rabbit.proxy
Class FileResourceSource

java.lang.Object
  rabbit.proxy.FileResourceSource

All Implemented Interfaces:

ResourceSource, Transferable

Direct Known Subclasses:

CacheResourceSource

public class FileResourceSource
extends Object
implements ResourceSource

A resource that comes from a file.

Author:

Robert Olofsson

Field Summary

protected BufferHandle	bufHandle
protected FileChannel	fc

Constructor Summary

FileResourceSource(String filename, TaskRunner tr, BufferHandler bufHandler)

Method Summary

void	addBlockListener(BlockListener listener) Generally we do not come into this method, but it can happen..
long	length() Get the length of the resource in bytes.
void	release(Connection con) Release any held resources.
boolean	supportsTransfer() FileChannels can be used, will always return true.
long	transferTo(long position, long count, WritableByteChannel target) Transfers bytes from this channel's file to the given writable byte channel.

Methods inherited from class java.lang.Object

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

Field Detail

fc

protected FileChannel fc

bufHandle

protected BufferHandle bufHandle

Constructor Detail

FileResourceSource

public FileResourceSource(String filename,
                          TaskRunner tr,
                          BufferHandler bufHandler)
                   throws IOException

Throws:

IOException

Method Detail

supportsTransfer

public boolean supportsTransfer()

FileChannels can be used, will always return true.

Specified by:

supportsTransfer in interface ResourceSource

Returns:

true

length

public long length()

Description copied from interface: ResourceSource

Get the length of the resource in bytes.

Specified by:

length in interface ResourceSource

Specified by:

length in interface Transferable

Returns:

the size of the resource or -1 if unknown.

transferTo

public long transferTo(long position,
                       long count,
                       WritableByteChannel target)
                throws IOException

Description copied from interface: Transferable

Transfers bytes from this channel's file to the given writable byte channel.

Specified by:

transferTo in interface Transferable

Parameters:

position - The position within the file at which the transfer is to begin; must be non-negative

count - The maximum number of bytes to be transferred; must be non-negative

target - The target channel

Returns:

The number of bytes, possibly zero, that were actually transferred

Throws:

IOException

See Also:

transferTo

addBlockListener

public void addBlockListener(BlockListener listener)

Generally we do not come into this method, but it can happen..

Specified by:

addBlockListener in interface ResourceSource

release

public void release(Connection con)

Description copied from interface: ResourceSource

Release any held resources.

Specified by:

release in interface ResourceSource

Parameters:

con - the Connection handling the resource.