org.apache.cassandra.io.util

Class NIODataInputStream

java.lang.Object

java.io.InputStream

org.apache.cassandra.io.util.RebufferingInputStream

org.apache.cassandra.io.util.NIODataInputStream

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.lang.AutoCloseable, DataInputPlus

public class NIODataInputStream
extends RebufferingInputStream

Rough equivalent of BufferedInputStream and DataInputStream wrapping the input stream of a File or Socket Created to work around the fact that when BIS + DIS delegate to NIO for socket IO they will allocate large thread local direct byte buffers when a large array is used to read. There may also be some performance improvement due to using a DBB as the underlying buffer for IO and the removal of some indirection and delegation when it comes to reading out individual values, but that is not the goal. Closing NIODataInputStream will invoke close on the ReadableByteChannel provided at construction. NIODataInputStream is not thread safe.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.io.util.DataInputPlus

DataInputPlus.DataInputStreamPlus

Field Summary

Fields

Modifier and Type	Field and Description
protected java.nio.channels.ReadableByteChannel	channel

Fields inherited from class org.apache.cassandra.io.util.RebufferingInputStream

buffer

Constructor Summary

Constructors

Constructor and Description
NIODataInputStream(java.nio.channels.ReadableByteChannel channel, java.nio.ByteBuffer buffer)
NIODataInputStream(java.nio.channels.ReadableByteChannel channel, int bufferSize)

Method Summary

Modifier and Type	Method and Description
int	available()
void	close()
protected void	reBuffer() Implementations must implement this method to refill the buffer.

Methods inherited from class org.apache.cassandra.io.util.RebufferingInputStream

markSupported, read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readPrimitiveSlowly, readShort, readUnsignedByte, readUnsignedShort, readUnsignedVInt, readUTF, readVInt, reset, skipBytes

Methods inherited from class java.io.InputStream

mark, read, skip

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.io.util.DataInputPlus

skipBytesFully

Field Detail

channel

protected final java.nio.channels.ReadableByteChannel channel

Constructor Detail

NIODataInputStream

public NIODataInputStream(java.nio.channels.ReadableByteChannel channel,
                          java.nio.ByteBuffer buffer)

NIODataInputStream

public NIODataInputStream(java.nio.channels.ReadableByteChannel channel,
                          int bufferSize)

Method Detail

reBuffer

protected void reBuffer()
                 throws java.io.IOException

Description copied from class: RebufferingInputStream

Implementations must implement this method to refill the buffer. They can expect the buffer to be empty when this method is invoked.

Specified by:

reBuffer in class RebufferingInputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException