Closures are kept for children instead of global

src/Speckle.Sdk.Dependencies/Pools.cs

@@ -21,5 +21,31 @@ public bool Return(Dictionary<string, object?> obj)
   public static Pool<StringBuilder> StringBuilders { get; } =
     new(new StringBuilderPooledObjectPolicy() { MaximumRetainedCapacity = 100 * 1024 * 1024 });
 
-  public static Pool<List<T>> CreateListPool<T>() => new(new DefaultPooledObjectPolicy<List<T>>());
+  private sealed class ObjectDictionaryPolicy<TKey, TValue> : IPooledObjectPolicy<Dictionary<TKey, TValue>>
+    where TKey : notnull
+  {
+    public Dictionary<TKey, TValue> Create() => new(50);
+
+    public bool Return(Dictionary<TKey, TValue> obj)
+    {
+      obj.Clear();
+      return true;
+    }
+  }
+
+  private sealed class ObjectListPolicy<T> : IPooledObjectPolicy<List<T>>
+  {
+    public List<T> Create() => new(50);
+
+    public bool Return(List<T> obj)
+    {
+      obj.Clear();
+      return true;
+    }
+  }
+
+  public static Pool<List<T>> CreateListPool<T>() => new(new ObjectListPolicy<T>());
+
+  public static Pool<Dictionary<TKey, TValue>> CreateDictionaryPool<TKey, TValue>()
+    where TKey : notnull => new(new ObjectDictionaryPolicy<TKey, TValue>());
 }

src/Speckle.Sdk.Dependencies/Serialization/ChannelExtensions.cs

@@ -1,18 +1,18 @@
 using System.Threading.Channels;
 using Open.ChannelExtensions;
-using Speckle.Sdk.Dependencies.Serialization;
 
 namespace Speckle.Sdk.Serialisation.V2.Send;
 
 public static class ChannelExtensions
 {
-  public static BatchingChannelReader<BaseItem, List<BaseItem>> BatchBySize(
-    this ChannelReader<BaseItem> source,
+  public static BatchingChannelReader<T, List<T>> BatchBySize<T>(
+    this ChannelReader<T> source,
     int batchSize,
     bool singleReader = false,
     bool allowSynchronousContinuations = false
-  ) =>
-    new SizeBatchingChannelReader(
+  )
+    where T : IHasSize =>
+    new SizeBatchingChannelReader<T>(
       source ?? throw new ArgumentNullException(nameof(source)),
       batchSize,
       singleReader,

src/Speckle.Sdk.Dependencies/Serialization/ChannelLoader.cs

@@ -2,7 +2,7 @@
 
 namespace Speckle.Sdk.Dependencies.Serialization;
 
-public abstract class ChannelLoader
+public abstract class ChannelLoader<T>
 {
   private const int HTTP_GET_CHUNK_SIZE = 500;
   private const int MAX_PARALLELISM_HTTP = 4;
@@ -27,7 +27,7 @@ await allChildrenIds
 
   public abstract string? CheckCache(string id);
 
-  public abstract Task<List<BaseItem>> Download(List<string?> ids);
+  public abstract Task<List<T>> Download(List<string?> ids);
 
-  public abstract void SaveToCache(List<BaseItem> x);
+  public abstract void SaveToCache(List<T> x);
 }

src/Speckle.Sdk.Dependencies/Serialization/ChannelSaver.cs

@@ -1,27 +1,11 @@
-using System.Text;
 using System.Threading.Channels;
 using Open.ChannelExtensions;
 using Speckle.Sdk.Serialisation.V2.Send;
 
 namespace Speckle.Sdk.Dependencies.Serialization;
 
-public readonly record struct BaseItem(string Id, string Json, bool NeedsStorage)
-{
-  public int Size { get; } = Encoding.UTF8.GetByteCount(Json);
-
-  public bool Equals(BaseItem? other)
-  {
-    if (other is null)
-    {
-      return false;
-    }
-    return string.Equals(Id, other.Value.Id, StringComparison.OrdinalIgnoreCase);
-  }
-
-  public override int GetHashCode() => Id.GetHashCode();
-}
-
-public abstract class ChannelSaver
+public abstract class ChannelSaver<T>
+  where T : IHasSize
 {
   private const int SEND_CAPACITY = 50;
   private const int HTTP_SEND_CHUNK_SIZE = 25_000_000; //bytes
@@ -31,7 +15,9 @@ public abstract class ChannelSaver
   private const int MAX_CACHE_WRITE_PARALLELISM = 1;
   private const int MAX_CACHE_BATCH = 200;
 
