Angular Time Profiler Component

This challenge asks you to build a reusable Angular component that profiles the execution time of different parts of your application. A time profiler is invaluable for identifying performance bottlenecks and optimizing your Angular code. This component should display a timeline of function calls and their durations, allowing developers to quickly pinpoint slow operations.

Problem Description

You need to create an Angular component called TimeProfilerComponent that allows developers to mark the start and end times of code blocks and visualize their execution durations. The component should:

1. Provide a Service: Create a TimeProfilerService that handles the actual timing and data storage. This service should be injectable into the component.
2. start() and stop() Methods: The TimeProfilerService should expose start(name: string) and stop(name: string) methods. Calling start() with a name begins timing a block of code, and stop() with the same name ends the timing and records the duration.
3. Data Storage: The TimeProfilerService should store the timing data (name, start time, end time, duration) in an array.
4. Component Display: The TimeProfilerComponent should display the timing data in a user-friendly format, such as a table or a timeline visualization. The display should include the name of the timed block, the start time, the end time, and the duration.
5. Clear Data: Provide a button within the component to clear the stored timing data.
6. Error Handling: If stop() is called with a name that doesn't have a corresponding start(), display an error message.

Expected Behavior:

• Calling start() should not immediately produce any visual output.
• Calling stop() should add a new entry to the displayed data.
• The displayed data should be updated in real-time as start() and stop() are called.
• Clearing the data should remove all entries from the display.
• An error message should be displayed if stop() is called without a corresponding start().

Edge Cases to Consider:

• Calling stop() multiple times with the same name. (Should only record the first stop).
• Calling start() with the same name multiple times. (Should record each start and corresponding stop).
• Very short durations (ensure they are displayed correctly).
• Large numbers of timing entries (performance of the display).

Examples

Example 1:

Input:
TimeProfilerService.start("Component Initialization");
// Some initialization code
TimeProfilerService.stop("Component Initialization");
TimeProfilerService.start("Data Fetching");
// Some data fetching code
TimeProfilerService.stop("Data Fetching");
Output:
A table displaying two rows:
| Name               | Start Time      | End Time        | Duration (ms) |
|--------------------|-----------------|-----------------|---------------|
| Component Initialization | [Timestamp] | [Timestamp] | [Duration]     |
| Data Fetching       | [Timestamp] | [Timestamp] | [Duration]     |
Explanation: The component displays the durations of "Component Initialization" and "Data Fetching".

Example 2:

Input:
TimeProfilerService.start("Operation A");
TimeProfilerService.stop("Operation B"); // Incorrect name
Output:
An error message is displayed: "Error: No start found for 'Operation B'."
The table remains unchanged.
Explanation:  The `stop()` call fails because there's no corresponding `start()` for "Operation B".

Example 3:

Input:
TimeProfilerService.start("Long Task");
// Simulate a long-running task (e.g., using setTimeout)
TimeProfilerService.stop("Long Task");
TimeProfilerService.start("Long Task");
// Simulate another long-running task
TimeProfilerService.stop("Long Task");
Output:
A table displaying two rows:
| Name       | Start Time      | End Time        | Duration (ms) |
|------------|-----------------|-----------------|---------------|
| Long Task  | [Timestamp] | [Timestamp] | [Duration]     |
| Long Task  | [Timestamp] | [Timestamp] | [Duration]     |
Explanation:  Multiple starts and stops for the same name are recorded.

Constraints

• Angular Version: Use Angular 14 or higher.
• Component Reusability: The component should be designed to be easily reusable in different parts of your application.
• Performance: The display should remain responsive even with a large number of timing entries (consider using techniques like virtualization if necessary). Avoid unnecessary re-renders.
• Data Storage Limit: The TimeProfilerService should store a maximum of 100 timing entries. Older entries should be discarded when the limit is reached.
• Timing Resolution: Use performance.now() for more accurate timing than Date.now().

Notes

• Consider using Angular's change detection mechanisms effectively to minimize re-renders.
• Think about how to make the component configurable (e.g., allowing the user to specify the display format).
• You can use any UI library or styling techniques you prefer for the display.
• Focus on the core functionality of timing and displaying the data. Advanced features like filtering or sorting are not required for this challenge.
• The TimeProfilerService should be a singleton.