We can improve the implementation of CustomProvider using ConcurrentDictionary<TKey, TValue> to handle the synchronization:
public class CustomProvider
{
private readonly
ConcurrentDictionary<string, OperationResult> _cache =
new ConcurrentDictionary<string, OperationResult>();
public OperationResult RunOperationOrGetFromCache(
string operationId)
{
return _cache.GetOrAdd(operationId,
id => RunLongRunningOperation(id));
}
private OperationResult RunLongRunningOperation(
string operationId)
{
// Running real long-running operation
// ...
Console.WriteLine("Running long-running operation");
return OperationResult.Create(operationId);
}
}The code became much simpler. We just used the GetOrAdd method and it does exactly what we need; if there is an element in the dictionary, it just returns its value or runs a provided delegate, gets...