//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public void releaseId(long stableGeneration, long unstableGeneration, long id) throws java.io.IOException
public override void ReleaseId(long stableGeneration, long unstableGeneration, long id)
{
using (PageCursor cursor = _pagedFile.io(_writePageId, Org.Neo4j.Io.pagecache.PagedFile_Fields.PfSharedWriteLock))
{
PageCursorUtil.GoTo(cursor, "free-list write page", _writePageId);
_freelistNode.write(cursor, unstableGeneration, id, _writePos);
_writePos++;
}
if (_writePos >= _freelistNode.maxEntries())
{
// Current free-list write page is full, allocate a new one.
long nextFreelistPage = AcquireNewId(stableGeneration, unstableGeneration, false);
using (PageCursor cursor = _pagedFile.io(_writePageId, Org.Neo4j.Io.pagecache.PagedFile_Fields.PfSharedWriteLock))
{
PageCursorUtil.GoTo(cursor, "free-list write page", _writePageId);
FreelistNode.Initialize(cursor);
// Link previous --> new writer page
FreelistNode.SetNext(cursor, nextFreelistPage);
}
_writePageId = nextFreelistPage;
_writePos = 0;
_monitor.acquiredFreelistPageId(nextFreelistPage);
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: private static void visitMeta(org.neo4j.io.pagecache.PageCursor cursor, GBPTreeVisitor visitor) throws java.io.IOException
private static void VisitMeta(PageCursor cursor, GBPTreeVisitor visitor)
{
PageCursorUtil.GoTo(cursor, "meta page", IdSpace.META_PAGE_ID);
Meta meta = Meta.Read(cursor, null);
visitor.meta(meta);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: private static TreeState readStatePage(org.neo4j.io.pagecache.PageCursor cursor, long pageIdA) throws java.io.IOException
private static TreeState ReadStatePage(PageCursor cursor, long pageIdA)
{
PageCursorUtil.GoTo(cursor, "state page", pageIdA);
TreeState state;
do
{
state = TreeState.Read(cursor);
} while (cursor.ShouldRetry());
checkOutOfBounds(cursor);
return(state);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: private long acquireNewId(long stableGeneration, long unstableGeneration, boolean allowTakeLastFromPage) throws java.io.IOException
private long AcquireNewId(long stableGeneration, long unstableGeneration, bool allowTakeLastFromPage)
{
// Acquire id from free-list or end of store file
long acquiredId = AcquireNewIdFromFreelistOrEnd(stableGeneration, unstableGeneration, allowTakeLastFromPage);
// Zap the page, i.e. set all bytes to zero
using (PageCursor cursor = _pagedFile.io(acquiredId, Org.Neo4j.Io.pagecache.PagedFile_Fields.PfSharedWriteLock))
{
PageCursorUtil.GoTo(cursor, "newly allocated free-list page", acquiredId);
cursor.ZapPage();
// don't initialize node here since this acquisition can be used both for tree nodes
// as well as free-list nodes.
}
return(acquiredId);
}
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Test void shouldFailOnInvalidValues()
internal virtual void ShouldFailOnInvalidValues()
{
// GIVEN
PageCursor cursor = ByteArrayPageCursor.wrap(10);
// WHEN
for (int i = 0; i < 1_000;)
{
long expected = _random.nextLong();
if ((expected & ~_6B_MASK) != 0)
{
// OK here we have an invalid value
cursor.Offset = 0;
assertThrows(typeof(System.ArgumentException), () => PageCursorUtil.put6BLong(cursor, expected));
i++;
}
}
}
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Test void shouldPutAndGet6BLongs()
internal virtual void ShouldPutAndGet6BLongs()
{
// GIVEN
PageCursor cursor = ByteArrayPageCursor.wrap(10);
// WHEN
for (int i = 0; i < 1_000; i++)
{
long expected = _random.nextLong() & _6B_MASK;
cursor.Offset = 0;
PageCursorUtil.Put6BLong(cursor, expected);
cursor.Offset = 0;
long read = PageCursorUtil.Get6BLong(cursor);
// THEN
assertEquals(expected, read);
assertTrue(read >= 0);
assertEquals(0, read & ~_6B_MASK);
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public void visitFreelist(IdProvider_IdProviderVisitor visitor) throws java.io.IOException
public override void VisitFreelist(IdProvider_IdProviderVisitor visitor)
{
if (_readPageId == FreelistNode.NoPageId)
{
return;
}
using (PageCursor cursor = _pagedFile.io(0, Org.Neo4j.Io.pagecache.PagedFile_Fields.PF_SHARED_READ_LOCK))
{
GenerationKeeper generation = new GenerationKeeper();
long prevPage;
long pageId = _readPageId;
int pos = _readPos;
do
{
PageCursorUtil.GoTo(cursor, "free-list", pageId);
visitor.BeginFreelistPage(pageId);
int targetPos = pageId == _writePageId ? _writePos : _freelistNode.maxEntries();
while (pos < targetPos)
{
// Read next un-acquired id
long unacquiredId;
do
{
unacquiredId = _freelistNode.read(cursor, long.MaxValue, pos, generation);
} while (cursor.ShouldRetry());
visitor.FreelistEntry(unacquiredId, generation.Generation, pos);
pos++;
}
visitor.EndFreelistPage(pageId);
prevPage = pageId;
pos = 0;
do
{
pageId = FreelistNode.Next(cursor);
} while (cursor.ShouldRetry());
} while (prevPage != _writePageId);
}
}
/// <summary>
/// Moves the provided {@code cursor} to the current root id and returning the generation where
/// that root id was assigned.
/// </summary>
/// <param name="cursor"> <seealso cref="PageCursor"/> to place at the current root id. </param>
/// <returns> the generation where the current root was assigned. </returns>
/// <exception cref="IOException"> on <seealso cref="PageCursor"/> error. </exception>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: long goTo(org.neo4j.io.pagecache.PageCursor cursor) throws java.io.IOException
internal virtual long GoTo(PageCursor cursor)
{
PageCursorUtil.GoTo(cursor, "root", _rootId);
return(_rootGeneration);
}
/// <summary>
/// Initialize state pages because new pages are expected to be allocated directly after
/// the existing highest allocated page. Otherwise there'd be a hole between meta and root pages
/// until they would have been written, which isn't guaranteed to be handled correctly by the page cache.
/// </summary>
/// <param name="cursor"> <seealso cref="PageCursor"/> assumed to be opened with write capabilities. </param>
/// <exception cref="IOException"> on <seealso cref="PageCursor"/> error. </exception>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: static void initializeStatePages(org.neo4j.io.pagecache.PageCursor cursor) throws java.io.IOException
internal static void InitializeStatePages(PageCursor cursor)
{
PageCursorUtil.GoTo(cursor, "State page A", IdSpace.STATE_PAGE_A);
PageCursorUtil.GoTo(cursor, "State page B", IdSpace.STATE_PAGE_B);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: static void goTo(org.neo4j.io.pagecache.PageCursor cursor, String messageOnError, long nodeId) throws java.io.IOException
internal static void GoTo(PageCursor cursor, string messageOnError, long nodeId)
{
PageCursorUtil.GoTo(cursor, messageOnError, GenerationSafePointerPair.Pointer(nodeId));
}