming Rules. The first character must be alphabetic or an underscore.

Operator: A read-only field that shows the formal name of the operator.

Class name: Shows the fully qualified class name that implements the functionality of this operator. If you need to reference this class name elsewhere in your application, you can right-click this field and select Copy from the context menu to place the full class name in the system clipboard.

Start options: This field provides a link to the Cluster Aware tab, where you configure the conditions under which this operator starts.

Enable Error Output Port: Select this checkbox to add an Error Port to this component. In the EventFlow canvas, the Error Port shows as a red output port, always the last port for the component. See Using Error Ports to learn about Error Ports.

Description: Optionally, enter text to briefly describe the purpose and function of the component. In the EventFlow Editor canvas, you can see the description by pressing Ctrl while the component's tooltip is displayed.

Use the settings in this tab to enable this operator or adapter for runtime start and stop conditions in a multi-node cluster. During initial development of the fragment that contains this operator or adapter, and for maximum compatibility with releases before 10.5.0, leave the Cluster start policy control in its default setting, Start with module.

Cluster awareness is an advanced topic that requires an understanding of StreamBase Runtime architecture features, including clusters, quorums, availability zones, and partitions. See Cluster Awareness Tab Settings on the Using Cluster Awareness page for instructions on configuring this tab.

Use the Concurrency tab to specify parallel regions for this instance of this component, or multiplicity options, or both. The Concurrency tab settings are described in Concurrency Options, and dispatch styles are described in Dispatch Styles.

Each shared adapter configuration must be under an element called WITS.conf with a name attribute of WitsAdapters. Following that, an element named section with a name attribute of WitsAdapter is required.

In the example below, long lines wrap for legibility.

The adapter configuration file must reside in your project's src/main/configurations directory.

name = "WITS.conf"
type = "com.tibco.ep.streambase.configuration.adapter"
version = "1.0.0"
configuration = {
          
// An adapter group type defines a collection of EventFlow adapter configurations, indexed by adapter type.
  AdapterGroup = {
        
// A collection of EventFlow adapter configurations, indexed by adapter type. 
// This object is required and must contain at least one configuration.
    adapters = {
          
// The root section for an EventFlow adapter configuration.
      WitsAdapters = {
          
// Section list. This array is optional and has no default value.
        sections = [
          
// A configuration for an EventFlow adapter named section.
        {
          
// Section name. The value does not have to be unique; that is, you can have multiple sections with the 
// same name in the same array of sections. This object is required.
          name = "WitsAdapter"
          
// Section for setting adapter properties. All values must be strings. This object is optional and 
// has no default value.
            settings = {
              baudRate = "9600"
              connectOnStartup = "true"
              dataBits = "8"
              dictionary = "WITSDictionary.json"
              doubleNullValue = ""
              heartBeatInterval = "30"
              heartBeatValue = "&&\r\n0111-9999\r\n!!\r\n"
              id = "Wits"
              intNullValue = ""
              lineSeparator = """
              """
              packetFooter = "!!"
              packetHeader = "&&"
              parity = "0"
              serialPortAppName = "WITS"
              serialPortName = "COM1"
              stopBits = "1"
              stringNullValue = "null"
              }
          }
        ]
      }
    }
  }
}

If a value is not present, the default is used. Those values listed without a default are required.

The WITS sample that comes with StreamBase includes a WITSDictionary.json file that includes the standard WITS record types and items. This base dictionary includes all the required information for the WITS adapters to perform based on the WITS specification and shows the standard WITS record and item types to get the adapters up and running. If your WITS connection has non-standard record types or items then this dictionary file should be modified to include those extensions.

The following shows the schema to which each dictionary must conform:

{
   "$schema":"http://json-schema.org/draft-04/schema#",
   "type":"object",
   "properties":{
      "IncludeDictionary":{
        "type":"array",
         "items":{
            "type":"object",
            "properties":{
               "File":{
                  "type":"string"
               }
            },
            "required":[
               "File"
            ]
         }       
      },
      "Records":{
         "type":"array",
         "items":{
            "type":"object",
            "properties":{
               "Rec":{
                  "type":"integer"
               },
               "Name":{
                  "type":"string"
               },
               "Description":{
                  "type":"string"
               },
               "Items":{
                  "type":"array",
                  "items":{
                     "type":"object",
                     "properties":{
                        "Item":{
                           "type":"integer"
                        },
                        "Description":{
                           "type":"string"
                        },
                        "LongMnemonic":{
                           "type":"string"
                        },
                        "ShortMnemonic":{
                           "type":"string"
                        },
                        "Type":{
                           "type":"string"
                        },
                        "Length":{
                           "type":"integer"
                        },
                        "MetricUnits":{
                           "type":"string"
                        },
                        "FPSUnits":{
                           "type":"string"
                        },
                     },
                     "required":[
                        "Item",
                        "LongMnemonic",
                        "ShortMnemonic",
                        "Type"                        
                     ]
                  }
               }
            },
            "required":[
               "Rec",               
               "Items"
            ]
         }
      }
   },
   "required":[
      "Records"
   ]
}
        

The following are the major categories of the dictionary file and an overview of their usage.