public MetadataManager(IPageManager pageAllocator, HeapWithOffsets <char[]> stringHeap, IBootPageAllocator bootPageAllocator, ILogManager logManager)
{
this.pageAllocator = pageAllocator;
this.stringHeap = stringHeap;
this.logManager = logManager;
if (!bootPageAllocator.BootPageInitialized())
{
using (ITransaction tran = this.logManager.CreateTransaction(this.pageAllocator, false, "GET_BOOT_PAGE"))
using (Releaser releaser = tran.AcquireLock(IBootPageAllocator.BootPageId, LockManager.LockTypeEnum.Exclusive).Result)
{
bootPageAllocator.AllocatePageBootPage(PageType.MixedPage, this.masterPageColumnDefinition, tran);
this.masterMetadataCollection = new PageListCollection(this.pageAllocator, this.masterPageColumnDefinition, IBootPageAllocator.BootPageId);
tran.Commit();
}
MetadataInitialSetup();
}
else
{
using (ITransaction tran = this.logManager.CreateTransaction(this.pageAllocator, false, "GET_BOOT_PAGE"))
{
using Releaser releaser = tran.AcquireLock(IBootPageAllocator.BootPageId, LockManager.LockTypeEnum.Exclusive).Result;
this.masterMetadataCollection = new PageListCollection(this.pageAllocator, this.masterPageColumnDefinition, IBootPageAllocator.BootPageId);
tran.Commit();
}
}
}
public async Task Add(RowHolder item, ITransaction tran)
{
MixedPage currPage = null;
for (ulong currPageId = this.lastPageId; currPageId != PageManagerConstants.NullPageId; currPageId = currPage.NextPageId())
{
using Releaser lck = await tran.AcquireLock(currPageId, LockManager.LockTypeEnum.Shared).ConfigureAwait(false);
currPage = await pageAllocator.GetMixedPage(currPageId, tran, this.columnTypes).ConfigureAwait(false);
if (currPage.CanFit(item, tran))
{
lck.Dispose();
using Releaser writeLock = await tran.AcquireLock(currPageId, LockManager.LockTypeEnum.Exclusive).ConfigureAwait(false);
// Need to check can fit one more time.
if (currPage.CanFit(item, tran))
{
currPage.Insert(item, tran);
return;
}
}
}
{
using Releaser prevPageLck = await tran.AcquireLock(currPage.PageId(), LockManager.LockTypeEnum.Exclusive).ConfigureAwait(false);
if (currPage.NextPageId() != PageManagerConstants.NullPageId)
{
// TODO: it would be good if caller had ability to control this lock.
// This dispose doesn't mean anything in current implementation of read committed.
prevPageLck.Dispose();
await Add(item, tran).ConfigureAwait(false);
}
else
{
currPage = await this.pageAllocator.AllocateMixedPage(this.columnTypes, currPage.PageId(), PageManagerConstants.NullPageId, tran).ConfigureAwait(false);
using Releaser currPageLck = await tran.AcquireLock(currPage.PageId(), LockManager.LockTypeEnum.Exclusive).ConfigureAwait(false);
this.lastPageId = currPage.PageId();
currPage.Insert(item, tran);
}
}
}
public async Task <char[]> Fetch(PagePointerOffsetPair loc, ITransaction tran)
{
using Releaser lckReleaser = await tran.AcquireLock((ulong) loc.PageId, LockManager.LockTypeEnum.Shared).ConfigureAwait(false);
StringOnlyPage page = await allocator.GetPageStr((ulong)loc.PageId, tran).ConfigureAwait(false);
return(page.FetchWithOffset((uint)loc.OffsetInPage, tran));
}
public async Task <PagePointerOffsetPair> Add(char[] item, ITransaction tran)
{
StringOnlyPage currPage = null;
int offset;
for (ulong currPageId = this.lastPageId; currPageId != PageManagerConstants.NullPageId; currPageId = currPage.NextPageId())
{
using Releaser lckReleaser = await tran.AcquireLock(currPageId, LockManager.LockTypeEnum.Shared).ConfigureAwait(false);
currPage = await allocator.GetPageStr(currPageId, tran).ConfigureAwait(false);
if (currPage.CanFit(item))
{
lckReleaser.Dispose();
using Releaser writeLock = await tran.AcquireLock(currPageId, LockManager.LockTypeEnum.Exclusive).ConfigureAwait(false);
// Need to check can fit one more time.
if (currPage.CanFit(item))
{
offset = currPage.Insert(item, tran);
return(new PagePointerOffsetPair((long)currPage.PageId(), (int)offset));
}
}
}
{
using Releaser prevPage = await tran.AcquireLock(currPage.PageId(), LockManager.LockTypeEnum.Exclusive).ConfigureAwait(false);
if (currPage.NextPageId() != PageManagerConstants.NullPageId)
{
prevPage.Dispose();
return(await Add(item, tran).ConfigureAwait(false));
}
else
{
currPage = await this.allocator.AllocatePageStr(currPage.PageId(), PageManagerConstants.NullPageId, tran).ConfigureAwait(false);
using Releaser lckReleaser = await tran.AcquireLock(currPage.PageId(), LockManager.LockTypeEnum.Exclusive).ConfigureAwait(false);
offset = currPage.Insert(item, tran);
this.lastPageId = currPage.PageId();
return(new PagePointerOffsetPair((long)currPage.PageId(), (int)offset));
}
}
}
public async IAsyncEnumerable <RowHolder> Iterate(ITransaction tran)
{
MixedPage currPage;
for (ulong currPageId = collectionRootPageId; currPageId != PageManagerConstants.NullPageId; currPageId = currPage.NextPageId())
{
using Releaser lck = await tran.AcquireLock(currPageId, LockManager.LockTypeEnum.Shared).ConfigureAwait(false);
currPage = await pageAllocator.GetMixedPage(currPageId, tran, this.columnTypes).ConfigureAwait(false);
foreach (RowHolder rhf in currPage.Fetch(tran))
{
yield return(rhf);
}
}
}
public async Task <ulong> Count(ITransaction tran)
{
ulong rowCount = 0;
IPage currPage;
for (ulong currPageId = collectionRootPageId; currPageId != PageManagerConstants.NullPageId; currPageId = currPage.NextPageId())
{
using Releaser lck = await tran.AcquireLock(currPageId, LockManager.LockTypeEnum.Shared).ConfigureAwait(false);
currPage = await pageAllocator.GetMixedPage(currPageId, tran, this.columnTypes).ConfigureAwait(false);
rowCount += currPage.RowCount();
}
return(rowCount);
}
public async Task <U> Max <U>(Func <RowHolder, U> projector, U startMin, ITransaction tran) where U : IComparable
{
MixedPage currPage;
U max = startMin;
for (ulong currPageId = collectionRootPageId; currPageId != PageManagerConstants.NullPageId; currPageId = currPage.NextPageId())
{
using Releaser lck = await tran.AcquireLock(currPageId, LockManager.LockTypeEnum.Shared).ConfigureAwait(false);
currPage = await pageAllocator.GetMixedPage(currPageId, tran, this.columnTypes).ConfigureAwait(false);
foreach (RowHolder rhf in currPage.Fetch(tran))
{
U curr = projector(rhf);
if (curr.CompareTo(max) == 1)
{
max = curr;
}
}
}
return(max);
}
