(Classic ASP) Viewing a Simple Three-Step Execution Plan

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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.

Note: This example requires Chilkat v11.5.0 or greater.

For more information, see https://www.chilkatsoft.com/curl_dependency_engine.asp

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

set httpCurl = Server.CreateObject("Chilkat.HttpCurl")

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

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

' Define a helper function that produces customer_id from account_name.
fnName = "getCustomerId"
success = httpCurl.AddFunction(fnName,"curl -X GET https://api.example.com/customer-id?account={{account_name}}")
success = 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.
set planJson = Server.CreateObject("Chilkat.JsonObject")
planJson.EmitCompact = 0

success = httpCurl.ExaminePlan(targetCurl,planJson)

' Success is expected to be 1.
Response.Write "<pre>" & Server.HTMLEncode( "success = " & success) & "</pre>"

Response.Write "<pre>" & Server.HTMLEncode( planJson.Emit()) & "</pre>"

' 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": []
'   }]
' }

%>
</body>
</html>