/**
* Adds a new request to the outstanding requests list. Then send interested if we weren't. Then
* send new requests if not choked. If nothing to request, send not interested if we were.
*
* <p>This is called from several places:
*
* <pre>
* By getOustandingRequest() when the first part of a chunk comes in
* By havePiece() when somebody got a new piece completed
* By chokeMessage() when we receive an unchoke
* By setInteresting() when we are now interested
* By PeerCoordinator.updatePiecePriorities()
* </pre>
*/
synchronized void addRequest() {
// no bitfield yet? nothing to request then.
if (bitfield == null) return;
if (metainfo == null) return;
boolean more_pieces = true;
while (more_pieces) {
more_pieces = outstandingRequests.size() < MAX_PIPELINE;
// We want something and we don't have outstanding requests?
if (more_pieces && lastRequest == null) {
// we have nothing in the queue right now
if (!interesting) {
// If we need something, set interesting but delay pulling
// a request from the PeerCoordinator until unchoked.
if (listener.needPiece(this.peer, bitfield)) {
setInteresting(true);
if (_log.shouldLog(Log.DEBUG))
_log.debug(
peer
+ " addRequest() we need something, setting interesting, delaying requestNextPiece()");
} else {
if (_log.shouldLog(Log.DEBUG)) _log.debug(peer + " addRequest() needs nothing");
}
return;
}
if (choked) {
// If choked, delay pulling
// a request from the PeerCoordinator until unchoked.
if (_log.shouldLog(Log.DEBUG))
_log.debug(peer + " addRequest() we are choked, delaying requestNextPiece()");
return;
}
// huh? rv unused
more_pieces = requestNextPiece();
} else if (more_pieces) // We want something
{
int pieceLength;
boolean isLastChunk;
pieceLength = metainfo.getPieceLength(lastRequest.getPiece());
isLastChunk = lastRequest.off + lastRequest.len == pieceLength;
// Last part of a piece?
if (isLastChunk) more_pieces = requestNextPiece();
else {
PartialPiece nextPiece = lastRequest.getPartialPiece();
int nextBegin = lastRequest.off + PARTSIZE;
int maxLength = pieceLength - nextBegin;
int nextLength = maxLength > PARTSIZE ? PARTSIZE : maxLength;
Request req = new Request(nextPiece, nextBegin, nextLength);
outstandingRequests.add(req);
if (!choked) out.sendRequest(req);
lastRequest = req;
}
}
}
// failsafe
// However this is bad as it thrashes the peer when we change our mind
// Ticket 691 cause here?
if (interesting && lastRequest == null && outstandingRequests.isEmpty()) setInteresting(false);
if (_log.shouldLog(Log.DEBUG)) _log.debug(peer + " requests " + outstandingRequests);
}
