1 files changed, 33 insertions, 0 deletions
diff --git a/searchlib/src/vespa/searchlib/predicate/document_features_store_saver.h b/searchlib/src/vespa/searchlib/predicate/document_features_store_saver.h
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index 00000000000..630ac3900f5
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+++ b/searchlib/src/vespa/searchlib/predicate/document_features_store_saver.h
@@ -0,0 +1,33 @@
+// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
+#pragma once
+
+#include "document_features_store.h"
+
+namespace search { class BufferWriter; }
+
+namespace search::predicate {
+
+/*
+ * Class used to save a DocumentFeaturesStore instance, streaming the
+ * serialized data via a BufferWriter.
+ */
+class DocumentFeaturesStoreSaver {
+    using RefsVector = DocumentFeaturesStore::RefsVector;
+    using FeaturesStore = DocumentFeaturesStore::FeaturesStore;
+    using RangesStore = DocumentFeaturesStore::RangesStore;
+    using WordStore = DocumentFeaturesStore::WordStore;
+
+    const RefsVector&     _refs;  // TODO: Use copy when saving in flush thread
+    const FeaturesStore&  _features;
+    const RangesStore&    _ranges;
+    const WordStore&      _word_store;
+    const uint32_t        _arity;
+
+public:
+    DocumentFeaturesStoreSaver(const DocumentFeaturesStore& store);
+    ~DocumentFeaturesStoreSaver();
+    void save(BufferWriter& writer) const;
+};
+
+}