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package org.openslx.filetransfer.util;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import org.apache.log4j.Logger;
public class ChunkList {
private static final Logger LOGGER = Logger.getLogger(ChunkList.class);
/**
* Chunks that are missing from the file
*/
private final List<FileChunk> missingChunks = new LinkedList<>();
/**
* Chunks that are currently being uploaded or hash-checked
*/
private final List<FileChunk> pendingChunks = new LinkedList<>();
private final List<FileChunk> completeChunks = new ArrayList<>(100);
// 0 = complete, 1 = missing, 2 = uploading, 3 = queued for copying, 4 = copying
private final ByteBuffer statusArray;
// Do we need to keep valid chunks, or chunks that failed too many times?
public ChunkList(long fileSize, List<ByteBuffer> sha1Sums) {
FileChunk.createChunkList(missingChunks, fileSize, sha1Sums);
statusArray = ByteBuffer.allocate(missingChunks.size());
}
/**
* Get a missing chunk, marking it pending.
*
* @return chunk marked as missing
*/
public synchronized FileChunk getMissing() {
if (missingChunks.isEmpty())
return null;
FileChunk c = missingChunks.remove(0);
pendingChunks.add(c);
return c;
}
/**
* Get the block status as byte representation.
*/
public synchronized ByteBuffer getStatusArray() {
byte[] array = statusArray.array();
//Arrays.fill(array, (byte)0);
for (FileChunk c : missingChunks) {
array[c.getChunkIndex()] = 1;
}
for (FileChunk c : pendingChunks) {
array[c.getChunkIndex()] = 2;
}
for (FileChunk c : completeChunks) {
array[c.getChunkIndex()] = 0;
}
return statusArray;
}
/**
* Get completed chunks as list
*
* @return List containing all successfully transfered chunks
*/
public synchronized List<FileChunk> getCompleted() {
return new ArrayList<>(completeChunks);
}
/**
* Mark a chunk currently transferring as successfully transfered.
*
* @param c The chunk in question
*/
public synchronized void markSuccessful(FileChunk c) {
if (!pendingChunks.remove(c)) {
LOGGER.warn("Inconsistent state: markTransferred called for Chunk " + c.toString()
+ ", but chunk is not marked as currently transferring!");
return;
}
completeChunks.add(c);
}
/**
* Mark a chunk currently transferring or being hash checked as failed
* transfer. This increases its fail count and re-adds it to the list of
* missing chunks.
*
* @param c The chunk in question
* @return Number of times transfer of this chunk failed
*/
public synchronized int markFailed(FileChunk c) {
if (!pendingChunks.remove(c)) {
LOGGER.warn("Inconsistent state: markTransferred called for Chunk " + c.toString()
+ ", but chunk is not marked as currently transferring!");
return -1;
}
// Add as first element so it will be re-transmitted immediately
missingChunks.add(0, c);
return c.incFailed();
}
public synchronized boolean isComplete() {
return missingChunks.isEmpty() && pendingChunks.isEmpty();
}
}
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