Microsoft.Isam.Esent.Interop.MemoryCache.Allocate C# (CSharp) Method

        public byte[] Allocate()
        {
            int offset = this.GetStartingOffset();
            for (int i = 0; i < this.cachedBuffers.Length; ++i)
            {
                int index = (i + offset) % this.cachedBuffers.Length;
                byte[] buffer = Interlocked.Exchange(ref this.cachedBuffers[index], null);
                if (null != buffer)
                {
                    return buffer;
                }
            }

               return new byte[this.bufferSize];
        }

        /// <summary>
        /// Update the tableid and position the tableid on the record that was modified.
        /// This can be useful when inserting a record because by default the tableid
        /// remains in its old location.
        /// </summary>
        /// <remarks>
        /// Save is the final step in performing an insert or an update. The update is begun by
        /// calling creating an Update object and then by calling JetSetColumn or JetSetColumns one or more times
        /// to set the record state. Finally, Update is called to complete the update operation.
        /// Indexes are updated only by Update or and not during JetSetColumn or JetSetColumns
        /// </remarks>
        public void SaveAndGotoBookmark()
        {
            var bookmark = bookmarkCache.Allocate();
            int actualBookmarkSize;

            this.Save(bookmark, bookmark.Length, out actualBookmarkSize);
            Api.JetGotoBookmark(this.sesid, this.tableid, bookmark, actualBookmarkSize);
            bookmarkCache.Free(bookmark);
        }