public BPlusTreeNodeStorage(IPageManager pageManager, ISerializer <TKey> keySerializer, int maxKeySize)
{
if (maxKeySize <= 0)
{
throw new ArgumentException("ComparableComparableKeyOf size should be positive", nameof(maxKeySize));
}
_pageManager = pageManager ?? throw new ArgumentNullException(nameof(pageManager));
_keySerializer = keySerializer ?? throw new ArgumentNullException(nameof(keySerializer));
_maxKeySize = maxKeySize;
_nodeEntrySizeRange = DbItem.GetSizeRange(_maxKeySize + DbItemReference.BytesLength);
if (NodeCapacity <= 2)
{
throw new ArgumentException("Too large key size", nameof(maxKeySize));
}
_dbItems = new DbItem[NodeCapacity];
var bytes = new byte[_maxKeySize + DbItemReference.BytesLength];
for (int i = 0; i < NodeCapacity; i++)
{
_dbItems[i] = new DbItem(bytes);
}
_pageCacheEnabled = _pageManager is ICachingPageManager;
}
protected override void Init()
{
base.Init();
//add access-method page
IPage amPage = PageManager.CreatePage();
Debug.Assert(amPage.Index == 2, "The first access method page should have index 2");
var tnph = new BPlusTreeNodePageHeader
{
ParentPageIndex = -1,
PreviousPageIndex = -1,
NextPageIndex = -1,
IsLeaf = true,
SizeRange = DbItem.GetSizeRange(_maxKeySize + sizeof(Int64) + sizeof(Int16))
};
PageFormatter.InitPage(amPage, tnph);
PageManager.UpdatePage(amPage);
}