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RaptorDB - The Document Store

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24 Jul 2019CPOL86 min read 2.3M   16.3K   653  
NoSql, JSON based, Document store database with compiled .net map functions and automatic hybrid bitmap indexing and LINQ query filters (now with standalone Server mode, Backup and Active Restore, Transactions, Server side queries, MonoDroid support, HQ-Branch Replication, working in Linux, .net
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using RaptorDB.Common;

namespace RaptorDB
{
    #region [  TypeIndexes  ]
    internal class TypeIndexes<T> : MGIndex<T>, IIndex where T : IComparable<T>
    {
        public TypeIndexes(string path, string filename, byte keysize)
            : base(path, filename + ".mgidx", keysize, Global.PageItemCount, true)
        {

        }

        public void Set(object key, int recnum)
        {
            if (key == null) return; // FEATURE : index null values ??

            base.Set((T)key, recnum);
        }

        public WAHBitArray Query(RDBExpression ex, object from)
        {
            T f = default(T);
            if (typeof(T).Equals(from.GetType()) == false)
            {
                f = (T)Convert.ChangeType(from, typeof(T));
            }
            else
                f = (T)from;
            return base.Query(ex, f);
        }

        void IIndex.FreeMemory()
        {
            base.FreeMemory();
        }

        void IIndex.Shutdown()
        {
            base.SaveIndex();
            base.Shutdown();
        }
    }
    #endregion

    #region [  BoolIndex  ]
    internal class BoolIndex : IIndex
    {
        public BoolIndex(string path, string filename)
        {
            // create file
            _filename = filename;
            if (_filename.Contains(".") == false) _filename += ".idx";
            _path = path;
            if (_path.EndsWith("\\") == false) _path += "\\";

            if (File.Exists(_path + _filename))
                ReadFile();
        }

        private WAHBitArray _bits = new WAHBitArray();
        private string _filename;
        private string _path;
        private object _lock = new object();
        private bool _inMemory = false;

        public WAHBitArray GetBits()
        {
            return _bits.Copy();
        }

        public void Set(object key, int recnum)
        {
            _bits.Set(recnum, (bool)key);
        }

        public WAHBitArray Query(RDBExpression ex, object from)
        {
            bool b = (bool)from;
            if (b)
                return _bits;
            else
                return _bits.Not();
        }

        public void FreeMemory()
        {
            // free memory
            _bits.FreeMemory();
        }

        public void Shutdown()
        {
            // shutdown
            if (_inMemory == false)
                WriteFile();
        }

        public void SaveIndex()
        {
            if (_inMemory == false)
                WriteFile();
        }

        public void InPlaceOR(WAHBitArray left)
        {
            _bits = _bits.Or(left);
        }

        private void WriteFile()
        {
            uint[] ints = _bits.GetCompressed();
            MemoryStream ms = new MemoryStream();
            BinaryWriter bw = new BinaryWriter(ms);
            foreach (var i in ints)
            {
                bw.Write(i);
            }
            File.WriteAllBytes(_path + _filename, ms.ToArray());
        }

        private void ReadFile()
        {
            byte[] b = File.ReadAllBytes(_path + _filename);
            List<uint> ints = new List<uint>();
            for (int i = 0; i < b.Length / 4; i++)
            {
                ints.Add((uint)Helper.ToInt32(b, i * 4));
            }
            _bits = new WAHBitArray(WAHBitArray.TYPE.Compressed_WAH, ints.ToArray());
        }

        internal WAHBitArray Not()
        {
            return _bits.Not();
        }
    }
    #endregion

    #region [  FullTextIndex  ]
    internal class FullTextIndex : Hoot, IIndex
    {
        public FullTextIndex(string IndexPath, string FileName)
            : base(IndexPath, FileName)
        {

        }

        public void Set(object key, int recnum)
        {
            base.Index(recnum, (string)key);
        }

        public WAHBitArray Query(RDBExpression ex, object from)
        {
            return base.Query("" + from);
        }

        public void FreeMemory()
        {
            base.FreeMemory(true);
        }

        public void SaveIndex()
        {
            base.Save();
        }
    }
    #endregion
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Architect -
United Kingdom United Kingdom
Mehdi first started programming when he was 8 on BBC+128k machine in 6512 processor language, after various hardware and software changes he eventually came across .net and c# which he has been using since v1.0.
He is formally educated as a system analyst Industrial engineer, but his programming passion continues.

* Mehdi is the 5th person to get 6 out of 7 Platinum's on Code-Project (13th Jan'12)
* Mehdi is the 3rd person to get 7 out of 7 Platinum's on Code-Project (26th Aug'16)

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