// Returns a brand new context based on the location provided
// and initializes the event queues
@Override
public synchronized TmfExperimentContext seekLocation(ITmfLocation<?> location) {
// Validate the location
if (location != null && !(location instanceof TmfExperimentLocation)) {
return null; // Throw an exception?
}
if (fTraces == null) { // experiment has been disposed
return null;
}
// Instantiate the location
TmfExperimentLocation expLocation =
(location == null)
? new TmfExperimentLocation(
new TmfLocationArray(new ITmfLocation<?>[fTraces.length]), new long[fTraces.length])
: (TmfExperimentLocation) location.clone();
// Create and populate the context's traces contexts
TmfExperimentContext context =
new TmfExperimentContext(fTraces, new TmfContext[fTraces.length]);
// Tracer.trace("Ctx: SeekLocation - start");
long rank = 0;
for (int i = 0; i < fTraces.length; i++) {
// Get the relevant trace attributes
ITmfLocation<?> traceLocation = expLocation.getLocation().locations[i];
long traceRank = expLocation.getRanks()[i];
// Set the corresponding sub-context
context.getContexts()[i] = fTraces[i].seekLocation(traceLocation);
context.getContexts()[i].setRank(traceRank);
rank += traceRank;
// Set the trace location and read the corresponding event
expLocation.getLocation().locations[i] = context.getContexts()[i].getLocation();
context.getEvents()[i] = fTraces[i].getNextEvent(context.getContexts()[i]);
}
// Tracer.trace("Ctx: SeekLocation - done");
// Finalize context
context.setLocation(expLocation);
context.setLastTrace(TmfExperimentContext.NO_TRACE);
context.setRank(rank);
fExperimentContext = context;
return context;
}
@Override
public synchronized TmfEvent getNextEvent(TmfContext context) {
// Validate the context
if (!(context instanceof TmfExperimentContext)) {
return null; // Throw an exception?
}
if (!context.equals(fExperimentContext)) {
// Tracer.trace("Ctx: Restoring context");
fExperimentContext = seekLocation(context.getLocation());
}
TmfExperimentContext expContext = (TmfExperimentContext) context;
// dumpContext(expContext, true);
// If an event was consumed previously, get the next one from that trace
int lastTrace = expContext.getLastTrace();
if (lastTrace != TmfExperimentContext.NO_TRACE) {
TmfContext traceContext = expContext.getContexts()[lastTrace];
expContext.getEvents()[lastTrace] =
expContext.getTraces()[lastTrace].getNextEvent(traceContext);
expContext.setLastTrace(TmfExperimentContext.NO_TRACE);
}
// Scan the candidate events and identify the "next" trace to read from
TmfEvent eventArray[] = expContext.getEvents();
if (eventArray == null) {
return null;
}
int trace = TmfExperimentContext.NO_TRACE;
TmfTimestamp timestamp = TmfTimestamp.BigCrunch;
if (eventArray.length == 1) {
if (eventArray[0] != null) {
timestamp = eventArray[0].getTimestamp();
trace = 0;
}
} else {
for (int i = 0; i < eventArray.length; i++) {
TmfEvent event = eventArray[i];
if (event != null && event.getTimestamp() != null) {
TmfTimestamp otherTS = event.getTimestamp();
if (otherTS.compareTo(timestamp, true) < 0) {
trace = i;
timestamp = otherTS;
}
}
}
}
// Update the experiment context and set the "next" event
TmfEvent event = null;
if (trace != TmfExperimentContext.NO_TRACE) {
updateIndex(expContext, timestamp);
TmfContext traceContext = expContext.getContexts()[trace];
TmfExperimentLocation expLocation = (TmfExperimentLocation) expContext.getLocation();
// expLocation.getLocation()[trace] = traceContext.getLocation().clone();
expLocation.getLocation().locations[trace] = traceContext.getLocation();
// updateIndex(expContext, timestamp);
expLocation.getRanks()[trace] = traceContext.getRank();
expContext.setLastTrace(trace);
expContext.updateRank(1);
event = expContext.getEvents()[trace];
fExperimentContext = expContext;
}
// if (event != null) {
// Tracer.trace("Exp: " + (expContext.getRank() - 1) + ": " +
// event.getTimestamp().toString());
// dumpContext(expContext, false);
// Tracer.trace("Ctx: Event returned= " + event.getTimestamp().toString());
// }
return event;
}