Java Code Examples for org.eclipse.californium.core.network.Exchange#getCurrentResponse()
The following examples show how to use
org.eclipse.californium.core.network.Exchange#getCurrentResponse() .
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Example 1
| Source File: ReliabilityLayer.java From SI with BSD 2-Clause "Simplified" License | 5 votes |
|
/**
* When we receive a duplicate of a request, we stop it here and do not
* forward it to the upper layer. If the server has already sent a response,
* we send it again. If the request has only been acknowledged (but the ACK
* has gone lost or not reached the client yet), we resent the ACK. If the
* request has neither been responded, acknowledged or rejected yet, the
* server has not yet decided what to do with the request and we cannot do
* anything.
*/
@Override
public void receiveRequest(Exchange exchange, Request request) {
if (request.isDuplicate()) {
// Request is a duplicate, so resend ACK, RST or response
if (exchange.getCurrentResponse() != null) {
LOGGER.fine("Respond with the current response to the duplicate request");
// Do not restart retransmission cycle
super.sendResponse(exchange, exchange.getCurrentResponse());
} else if (exchange.getCurrentRequest().isAcknowledged()) {
LOGGER.fine("The duplicate request was acknowledged but no response computed yet. Retransmit ACK");
EmptyMessage ack = EmptyMessage.newACK(request);
sendEmptyMessage(exchange, ack);
} else if (exchange.getCurrentRequest().isRejected()) {
LOGGER.fine("The duplicate request was rejected. Reject again");
EmptyMessage rst = EmptyMessage.newRST(request);
sendEmptyMessage(exchange, rst);
} else {
LOGGER.fine("The server has not yet decided what to do with the request. We ignore the duplicate.");
// The server has not yet decided, whether to acknowledge or
// reject the request. We know for sure that the server has
// received the request though and can drop this duplicate here.
}
} else {
// Request is not a duplicate
exchange.setCurrentRequest(request);
super.receiveRequest(exchange, request);
}
}
Example 2
| Source File: CongestionControlLayer.java From SI with BSD 2-Clause "Simplified" License | 5 votes |
|
private void checkRemoteEndpointQueue(Exchange exchange) {
// 0 = empty queue | 1 = response | 2 = request
if (!getRemoteEndpoint(exchange).getConfirmableQueue().isEmpty()) {
// We have some exchanges that need to be processed; is it a
// response or a request?
Exchange queuedExchange = getRemoteEndpoint(exchange).getConfirmableQueue().poll();
if (queuedExchange.getCurrentResponse() != null) {
// it's a response
sendResponse(queuedExchange, queuedExchange.getCurrentResponse());
} else if (queuedExchange.getCurrentRequest() != null) {
// it's a request
sendRequest(queuedExchange, queuedExchange.getCurrentRequest());
}
}
}
Example 3
| Source File: CongestionControlLayer.java From SI with BSD 2-Clause "Simplified" License | 5 votes |
|
@Override
public void run() {
if (!endpoint.getNonConfirmableQueue().isEmpty()) {
endpoint.setProcessingNON(true);
Exchange exchange = endpoint.getNonConfirmableQueue().poll();
if (getRemoteEndpoint(exchange).getNonConfirmableCounter() <= MAX_SUCCESSIVE_NONS) {
getRemoteEndpoint(exchange).increaseNonConfirmableCounter();
if (exchange.getCurrentRequest().getDestinationPort() != 0) {
// it's a response
sendBucketRequest(exchange, exchange.getCurrentRequest());
} else if (exchange.getCurrentResponse() != null) {
// it's a request
sendBucketResponse(exchange, exchange.getCurrentResponse());
}
}
// schedule next transmission of a NON based on the RTO value (rate = 1/RTO)
executor.schedule(
new bucketThread(getRemoteEndpoint(exchange)),
getRemoteEndpoint(exchange).getRTO(),
TimeUnit.MILLISECONDS);
} else {
endpoint.setProcessingNON(false);
}
}
Example 4
| Source File: ReliabilityLayer.java From SI with BSD 2-Clause "Simplified" License | 5 votes |
|
/**
* When we receive a duplicate of a request, we stop it here and do not
* forward it to the upper layer. If the server has already sent a response,
* we send it again. If the request has only been acknowledged (but the ACK
* has gone lost or not reached the client yet), we resent the ACK. If the
* request has neither been responded, acknowledged or rejected yet, the
* server has not yet decided what to do with the request and we cannot do
* anything.
