/*
* (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;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.linuxtools.tmf.trace.ITmfTrace#parseEvent(org.eclipse.linuxtools .tmf.trace.TmfContext)
*/
@Override
public TmfEvent parseEvent(TmfContext context) {
// Validate the context
if (!(context instanceof TmfExperimentContext)) {
return null; // Throw an exception?
}
if (!context.equals(fExperimentContext)) {
// Tracer.trace("Ctx: Restoring context");
seekLocation(context.getLocation());
}
TmfExperimentContext expContext = (TmfExperimentContext) context;
// 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);
fExperimentContext = (TmfExperimentContext) context;
}
// Scan the candidate events and identify the "next" trace to read from
int trace = TmfExperimentContext.NO_TRACE;
TmfTimestamp timestamp = TmfTimestamp.BigCrunch;
for (int i = 0; i < expContext.getTraces().length; i++) {
TmfEvent event = expContext.getEvents()[i];
if (event != null && event.getTimestamp() != null) {
TmfTimestamp otherTS = event.getTimestamp();
if (otherTS.compareTo(timestamp, true) < 0) {
trace = i;
timestamp = otherTS;
}
}
}
TmfEvent event = null;
if (trace != TmfExperimentContext.NO_TRACE) {
event = expContext.getEvents()[trace];
}
return event;
}
@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;
}
/**
* Returns the timestamp of the event at the requested index. If none, returns null.
*
* @param index
* @return
*/
public TmfTimestamp getTimestamp(int index) {
TmfExperimentContext context = seekEvent(index);
TmfEvent event = getNextEvent(context);
return (event != null) ? event.getTimestamp() : null;
}
