Performance improved.

src/Squidex.Infrastructure.MongoDb/EventStore/MongoEventStore.cs

@@ -15,10 +15,9 @@ using MongoDB.Bson;
 using MongoDB.Driver;
 using Squidex.Infrastructure.CQRS.Events;
 
-// ReSharper disable ConvertIfStatementToConditionalTernaryExpression
-// ReSharper disable ClassNeverInstantiated.Local
-// ReSharper disable UnusedMember.Local
 // ReSharper disable InvertIf
+// ReSharper disable ConvertIfStatementToConditionalTernaryExpression
+// ReSharper disable TooWideLocalVariableScope
 
 namespace Squidex.Infrastructure.MongoDb.EventStore
 {
@@ -48,7 +47,7 @@ namespace Squidex.Infrastructure.MongoDb.EventStore
 
         protected override async Task SetupCollectionAsync(IMongoCollection<MongoEventCommit> collection)
         {
-            await collection.Indexes.CreateOneAsync(Index.Ascending(x => x.EventStream).Ascending(x => x.Timestamp));
+            await collection.Indexes.CreateOneAsync(Index.Ascending(x => x.Timestamp).Ascending(x => x.EventStream));
             await collection.Indexes.CreateOneAsync(Index.Ascending(x => x.EventStreamOffset).Ascending(x => x.EventStream), new CreateIndexOptions { Unique = true });
         }
 
@@ -70,20 +69,36 @@ namespace Squidex.Infrastructure.MongoDb.EventStore
             Guard.NotNull(callback, nameof(callback));
 
             var tokenTimestamp = EmptyTimestamp;
-            var tokenEventStreamNumber = -1;
+            var tokenCommitSize = -1;
+            var tokenCommitOffset = -1;
+            var isEndOfCommit = false;
 
             if (position != null)
             {
                 var token = ParsePosition(position);
 
                 tokenTimestamp = token.Timestamp;
-                tokenEventStreamNumber = token.EventStreamNumber;
+                tokenCommitSize = token.CommitSize;
+                tokenCommitOffset = token.CommitOffset;
+
+                isEndOfCommit = tokenCommitOffset == tokenCommitSize - 1;
+
+                if (isEndOfCommit)
+                {
+                    tokenCommitOffset = -1;
+                }
+            }
+
+            var filters = new List<FilterDefinition<MongoEventCommit>>();
+
+            if (isEndOfCommit)
+            {
+                filters.Add(Filter.Gt(x => x.Timestamp, tokenTimestamp));
             }
-            
-            var filters = new List<FilterDefinition<MongoEventCommit>>
+            else
             {
-                Filter.Gte(x => x.Timestamp, tokenTimestamp)
-            };
+                filters.Add(Filter.Gte(x => x.Timestamp, tokenTimestamp));
+            }
 
             if (!string.IsNullOrWhiteSpace(streamFilter) && !string.Equals(streamFilter, "*", StringComparison.OrdinalIgnoreCase))
             {
@@ -110,20 +125,22 @@ namespace Squidex.Infrastructure.MongoDb.EventStore
 
             await Collection.Find(filter).SortBy(x => x.Timestamp).ForEachAsync(async commit =>
             {
-                var isGreaterTimestamp = commit.Timestamp > tokenTimestamp;
-
                 var eventStreamNumber = (int)commit.EventStreamOffset;
 
+                var commitOffset = 0;
+
                 foreach (var e in commit.Events)
                 {
                     eventStreamNumber++;
 
-                    if (isGreaterTimestamp || eventStreamNumber > tokenEventStreamNumber)
+                    if (commitOffset > tokenCommitOffset)
                     {
                         var eventData = new EventData { EventId = e.EventId, Metadata = e.Metadata, Payload = e.Payload, Type = e.Type };
-                        var eventToken = CreateToken(commit.Timestamp, eventStreamNumber);
+                        var eventToken = CreateToken(commit.Timestamp, commitOffset, commit.Events.Length);
 
                         await callback(new StoredEvent(eventToken, eventStreamNumber, eventData));
+
+                        commitOffset++;
                     }
                     else
                     {
@@ -201,18 +218,18 @@ namespace Squidex.Infrastructure.MongoDb.EventStore
             return -1;
         }
 
-        private static string CreateToken(BsonTimestamp timestamp, int eventStreamNumber)
+        private static string CreateToken(BsonTimestamp timestamp, int commitOffset, int commitSize)
         {
-            var parts = new object[] { timestamp.Timestamp, timestamp.Increment, eventStreamNumber };
+            var parts = new object[] { timestamp.Timestamp, timestamp.Increment, commitOffset, commitSize };
 
             return string.Join("-", parts);
         }
 
-        private static (BsonTimestamp Timestamp, int EventStreamNumber) ParsePosition(string position)
+        private static (BsonTimestamp Timestamp, int CommitOffset, int CommitSize) ParsePosition(string position)
         {
             var parts = position.Split('-');
 
-            return (new BsonTimestamp(int.Parse(parts[0]), int.Parse(parts[1])), int.Parse(parts[2]));
+            return (new BsonTimestamp(int.Parse(parts[0]), int.Parse(parts[1])), int.Parse(parts[2]), int.Parse(parts[3]));
         }
     }
 }

tests/Benchmarks/Program.cs

@@ -25,7 +25,7 @@ namespace Benchmarks
 
         public static void Main(string[] args)
         {
-            var id = args.Length > 0 ? args[0] : "handleEvents";
+            var id = args.Length > 0 ? args[0] : string.Empty;
 
             var benchmark = Benchmarks.Find(x => x.Id == id);
 

tests/Benchmarks/Tests/HandleEvents.cs

@@ -9,6 +9,7 @@
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using MongoDB.Bson;
 using MongoDB.Driver;
 using Newtonsoft.Json;
 using Squidex.Infrastructure;
@@ -82,7 +83,7 @@ namespace Benchmarks.Tests
         private readonly TypeNameRegistry typeNameRegistry = new TypeNameRegistry().Map(typeof(MyEvent));
         private readonly EventDataFormatter formatter;
         private readonly JsonSerializerSettings serializerSettings = new JsonSerializerSettings();
-        private const int NumEvents = 1000;
+        private const int NumEvents = 5000;
         private IMongoClient mongoClient;
         private IMongoDatabase mongoDatabase;
         private IEventStore eventStore;
@@ -143,7 +144,7 @@ namespace Benchmarks.Tests
 
             if (eventConsumer.EventNumbers.Count != NumEvents)
             {
-                throw new InvalidOperationException($"Only {eventConsumer.EventNumbers.Count} have been handled");
+                throw new InvalidOperationException($"{eventConsumer.EventNumbers.Count} Events have been handled");
             }
 
             for (var i = 0; i < eventConsumer.EventNumbers.Count; i++)