src/kudu/util/oid_generator.h

// Copyright 2012 Cloudera, 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 KUDU_UTIL_OID_GENERATOR_H
#define KUDU_UTIL_OID_GENERATOR_H

#include <boost/uuid/uuid_generators.hpp>
#include <string>

#include "kudu/gutil/macros.h"
#include "kudu/util/locks.h"

namespace kudu {

// Generates a unique 32byte id, based on uuid v4.
// This class is thread safe
class ObjectIdGenerator {
 public:
  ObjectIdGenerator() {}
  ~ObjectIdGenerator() {}

  std::string Next();

 private:
  DISALLOW_COPY_AND_ASSIGN(ObjectIdGenerator);

  typedef simple_spinlock LockType;

  LockType oid_lock_;
  boost::uuids::random_generator oid_generator_;
};

} // namespace kudu

#endif