/// <summary>
/// Adds value to hash tree
/// </summary>
/// <typeparam name="TKey"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="destination"></param>
/// <param name="key">key to add</param>
/// <param name="value">value being added</param>
/// <param name="updateIfExists">if true update, if false just leave existing</param>
/// <returns>final value for key</returns>
public static TValue ThreadSafeAdd <TKey, TValue>(ref ImmutableHashTree <TKey, TValue> destination, TKey key, TValue value, bool updateIfExists = false)
{
var returnValue = value;
ThreadSafeAdd(ref destination, key, value, (currentValue, newValue) =>
{
if (updateIfExists)
{
return(newValue);
}
returnValue = currentValue;
return(currentValue);
});
return(returnValue);
}
private static void SpinWaitThreadSafeAddS <TKey, TValue>(ref ImmutableHashTree <TKey, TValue> destination, TKey key, TValue value,
ImmutableHashTree <TKey, TValue> .UpdateDelegate updateDelegate)
{
ImmutableHashTree <TKey, TValue> currentValue;
var wait = new SpinWait();
while (true)
{
wait.SpinOnce();
currentValue = destination;
if (ReferenceEquals(currentValue,
Interlocked.CompareExchange(ref destination,
currentValue.Add(key, value, updateDelegate),
currentValue)))
{
break;
}
}
}
/// <summary>
/// Add to tree in a thread safe manner
/// </summary>
/// <typeparam name="TKey">key type</typeparam>
/// <typeparam name="TValue">value type</typeparam>
/// <param name="destination">hash tree to add to</param>
/// <param name="key">key</param>
/// <param name="value">value</param>
/// <param name="updateDelegate">update delegate</param>
public static void ThreadSafeAdd <TKey, TValue>(ref ImmutableHashTree <TKey, TValue> destination, TKey key, TValue value, ImmutableHashTree <TKey, TValue> .UpdateDelegate updateDelegate)
{
if (destination == null)
{
throw new ArgumentNullException(nameof(destination));
}
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
var currentValue = destination;
if (ReferenceEquals(currentValue,
Interlocked.CompareExchange(ref destination,
currentValue.Add(key, value, updateDelegate),
currentValue)))
{
return;
}
SpinWaitThreadSafeAddS(ref destination, key, value, updateDelegate);
}