freenet.client.async

Class SplitFileFetcherCrossSegmentStorage

java.lang.Object

freenet.client.async.SplitFileFetcherCrossSegmentStorage

public class SplitFileFetcherCrossSegmentStorage
extends java.lang.Object

Cross-segments are "in parallel" with the main segments, an interlaced Reed-Solomon scheme similar to that used on CD's, allowing us to fill in blocks from other segments. There are 3 "cross-check blocks" in each segment, and therefore 3 in each cross-segment; the rest are data blocks.

Field Summary

Fields

Modifier and Type	Field and Description
int	crossSegmentNumber
SplitFileFetcherStorage	parent

Constructor Summary

Constructors

Constructor and Description
SplitFileFetcherCrossSegmentStorage(SplitFileFetcherStorage parent, int segNo, java.io.DataInputStream dis)

Method Summary

Modifier and Type	Method and Description
void	addDataBlock(SplitFileFetcherSegmentStorage seg, int blockNum)
void	cancel()
void	checkBlocks() Should be called before scheduling, unlike restart().
boolean	isDecoding()
void	onFetchedRelevantBlock(SplitFileFetcherSegmentStorage segment, int blockNo) Called when a segment fetches a block that it believes to be relevant to us
void	restart() Check for blocks and try to decode.
void	writeFixedMetadata(java.io.DataOutputStream dos)

Methods inherited from class java.lang.Object

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

Field Detail

crossSegmentNumber

public final int crossSegmentNumber

parent

public final SplitFileFetcherStorage parent

Constructor Detail

SplitFileFetcherCrossSegmentStorage

public SplitFileFetcherCrossSegmentStorage(SplitFileFetcherStorage parent,
                                           int segNo,
                                           java.io.DataInputStream dis)
                                    throws java.io.IOException,
                                           StorageFormatException

Throws:

java.io.IOException

StorageFormatException

Method Detail

onFetchedRelevantBlock

public void onFetchedRelevantBlock(SplitFileFetcherSegmentStorage segment,
                                   int blockNo)

Called when a segment fetches a block that it believes to be relevant to us

addDataBlock

public void addDataBlock(SplitFileFetcherSegmentStorage seg,
                         int blockNum)

isDecoding

public boolean isDecoding()

writeFixedMetadata

public void writeFixedMetadata(java.io.DataOutputStream dos)
                        throws java.io.IOException

Throws:

java.io.IOException

checkBlocks

public void checkBlocks()

Should be called before scheduling, unlike restart(). Doesn't lock, i.e. part of construction. But we must have read metadata on the regular segments first, which won't be true in the constructor.

restart

public void restart()

Check for blocks and try to decode.

cancel

public void cancel()