Log Output — Method boundary category

Section 2 of 6 Schema

Method boundary category

Declarative interception with [LogMethod] generates structural logs for method execution states: ENTER, EXIT (on success), and EXCEPTION (on failure). Category: "MethodBoundary".

Pathway 1 — successful execution

When a method runs and completes without throwing errors:

Success flow

[Start Method Call]
       │
       ▼
 1. OnEntry(args)       <-- Generates "ENTER" Log
       │
       ▼
 [Method Executes]      <-- Target method body runs
       │
       ▼
 2. OnSuccess(args)     <-- Generates "EXIT" Log (Success & Duration)
       │
       ▼
 3. OnExit(args)        <-- Final cleanup hook (always runs)

Pathway 2 — exceptional execution

When an unhandled exception is thrown inside the method body:

Exception flow

[Start Method Call]
       │
       ▼
 1. OnEntry(args)       <-- Generates "ENTER" Log
       │
       ▼
 [Method Executes]      <-- Target method body runs (Throws Exception)
       │
       ▼
 2. OnException(args)   <-- Generates "EXCEPTION" Log (Error & StackTrace)
       │
       ▼
 3. OnExit(args)        <-- Final cleanup hook (always runs)

Below are the exact structured log arrays emitted during execution. Notice how logNum sequences chronologically within the shared traceId context.

Pathway 1 logs — success sequence

When a decorated method completes successfully, it emits these two log objects in order:

ENTER + EXIT

[
  {
    "timestamp": "2026-07-30T19:55:05.150Z",
    "level": "Information",
    "category": "MethodBoundary",
    "message": "ENTER - Processing billing validation",
    "traceId": "fa7dedf4-ec83-4b6e-a3f3-01883f7047b6",
    "spanId": "9b12a83f-42e1-48bf-a1f9-cf12da9f9210",
    "logNum": 1,
    "methodName": "BillingService.ValidateSubscription",
    "data": {
      "caller": "ProjectsController.GetProjects",
      "parameter": {
        "projectId": "491cc020-b2d7-4eca-8245-06e4361ee6f4",
        "tier": "Enterprise"
      }
    }
  },
  {
    "timestamp": "2026-07-30T19:55:05.165Z",
    "level": "Information",
    "category": "MethodBoundary",
    "message": "EXIT - Processing billing validation",
    "traceId": "fa7dedf4-ec83-4b6e-a3f3-01883f7047b6",
    "spanId": "9b12a83f-42e1-48bf-a1f9-cf12da9f9210",
    "logNum": 2,
    "duration": "15.02ms",
    "methodName": "BillingService.ValidateSubscription",
    "data": {
      "returnValue": {
        "isValid": true,
        "expiresAt": "2027-07-30T00:00:00Z"
      }
    }
  }
]

Pathway 2 logs — exception sequence

When a decorated method throws an unhandled exception, it emits these two log objects:

ENTER + EXCEPTION

[
  {
    "timestamp": "2026-07-30T19:55:05.150Z",
    "level": "Information",
    "category": "MethodBoundary",
    "message": "ENTER - Processing billing validation",
    "traceId": "fa7dedf4-ec83-4b6e-a3f3-01883f7047b6",
    "spanId": "9b12a83f-42e1-48bf-a1f9-cf12da9f9210",
    "logNum": 1,
    "methodName": "BillingService.ValidateSubscription",
    "data": {
      "caller": "ProjectsController.GetProjects",
      "parameter": {
        "projectId": "491cc020-b2d7-4eca-8245-06e4361ee6f4",
        "tier": "Enterprise"
      }
    }
  },
  {
    "timestamp": "2026-07-30T19:55:05.167Z",
    "level": "Error",
    "category": "MethodBoundary",
    "message": "EXCEPTION - Processing billing validation",
    "traceId": "fa7dedf4-ec83-4b6e-a3f3-01883f7047b6",
    "spanId": "9b12a83f-42e1-48bf-a1f9-cf12da9f9210",
    "logNum": 2,
    "methodName": "BillingService.ValidateSubscription",
    "data": {
      "exception": "SubscriptionExpiredException: The enterprise subscription has expired.",
      "stackTrace": "   at ArgusLogs.BillingService.ValidateSubscription(Guid projectId, String tier) in C:\\BillingService.cs:line 45\n   at ProjectsController.GetProjects() in C:\\ProjectsController.cs:line 20"
    }
  }
]