public IReadOnlyDictionary <char, int> GetCharCounts()
{
while (textLineQueue.Count > 0 || producerTasks.Count > 0)
{
emptyEvent.WaitOne();
}
return(totaliser.GetCharCounts());
}
public IReadOnlyDictionary <char, int> GetCharCounts()
{
// This will throw if someone adds a line to the totaliser while it's executing.
// We need to make it thread-safe and we want to allow multiple simultaneous reads.
//
// Try at least the following approaches: -
// - ReaderWriterLock
// - ReaderWriterLockSlim
return(totaliser.GetCharCounts());
}
public void Add_ShouldGiveCharCountsOfCharacters()
{
var totaliser = new CharacterTotaliser();
totaliser.Add("abca.");
totaliser.Add("foo bar wibble!");
var counts = totaliser.GetCharCounts();
Assert.That(counts['a'], Is.EqualTo(3));
Assert.That(counts['b'], Is.EqualTo(4));
}
public IReadOnlyDictionary <char, int> GetCharCounts()
{
readerWriterLock.EnterReadLock();
try
{
return(totaliser.GetCharCounts());
}
finally
{
readerWriterLock.ExitReadLock();
}
}
private IReadOnlyDictionary <char, int> ComputeCharCounts(IReadOnlyCollection <string> allLines)
{
using (SystemMode.Counter) // don't remove this - that's cheating!
{
var totaliser = new CharacterTotaliser();
foreach (string line in allLines)
{
totaliser.Add(line);
}
return(totaliser.GetCharCounts());
}
}
public IReadOnlyDictionary <char, int> GetCharCounts()
{
// This will return the result at the time of call, but processing might be in progress.
// How can we make it block until processing is complete?
return(totaliser.GetCharCounts());
}
