/**
* This produces iterators of Cursor objects that must be fully processed (until isDone()
* returns true) before the next Cursor is processed. It is *not* safe to pass these cursors off
* to another thread for parallel processing
*
* @return
*/
@Override
public Iterator<Cursor> iterator() {
final Map<String, Object> metricCacheMap = Maps.newHashMap();
final IndexedLongs timestamps = index.getReadOnlyTimestamps();
final FunctionalIterator<Cursor> retVal =
FunctionalIterator.create(
gran.iterable(interval.getStartMillis(), interval.getEndMillis()).iterator())
.transform(
new Function<Long, Cursor>() {
private int currRow = 0;
@Override
public Cursor apply(final Long input) {
final long timeStart = Math.max(interval.getStartMillis(), input);
while (currRow < timestamps.size() && timestamps.get(currRow) < timeStart) {
++currRow;
}
return new Cursor() {
private final DateTime myBucket = gran.toDateTime(input);
private final long nextBucket =
Math.min(gran.next(myBucket.getMillis()), interval.getEndMillis());
private final int initRow = currRow;
@Override
public DateTime getTime() {
return myBucket;
}
@Override
public void advance() {
++currRow;
}
@Override
public boolean isDone() {
return currRow >= timestamps.size()
|| timestamps.get(currRow) >= nextBucket;
}
@Override
public void reset() {
currRow = initRow;
}
@Override
public DimensionSelector makeDimensionSelector(final String dimensionName) {
final Indexed<? extends IndexedInts> rowVals =
index.getDimColumn(dimensionName);
final Indexed<String> dimValueLookup =
index.getDimValueLookup(dimensionName);
if (rowVals == null) {
return null;
}
return new DimensionSelector() {
@Override
public IndexedInts getRow() {
return rowVals.get(currRow);
}
@Override
public int getValueCardinality() {
return dimValueLookup.size();
}
@Override
public String lookupName(int id) {
final String retVal = dimValueLookup.get(id);
return retVal == null ? "" : retVal;
}
@Override
public int lookupId(String name) {
return ("".equals(name))
? dimValueLookup.indexOf(null)
: dimValueLookup.indexOf(name);
}
};
}
@Override
public FloatMetricSelector makeFloatMetricSelector(String metricName) {
IndexedFloats cachedMetricVals =
(IndexedFloats) metricCacheMap.get(metricName);
if (cachedMetricVals == null) {
final MetricHolder metricHolder = index.getMetricHolder(metricName);
if (metricHolder != null) {
cachedMetricVals = metricHolder.getFloatType();
if (cachedMetricVals != null) {
metricCacheMap.put(metricName, cachedMetricVals);
}
}
}
if (cachedMetricVals == null) {
return new FloatMetricSelector() {
@Override
public float get() {
return 0.0f;
}
};
}
final IndexedFloats metricVals = cachedMetricVals;
return new FloatMetricSelector() {
@Override
public float get() {
return metricVals.get(currRow);
}
};
}
@Override
public ComplexMetricSelector makeComplexMetricSelector(String metricName) {
Indexed cachedMetricVals = (Indexed) metricCacheMap.get(metricName);
if (cachedMetricVals == null) {
final MetricHolder metricHolder = index.getMetricHolder(metricName);
if (metricHolder != null) {
cachedMetricVals = metricHolder.getComplexType();
if (cachedMetricVals != null) {
metricCacheMap.put(metricName, cachedMetricVals);
}
}
}
if (cachedMetricVals == null) {
return null;
}
final Indexed metricVals = cachedMetricVals;
return new ComplexMetricSelector() {
@Override
public Class classOfObject() {
return metricVals.getClazz();
}
@Override
public Object get() {
return metricVals.get(currRow);
}
};
}
};
}
});
return MoreIterators.after(
retVal,
new Runnable() {
@Override
public void run() {
Closeables.closeQuietly(timestamps);
for (Object object : metricCacheMap.values()) {
if (object instanceof Closeable) {
Closeables.closeQuietly((Closeable) object);
}
}
}
});
}
@Override
