/** @since 2.0 */
@Override
public synchronized ITmfContext seekEvent(final ITmfTimestamp timestamp) {
// A null timestamp indicates to seek the first event
if (timestamp == null) {
ITmfContext context = seekEvent((ITmfLocation) null);
context.setRank(0);
return context;
}
// Position the trace at the checkpoint
ITmfContext context = fIndexer.seekIndex(timestamp);
// And locate the requested event context
ITmfLocation previousLocation = context.getLocation();
long previousRank = context.getRank();
ITmfEvent event = getNext(context);
while (event != null && event.getTimestamp().compareTo(timestamp, false) < 0) {
previousLocation = context.getLocation();
previousRank = context.getRank();
event = getNext(context);
}
if (event == null) {
context.setLocation(null);
context.setRank(ITmfContext.UNKNOWN_RANK);
} else {
context.dispose();
context = seekEvent(previousLocation);
context.setRank(previousRank);
}
return context;
}
@Override
public synchronized ITmfEvent getNext(final ITmfContext context) {
// parseEvent() does not update the context
final ITmfEvent event = fParser.parseEvent(context);
if (event != null) {
updateAttributes(context, event.getTimestamp());
context.setLocation(getCurrentLocation());
context.increaseRank();
processEvent(event);
}
return event;
}
@Override
public synchronized ITmfEvent getNext(ITmfContext context) {
// Validate the context
if (!(context instanceof TmfExperimentContext)) {
return null; // Throw an exception?
}
// Make sure that we have something to read from
if (fTraces == null) {
return null;
}
TmfExperimentContext expContext = (TmfExperimentContext) context;
// If an event was consumed previously, first get the next one from that
// trace
final int lastTrace = expContext.getLastTrace();
if (lastTrace != TmfExperimentContext.NO_TRACE) {
final ITmfContext traceContext = expContext.getContext(lastTrace);
expContext.setEvent(lastTrace, fTraces[lastTrace].getNext(traceContext));
expContext.setLastTrace(TmfExperimentContext.NO_TRACE);
}
// Scan the candidate events and identify the "next" trace to read from
int trace = TmfExperimentContext.NO_TRACE;
ITmfTimestamp timestamp = TmfTimestamp.BIG_CRUNCH;
for (int i = 0; i < fTraces.length; i++) {
final ITmfEvent event = expContext.getEvent(i);
if (event != null && event.getTimestamp() != null) {
final ITmfTimestamp otherTS = event.getTimestamp();
if (otherTS.compareTo(timestamp, true) < 0) {
trace = i;
timestamp = otherTS;
}
}
}
ITmfEvent event = null;
if (trace != TmfExperimentContext.NO_TRACE) {
event = expContext.getEvent(trace);
if (event != null) {
updateAttributes(expContext, event.getTimestamp());
expContext.increaseRank();
expContext.setLastTrace(trace);
final ITmfContext traceContext = expContext.getContext(trace);
if (traceContext == null) {
throw new IllegalStateException();
}
// Update the experiment location
TmfLocationArray locationArray =
new TmfLocationArray(
((TmfExperimentLocation) expContext.getLocation()).getLocationInfo(),
trace,
traceContext.getLocation(),
traceContext.getRank());
expContext.setLocation(new TmfExperimentLocation(locationArray));
processEvent(event);
}
}
return event;
}
private synchronized void initializeStreamingMonitor() {
if (fInitialized) {
return;
}
fInitialized = true;
if (getStreamingInterval() == 0) {
final ITmfContext context = seekEvent(0);
final ITmfEvent event = getNext(context);
context.dispose();
if (event == null) {
return;
}
final TmfTimeRange timeRange =
new TmfTimeRange(event.getTimestamp(), TmfTimestamp.BIG_CRUNCH);
final TmfTraceRangeUpdatedSignal signal =
new TmfTraceRangeUpdatedSignal(this, this, timeRange);
// Broadcast in separate thread to prevent deadlock
new Thread() {
@Override
public void run() {
broadcast(signal);
}
}.start();
return;
}
final Thread thread =
new Thread("Streaming Monitor for experiment " + getName()) { // $NON-NLS-1$
private ITmfTimestamp safeTimestamp = null;
private ITmfTimestamp lastSafeTimestamp = null;
private TmfTimeRange timeRange = null;
@Override
public void run() {
while (!executorIsShutdown()) {
if (!getIndexer().isIndexing()) {
ITmfTimestamp startTimestamp = TmfTimestamp.BIG_CRUNCH;
ITmfTimestamp endTimestamp = TmfTimestamp.BIG_BANG;
for (final ITmfTrace trace : fTraces) {
if (trace.getStartTime().compareTo(startTimestamp) < 0) {
startTimestamp = trace.getStartTime();
}
if (trace.getStreamingInterval() != 0
&& trace.getEndTime().compareTo(endTimestamp) > 0) {
endTimestamp = trace.getEndTime();
}
}
if (safeTimestamp != null
&& (lastSafeTimestamp == null
|| safeTimestamp.compareTo(lastSafeTimestamp, false) > 0)) {
timeRange = new TmfTimeRange(startTimestamp, safeTimestamp);
lastSafeTimestamp = safeTimestamp;
} else {
timeRange = null;
}
safeTimestamp = endTimestamp;
if (timeRange != null) {
final TmfTraceRangeUpdatedSignal signal =
new TmfTraceRangeUpdatedSignal(
TmfExperiment.this, TmfExperiment.this, timeRange);
broadcast(signal);
}
}
try {
Thread.sleep(getStreamingInterval());
} catch (final InterruptedException e) {
e.printStackTrace();
}
}
}
};
thread.start();
}
/**
* Returns the timestamp of the event at the requested index. If none, returns null.
*
* @param index the event index (rank)
* @return the corresponding event timestamp
* @since 2.0
*/
public ITmfTimestamp getTimestamp(final int index) {
final ITmfContext context = seekEvent(index);
final ITmfEvent event = getNext(context);
context.dispose();
return (event != null) ? event.getTimestamp() : null;
}