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diff --git a/fcp/client/opstats/opstats_example_store.h b/fcp/client/opstats/opstats_example_store.h
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+/*
+ * Copyright 2021 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.
+ */
+#ifndef FCP_CLIENT_OPSTATS_OPSTATS_EXAMPLE_STORE_H_
+#define FCP_CLIENT_OPSTATS_OPSTATS_EXAMPLE_STORE_H_
+
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "fcp/client/engine/example_iterator_factory.h"
+#include "fcp/client/log_manager.h"
+#include "fcp/client/opstats/opstats_db.h"
+#include "fcp/client/opstats/opstats_logger.h"
+#include "fcp/client/simple_task_environment.h"
+#include "fcp/protos/plan.pb.h"
+
+namespace fcp {
+namespace client {
+namespace opstats {
+inline static constexpr char kOpStatsCollectionUri[] = "internal:/opstats";
+inline static constexpr char kPopulationName[] = "population_name";
+inline static constexpr char kSessionName[] = "session_name";
+inline static constexpr char kTaskName[] = "task_name";
+inline static constexpr char kEventsEventType[] = "events-event_type";
+inline static constexpr char kEventsTimestampMillis[] = "events-timestamp";
+inline static constexpr char kDatasetStatsUri[] = "dataset_stats-uri";
+inline static constexpr char kDatasetStatsNumExamplesRead[] =
+    "dataset_stats-num_examples_read";
+inline static constexpr char kDatasetStatsNumBytesRead[] =
+    "dataset_stats-num_bytes_read";
+inline static constexpr char kErrorMessage[] = "error_message";
+inline static constexpr char kRetryWindowDelayMinMillis[] =
+    "retry_window-delay_min";
+inline static constexpr char kRetryWindowDelayMaxMillis[] =
+    "retry_window-delay_max";
+inline static constexpr char kChunkingLayerBytesDownloaded[] =
+    "chunking_layer_bytes_downloaded";
+inline static constexpr char kChunkingLayerBytesUploaded[] =
+    "chunking_layer_bytes_uploaded";
+inline static constexpr char kNetworkDuration[] = "network_duration";
+inline static constexpr char kEarliestTrustWorthyTimeMillis[] =
+    "earliest_trustworthy_time";
+
+class OpStatsExampleIteratorFactory
+    : public fcp::client::engine::ExampleIteratorFactory {
+ public:
+  OpStatsExampleIteratorFactory(
+      OpStatsLogger* op_stats_logger, LogManager* log_manager,
+      bool opstats_last_successful_contribution_criteria)
+      : op_stats_logger_(op_stats_logger),
+        log_manager_(log_manager),
+        opstats_last_successful_contribution_criteria_(
+            opstats_last_successful_contribution_criteria) {}
+
+  bool CanHandle(const google::internal::federated::plan::ExampleSelector&
+                     example_selector) override;
+
+  bool ShouldCollectStats() override { return true; }
+
+  absl::StatusOr<std::unique_ptr<ExampleIterator>> CreateExampleIterator(
+      const google::internal::federated::plan::ExampleSelector&
+          example_selector) override;
+
+ private:
+  OpStatsLogger* op_stats_logger_;
+  LogManager* log_manager_;
+  bool opstats_last_successful_contribution_criteria_;
+};
+
+}  // namespace opstats
+}  // namespace client
+}  // namespace fcp
+
+#endif  // FCP_CLIENT_OPSTATS_OPSTATS_EXAMPLE_STORE_H_