public Iterator<Cursor> iterator() {
final Offset baseOffset = offset.clone();
final Map<String, Object> metricHolderCache = Maps.newHashMap();
final IndexedLongs timestamps = index.getReadOnlyTimestamps();
final FunctionalIterator<Cursor> retVal =
FunctionalIterator.create(
gran.iterable(interval.getStartMillis(), interval.getEndMillis()).iterator())
.transform(
new Function<Long, Cursor>() {
@Override
public Cursor apply(final Long input) {
final long timeStart = Math.max(interval.getStartMillis(), input);
while (baseOffset.withinBounds()
&& timestamps.get(baseOffset.getOffset()) < timeStart) {
baseOffset.increment();
}
final Offset offset =
new TimestampCheckingOffset(
baseOffset,
timestamps,
Math.min(interval.getEndMillis(), gran.next(timeStart)));
return new Cursor() {
private final Offset initOffset = offset.clone();
private final DateTime myBucket = gran.toDateTime(input);
private Offset cursorOffset = offset;
@Override
public DateTime getTime() {
return myBucket;
}
@Override
public void advance() {
cursorOffset.increment();
}
@Override
public boolean isDone() {
return !cursorOffset.withinBounds();
}
@Override
public void reset() {
cursorOffset = initOffset.clone();
}
@Override
public DimensionSelector makeDimensionSelector(final String dimensionName) {
final Indexed<? extends IndexedInts> rowVals =
index.getDimColumn(dimensionName);
final Indexed<String> dimValueLookup =
index.getDimValueLookup(dimensionName);
if (rowVals == null) {
return null;
}
return new DimensionSelector() {
@Override
public IndexedInts getRow() {
return rowVals.get(cursorOffset.getOffset());
}
@Override
public int getValueCardinality() {
return dimValueLookup.size();
}
@Override
public String lookupName(int id) {
final String retVal = dimValueLookup.get(id);
return retVal == null ? "" : retVal;
}
@Override
public int lookupId(String name) {
return ("".equals(name))
? dimValueLookup.indexOf(null)
: dimValueLookup.indexOf(name);
}
};
}
@Override
public FloatMetricSelector makeFloatMetricSelector(String metricName) {
IndexedFloats cachedMetricVals =
(IndexedFloats) metricHolderCache.get(metricName);
if (cachedMetricVals == null) {
MetricHolder holder = index.getMetricHolder(metricName);
if (holder != null) {
cachedMetricVals = holder.getFloatType();
metricHolderCache.put(metricName, cachedMetricVals);
}
}
if (cachedMetricVals == null) {
return new FloatMetricSelector() {
@Override
public float get() {
return 0.0f;
}
};
}
final IndexedFloats metricVals = cachedMetricVals;
return new FloatMetricSelector() {
@Override
public float get() {
return metricVals.get(cursorOffset.getOffset());
}
};
}
@Override
public ComplexMetricSelector makeComplexMetricSelector(String metricName) {
Indexed cachedMetricVals = (Indexed) metricHolderCache.get(metricName);
if (cachedMetricVals == null) {
MetricHolder holder = index.getMetricHolder(metricName);
if (holder != null) {
cachedMetricVals = holder.getComplexType();
metricHolderCache.put(metricName, cachedMetricVals);
}
}
if (cachedMetricVals == null) {
return null;
}
final Indexed metricVals = cachedMetricVals;
return new ComplexMetricSelector() {
@Override
public Class classOfObject() {
return metricVals.getClazz();
}
@Override
public Object get() {
return metricVals.get(cursorOffset.getOffset());
}
};
}
};
}
});
// This after call is not perfect, if there is an exception during processing, it will never
// get called,
// but it's better than nothing and doing this properly all the time requires a lot more
// fixerating
return MoreIterators.after(
retVal,
new Runnable() {
@Override
public void run() {
Closeables.closeQuietly(timestamps);
for (Object object : metricHolderCache.values()) {
if (object instanceof Closeable) {
Closeables.closeQuietly((Closeable) object);
}
}
}
});
}
