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diff --git a/cpp/src/ondemand_supply_task.h b/cpp/src/ondemand_supply_task.h
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+// Copyright (C) 2014 Google Inc.
+//
+// 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 I18N_ADDRESSINPUT_ONDEMAND_SUPPLY_TASK_H_
+#define I18N_ADDRESSINPUT_ONDEMAND_SUPPLY_TASK_H_
+
+#include <libaddressinput/supplier.h>
+#include <libaddressinput/util/basictypes.h>
+#include <libaddressinput/util/scoped_ptr.h>
+
+#include <map>
+#include <set>
+#include <string>
+
+#include "retriever.h"
+
+namespace i18n {
+namespace addressinput {
+
+class LookupKey;
+class Retriever;
+class Rule;
+
+// An OndemandSupplyTask object encapsulates the information necessary to
+// retrieve the set of Rule objects corresponding to a LookupKey and call a
+// callback when that has been done. Calling the Retrieve() method will load
+// required metadata, then call the callback and delete the OndemandSupplyTask
+// object itself.
+class OndemandSupplyTask {
+ public:
+  OndemandSupplyTask(const LookupKey& lookup_key,
+                     std::map<std::string, const Rule*>* rules,
+                     const Supplier::Callback& supplied);
+  ~OndemandSupplyTask();
+
+  // Adds lookup key string |key| to the queue of data to be retrieved.
+  void Queue(const std::string& key);
+
+  // Retrieves and parses data for all queued keys, then calls |supplied_|.
+  void Retrieve(const Retriever& retriever);
+
+  Supplier::RuleHierarchy hierarchy_;
+
+ private:
+  void Load(bool success, const std::string& key, const std::string& data);
+  void Loaded();
+
+  std::set<std::string> pending_;
+  const LookupKey& lookup_key_;
+  std::map<std::string, const Rule*>* const rule_cache_;
+  const Supplier::Callback& supplied_;
+  const scoped_ptr<const Retriever::Callback> retrieved_;
+  bool success_;
+
+  DISALLOW_COPY_AND_ASSIGN(OndemandSupplyTask);
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_ONDEMAND_SUPPLY_TASK_H_