Emit Data Structures

The response of a Service takes place via a utility called SmeupDataStructureWriter. This class is injected into each function method and supports the output of data structures via streaming.

Emit a Tree Data Structure

You can use the method writeDataNode(node: SmeupDataNode) to return a node of a tree data structure.

async function methodThatReturnTree(
  _fun: Fun,
  _context: ExecutionContext,
  printer: SmeupDataStructureWriter
) {
  printer.writeDataNode({
    children: [{
      children: [],
      value: "Nested node (1.1)"
    }],
    obj: {
      t: "",
      p: "",
      k: "",
    },
    value: "Node 1",
  });

    printer.writeDataNode({
    children: [],
    obj: {
      t: "",
      p: "",
      k: "",
    },
    value: "Node 2",
  });
}

Result:

|
└-Node 1
└─── Nested node (1.1)
|
└-Node 2

Emit a Data Table Structure

The data table is based on columns and rows and each rows contais cells. To emit a Data Table you can emit data in two steps:

• create and emit the data grid
• create and emit row by row

The method to emit data structure is the same as Tree. You can use the instance of SmeupDataStructurePrinter especially the methods:ù

• writeDataColumns(columns: SmeupDataColumns[]): return the columns of the grid
• writeDataRow(row: SmeupDataRow): return one row

async function methodThatReturnDataTable(
  _fun: Fun,
  _context: ExecutionContext,
  printer: SmeupDataStructureWriter
) {
  printer.writeDataColumns([
    {
      name: "ID",
      title: "Contact ID",
    },
    {
      name: "NAME",
      title: "Contact Name",
    },
  ]);
  printer.writeDataRow({
    cells: {
      COL1: {
        value: "ROSMAR",
        obj: {
          t: "",
          p: "",
          k: "",
        },
      },
      COL2: {
        value: "Rossi Mario",
        obj: {
          t: "",
          p: "",
          k: "",
        },
      },
    },
  });
}

Code	Name
ROSMAR	Rossi Mario
BIAMAR	Bianca Maria