/*
* (non-Javadoc)
*
* @see org.eclipse.linuxtools.tmf.trace.ITmfTrace#seekEvent(org.eclipse.linuxtools .tmf.event.TmfTimestamp)
*/
@Override
public synchronized TmfExperimentContext seekEvent(TmfTimestamp timestamp) {
// Tracer.trace("Ctx: seekEvent(TS) - start");
if (timestamp == null) {
timestamp = TmfTimestamp.BigBang;
}
// First, find the right checkpoint
int index = Collections.binarySearch(fCheckpoints, new TmfCheckpoint(timestamp, null));
// In the very likely case that the checkpoint was not found, bsearch
// returns its negated would-be location (not an offset...). From that
// index, we can then position the stream and get the event.
if (index < 0) {
index = Math.max(0, -(index + 2));
}
// Position the experiment at the checkpoint
ITmfLocation<?> location;
synchronized (fCheckpoints) {
if (fCheckpoints.size() > 0) {
if (index >= fCheckpoints.size()) {
index = fCheckpoints.size() - 1;
}
location = fCheckpoints.elementAt(index).getLocation();
} else {
location = null;
}
}
TmfExperimentContext context = seekLocation(location);
context.setRank((long) index * fIndexPageSize);
// And locate the event
TmfEvent event = parseEvent(context);
while (event != null && event.getTimestamp().compareTo(timestamp, false) < 0) {
getNextEvent(context);
event = parseEvent(context);
}
if (event == null) {
context.setLocation(null);
context.setRank(ITmfContext.UNKNOWN_RANK);
}
return context;
}
// 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;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.linuxtools.tmf.trace.ITmfTrace#seekEvent(long)
*/
@Override
public synchronized TmfExperimentContext seekEvent(long rank) {
// Tracer.trace("Ctx: seekEvent(rank) - start");
// Position the stream at the previous checkpoint
int index = (int) rank / fIndexPageSize;
ITmfLocation<?> location;
synchronized (fCheckpoints) {
if (fCheckpoints.size() == 0) {
location = null;
} else {
if (index >= fCheckpoints.size()) {
index = fCheckpoints.size() - 1;
}
location = fCheckpoints.elementAt(index).getLocation();
}
}
TmfExperimentContext context = seekLocation(location);
context.setRank((long) index * fIndexPageSize);
// And locate the event
TmfEvent event = parseEvent(context);
long pos = context.getRank();
while (event != null && pos++ < rank) {
getNextEvent(context);
event = parseEvent(context);
}
if (event == null) {
context.setLocation(null);
context.setRank(ITmfContext.UNKNOWN_RANK);
}
return context;
}
