Audit sequence identity scaling and lifecycle

internal/engine/imports.go

@@ -812,11 +812,11 @@ func (s *importTraversal) composePendingItems(scope *acquisitionScope, policy se
 func acquiredSequenceDeclarations(scope acquisitionScope) []sequenceDeclarationSpec {
 	var declarations []sequenceDeclarationSpec
 	for _, contribution := range scope.contributions {
-		for _, declaration := range contribution.sequenceDeclarations {
-			projected := cloneSequenceDeclarations([]sequenceDeclarationSpec{declaration})[0]
-			projected.destination = appendDestination(contribution.relativeDestination, declaration.destination)
-			declarations = append(declarations, projected)
+		projected := cloneSequenceDeclarations(contribution.sequenceDeclarations)
+		for index := range projected {
+			projected[index].destination = appendDestination(contribution.relativeDestination, projected[index].destination)
 		}
+		declarations = append(declarations, projected...)
 	}
 	return declarations
 }

internal/engine/sequence_combine_bench_test.go

@@ -0,0 +1,42 @@
+package engine
+
+import (
+	"strconv"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/ConfigKit/internal/document"
+)
+
+func BenchmarkSequenceMixedUpsert(b *testing.B) {
+	for _, size := range []int{128, 512, 2048} {
+		b.Run(strconv.Itoa(size), func(b *testing.B) {
+			lower := benchmarkSequenceRecords(0, size, "lower")
+			higher := benchmarkSequenceRecords(size/2, size, "higher")
+			context := sequenceCombinationContext{destination: Keys("items")}
+			identityFields := []string{"id"}
+			b.ReportAllocs()
+			b.ResetTimer()
+			for range b.N {
+				if _, diagnostics := combineIdentifiedSequences(
+					lower, higher, sequenceModeUpsert, identityFields, context,
+				); len(diagnostics) != 0 {
+					b.Fatal(diagnostics)
+				}
+			}
+		})
+	}
+}
+
+func benchmarkSequenceRecords(start, count int, value string) *document.Node {
+	items := make([]*document.Node, count)
+	for index := range count {
+		items[index] = &document.Node{
+			Kind: document.Mapping,
+			Mapping: []document.Entry{
+				{Key: "id", Value: &document.Node{Kind: document.String, Text: "item-" + strconv.Itoa(start+index)}},
+				{Key: "value", Value: &document.Node{Kind: document.String, Text: value}},
+			},
+		}
+	}
+	return &document.Node{Kind: document.Sequence, Sequence: items}
+}