Exemple #1
0
        public async Task <IPage> SeekAndRead(ulong position, PageType pageType, IBufferPool bufferPool, ColumnInfo[] columnInfos)
        {
            // TODO: this level of serialization is super slow...
            await semaphore.WaitAsync().ConfigureAwait(false);

            try
            {
                this.fileStream.Seek((long)position, SeekOrigin.Begin);

                (Memory <byte> memory, ulong token) = bufferPool.GetMemory();

                return(pageType switch
                {
                    PageType.MixedPage => new MixedPage(this.binaryReader, memory, token, columnInfos),
                    PageType.StringPage => new StringOnlyPage(this.binaryReader),
                    _ => throw new ArgumentException()
                });
            }