/**
* Returns true if the specified notification is newer than the current one.
*
* @param response the notification
* @return true if the notification is new
*/
public synchronized boolean isNew(Response response) {
if (!response.getOptions().hasObserve()) {
// this is a final response, e.g., error or proactive cancellation
return true;
}
// Multiple responses with different notification numbers might
// arrive and be processed by different threads. We have to
// ensure that only the most fresh one is being delivered.
// We use the notation from the observe draft-08.
long T1 = getTimestamp();
long T2 = System.currentTimeMillis();
int V1 = getCurrent();
int V2 = response.getOptions().getObserve();
int notifMaxAge =
NetworkConfig.getStandard().getInt(NetworkConfigDefaults.NOTIFICATION_MAX_AGE);
if (V1 < V2 && V2 - V1 < 1 << 23 || V1 > V2 && V1 - V2 > 1 << 23 || T2 > T1 + notifMaxAge) {
setTimestamp(T2);
number.set(V2);
return true;
} else {
return false;
}
}
@Override
public void handleGET(CoapExchange exchange) {
String payload =
"Available commands:\n - GET: show statistics\n - POST write stats to file\n - DELETE: reset statistics\n\n";
payload += getStatString();
Response response = new Response(ResponseCode.CONTENT);
response.setPayload(payload);
response.getOptions().setContentFormat(MediaTypeRegistry.TEXT_PLAIN);
exchange.respond(response);
}
@Override
public void handlePOST(CoapExchange exchange) {
String payload = exchange.getRequestText();
String[] parts = payload.split("\\?");
String[] path = parts[0].split("/");
Resource resource = create(new LinkedList<String>(Arrays.asList(path)));
Response response = new Response(ResponseCode.CREATED);
response.getOptions().setLocationPath(resource.getURI());
exchange.respond(response);
}
@Override
public void handlePOST(CoapExchange exchange) {
// TODO include stopping the writing => make something for the whole
// proxy
// executor.shutdown();
// request.respond(CodeRegistry.RESP_DELETED, "Stopped",
// MediaTypeRegistry.TEXT_PLAIN);
// starting to log the stats on a new file
// create the new file
String logName = System.nanoTime() + CACHE_LOG_NAME;
final File cacheLog = new File(logName);
try {
cacheLog.createNewFile();
// write the header
com.google.common.io.Files.write(
"hits%, avg. load, #evictions \n", cacheLog, Charset.defaultCharset());
} catch (IOException e) {
}
executor.scheduleWithFixedDelay(
new Runnable() {
@Override
public void run() {
CacheStats cacheStats = cacheResource.getCacheStats().minus(relativeCacheStats);
String csvStats =
String.format(
"%.3f, %.3f, %d %n",
cacheStats.hitRate(),
cacheStats.averageLoadPenalty(),
cacheStats.evictionCount());
try {
com.google.common.io.Files.append(csvStats, cacheLog, Charset.defaultCharset());
} catch (IOException e) {
}
}
},
0,
DEFAULT_LOGGING_DELAY,
TimeUnit.SECONDS);
Response response = new Response(ResponseCode.CREATED);
response.setPayload("Creted log: " + logName);
response.getOptions().setContentFormat(MediaTypeRegistry.TEXT_PLAIN);
exchange.respond(response);
}
/**
* This method is used to apply resource-specific knowledge on the exchange. If the request was
* successful, it sets the Observe option for the response. It is important to use the
* notificationOrderer of the resource here. Further down the layer, race conditions could cause
* local reordering of notifications. If the response has an error code, no observe relation can
* be established and if there was one previously it is canceled. When this resource allows to be
* observed by clients and the request is a GET request with an observe option, the {@link
* ServerMessageDeliverer} already created the relation, as it manages the observing endpoints
* globally.
*
* @param exchange the exchange
* @param response the response
*/
public void checkObserveRelation(Exchange exchange, Response response) {
/*
* If the request for the specified exchange tries to establish an observer
* relation, then the ServerMessageDeliverer must have created such a relation
* and added to the exchange. Otherwise, there is no such relation.
* Remember that different paths might lead to this resource.
*/
ObserveRelation relation = exchange.getRelation();
if (relation == null) return; // because request did not try to establish a relation
if (CoAP.ResponseCode.isSuccess(response.getCode())) {
response.getOptions().setObserve(notificationOrderer.getCurrent());
if (!relation.isEstablished()) {
relation.setEstablished(true);
addObserveRelation(relation);
} else if (observeType != null) {
// The resource can control the message type of the notification
response.setType(observeType);
}
} // ObserveLayer takes care of the else case
}
/**
* Gets the set of options of this response.
*
* @return the options
*/
public OptionSet getOptions() {
return response.getOptions();
}
@Override
protected synchronized void executeRequest(
Request request, String serverURI, String resourceUri) {
// defensive check for slash
if (!serverURI.endsWith("/") && !resourceUri.startsWith("/")) {
resourceUri = "/" + resourceUri;
}
URI uri = null;
try {
uri = new URI(serverURI + resourceUri);
} catch (URISyntaxException use) {
throw new IllegalArgumentException("Invalid URI: " + use.getMessage());
}
request.setURI(uri);
// for observing
int observeLoop = 2;
// print request info
if (verbose) {
System.out.println("Request for test " + this.testName + " sent");
Utils.prettyPrint(request);
}
// execute the request
try {
Response response = null;
boolean success = true;
long time = 5000;
request.send();
System.out.println();
System.out.println("**** TEST: " + testName + " ****");
System.out.println("**** BEGIN CHECK ****");
response = request.waitForResponse(time);
if (response != null) {
success &= checkType(Type.ACK, response.getType());
success &= checkInt(EXPECTED_RESPONSE_CODE.value, response.getCode().value, "code");
success &= checkToken(request.getToken(), response.getToken());
success &= hasContentType(response);
success &= hasNonEmptyPalyoad(response);
success &= hasObserve(response);
if (success) {
time = response.getOptions().getMaxAge() * 1000;
System.out.println("+++++ Max-Age: " + time + " +++++");
if (time == 0) time = 5000;
for (int l = 0; success && (l < observeLoop); ++l) {
response = request.waitForResponse(time + 1000);
// checking the response
if (response != null) {
System.out.println("Received notification " + l);
// print response info
if (verbose) {
System.out.println("Response received");
System.out.println("Time elapsed (ms): " + response.getRTT());
Utils.prettyPrint(response);
}
success &= checkResponse(request, response);
} else {
System.out.println("FAIL: Notifications stopped");
success = false;
break;
} // response != null
} // observeLoop
if (response != null) {
System.out.println("+++++++ Canceling +++++++");
request.cancel(); // stack should send RST
Thread.sleep(time + time / 2);
} else {
System.out.println("FAIL: Notifications stopped");
success = false;
}
}
} else {
System.out.println("FAIL: No notification after registration");
success = false;
}
if (success) {
System.out.println("**** TEST PASSED ****");
addSummaryEntry(testName + ": PASSED (conditionally)");
} else {
System.out.println("**** TEST FAILED ****");
addSummaryEntry(testName + ": --FAILED--");
}
tickOffTest();
} catch (InterruptedException e) {
System.err.println("Interupted during receive: " + e.getMessage());
System.exit(-1);
}
}