Dart Requires Chilkat v11.5.0+

Viewing a Simple Three-Step Execution Plan

See more CURL Examples

This example demonstrates a straightforward, valid dependency chain that results in a three-step execution plan. The goal is not to execute the requests, but to inspect how the plan is constructed using ExaminePlan.

The target curl command requires {{order_id}}. A helper function is defined to produce order_id, but it depends on customer_id. Another helper function produces customer_id, which depends on account_name.

Because account_name is provided as a known input, the dependency chain can be fully resolved:

• customer_id is obtained from account_name
• order_id is obtained from customer_id
• The target curl command uses order_id

When ExaminePlan is called, it builds and returns a three-step execution plan showing the order in which each function would be executed.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  var success = false;

  final httpCurl = CkHttpCurl();

  // The target curl command requires {{order_id}}.
  final targetCurl = 'curl -X GET https://api.example.com/orders/{{order_id}}';

  // Define a helper function that produces order_id from customer_id.
  var fnName = 'getOrderId';
  httpCurl.addFunction(fnName, 'curl -X GET https://api.example.com/order-id?customer={{customer_id}}');
  httpCurl.addOutput(fnName, 'order.id', 'order_id');

  // Define a helper function that produces customer_id from account_name.
  fnName = 'getCustomerId';
  httpCurl.addFunction(fnName, 'curl -X GET https://api.example.com/customer-id?account={{account_name}}');
  httpCurl.addOutput(fnName, 'customer.id', 'customer_id');

  // Provide the starting known input.
  httpCurl.setVar('account_name', 'acme');

  // Examine the execution plan without running any requests.
  final planJson = CkJsonObject();
  planJson.emitCompact = false;

  success = true;
  try {
    httpCurl.examinePlan(targetCurl, planJson);
  } on ChilkatException {
    success = false;
  }

  // Success is expected to be true.
  print('success = $success');

  print(planJson.emit());

  // Expected result:
  // 
  // {
  //   "plan": [{
  //     "function": "getCustomerId",
  //     "inputs": ["account_name"],
  //     "outputs": ["customer_id"]
  //   },{
  //     "function": "getOrderId",
  //     "inputs": ["customer_id"],
  //     "outputs": ["order_id"]
  //   },{
  //     "function": "targetCurl",
  //     "inputs": ["order_id"],
  //     "outputs": []
  //   }]
  // }
}