Perl

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.

Perl

use chilkat();

$success = 0;

$httpCurl = chilkat::CkHttpCurl->new();

# 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";
$httpCurl->AddFunction($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.
$planJson = chilkat::CkJsonObject->new();
$planJson->put_EmitCompact(0);

$success = $httpCurl->ExaminePlan($targetCurl,$planJson);

# Success is expected to be 1.
print "success = " . $success . "\r\n";

print $planJson->emit() . "\r\n";

# 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": []
#   }]
# }