*/
@Override
public void receiveRequest(Exchange exchange, Request request) {
if (request.isDuplicate()) {
// Request is a duplicate, so resend ACK, RST or response
if (exchange.getCurrentResponse() != null) {
LOGGER.fine("Respond with the current response to the duplicate request");
// Do not restart retransmission cycle
super.sendResponse(exchange, exchange.getCurrentResponse());
} else if (exchange.getCurrentRequest().isAcknowledged()) {
LOGGER.fine("The duplicate request was acknowledged but no response computed yet. Retransmit ACK");
EmptyMessage ack = EmptyMessage.newACK(request);
sendEmptyMessage(exchange, ack);
} else if (exchange.getCurrentRequest().isRejected()) {
LOGGER.fine("The duplicate request was rejected. Reject again");
EmptyMessage rst = EmptyMessage.newRST(request);
sendEmptyMessage(exchange, rst);
} else {
LOGGER.fine("The server has not yet decided what to do with the request. We ignore the duplicate.");
// The server has not yet decided, whether to acknowledge or
// reject the request. We know for sure that the server has
// received the request though and can drop this duplicate here.
}
} else {
// Request is not a duplicate
exchange.setCurrentRequest(request);
super.receiveRequest(exchange, request);
}
}
Example 5
| Source File: CongestionControlLayer.java From SI with BSD 2-Clause "Simplified" License | 5 votes |
|
private void checkRemoteEndpointQueue(Exchange exchange) {
// 0 = empty queue | 1 = response | 2 = request
if (!getRemoteEndpoint(exchange).getConfirmableQueue().isEmpty()) {
// We have some exchanges that need to be processed; is it a
// response or a request?
Exchange queuedExchange = getRemoteEndpoint(exchange).getConfirmableQueue().poll();
if (queuedExchange.getCurrentResponse() != null) {
// it's a response
sendResponse(queuedExchange, queuedExchange.getCurrentResponse());
} else if (queuedExchange.getCurrentRequest() != null) {
// it's a request
sendRequest(queuedExchange, queuedExchange.getCurrentRequest());
}
}
}
Example 6
| Source File: CongestionControlLayer.java From SI with BSD 2-Clause "Simplified" License | 5 votes |
|
@Override
public void run() {
if (!endpoint.getNonConfirmableQueue().isEmpty()) {
endpoint.setProcessingNON(true);
Exchange exchange = endpoint.getNonConfirmableQueue().poll();
if (getRemoteEndpoint(exchange).getNonConfirmableCounter() <= MAX_SUCCESSIVE_NONS) {
getRemoteEndpoint(exchange).increaseNonConfirmableCounter();
if (exchange.getCurrentRequest().getDestinationPort() != 0) {
// it's a response
sendBucketRequest(exchange, exchange.getCurrentRequest());
} else if (exchange.getCurrentResponse() != null) {
// it's a request
sendBucketResponse(exchange, exchange.getCurrentResponse());
}
}
// schedule next transmission of a NON based on the RTO value (rate = 1/RTO)
executor.schedule(
new bucketThread(getRemoteEndpoint(exchange)),
getRemoteEndpoint(exchange).getRTO(),
TimeUnit.MILLISECONDS);
} else {
endpoint.setProcessingNON(false);
}
}
Example 7
| Source File: CongestionControlLayer.java From SI with BSD 2-Clause "Simplified" License | 4 votes |
|
private boolean processMessage(Exchange exchange, Object message) {
Type messageType;
messageType = Type.NON;
// Determine type of message
if (message.getClass() == Request.class) {
messageType = exchange.getCurrentRequest().getType();
