Argument Setter

Argument Setter is a type of Action plugin that allows one to create reusable pipelines by dynamically substituting the configurations that can be served by an HTTP Server. It uses the Macro capabilities provided by CDAP.

Usage

Following is a simple example of a configuration that can be served by HTTP server to this plugin.

{
  "arguments" : [
    { "name" : "input.path", "type" : "string", "value" : "/Users/nitin/Work/Demo/data/titanic.xlsx" },
    { "name" : "rulebook", "type" : "import", "value" : "http://localhost:11015/v3/namespaces/default/apps/yare/services/service/rulebook/MyRuleBook" },
    { "name" : "parser", "type" : "array", "value" :
      [
        "parse-as-excel body , true",
        "drop body",
        "set columns PassengerId,Survived,Pclass,Name,Sex,Age,SibSp,Parch,Ticket,Fare,Cabin,Embarked",
        "filter-row-if-matched Age Age"
        "cut-character Sex Sex 1",
        "uppercase Sex",
        "rename Sex Gender",
        "keep PassengerId, Name",
        "fill-null-or-empty Age 0"
      ]
    },
    {
      "name" : "output.schema", "type" : "schema", "value" :
      [
        { "name" : "PassengerId", "type" : "string", "nullable" : true},
        { "name" : "Name", "type" : "string", "nullable" : true}
      ]
    },
    { "name" : "dq.checks", "type" : "array", "value" :
      [
        "filter-rows-on regex-match Name .*James.*"
      ]
    },
    { "name" : "stage.path", "type" : "string", "value" : "titanic_excel"}
  ]
}

The configuration is made up of collection of Arguments and Arguments defines all the configurations for one or more pipelines qualified by macro names.

{
    "arguments" : [
        { argument }, { argument }, ..., {argument}
    ]
}

Each argument is made up of following fields

• Name -- Defines the name of the argument or macro name.
• Type -- Defines the type of argument. It can be either int, float, double, short, string, schema, char, array or map. &
• Value -- Defines the value based on the type.

Argument Types

Following are the argument types supported by the system:

Argument Type	Type Description
import	Defines the type that imports the value using a HTTP invocation
schema	Defines the value to be of schema type that is defined as combination of name, type and nullable
int	Defines the value as integer type
float	Defines the value as float type
double	Defines the value as double type
short	Defines the value as short type
string	Defines the value as string type
char	Defines the value as char type
array	Defines the value as array of string type
map	Defines the value of map