| Commit message (Collapse) | Author | Age | Files | Lines |
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save mapped ByteBuffer memory
Also:
- fix dbgDump(..) FileChannel access, test if openend.
- add DEBUG dumps on CTOR, Close and notifyLengthChangeImpl
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FLUSH_PRE_SOFT)
FLUSH_PRE_SOFT cannot be handled by some platforms, e.g. Windows 32bit.
FLUSH_PRE_HARD is the most reliable caching mode
and it will fallback to FLUSH_PRE_SOFT if no method for 'cleaner' exists.
Further, FLUSH_PRE_HARD turns our to be the fastest mode as well.
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- Validate active and GC'ed mapped-buffer count
in cleanAllSlices() via close() ..
- Fix missing unmapping last buffer in notifyLengthChangeImpl(),
branch criteria was off by one.
- cleanSlice(..) now also issues cleanBuffer(..) on the GC'ed entry,
hence if WeakReference is still alive, enforce it's release.
- cleanBuffer(..) reverts FLUSH_PRE_HARD -> FLUSH_PRE_SOFT
in case of an error.
- flush() -> flush(boolean metaData) to expose FileChannel.force(metaData).
- Add synchronous mode, flushing/syncing the mapped buffers when
in READ_WRITE mapping mode and issue FileChannel.force() if not READ_ONLY.
Above is implemented via flush()/flushImpl(..) for buffers and FileChannel,
as well as in syncSlice(..) for buffers only.
flush*()/syncSlice() is covered by:
- setLength()
- notifyLengthChange*(..)
- nextSlice()
Always issue flushImpl() in close().
- Windows: Clean all buffers in setLength(),
otherwise Windows will report:
- Windows: Catch MappedByteBuffer.force() IOException
- Optimization of position(..)
position(..) is now standalone to allow issuing flushSlice(..)
before gathering the new mapped buffer.
This shall avoid one extra cache miss.
Hence rename positionImpl(..) -> position2(..).
- All MappedByteBufferOutputStream.write(..) methods
issue syncSlice(..) on the last written current slice
to ensure new 'synchronous' mode is honored.
+++
Unit tests:
- Ensure test files are being deleted
- TestByteBufferCopyStream: Reduced test file size to more sensible values.
-
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to stream copy as well as direct memory mapped ByteBuffer access
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OutputStream impl.
Added MappedByteBufferOutputStream as a child instance of MappedByteBufferInputStream,
since the latter already manages the file's mapped buffer slices.
Current design is:
- MappedByteBufferInputStream (parent)
- MappedByteBufferOutputStream
this is due to InputStream and OutputStream not being interfaces,
but most functionality is provided in one class.
We could redesign both as follows:
- MappedByteBufferIOStream (parent)
- MappedByteBufferInputStream
- MappedByteBufferOutputStream
This might visualize things better .. dunno whether its worth the
extra redirection.
+++
MappedByteBufferInputStream:
- Adding [file] resize support via custom FileResizeOp
- All construction happens via ctors
- Handle refCount, incr. by ctor and getOutputStream(..), decr by close
- Check whether stream is closed already -> IOException
- Simplify / Reuse code
MappedByteBufferOutputStream:
- Adding simple write operations
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IOException (Add note to FLUSH_NONE); Reduce test load / duration.
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InputStream impl., incl. mark/reset
- ByteBufferInputStream simply impl. InputStream for an arbitrary 2MiB restricted ByteBuffer
- Users may only need a smaller implementation for 'smaller' file sizes
or for streaming a [native] ByteBuffer.
- MappedByteBufferInputStream impl. InputStream for any file size,
while slicing the total size to memory mapped buffers via the given FileChannel.
The latter are mapped lazily and diff. flush/cache methods are supported
to ease virtual memory usage.
- TestByteBufferInputStream: Basic unit test for basic functionality and perf. stats.
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