ceph/src/arrow/cpp/src/plasma/hash_table_store.h

   1 // Licensed to the Apache Software Foundation (ASF) under one
   2 // or more contributor license agreements.  See the NOTICE file
   3 // distributed with this work for additional information
   4 // regarding copyright ownership.  The ASF licenses this file
   5 // to you under the Apache License, Version 2.0 (the
   6 // "License"); you may not use this file except in compliance
   7 // with the License.  You may obtain a copy of the License at
   8 //
   9 //   http://www.apache.org/licenses/LICENSE-2.0
  10 //
  11 // Unless required by applicable law or agreed to in writing,
  12 // software distributed under the License is distributed on an
  13 // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  14 // KIND, either express or implied.  See the License for the
  15 // specific language governing permissions and limitations
  16 // under the License.
  17
  18 #pragma once
  19
  20 #include <memory>
  21 #include <string>
  22 #include <unordered_map>
  23 #include <vector>
  24
  25 #include "plasma/external_store.h"
  26
  27 namespace plasma {
  28
  29 // This is a sample implementation for an external store, for illustration
  30 // purposes only.
  31
  32 class HashTableStore : public ExternalStore {
  33  public:
  34   HashTableStore() = default;
  35
  36   Status Connect(const std::string& endpoint) override;
  37
  38   Status Get(const std::vector<ObjectID>& ids,
  39              std::vector<std::shared_ptr<Buffer>> buffers) override;
  40
  41   Status Put(const std::vector<ObjectID>& ids,
  42              const std::vector<std::shared_ptr<Buffer>>& data) override;
  43
  44  private:
  45   typedef std::unordered_map<ObjectID, std::string> HashTable;
  46
  47   HashTable table_;
  48 };
  49
  50 }  // namespace plasma