private void FlushAndCloseWithoutFail(MuninnPagedFile file)
{
bool flushedAndClosed = false;
bool printedFirstException = false;
do
{
try
{
file.FlushAndForceForClose();
file.CloseSwapper();
flushedAndClosed = true;
}
catch (IOException e)
{
if (_printExceptionsOnClose && !printedFirstException)
{
printedFirstException = true;
try
{
Console.WriteLine(e.ToString());
Console.Write(e.StackTrace);
}
catch (Exception)
{
}
}
}
} while (!flushedAndClosed);
}
internal virtual void Unmap(MuninnPagedFile file)
{
lock (this)
{
if (file.DecrementRefCount())
{
// This was the last reference!
// Find and remove the existing mapping:
FileMapping prev = null;
FileMapping current = _mappedFiles;
while (current != null)
{
if (current.PagedFile == file)
{
if (prev == null)
{
_mappedFiles = current.Next;
}
else
{
prev.Next = current.Next;
}
_pageCacheTracer.unmappedFile(current.File);
FlushAndCloseWithoutFail(file);
break;
}
prev = current;
current = current.Next;
}
}
}
}
/// <summary>
/// Cursor factory construction </summary>
/// <param name="pagedFile"> paged file for which cursor is created </param>
/// <param name="pageCursorTracerSupplier"> supplier of thread local (transaction local) page cursor tracers that will
/// provide thread local page cache statistics </param>
/// <param name="pageCacheTracer"> global page cache tracer </param>
/// <param name="versionContextSupplier"> version context supplier </param>
internal CursorFactory(MuninnPagedFile pagedFile, PageCursorTracerSupplier pageCursorTracerSupplier, PageCacheTracer pageCacheTracer, VersionContextSupplier versionContextSupplier)
{
this._pagedFile = pagedFile;
this._victimPage = pagedFile.PageCache.victimPage;
this._pageCursorTracerSupplier = pageCursorTracerSupplier;
this._pageCacheTracer = pageCacheTracer;
this._versionContextSupplier = versionContextSupplier;
}
internal void Initialise(MuninnPagedFile pagedFile, long pageId, int pfFlags)
{
this.Swapper = pagedFile.Swapper;
this.SwapperId = pagedFile.SwapperId;
this._filePageSize = pagedFile.FilePageSize;
this.PagedFile = pagedFile;
this.PageId = pageId;
this.PfFlags = pfFlags;
this.EagerFlush = IsFlagRaised(pfFlags, PF_EAGER_FLUSH);
this.NoFault = IsFlagRaised(pfFlags, PF_NO_FAULT);
this.NoGrow = NoFault | IsFlagRaised(pfFlags, Org.Neo4j.Io.pagecache.PagedFile_Fields.PfNoGrow);
}
/// <summary>
/// Pin the desired file page to this cursor, page faulting it into memory if it isn't there already. </summary>
/// <param name="filePageId"> The file page id we want to pin this cursor to. </param>
/// <param name="writeLock"> 'true' if we will be taking a write lock on the page as part of the pin. </param>
/// <exception cref="IOException"> if anything goes wrong with the pin, most likely during a page fault. </exception>
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: protected void pin(long filePageId, boolean writeLock) throws java.io.IOException
protected internal virtual void Pin(long filePageId, bool writeLock)
{
PinEvent = _tracer.beginPin(writeLock, filePageId, Swapper);
int chunkId = MuninnPagedFile.ComputeChunkId(filePageId);
// The chunkOffset is the addressing offset into the chunk array object for the relevant array slot. Using
// this, we can access the array slot with Unsafe.
long chunkOffset = MuninnPagedFile.ComputeChunkOffset(filePageId);
int[][] tt = PagedFile.translationTable;
if (tt.Length <= chunkId)
{
tt = ExpandTranslationTableCapacity(chunkId);
}
int[] chunk = tt[chunkId];
// Now, if the reference in the chunk slot is a latch, we wait on it and look up again (in a loop, since the
// page might get evicted right after the page fault completes). If we find a page, we lock it and check its
// binding (since it might get evicted and faulted into something else in the time between our look up and
// our locking of the page). If the reference is null or it referred to a page that had wrong bindings, we CAS
// in a latch. If that CAS succeeds, we page fault, set the slot to the faulted in page and open the latch.
// If the CAS failed, we retry the look up and start over from the top.
for ( ;;)
{
int mappedPageId = UnsafeUtil.getIntVolatile(chunk, chunkOffset);
if (mappedPageId != UNMAPPED_TTE)
{
// We got *a* page, but we might be racing with eviction. To cope with that, we have to take some
// kind of lock on the page, and check that it is indeed bound to what we expect. If not, then it has
// been evicted, and possibly even page faulted into something else. In this case, we discard the
// item and try again, as the eviction thread would have set the chunk array slot to null.
long pageRef = PagedFile.deref(mappedPageId);
bool locked = TryLockPage(pageRef);
if (locked & PagedFile.isBoundTo(pageRef, SwapperId, filePageId))
{
PinCursorToPage(pageRef, filePageId, Swapper);
PinEvent.hit();
return;
}
if (locked)
{
UnlockPage(pageRef);
}
}
else
{
if (UncommonPin(filePageId, chunkOffset, chunk))
{
return;
}
}
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public synchronized java.util.Optional<org.neo4j.io.pagecache.PagedFile> getExistingMapping(java.io.File file) throws java.io.IOException
public override Optional <PagedFile> GetExistingMapping(File file)
{
lock (this)
{
AssertHealthy();
EnsureThreadsInitialised();
file = file.CanonicalFile;
MuninnPagedFile pagedFile = TryGetMappingOrNull(file);
if (pagedFile != null)
{
pagedFile.IncrementRefCount();
return(pagedFile);
}
return(null);
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public synchronized java.util.List<org.neo4j.io.pagecache.PagedFile> listExistingMappings() throws java.io.IOException
public override IList <PagedFile> ListExistingMappings()
{
lock (this)
{
AssertNotClosed();
EnsureThreadsInitialised();
IList <PagedFile> list = new List <PagedFile>();
FileMapping current = _mappedFiles;
while (current != null)
{
// Note that we are NOT incrementing the reference count here.
