public static void Attach(IDatabaseSystem system, ILogger logger, IEventTransformer transformer)
{
if (system == null)
{
throw new ArgumentNullException(nameof(system));
}
if (!(system is IEventHandler))
{
throw new ArgumentException("The database system is not handling events");
}
((IEventHandler)system).Consume(@event => {
try {
var entry = transformer?.Transform(@event);
if (entry == null)
{
throw new LogException("It was not possible to generate a log entry from an event");
}
if (logger.IsInterestedIn(entry.Level))
{
logger.LogAsync(entry).ConfigureAwait(false).GetAwaiter().GetResult();
}
} catch (LogException) {
throw;
} catch (Exception ex) {
throw new LogException("An error occurred while logging an event", ex);
}
});
}
public EventSubscriber(IEventStoreConnection connection, UserCredentials creds, string streamName,
IEventTransformer transformer)
{
this.connection = connection;
this.creds = creds;
StreamName = streamName;
this.transformer = transformer;
}
public BatchReader(IEventStoreConnection connection, IEventTransformer transformer, int batchSize)
{
this.connection = connection;
this.batchSize = batchSize;
eventTransformer = transformer;
}
public EventStoreReader(IEventStoreConnection connection, IEventTransformer transformer)
{
this.connection = connection;
eventTransformer = transformer;
batchReader = new BatchReader(connection, transformer, 10);
}
public EventStoreWriter(IEventStoreConnection connection, IEventTransformer transformer)
{
this.connection = connection;
this.transformer = transformer;
}
protected BatchReader GivenSut(IEventStoreConnection connection, IEventTransformer transformer)
{
return(new BatchReader(connection, transformer, batchSize));
}
