private void ProcessPendingEntries()

in Sources/Core/Microsoft.StreamProcessing/Operators/EquiJoin/Basic/PartitionedEquiJoinPipe.cs [247:445]
175 lines of code
25 McCabe index (conditional complexity)

        private void ProcessPendingEntries()
        {
            foreach (var pKey in this.processQueue)
            {
                // Partition is no longer clean if we are processing it. If it is still clean, it will be added below.
                this.cleanKeys.Remove(pKey);

                Queue<LEntry> leftWorking = null;
                Queue<REntry> rightWorking = null;

                this.leftQueue.Lookup(pKey, out int index);
                leftWorking = this.leftQueue.entries[index].value;
                rightWorking = this.rightQueue.entries[index].value;
                this.partitionData.Lookup(pKey, out index);
                var partition = this.partitionData.entries[index].value;

                while (true)
                {
                    LEntry leftEntry;
                    REntry rightEntry;
                    var old = partition.currTime;
                    bool hasLeftBatch = leftWorking.Count != 0;
                    bool hasRightBatch = rightWorking.Count != 0;
                    if (hasLeftBatch && hasRightBatch)
                    {
                        leftEntry = leftWorking.Peek();
                        rightEntry = rightWorking.Peek();
                        UpdateNextLeftTime(partition, leftEntry.Sync);
                        UpdateNextRightTime(partition, rightEntry.Sync);

                        if (partition.nextLeftTime < partition.nextRightTime)
                        {
                            UpdateTime(partition, partition.nextLeftTime);

                            if (leftEntry.Other != long.MinValue)
                            {
                                ProcessLeftEvent(
                                    partition,
                                    partition.nextLeftTime,
                                    leftEntry.Other,
                                    ref leftEntry.Key,
                                    leftEntry.Payload,
                                    leftEntry.Hash);
                            }
                            else if (partition.currTime > old)
                            {
                                var r = default(TRight);
                                AddToBatch(
                                    partition.currTime,
                                    long.MinValue,
                                    ref leftEntry.Key,
                                    ref leftEntry.Payload,
                                    ref r,
                                    leftEntry.Hash);
                            }

                            leftWorking.Dequeue();
                        }
                        else
                        {
                            UpdateTime(partition, partition.nextRightTime);

                            if (rightEntry.Other != long.MinValue)
                            {
                                ProcessRightEvent(
                                    partition,
                                    partition.nextRightTime,
                                    rightEntry.Other,
                                    ref rightEntry.Key,
                                    rightEntry.Payload,
                                    rightEntry.Hash);
                            }
                            else if (partition.currTime > old)
                            {
                                var l = default(TLeft);
                                AddToBatch(
                                    partition.currTime,
                                    long.MinValue,
                                    ref rightEntry.Key,
                                    ref l,
                                    ref rightEntry.Payload,
                                    rightEntry.Hash);
                            }

                            rightWorking.Dequeue();
                        }
                    }
                    else if (hasLeftBatch)
                    {
                        leftEntry = leftWorking.Peek();
                        UpdateNextLeftTime(partition, leftEntry.Sync);
                        partition.nextRightTime = Math.Max(partition.nextRightTime, this.lastRightCTI);
                        if (partition.nextLeftTime > partition.nextRightTime)
                        {
                            // If we have not yet reached the lesser of the two sides (in this case, right), and we don't
                            // have input from that side, reach that time now. This can happen with low watermarks.
                            if (partition.currTime < partition.nextRightTime)
                                UpdateTime(partition, partition.nextRightTime);
                            break;
                        }

                        UpdateTime(partition, partition.nextLeftTime);

                        if (leftEntry.Other != long.MinValue)
                        {
                            ProcessLeftEvent(
                                partition,
                                partition.nextLeftTime,
                                leftEntry.Other,
                                ref leftEntry.Key,
                                leftEntry.Payload,
                                leftEntry.Hash);
                        }
                        else if (partition.currTime > old)
                        {
                            var r = default(TRight);
                            AddToBatch(
                                partition.currTime,
                                long.MinValue,
                                ref leftEntry.Key,
                                ref leftEntry.Payload,
                                ref r,
                                leftEntry.Hash);
                        }

                        leftWorking.Dequeue();
                    }
                    else if (hasRightBatch)
                    {
                        rightEntry = rightWorking.Peek();
                        UpdateNextRightTime(partition, rightEntry.Sync);
                        partition.nextLeftTime = Math.Max(partition.nextLeftTime, this.lastLeftCTI);
                        if (partition.nextLeftTime < partition.nextRightTime)
                        {
                            // If we have not yet reached the lesser of the two sides (in this case, left), and we don't
                            // have input from that side, reach that time now. This can happen with low watermarks.
                            if (partition.currTime < partition.nextLeftTime)
                                UpdateTime(partition, partition.nextLeftTime);
                            break;
                        }

                        UpdateTime(partition, partition.nextRightTime);

                        if (rightEntry.Other != long.MinValue)
                        {
                            ProcessRightEvent(
                                partition,
                                partition.nextRightTime,
                                rightEntry.Other,
                                ref rightEntry.Key,
                                rightEntry.Payload,
                                rightEntry.Hash);
                        }
                        else if (partition.currTime > old)
                        {
                            var l = default(TLeft);
                            AddToBatch(
                                partition.currTime,
                                long.MinValue,
                                ref rightEntry.Key,
                                ref l,
                                ref rightEntry.Payload,
                                rightEntry.Hash);
                        }

                        rightWorking.Dequeue();
                    }
                    else
                    {
                        if (partition.nextLeftTime < this.lastLeftCTI)
                            UpdateNextLeftTime(partition, this.lastLeftCTI);
                        if (partition.nextRightTime < this.lastRightCTI)
                            UpdateNextRightTime(partition, this.lastRightCTI);

                        UpdateTime(partition, Math.Min(this.lastLeftCTI, this.lastRightCTI));
                        if (partition.IsClean()) this.cleanKeys.Add(pKey);

                        break;
                    }
                }
            }

            if (this.emitCTI)
            {
                var earliest = Math.Min(this.lastLeftCTI, this.lastRightCTI);
                AddLowWatermarkToBatch(earliest);
                this.emitCTI = false;
                foreach (var p in this.cleanKeys)
                {
                    this.seenKeys.Remove(p);
                    this.leftQueue.Remove(p);
                    this.rightQueue.Remove(p);
                }

                this.cleanKeys.Clear();
            }

            this.processQueue.Clear();
        }