/// <summary>
/// Process all the ChunkOperations currently in the queue.
/// Everything is asynchronous and should load (at best) by grouping everything into lists before saving/loading.
/// This also handles chunk unloading when it is no longer needed by ChunkOperations AND ChunkLoaders.
/// <a href="http://www.stevevermeulen.com/index.php/2017/09/using-async-await-in-unity3d-2017/">
/// See for more info on async + Unity.
/// </a>
/// </summary>
private async Task ProcessOperations()
{
isProcessingOperations = true;
List <Vector3Int> chunksUsed = new List <Vector3Int>();
// If there are any elements in the queue of operations
while (chunkOperations.Any())
{
// Get the first operation and execute it
IChunkOperation operation = chunkOperations.Dequeue();
// Execute the task, and wait for it to return
await operation.Execute(this);
// Keep track of all the chunks that were used by the operations
chunksUsed = chunksUsed.Union(operation.ChunkPositions).ToList();
}
if (chunksUsed.Count > 0)
{
// Unload all chunks that were used and are no longer needed
await UnloadChunks(GetChunksToUnloadFromPositions(chunksUsed), worldInfo);
}
isProcessingOperations = false;
}
/// <summary>
/// Add the given operation to the ChunkOperations Queue.
/// </summary>
/// <param name="operation">The operation to add</param>
/// <returns>Returns the ExecuteTask to await for</returns>
private Task AddChunkOperation(IChunkOperation operation)
{
chunkOperations.Enqueue(operation);
// Return the task so the original caller can await it
// see implementation in the corresponding IChunkOperation's Execute() method.
return(operation.ExecuteCompletionSource.Task);
}