/// <summary>
/// Retrieves the next message for writing from the queue.
/// </summary>
/// <param name="length"></param>
/// <returns></returns>
public byte[] TakePendingWrite(out int length)
{
BlockingQueue <PendingMethodCall> pendingWrites = _pendingWrites;
if (pendingWrites == null)
{
throw new OperationCanceledException(_endPointName);
}
PendingMethodCall message = pendingWrites.Dequeue();
PendingMethodsEventSource.Instance.Dequeued(_endPointName, message.RpcId);
PendingMethodsEventSource.Instance.QueueCountChanged(_endPointName, pendingWrites.Count);
return(message.GetMessage(out length));
}
/// <summary>
/// Shall be called once a pending call has been completely handled.
/// </summary>
/// <param name="methodCall"></param>
public void Recycle(PendingMethodCall methodCall)
{
lock (_syncRoot)
{
var id = methodCall.RpcId;
if (Log.IsDebugEnabled)
{
Log.DebugFormat("Removing method call '#{0}'...", id);
}
_pendingCalls.Remove(id);
if (Log.IsDebugEnabled)
{
Log.DebugFormat("Method call '#{0}' removed", id);
}
// We do not want to recycle thousands of messages because that can require
// lots of memory ("big" messages may take 1Mb of memory or even more).
// Therefore we limit the amount to a constant value (for now).
// In the future, we might want to limit the amount of used memory instead?
if (_recycledMessages.Count < MaxNumRecycledCalls)
{
Log.Debug("Recycling method call object...");
_recycledMessages.Enqueue(methodCall);
if (Log.IsDebugEnabled)
{
Log.DebugFormat("Method call object recycled, {0} objects available for re-use", _recycledMessages.Count);
}
}
else
{
Log.DebugFormat("Method call object won't be recycled: We're keeping enough alive already!");
}
}
}
