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rocksdb

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RocksDB for Erlang

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rocksdb c_src env.h
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c_src/env.h 

// -------------------------------------------------------------------

// Copyright (c) 2016 Benoit Chesneau. All Rights Reserved.

// Copyright (c) 2011-2013 Basho Technologies, Inc. All Rights Reserved.

//

// This file is provided 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/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 INCL_ENV_H

#define INCL_ENV_H



#include <syslog.h>

#include "rocksdb/db.h"

#include "rocksdb/cache.h"



#ifndef INCL_THREADING_H

    #include "threading.h"

#endif



namespace erocksdb {

 /** struct for grabbing erocksdb environment options via fold

 *   ... then loading said options into erocksdb_priv_data

 */

struct DbOptions

{

    int m_DbThreads;



    DbOptions()

        : m_DbThreads(71)

        {};



    void Dump()

    {

        syslog(LOG_ERR, "         m_ErocksdbThreads: %d\n", m_DbThreads);

    }   // Dump

};  // struct erocksdb::DbOptions



static int kCapacity = 4194304; // default values, can be overridden



/** Module-level private data:

 *    singleton instance held by erlang and passed on API calls

 */

class PrivData

{

public:

    DbOptions m_Opts;

    erocksdb::erocksdb_thread_pool thread_pool;

    std::shared_ptr<rocksdb::Cache> block_cache;



    explicit PrivData(DbOptions & Options)

    : m_Opts(Options),

      thread_pool(Options.m_DbThreads)

        { block_cache = rocksdb::NewLRUCache(kCapacity); }



private:

    PrivData();                                      // no default constructor

    PrivData(const PrivData&);             // nocopy

    PrivData& operator=(const PrivData&);  // nocopyassign



};



}



#endif