}
if (message.getClass() == Response.class) {
messageType = exchange.getCurrentResponse().getType();
}
// Put into queues for NON or CON messages
if (messageType == Type.CON) {
if (!checkNSTART(exchange)) { // Check if NSTART is not reached yet
// for confirmable transmissions
return false;
}
} else if (getRemoteEndpoint(exchange).getNonConfirmableCounter() > MAX_SUCCESSIVE_NONS) {
// Every MAX_SUCCESSIVE_NONS + 1 packets, a non-confirmable needs to
// be converted to a confirmable [CoCoA]
if (exchange.getCurrentRequest().getDestinationPort() != 0) {
exchange.getCurrentRequest().setType(Type.CON);
} else if (exchange.getCurrentResponse() != null) {
exchange.getCurrentResponse().setType(Type.CON);
}
getRemoteEndpoint(exchange).resetNonConfirmableCounter();
// Check if NSTART is not reached yet for confirmable transmissions
if (!checkNSTART(exchange)) {
return false;
}
} else {
// Check of if there's space to queue a NON
if (getRemoteEndpoint(exchange).getNonConfirmableQueue().size() == EXCHANGELIMIT) {
// System.out.println("Non-confirmable exchange queue limit reached!");
// TODO: Drop packet -> Notify upper layers?
} else {
getRemoteEndpoint(exchange).getNonConfirmableQueue().add(
exchange);
// Check if NONs are already processed, if not, start bucket
// Thread
if (!getRemoteEndpoint(exchange).getProcessingNON()) {
executor.schedule(new bucketThread(
getRemoteEndpoint(exchange)), 0,
TimeUnit.MILLISECONDS);
}
}
return false;
}
return true;
}
Example 8
| Source File: CongestionControlLayer.java From SI with BSD 2-Clause "Simplified" License | 4 votes |
|
private boolean processMessage(Exchange exchange, Object message) {
Type messageType;
messageType = Type.NON;
// Determine type of message
if (message.getClass() == Request.class) {
messageType = exchange.getCurrentRequest().getType();
}
if (message.getClass() == Response.class) {
messageType = exchange.getCurrentResponse().getType();
}
// Put into queues for NON or CON messages
if (messageType == Type.CON) {
if (!checkNSTART(exchange)) { // Check if NSTART is not reached yet
// for confirmable transmissions
return false;
}
} else if (getRemoteEndpoint(exchange).getNonConfirmableCounter() > MAX_SUCCESSIVE_NONS) {
// Every MAX_SUCCESSIVE_NONS + 1 packets, a non-confirmable needs to
// be converted to a confirmable [CoCoA]
if (exchange.getCurrentRequest().getDestinationPort() != 0) {
exchange.getCurrentRequest().setType(Type.CON);
} else if (exchange.getCurrentResponse() != null) {
exchange.getCurrentResponse().setType(Type.CON);
}
getRemoteEndpoint(exchange).resetNonConfirmableCounter();
// Check if NSTART is not reached yet for confirmable transmissions
if (!checkNSTART(exchange)) {
return false;
}
} else {
// Check of if there's space to queue a NON
if (getRemoteEndpoint(exchange).getNonConfirmableQueue().size() == EXCHANGELIMIT) {
// System.out.println("Non-confirmable exchange queue limit reached!");
// TODO: Drop packet -> Notify upper layers?
} else {
getRemoteEndpoint(exchange).getNonConfirmableQueue().add(
exchange);
// Check if NONs are already processed, if not, start bucket
// Thread
if (!getRemoteEndpoint(exchange).getProcessingNON()) {
executor.schedule(new bucketThread(
getRemoteEndpoint(exchange)), 0,
TimeUnit.MILLISECONDS);
}
}
return false;
}
return true;
}
