NHibernate and interceptors - measuring/monitoring SQL round-trip times

Question

In order to get early-warning of a slow or potentially slow areas, I\'d like to have an Interceptor for NHibernate that can act as a performance monitor, so that any databas

Answer 1

I had a similar problem. I wanted measure and log all queries that goes through NHibernate. What I did is I wrote a custom batching factory (in this case I work with oracle) but you can apply the same technique to any db:

1-) Implement batcher factory, (in this case I am extending existing factory)

public class OracleLoggingBatchingBatcherFactory : OracleDataClientBatchingBatcherFactory
{
    public override IBatcher CreateBatcher(ConnectionManager connectionManager, IInterceptor interceptor)
    {
        return new OracleLoggingBatchingBatcher(connectionManager, interceptor);
    }
}

2-) Implement the Batcher itself (in this case I am extending existing batcher). Make sure you inherit IBatcher again since we want our new methods to be called

public class OracleLoggingBatchingBatcher : OracleDataClientBatchingBatcher, IBatcher
{
      .... // here override ExecuteNonQuery, DoExecuteBatch and ExecuteReader. 
           //You can do all kind of intercepting, logging or measuring here
           //If they are not overrideable just implement them and use "new" keyword if necessary
           //since we inherit IBatcher explicitly it will work polymorphically.
           //Make sure you call base implementation too or re-implement the method from scratch
}

3-) Register the factory via NHibernate config:

    OracleLoggingBatchingBatcherFactory, MyAssembly