-  private readonly Channel<BaseItem> _checkCacheChannel = Channel.CreateBounded<BaseItem>(
+  private bool _enabled;
+
+  private readonly Channel<T> _checkCacheChannel = Channel.CreateBounded<T>(
     new BoundedChannelOptions(SEND_CAPACITY)
     {
       AllowSynchronousContinuations = true,
@@ -43,35 +29,60 @@ public abstract class ChannelSaver
     _ => throw new NotImplementedException("Dropping items not supported.")
   );
 
-  public Task Start(CancellationToken cancellationToken = default)
+  public Task<long> Start(
+    bool enableServerSending = true,
+    bool enableCacheSaving = true,
+    CancellationToken cancellationToken = default
+  )
   {
-    var t = _checkCacheChannel
-      .Reader.BatchBySize(HTTP_SEND_CHUNK_SIZE)
-      .WithTimeout(HTTP_BATCH_TIMEOUT)
-      .PipeAsync(
-        MAX_PARALLELISM_HTTP,
-        async x => await SendToServer(x, cancellationToken).ConfigureAwait(false),
-        HTTP_CAPACITY,
-        false,
-        cancellationToken
-      )
-      .Join()
-      .Batch(MAX_CACHE_BATCH)
-      .WithTimeout(HTTP_BATCH_TIMEOUT)
-      .ReadAllConcurrently(MAX_CACHE_WRITE_PARALLELISM, SaveToCache, cancellationToken);
-    return t;
+    ValueTask<long> t = new(Task.FromResult(0L));
+    if (enableServerSending)
+    {
+      _enabled = true;
+      var tChannelReader = _checkCacheChannel
+        .Reader.BatchBySize(HTTP_SEND_CHUNK_SIZE)
+        .WithTimeout(HTTP_BATCH_TIMEOUT)
+        .PipeAsync(
+          MAX_PARALLELISM_HTTP,
+          async x => await SendToServer(x, cancellationToken).ConfigureAwait(false),
+          HTTP_CAPACITY,
+          false,
+          cancellationToken
+        );
+      if (enableCacheSaving)
+      {
+        t = new(
+          tChannelReader
+            .Join()
+            .Batch(MAX_CACHE_BATCH)
+            .WithTimeout(HTTP_BATCH_TIMEOUT)
+            .ReadAllConcurrently(MAX_CACHE_WRITE_PARALLELISM, SaveToCache, cancellationToken)
+        );
+      }
+      else
+      {
+        t = tChannelReader.ReadUntilCancelledAsync(cancellationToken, (list, l) => new ValueTask());
+      }
+    }
+
+    return t.AsTask();
   }
 
-  public async Task Save(BaseItem item, CancellationToken cancellationToken = default) =>
-    await _checkCacheChannel.Writer.WriteAsync(item, cancellationToken).ConfigureAwait(false);
+  public async ValueTask Save(T item, CancellationToken cancellationToken = default)
+  {
+    if (_enabled)
+    {
+      await _checkCacheChannel.Writer.WriteAsync(item, cancellationToken).ConfigureAwait(false);
+    }
+  }
 
-  public abstract Task<List<BaseItem>> SendToServer(List<BaseItem> batch, CancellationToken cancellationToken);
+  public abstract Task<List<T>> SendToServer(List<T> batch, CancellationToken cancellationToken);
 
-  public Task Done()
+  public ValueTask Done()
   {
     _checkCacheChannel.Writer.Complete();
-    return Task.CompletedTask;
+    return new(Task.CompletedTask);
   }
 
-  public abstract void SaveToCache(List<BaseItem> item);
+  public abstract void SaveToCache(List<T> item);
 }

src/Speckle.Sdk.Dependencies/Serialization/SizeBatchingChannelReader.cs

@@ -1,28 +1,33 @@
 using System.Threading.Channels;
 using Open.ChannelExtensions;
-using Speckle.Sdk.Dependencies.Serialization;
 
 namespace Speckle.Sdk.Serialisation.V2.Send;
 
-public class SizeBatchingChannelReader(
-  ChannelReader<BaseItem> source,
+public interface IHasSize
+{
+  int Size { get; }
+}
+
+public class SizeBatchingChannelReader<T>(
+  ChannelReader<T> source,
   int batchSize,
   bool singleReader,
   bool syncCont = false
-) : BatchingChannelReader<BaseItem, List<BaseItem>>(source, batchSize, singleReader, syncCont)
+) : BatchingChannelReader<T, List<T>>(source, batchSize, singleReader, syncCont)
+  where T : IHasSize
 {
   private readonly int _batchSize = batchSize;
 
