From 1bc83891c68ee269727e81a13cc70da698bcc7a7 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 2 Jun 2015 19:53:31 +0200
Subject: [server] Compiling again, still lots of stubs

---
 .../src/main/java/fileserv/ChunkList.java          | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 dozentenmodulserver/src/main/java/fileserv/ChunkList.java

(limited to 'dozentenmodulserver/src/main/java/fileserv/ChunkList.java')

diff --git a/dozentenmodulserver/src/main/java/fileserv/ChunkList.java b/dozentenmodulserver/src/main/java/fileserv/ChunkList.java
new file mode 100644
index 00000000..95b3e1fa
--- /dev/null
+++ b/dozentenmodulserver/src/main/java/fileserv/ChunkList.java
@@ -0,0 +1,78 @@
+package fileserv;
+
+import java.nio.ByteBuffer;
+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<>();
+
+	// 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);
+	}
+
+	/**
+	 * 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;
+	}
+
+	/**
+	 * 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;
+		}
+	}
+
+	/**
+	 * 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();
+	}
+
+}
-- 
cgit v1.2.3-55-g7522