/// <summary>
/// Open file for reading and then read one line at a time calling the event processing delegate (function pointer) to
/// process the event
/// </summary>
/// <remarks>
/// Streaming events sequentially from a file is slightly faster than loading all events into an array before processing.
/// It also reduces the memory required when processing a large file.
/// </remarks>
/// <param name="fileName">Event file name</param>
/// <param name="eventProcessingFunction">Delegate (function pointer) for the method that will process the events</param>
internal void StreamFromFile(string fileName, ApiEventFeedReplay.EventReceivedHandler eventProcessingFunction)
{
StreamReader file = null;
try
{
file = new StreamReader(fileName);
string line;
do
{
line = file.ReadLine();
if (line != null)
{
Spark.Event eventItem = ApiEventReaderWriter.Parse(line);
eventProcessingFunction(eventItem);
}
} while (line != null);
}
finally
{
if (file != null)
{
file.Close(); //Close file stream even if there is an error
}
}
}
/// <summary>
/// Initiate event reader
/// </summary>
private void ExecuteEventReader()
{
ApiEventReaderWriter reader = new ApiEventReaderWriter();
reader.StreamFromFile(FileName, EventRecieved);
}
/// <summary>
/// Initiate data feed
/// </summary>
public override void Execute()
{
ApiEventReaderWriter reader = new ApiEventReaderWriter();
reader.StreamFromFile(FileName, EventRecieved);
}