-  protected override List<BaseItem> CreateBatch(int capacity) => new();
+  protected override List<T> CreateBatch(int capacity) => new();
 
-  protected override void TrimBatch(List<BaseItem> batch) => batch.TrimExcess();
+  protected override void TrimBatch(List<T> batch) => batch.TrimExcess();
 
-  protected override void AddBatchItem(List<BaseItem> batch, BaseItem item) => batch.Add(item);
+  protected override void AddBatchItem(List<T> batch, T item) => batch.Add(item);
 
-  protected override int GetBatchSize(List<BaseItem> batch)
+  protected override int GetBatchSize(List<T> batch)
   {
     int size = 0;
-    foreach (BaseItem item in batch)
+    foreach (T item in batch)
     {
       size += item.Size;
     }

src/Speckle.Sdk/Serialisation/V2/DummySendServerObjectManager.cs

@@ -1,5 +1,5 @@
 using System.Text;
-using Speckle.Sdk.Dependencies.Serialization;
+using Speckle.Sdk.Serialisation.V2.Send;
 using Speckle.Sdk.SQLite;
 using Speckle.Sdk.Transports;
 
@@ -23,7 +23,7 @@ public class DummySqLiteJsonCacheManager : ISqLiteJsonCacheManager
 public class DummySendServerObjectManager : IServerObjectManager
 {
   public IAsyncEnumerable<(string, string)> DownloadObjects(
-    IReadOnlyList<string> objectIds,
+    IReadOnlyCollection<string> objectIds,
     IProgress<ProgressArgs>? progress,
     CancellationToken cancellationToken
   ) => throw new NotImplementedException();
@@ -35,7 +35,7 @@ CancellationToken cancellationToken
   ) => throw new NotImplementedException();
 
   public Task<Dictionary<string, bool>> HasObjects(
-    IReadOnlyList<string> objectIds,
+    IReadOnlyCollection<string> objectIds,
     CancellationToken cancellationToken
   ) => throw new NotImplementedException();
 
@@ -49,7 +49,7 @@ CancellationToken cancellationToken
     long totalBytes = 0;
     foreach (var item in objects)
     {
-      totalBytes += Encoding.Default.GetByteCount(item.Json);
+      totalBytes += Encoding.Default.GetByteCount(item.Json.Value);
     }
 
     progress?.Report(new(ProgressEvent.UploadBytes, totalBytes, totalBytes));

src/Speckle.Sdk/Serialisation/V2/Receive/ObjectLoader.cs

@@ -3,6 +3,7 @@
 using Speckle.Sdk.Dependencies;
 using Speckle.Sdk.Dependencies.Serialization;
 using Speckle.Sdk.Serialisation.Utilities;
+using Speckle.Sdk.Serialisation.V2.Send;
 using Speckle.Sdk.SQLite;
 using Speckle.Sdk.Transports;
 
@@ -13,7 +14,7 @@ public sealed class ObjectLoader(
   ISqLiteJsonCacheManager sqLiteJsonCacheManager,
   IServerObjectManager serverObjectManager,
   IProgress<ProgressArgs>? progress
-) : ChannelLoader, IObjectLoader
+) : ChannelLoader<BaseItem>, IObjectLoader
 {
   private int? _allChildrenCount;
   private long _checkCache;
@@ -80,13 +81,13 @@ public override async Task<List<BaseItem>> Download(List<string?> ids)
       var (id, json) in serverObjectManager.DownloadObjects(ids.Select(x => x.NotNull()).ToList(), progress, default)
     )
     {
-      toCache.Add(new(id, json, true));
+      toCache.Add(new(new(id), new(json), true, null));
     }
 
     if (toCache.Count != ids.Count)
     {
       throw new SpeckleException(
-        $"Objects in batch missing: {string.Join(",", ids.Except(toCache.Select(y => y.Id)).Take(10))}"
+        $"Objects in batch missing: {string.Join(",", ids.Except(toCache.Select(y => y.Id.Value)).Take(10))}"
       );
     }
     return toCache;
@@ -97,7 +98,7 @@ public override void SaveToCache(List<BaseItem> batch)
   {
     if (!_options.SkipCache)
     {
-      sqLiteJsonCacheManager.SaveObjects(batch.Select(x => (x.Id, x.Json)));
+      sqLiteJsonCacheManager.SaveObjects(batch.Select(x => (x.Id.Value, x.Json.Value)));
       Interlocked.Exchange(ref _cached, _cached + batch.Count);
       progress?.Report(new(ProgressEvent.CachedToLocal, _cached, _allChildrenCount));
     }