public QualityMessage GetValue(SolutionMessage message, Evaluator evaluate, ExtensionRegistry extensions) {
var entry = new CacheEntry(message.ToString());
bool lockTaken = false;
bool waited = false;
try {
Monitor.Enter(cacheLock, ref lockTaken);
while (true) {
LinkedListNode<CacheEntry> node;
if (index.TryGetValue(entry, out node)) {
list.Remove(node);
list.AddLast(node);
Hits++;
lockTaken = false;
Monitor.Exit(cacheLock);
OnChanged();
return node.Value.GetMessage(extensions);
} else {
if (!waited && activeEvaluations.Contains(entry.Key)) {
while (activeEvaluations.Contains(entry.Key))
Monitor.Wait(cacheLock);
waited = true;
} else {
activeEvaluations.Add(entry.Key);
lockTaken = false;
Monitor.Exit(cacheLock);
OnChanged();
try {
entry.SetMessage(evaluate(message));
Monitor.Enter(cacheLock, ref lockTaken);
index[entry] = list.AddLast(entry);
Trim();
} finally {
if (!lockTaken)
Monitor.Enter(cacheLock, ref lockTaken);
activeEvaluations.Remove(entry.Key);
Monitor.PulseAll(cacheLock);
lockTaken = false;
Monitor.Exit(cacheLock);
}
OnChanged();
return entry.GetMessage(extensions);
}
}
}
} finally {
if (lockTaken)
Monitor.Exit(cacheLock);
}
}
public QualityMessage GetValue(SolutionMessage message, Evaluator evaluate, ExtensionRegistry extensions)
{
var entry = new CacheEntry(message.ToString());
bool lockTaken = false;
bool waited = false;
try {
Monitor.Enter(cacheLock, ref lockTaken);
while (true)
{
LinkedListNode <CacheEntry> node;
if (index.TryGetValue(entry, out node))
{
list.Remove(node);
list.AddLast(node);
Hits++;
lockTaken = false;
Monitor.Exit(cacheLock);
OnChanged();
return(node.Value.GetMessage(extensions));
}
else
{
if (!waited && activeEvaluations.Contains(entry.Key))
{
while (activeEvaluations.Contains(entry.Key))
{
Monitor.Wait(cacheLock);
}
waited = true;
}
else
{
activeEvaluations.Add(entry.Key);
lockTaken = false;
Monitor.Exit(cacheLock);
OnChanged();
try {
entry.SetMessage(evaluate(message));
Monitor.Enter(cacheLock, ref lockTaken);
index[entry] = list.AddLast(entry);
Trim();
} finally {
if (!lockTaken)
{
Monitor.Enter(cacheLock, ref lockTaken);
}
activeEvaluations.Remove(entry.Key);
Monitor.PulseAll(cacheLock);
lockTaken = false;
Monitor.Exit(cacheLock);
}
OnChanged();
return(entry.GetMessage(extensions));
}
}
}
} finally {
if (lockTaken)
{
Monitor.Exit(cacheLock);
}
}
}
