Class DfsOutputStream
- java.lang.Object
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- java.io.OutputStream
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- org.eclipse.jgit.internal.storage.dfs.DfsOutputStream
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- All Implemented Interfaces:
Closeable
,Flushable
,AutoCloseable
public abstract class DfsOutputStream extends OutputStream
Output stream to create a file on the DFS.
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Constructor Summary
Constructors Constructor Description DfsOutputStream()
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods Modifier and Type Method Description int
blockSize()
Get the recommended alignment for writing.abstract int
read(long position, ByteBuffer buf)
Read back a portion of already written data.abstract void
write(byte[] buf, int off, int len)
void
write(int b)
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Methods inherited from class java.io.OutputStream
close, flush, nullOutputStream, write
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Method Detail
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blockSize
public int blockSize()
Get the recommended alignment for writing.Starting a write at multiples of the blockSize is more efficient than starting a write at any other position. If 0 or -1 the channel does not have any specific block size recommendation.
Channels should not recommend large block sizes. Sizes up to 1-4 MiB may be reasonable, but sizes above that may be horribly inefficient.
- Returns:
- recommended alignment size for randomly positioned reads. Does not need to be a power of 2.
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write
public void write(int b) throws IOException
- Specified by:
write
in classOutputStream
- Throws:
IOException
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write
public abstract void write(byte[] buf, int off, int len) throws IOException
- Overrides:
write
in classOutputStream
- Throws:
IOException
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read
public abstract int read(long position, ByteBuffer buf) throws IOException
Read back a portion of already written data.The writing position of the output stream is not affected by a read.
- Parameters:
position
- offset to read from.buf
- buffer to populate. Up tobuf.remaining()
bytes will be read fromposition
.- Returns:
- number of bytes actually read.
- Throws:
IOException
- reading is not supported, or the read cannot be performed due to DFS errors.
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