/// <summary>
/// Gets the collection of all updates to the stream.
/// </summary>
/// <returns>A collection of updates to the stream. If the boolean value is true then the update is an upsert operation, otherwise it's a delete operation.</returns>
public IEnumerable <(bool, dynamic, DateTime)> GetUncommittedUpdates()
{
List <(bool, dynamic, DateTime)> updates = new List <(bool, dynamic, DateTime)>();
foreach (DateTime originatingTime in this.updateList.Keys)
{
StreamUpdateWithView <T> update = this.updateList[originatingTime];
updates.Add((update.UpdateType != StreamUpdateType.Delete, update.Message.Data, originatingTime));
}
this.updateList.Clear();
return(updates);
}
/// <summary>
/// Called when the simple reader has read a new message from the store.
/// </summary>
/// <param name="data">The data in the message that was read.</param>
/// <param name="env">The envelope of the message that was read.</param>
private void OnReceiveData(T data, Envelope env)
{
if (!this.IsStopped)
{
// If the update list contains an item with the same originating
// time, then use that instead of the data coming from the store.
if (this.updateList.Any() && this.updateList.ContainsKey(env.OriginatingTime))
{
// Get the update object
StreamUpdateWithView <T> update = this.updateList[env.OriginatingTime];
// If the update was an Add, add its message to the data buffer instead
// of the one read from the store. If the update was a delete, then
// don't add anything to the data buffer.
switch (update.UpdateType)
{
case StreamUpdateType.Add:
lock (this.dataLock)
{
this.dataBuffer.Add(update.Message);
}
break;
case StreamUpdateType.Delete:
// The item was deleted, so do nothing.
break;
default:
throw new InvalidOperationException("The update type is not supported.");
}
}
else
{
// the data is obtained from an IStreamReader, and we therefore need to clone it
// to hold on to it past the lifetime of the OnReceiveData method.
var message = new Message <T>(data.DeepClone(), env.OriginatingTime, env.CreationTime, env.SourceId, env.SequenceId);
lock (this.dataLock)
{
this.dataBuffer.Add(message);
}
}
}
}
/// <summary>
/// Called when the simple reader has read a new message from the store.
/// </summary>
/// <param name="data">The data in the message that was read.</param>
/// <param name="env">The envelope of the message that was read.</param>
private void OnReceiveData(T data, Envelope env)
{
if (!this.IsCanceled)
{
lock (this.bufferLock)
{
// If the update list contains an item with the same originating
// time, then use that instead of the data coming from the store.
if (this.updateList.ContainsKey(env.OriginatingTime))
{
// Get the update object
StreamUpdateWithView <T> update = this.updateList[env.OriginatingTime];
// If the update was an Add, add its message to the data buffer instead
// of the one read from the store. If the update was a Deletem then
// don't add anything to the data buffer.
switch (update.UpdateType)
{
case StreamUpdateType.Add:
this.dataBuffer.Add(update.Message);
break;
case StreamUpdateType.Delete:
// The item was deleted, so do nothing.
break;
default:
throw new InvalidOperationException("The update type is not supported.");
}
}
else
{
this.dataBuffer.Add(new Message <T>(data, env.OriginatingTime, env.CreationTime, env.SourceId, env.SequenceId));
}
}
}
}
