1 files changed, 146 insertions, 0 deletions
diff --git a/icing/index/term-indexing-handler.cc b/icing/index/term-indexing-handler.cc
new file mode 100644
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+++ b/icing/index/term-indexing-handler.cc
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+// Copyright (C) 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "icing/index/term-indexing-handler.h"
+
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "icing/text_classifier/lib3/utils/base/status.h"
+#include "icing/text_classifier/lib3/utils/base/statusor.h"
+#include "icing/absl_ports/canonical_errors.h"
+#include "icing/index/index.h"
+#include "icing/index/property-existence-indexing-handler.h"
+#include "icing/index/string-section-indexing-handler.h"
+#include "icing/legacy/core/icing-string-util.h"
+#include "icing/proto/logging.pb.h"
+#include "icing/store/document-id.h"
+#include "icing/transform/normalizer.h"
+#include "icing/util/clock.h"
+#include "icing/util/logging.h"
+#include "icing/util/status-macros.h"
+#include "icing/util/tokenized-document.h"
+
+namespace icing {
+namespace lib {
+
+/* static */ libtextclassifier3::StatusOr<std::unique_ptr<TermIndexingHandler>>
+TermIndexingHandler::Create(const Clock* clock, const Normalizer* normalizer,
+                            Index* index,
+                            bool build_property_existence_metadata_hits) {
+  ICING_RETURN_ERROR_IF_NULL(clock);
+  ICING_RETURN_ERROR_IF_NULL(normalizer);
+  ICING_RETURN_ERROR_IF_NULL(index);
+
+  // Property existence index handler
+  std::unique_ptr<PropertyExistenceIndexingHandler>
+      property_existence_indexing_handler = nullptr;
+  if (build_property_existence_metadata_hits) {
+    ICING_ASSIGN_OR_RETURN(
+        property_existence_indexing_handler,
+        PropertyExistenceIndexingHandler::Create(clock, index));
+  }
+  // String section index handler
+  ICING_ASSIGN_OR_RETURN(
+      std::unique_ptr<StringSectionIndexingHandler>
+          string_section_indexing_handler,
+      StringSectionIndexingHandler::Create(normalizer, index));
+
+  return std::unique_ptr<TermIndexingHandler>(new TermIndexingHandler(
+      clock, index, std::move(property_existence_indexing_handler),
+      std::move(string_section_indexing_handler)));
+}
+
+libtextclassifier3::Status TermIndexingHandler::Handle(
+    const TokenizedDocument& tokenized_document, DocumentId document_id,
+    bool recovery_mode, PutDocumentStatsProto* put_document_stats) {
+  std::unique_ptr<Timer> index_timer = clock_.GetNewTimer();
+
+  if (index_.last_added_document_id() != kInvalidDocumentId &&
+      document_id <= index_.last_added_document_id()) {
+    if (recovery_mode) {
+      // Skip the document if document_id <= last_added_document_id in recovery
+      // mode without returning an error.
+      return libtextclassifier3::Status::OK;
+    }
+    return absl_ports::InvalidArgumentError(IcingStringUtil::StringPrintf(
+        "DocumentId %d must be greater than last added document_id %d",
+        document_id, index_.last_added_document_id()));
+  }
+  index_.set_last_added_document_id(document_id);
+
+  libtextclassifier3::Status status = libtextclassifier3::Status::OK;
+  if (property_existence_indexing_handler_ != nullptr) {
+    status = property_existence_indexing_handler_->Handle(
+        tokenized_document, document_id, put_document_stats);
+  }
+  if (status.ok()) {
+    status = string_section_indexing_handler_->Handle(
+        tokenized_document, document_id, put_document_stats);
+  }
+
+  if (put_document_stats != nullptr) {
+    put_document_stats->set_term_index_latency_ms(
+        index_timer->GetElapsedMilliseconds());
+  }
+
+  // Check if we should merge when we're either successful or we've hit resource
+  // exhausted.
+  bool should_merge =
+      (status.ok() || absl_ports::IsResourceExhausted(status)) &&
+      index_.WantsMerge();
+
+  // Check and sort the LiteIndex HitBuffer if we don't need to merge.
+  if (!should_merge && index_.LiteIndexNeedSort()) {
+    std::unique_ptr<Timer> sort_timer = clock_.GetNewTimer();
+    index_.SortLiteIndex();
+
+    if (put_document_stats != nullptr) {
+      put_document_stats->set_lite_index_sort_latency_ms(
+          sort_timer->GetElapsedMilliseconds());
+    }
+  }
+
+  // Attempt index merge if needed.
+  if (should_merge) {
+    ICING_LOG(INFO) << "Merging the index at docid " << document_id << ".";
+
+    std::unique_ptr<Timer> merge_timer = clock_.GetNewTimer();
+    libtextclassifier3::Status merge_status = index_.Merge();
+
+    if (!merge_status.ok()) {
+      ICING_LOG(ERROR) << "Index merging failed. Clearing index.";
+      if (!index_.Reset().ok()) {
+        return absl_ports::InternalError(IcingStringUtil::StringPrintf(
+            "Unable to reset to clear index after merge failure. Merge "
+            "failure=%d:%s",
+            merge_status.error_code(), merge_status.error_message().c_str()));
+      } else {
+        return absl_ports::DataLossError(IcingStringUtil::StringPrintf(
+            "Forced to reset index after merge failure. Merge failure=%d:%s",
+            merge_status.error_code(), merge_status.error_message().c_str()));
+      }
+    }
+
+    if (put_document_stats != nullptr) {
+      put_document_stats->set_index_merge_latency_ms(
+          merge_timer->GetElapsedMilliseconds());
+    }
+  }
+  return status;
+}
+
+}  // namespace lib
+}  // namespace icing