using D365MetadataService.Models;
using Serilog;
using System;
using System.Threading.Tasks;
namespace D365MetadataService.Handlers
{
/// <summary>
/// Base class for request handlers providing common functionality
/// </summary>
public abstract class BaseRequestHandler : IRequestHandler
{
protected readonly ILogger Logger;
protected BaseRequestHandler(ILogger logger)
{
Logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
/// <summary>
/// The action type this handler supports
/// </summary>
public abstract string SupportedAction { get; }
/// <summary>
/// Handle the service request with automatic error handling and logging
/// </summary>
public async Task<ServiceResponse> HandleAsync(ServiceRequest request)
{
var startTime = DateTime.UtcNow;
Logger.Information("Handling {Action} request for {ObjectType}", SupportedAction, request.ObjectType);
try
{
var response = await HandleRequestAsync(request);
var duration = DateTime.UtcNow - startTime;
Logger.Information("Successfully handled {Action} request in {Duration}ms",
SupportedAction, duration.TotalMilliseconds);
return response;
}
catch (Exception ex)
{
var duration = DateTime.UtcNow - startTime;
Logger.Error(ex, "Error handling {Action} request after {Duration}ms",
SupportedAction, duration.TotalMilliseconds);
return ServiceResponse.CreateError($"{SupportedAction} operation failed: {ex.Message}");
}
}
/// <summary>
/// Implement this method to handle the specific request type
/// </summary>
protected abstract Task<ServiceResponse> HandleRequestAsync(ServiceRequest request);
/// <summary>
/// Validate common request parameters
/// </summary>
protected virtual ServiceResponse ValidateRequest(ServiceRequest request)
{
if (request == null)
{
return ServiceResponse.CreateError("Request cannot be null");
}
if (string.IsNullOrEmpty(request.Action))
{
return ServiceResponse.CreateError("Request action is required");
}
if (!string.Equals(request.Action, SupportedAction, StringComparison.OrdinalIgnoreCase))
{
return ServiceResponse.CreateError($"Handler {GetType().Name} does not support action: {request.Action}");
}
return null; // No validation error
}
}
}
