Add agent routing mode

[hchen2020]

No description provided.

[GGHansome]

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Code Review Summary

Change Overview: The changes introduce a new Mode property to the Agent class and its associated components. This property impacts the serialization, database representation, and related service methods, supporting routing modes such as "lazy" or "eager".

Identified Issues

Issue 1: Code Clarity

• Description: The introduction of the Mode property lacks clear validation logic to ensure that only valid strings like "lazy" or "eager" are set.
• Suggestion: Implement a validation method in SetAgentMode to enforce valid mode values.
• Example:

  public Agent SetAgentMode(string mode)
  {
      if (mode != "lazy" && mode != "eager") {
          throw new ArgumentException("Invalid mode");
      }
      Mode = mode;
      return this;
  }

Issue 2: Default Initialization

• Description: The Mode default initialization is directly in the property initializer. This might not handle backward compatibility if older data in the database doesn't have this field.
• Suggestion: Consider using a constructor to set default values for new instances while ensuring backward compatibility.
• Example:

  public Agent() {
      Mode = "eager";
  }

Issue 3: Hardcoded Strings

• Description: The string values for modes ("lazy", "eager") are hardcoded and appear multiple times.
• Suggestion: Define constants for these values to avoid typos and improve maintainability.
• Example:

  public const string ModeLazy = "lazy";
  public const string ModeEager = "eager";

Overall Evaluation

The code modifications generally enhance the Agent capabilities by adding the Mode attribute. However, refining validation logic, improving initialization practices, and utilizing constants for hard-coded strings will increase robustness, maintainability, and readability of the code. The addition appears to be properly integrated across various components, ensuring consistency with the existing system architecture.