private static void ConsumerMethod()
{
// Consumer method takes data from the blocking collection and writes it to a SQLite Database
DataRecord data;
SQLiteCommand cmd = conn.CreateCommand();
// Using transactions dramatically speeds up writing to SQLite
SQLiteTransaction tr = conn.BeginTransaction();
cmd.Transaction = tr;
while (true)
{
if (dataCollection.TryTake(out data))
{
SQLite_Methods.InsertResultItem(cmd, data, TABLE_NAME);
recordsWritten++;
}
else
{
Thread.Sleep(1);
}
if (recordsWritten % RECORDS_PER_TRANSACTION == 0)
{
tr.Commit();
tr = conn.BeginTransaction();
cmd.Transaction = tr;
}
if (recordsWritten == TOTAL_RECORDS)
{
tr.Commit();
tr.Dispose();
cmd.Dispose();
break;
}
}
}
static void Main(string[] args)
{
// Start preparation for the test
conn = SQLite_Methods.CreateConnection("test.db");
SQLite_Methods.CreateTableIfNotExists(conn, TABLE_NAME);
// End preparation for the test
// Make delegates for threads to call
ThreadStart tProd = new ThreadStart(ProducerMethod);
ThreadStart tCons = new ThreadStart(ConsumerMethod);
Thread producerThread = new Thread(tProd);
Thread producerThread2 = new Thread(tProd);
Thread producerThread3 = new Thread(tProd);
Thread producerThread4 = new Thread(tProd);
Thread consumerThread = new Thread(tCons);
// Timing C# is affected by the garbage collector. These calls negate that.
GC.Collect();
GC.WaitForPendingFinalizers();
// Timing C# is affected by the processor switching between other processes on the systems.
// This call negates that.
TimeSpan startingTime;
TimeSpan duration;
startingTime = Process.GetCurrentProcess().Threads[0].UserProcessorTime;
// DEMONSTRATE DIFFERENCE BETWEEN ONE AND FOUR PRODUCER THREADS BY COMMENTING OR UNCOMMENTING THE
// producerThread2.Start(), producerThread3.Start(), and producerThread4.Start() LINES.
producerThread.Start();
producerThread2.Start();
producerThread3.Start();
producerThread4.Start();
// ONLY ONE CONSUMER THREAD AT A TIME
consumerThread.Start();
while (true)
{
if (producerThread.ThreadState == System.Threading.ThreadState.Stopped && consumerThread.ThreadState == System.Threading.ThreadState.Stopped)
{
duration = Process.GetCurrentProcess().Threads[0].UserProcessorTime.Subtract(startingTime);
Console.WriteLine($"Time taken for writing {TOTAL_RECORDS} to SQLite = {duration.TotalMinutes} minutes");
break;
}
}
}