// Calling code is expected to be able to deal with asynchronously closed PagedFiles.
MuninnPagedFile pagedFile = current.PagedFile;
list.Add(pagedFile);
current = current.Next;
}
return(list);
}
}
public override PageCursor OpenLinkedCursor(long pageId)
{
CloseLinkedCursorIfAny();
MuninnPagedFile pf = PagedFile;
if (pf == null)
{
// This cursor has been closed
throw new System.InvalidOperationException("Cannot open linked cursor on closed page cursor");
}
if (LinkedCursor != null)
{
LinkedCursor.initialise(pf, pageId, PfFlags);
LinkedCursor.rewind();
}
else
{
LinkedCursor = ( MuninnPageCursor )pf.Io(pageId, PfFlags);
LinkedCursor.isLinkedCursor = true;
}
return(LinkedCursor);
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: private void flushFile(MuninnPagedFile muninnPagedFile, org.neo4j.io.pagecache.IOLimiter limiter) throws java.io.IOException
private void FlushFile(MuninnPagedFile muninnPagedFile, IOLimiter limiter)
{
try
{
using (MajorFlushEvent fileFlush = _pageCacheTracer.beginFileFlush(muninnPagedFile.Swapper))
{
FlushEventOpportunity flushOpportunity = fileFlush.FlushEventOpportunity();
muninnPagedFile.FlushAndForceInternal(flushOpportunity, false, limiter);
}
}
catch (ClosedChannelException e)
{
if (muninnPagedFile.RefCount > 0)
{
// The file is not supposed to be closed, since we have a positive ref-count, yet we got a
// ClosedChannelException anyway? It's an odd situation, so let's tell the outside world about
// this failure.
throw e;
}
// Otherwise: The file was closed while we were trying to flush it. Since unmapping implies a flush
// anyway, we can safely assume that this is not a problem. The file was flushed, and it doesn't
// really matter how that happened. We'll ignore this exception.
}
}
//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in C#:
//ORIGINAL LINE: public synchronized org.neo4j.io.pagecache.PagedFile map(java.io.File file, int filePageSize, java.nio.file.OpenOption... openOptions) throws java.io.IOException
public override PagedFile Map(File file, int filePageSize, params OpenOption[] openOptions)
{
lock (this)
{
AssertHealthy();
EnsureThreadsInitialised();
if (filePageSize > _cachePageSize)
{
throw new System.ArgumentException("Cannot map files with a filePageSize (" + filePageSize + ") that is greater than the " + "cachePageSize (" + _cachePageSize + ")");
}
file = file.CanonicalFile;
bool createIfNotExists = false;
bool truncateExisting = false;
bool deleteOnClose = false;
bool anyPageSize = false;
bool noChannelStriping = false;
foreach (OpenOption option in openOptions)
{
if (option.Equals(StandardOpenOption.CREATE))
{
createIfNotExists = true;
}
else if (option.Equals(StandardOpenOption.TRUNCATE_EXISTING))
{
truncateExisting = true;
}
else if (option.Equals(StandardOpenOption.DELETE_ON_CLOSE))
{
deleteOnClose = true;
}
else if (option.Equals(PageCacheOpenOptions.ANY_PAGE_SIZE))
{
anyPageSize = true;
}
else if (option.Equals(PageCacheOpenOptions.NO_CHANNEL_STRIPING))
{
noChannelStriping = true;
}
else if (!_ignoredOpenOptions.Contains(option))
{
throw new System.NotSupportedException("Unsupported OpenOption: " + option);
}
}
FileMapping current = _mappedFiles;
// find an existing mapping
while (current != null)
{
if (current.File.Equals(file))
{
MuninnPagedFile pagedFile = current.PagedFile;
if (pagedFile.PageSize() != filePageSize && !anyPageSize)
{
string msg = "Cannot map file " + file + " with " +
"filePageSize " + filePageSize + " bytes, " +
"because it has already been mapped with a " +
"filePageSize of " + pagedFile.PageSize() +
" bytes.";
throw new System.ArgumentException(msg);
}
if (truncateExisting)
{
throw new System.NotSupportedException("Cannot truncate a file that is already mapped");
}
pagedFile.IncrementRefCount();
pagedFile.MarkDeleteOnClose(deleteOnClose);
return(pagedFile);
}
current = current.Next;
}
if (filePageSize < Long.BYTES)
{
throw new System.ArgumentException("Cannot map files with a filePageSize (" + filePageSize + ") that is less than " + Long.BYTES + " bytes");
}
// there was no existing mapping
MuninnPagedFile pagedFile = new MuninnPagedFile(file, this, filePageSize, _swapperFactory, _pageCacheTracer, _pageCursorTracerSupplier, _versionContextSupplier, createIfNotExists, truncateExisting, noChannelStriping);
pagedFile.IncrementRefCount();
pagedFile.MarkDeleteOnClose(deleteOnClose);
current = new FileMapping(file, pagedFile);
current.Next = _mappedFiles;
_mappedFiles = current;
_pageCacheTracer.mappedFile(file);
return(pagedFile);
}
}
