[GitHub] [nifi-minifi-cpp] adamdebreceni commented on a diff in pull request #1447: MINIFICPP-1976 - Do not store a whole Relationship object for each transfer

[GitBox <gi...@apache.org>]

adamdebreceni commented on code in PR #1447:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1447#discussion_r1018835222


##########
libminifi/include/utils/ValueIdProvider.h:
##########
@@ -0,0 +1,61 @@
+/**
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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/licenseas/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.
+ */
+
+#pragma once
+
+#include <optional>
+#include <unordered_map>
+#include <vector>
+
+namespace org::apache::nifi::minifi::utils {
+
+template<typename T, typename IdType = size_t>
+class ValueIdProvider {
+ public:
+  using id_type = IdType;
+  static constexpr id_type INVALID_ID = static_cast<id_type>(-1);
+
+  [[nodiscard]]
+  id_type getId(const T& value) {
+    auto [it, inserted] = value_to_id_.insert({value, gsl::narrow<id_type>(values_.size())});

Review Comment:
   added



##########
libminifi/include/utils/ValueIdProvider.h:
##########
@@ -0,0 +1,61 @@
+/**
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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/licenseas/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.
+ */
+
+#pragma once
+
+#include <optional>
+#include <unordered_map>
+#include <vector>
+
+namespace org::apache::nifi::minifi::utils {
+
+template<typename T, typename IdType = size_t>
+class ValueIdProvider {
+ public:
+  using id_type = IdType;
+  static constexpr id_type INVALID_ID = static_cast<id_type>(-1);
+
+  [[nodiscard]]
+  id_type getId(const T& value) {
+    auto [it, inserted] = value_to_id_.insert({value, gsl::narrow<id_type>(values_.size())});
+    if (inserted) {
+      values_.push_back(value);
+    }
+    return it->second;
+  }
+
+  [[nodiscard]]
+  std::optional<T> getValue(id_type id) const {
+    const auto idx = gsl::narrow<size_t>(id);
+    if (idx < values_.size()) {
+      return values_.at(idx);

Review Comment:
   removed



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