private void assertFurtherValuesSorting(final FDate key) {
final FDate firstKey = extractKey(key, furtherValues.getHead());
if (firstKey.compareTo(key) <= -1) {
/*
* readAllValuesAscendingFrom loads all data, thus we set the min key very deep so that later queries are
* skipped if they are before minKey
*/
minKey = minKey();
}
if (minKeyInDB == null || firstKey.compareTo(minKey) <= -1) {
minKeyInDB = firstKey;
}
minKeyInDBFromLoadFurtherValues = FDates.min(minKeyInDBFromLoadFurtherValues, firstKey);
final FDate lastKey = extractKey(key, furtherValues.getTail());
if (maxKeyInDB == null || lastKey.compareTo(maxKeyInDB) <= -1) {
maxKeyInDB = FDates.max(maxKeyInDB, lastKey);
}
maxKeyInDBFromLoadFurtherValues = FDates.max(maxKeyInDBFromLoadFurtherValues, lastKey);
if (furtherValues.size() > 1) {
Assertions.checkState(
firstKey.compareTo(lastKey) <= 0,
"Not ascending sorted! At firstKey [%s] and lastKey [%s]",
firstKey,
lastKey);
}
}
private boolean eventuallyLoadFurtherValues(
final String source,
final FDate key,
final FDate adjustedKey,
final boolean newMinKey,
final boolean forced) {
if (forced || shouldLoadFurtherValues(key, newMinKey)) {
final FDate keyForReadAllValues;
if (newMinKey
&& minKeyInDBFromLoadFurtherValues != null
&& key.isBefore(minKeyInDBFromLoadFurtherValues)) {
// performance optimization for first load
keyForReadAllValues = FDates.min(minKeyInDB, FDates.max(minKeyInDB, adjustedKey));
} else {
keyForReadAllValues = FDates.max(minKeyInDB, adjustedKey);
}
furtherValues.clear();
lastValuesFromFurtherValues.clear();
furtherValues.addAll(readAllValuesAscendingFrom(keyForReadAllValues));
if (!furtherValues.isEmpty()) {
assertFurtherValuesSorting(key);
}
return true;
}
return false;
}
private V searchInFurtherValues(final FDate key) {
// Take the first matching value from the sorted list
// Search for the newest value
V prevValue = (V) null;
FDate prevKey = null;
if (!lastValuesFromFurtherValues.isEmpty()) {
// though maybe use the last one for smaller increments than the data itself is loaded
for (final V lastValueFromFurtherValues : lastValuesFromFurtherValues) {
final FDate keyLastValueFromFurtherValues = extractKey(key, lastValueFromFurtherValues);
if (keyLastValueFromFurtherValues.isBeforeOrEqualTo(key)) {
prevValue = lastValueFromFurtherValues;
prevKey = keyLastValueFromFurtherValues;
} else {
// only go to further values if it might be possible that those are useable
return prevValue;
}
}
}
final FDate earliestStartOfLoadFurtherValues = determineEaliestStartOfLoadFurtherValues(key);
while (furtherValues.size() > 0) {
final V newValue = furtherValues.getHead();
final FDate newValueKey = extractKey(key, newValue);
final int compare = key.compareTo(newValueKey);
if (compare < 0) {
// key < newValueKey
// run over the key we wanted
break;
} else if (compare == 0) {
// key == newValueKey
// This is the value we searched for! It will later be added with the db key to the cache.
pushLastValueFromFurtherValues();
return newValue;
} else {
// key > newValueKey
// put this value into the cache; gaps do not get filled here, so that the max size of the
// cache does not get reached prematurely
put(newValueKey, newValue, prevKey, prevValue);
pushLastValueFromFurtherValues();
// continue with the next one
prevValue = newValue;
prevKey = newValueKey;
if (furtherValues.isEmpty()
&& newValueKey.isBefore(maxKeyInDB)
&& key.isBefore(maxKeyInDB)
&& maxKeyInDBFromLoadFurtherValues.isBefore(maxKeyInDB)) {
final FDate timeForLoadFurtherValues =
FDates.max(newValueKey, earliestStartOfLoadFurtherValues);
Assertions.checkState(
eventuallyLoadFurtherValues(
"searchInFurtherValues", newValueKey, timeForLoadFurtherValues, false, true));
if (!furtherValues.isEmpty()) {
pushLastValueFromFurtherValues();
if (!timeForLoadFurtherValues.equals(newValue)) {
// do not distort prev/next lookup when using earlisetStartOfLoadFurtherValues, thus
// reset those
prevValue = null;
prevKey = null;
}
}
}
}
}
return prevValue;
}
private boolean isMinKeyInDBFromLoadFurtherValues() {
return minKeyInDBFromLoadFurtherValues != null
&& FDates.isSameMillisecond(minKeyInDBFromLoadFurtherValues, minKeyInDB);
}