Package org.apache.flink.state.forst.fs.cache

Class CachedDataInputStream

java.lang.Object

java.io.InputStream

org.apache.flink.core.fs.FSDataInputStream

org.apache.flink.state.forst.fs.cache.CachedDataInputStream

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.flink.core.fs.ByteBufferReadable

public class CachedDataInputStream
extends org.apache.flink.core.fs.FSDataInputStream
implements org.apache.flink.core.fs.ByteBufferReadable

A FSDataInputStream delegates requests to other one and supports reading data with ByteBuffer. One CachedDataInputStream only supports one thread reading which is guaranteed by ByteBufferReadableFSDataInputStream. The cached input stream might be closed by eviction by other thread, and the concurrency between reading and evicting is controlled by the reference count of the cache entry.

Constructor Summary

Constructors

Constructor	Description
CachedDataInputStream(FileBasedCache fileBasedCache, FileCacheEntry cacheEntry, org.apache.flink.core.fs.FSDataInputStream originalStream)
CachedDataInputStream(FileBasedCache fileBasedCache, FileCacheEntry cacheEntry, org.apache.flink.core.fs.FSDataInputStream cacheStream, org.apache.flink.core.fs.FSDataInputStream originalStream)

Method Summary

Modifier and Type	Method	Description
int	available()
void	close()
long	getPos()
boolean	isClosed()
void	mark(int readlimit)
boolean	markSupported()
int	read()
int	read(byte[] b)
int	read(byte[] b, int off, int len)
int	read(long position, ByteBuffer bb)
int	read(ByteBuffer bb)
void	reset()
void	seek(long desired)
long	skip(long n)

Methods inherited from class java.io.InputStream

nullInputStream, readAllBytes, readNBytes, readNBytes, transferTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CachedDataInputStream

public CachedDataInputStream(FileBasedCache fileBasedCache,
                             FileCacheEntry cacheEntry,
                             org.apache.flink.core.fs.FSDataInputStream cacheStream,
                             org.apache.flink.core.fs.FSDataInputStream originalStream)

CachedDataInputStream

public CachedDataInputStream(FileBasedCache fileBasedCache,
                             FileCacheEntry cacheEntry,
                             org.apache.flink.core.fs.FSDataInputStream originalStream)

Method Detail

seek

public void seek(long desired)
          throws IOException

Specified by:

seek in class org.apache.flink.core.fs.FSDataInputStream

Throws:

IOException

getPos

public long getPos()
            throws IOException

Specified by:

getPos in class org.apache.flink.core.fs.FSDataInputStream

Throws:

IOException

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] b)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class InputStream

Throws:

IOException

available

public int available()
              throws IOException

Overrides:

available in class InputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException

isClosed

public boolean isClosed()

mark

public void mark(int readlimit)

Overrides:

mark in class InputStream

reset

public void reset()
           throws IOException

Overrides:

reset in class InputStream

Throws:

IOException

markSupported

public boolean markSupported()

Overrides:

markSupported in class InputStream

read

public int read(ByteBuffer bb)
         throws IOException

Specified by:

read in interface org.apache.flink.core.fs.ByteBufferReadable

Throws:

IOException

read

public int read(long position,
                ByteBuffer bb)
         throws IOException

Specified by:

read in interface org.apache.flink.core.fs.ByteBufferReadable

Throws:

IOException