Can you provide an example of using IErrorReporter in a real-world application

Overview of the Application

The application is designed to process documents by extracting words and storing them in a database. It includes features like retrying failed operations and logging errors using an `IErrorReporter`.

Components of the Application

1. Document Processing Service: This service is responsible for extracting words from documents and storing them in a database. It uses an `IDocumentWithExtractedWordsStore` interface to abstract the storage mechanism.

2. Error Handling Mechanism: To handle errors during document processing, an `IErrorReporter` interface is used. This allows for flexible error reporting mechanisms, such as logging to an event log or sending notifications.

3. Retry Mechanism: A retry mechanism is implemented using a decorator pattern. If a document storage operation fails, it is retried a specified number of times before reporting the error.

Implementation Details

IErrorReporter Interface

csharp
public interface IErrorReporter
{
    void ReportError(string message, Exception exception);
}

ErrorAwareDocumentWithExtractedWordsStore Class

This class implements the `IDocumentWithExtractedWordsStore` interface and uses an `IErrorReporter` to report errors.

csharp
public class ErrorAwareDocumentWithExtractedWordsStore : IDocumentWithExtractedWordsStore
{
    private readonly IDocumentWithExtractedWordsStore _store;
    private readonly IErrorReporter _errorReporter;

    public ErrorAwareDocumentWithExtractedWordsStore(IDocumentWithExtractedWordsStore store, IErrorReporter errorReporter)
    {
        _store = store;
        _errorReporter = errorReporter;
    }

    public void StoreDocument(Document document)
    {
        try
        {
            _store.StoreDocument(document);
        }
        catch (Exception ex)
        {
            _errorReporter.ReportError("Failed to store document", ex);
            throw; // Re-throw to allow further handling if needed
        }
    }
}

EventLogErrorReporter Class

This class implements the `IErrorReporter` interface by logging errors to an event log.

csharp
public class EventLogErrorReporter : IErrorReporter
{
    public void ReportError(string message, Exception exception)
    {
        // Create an event log source if it doesn't exist
        if (!EventLog.SourceExists("DocumentIndexer"))
        {
            EventLog.CreateEventSource("DocumentIndexer", "Application");
        }

        // Log the error
        EventLog.WriteEntry("DocumentIndexer", $"{message}: {exception.Message}", EventLogEntryType.Error);
    }
}

Usage Example

To use these components in a real-world application, you would compose them as follows:

csharp
// Create an instance of the document store
var documentStore = new DatabaseDocumentStore();

// Create an error reporter
var errorReporter = new EventLogErrorReporter();

// Create an error-aware document store
var errorAwareStore = new ErrorAwareDocumentWithExtractedWordsStore(documentStore, errorReporter);

// Use the error-aware store to process documents
var documentProcessor = new DocumentProcessor(errorAwareStore);
documentProcessor.ProcessDocuments();

In this example, any errors that occur during document processing will be logged to the event log using the `EventLogErrorReporter`. This demonstrates how the `IErrorReporter` interface can be used to decouple error reporting from the core logic of the application, allowing for different reporting mechanisms to be easily swapped in or out.