/**
* Will delete snapshots older than 15 days, if there are at least two snapshots in the list. Will
* set the message that can be read with getMessage() to have more insight of what has happened.
*
* @param snapshotsOfaVolume the list of snapshots of a volume
* @return a list of snapshots to be deleted. if none, it will be an empty list
*/
public final List<MySnapshot> snapshotsToBeDeleted(final List<MySnapshot> snapshotsOfaVolume) {
List<MySnapshot> toBeDeleted = new ArrayList<MySnapshot>();
message = "";
if (snapshotsOfaVolume.size() == 0) {
return toBeDeleted; // there are no Snapshots at all, so nothing to be deleted
}
int volumeSize = snapshotsOfaVolume.get(0).getSizeInGb();
if (volumeSize <= thresholdGb && snapshotsOfaVolume.size() <= howManyCopiesForSmallVolumes) {
message =
"Skipped deletion because I don't have more than "
+ howManyCopiesForSmallVolumes
+ " snapshots";
return toBeDeleted; // empty list
}
if (volumeSize > thresholdGb && snapshotsOfaVolume.size() <= howManyCopiesForBigVolumes) {
message =
"Skipped deletion because I don't have more than "
+ howManyCopiesForBigVolumes
+ " snapshots";
return toBeDeleted; // empty list
}
for (MySnapshot snapshot : snapshotsOfaVolume) {
if (snapshot.howManyDaysAgo() > howManyDaysBeforeDeleting) {
toBeDeleted.add(snapshot);
}
}
return toBeDeleted;
}
/**
* From a list of snapshots of a volume, tells if the snapshots need a backup or not. The current
* policy is that if the last snapshot is older than 7 days (8 or more), we need a backup. If the
* snapshot is greater than 140 Gb, we need a backup only every 14 days.
*
* @param snapShotsOfAVolume the snapshots of a volume (it's responsibility of the caller to
* provide those)
* @return true
*/
public final boolean needBackup(final List<MySnapshot> snapShotsOfAVolume) {
int size, daysAgo;
message = "";
for (MySnapshot snapshot : snapShotsOfAVolume) {
size = snapshot.getSizeInGb();
daysAgo = snapshot.howManyDaysAgo();
if (size <= thresholdGb && daysAgo <= everyHowManyDaysForSmallVolumes) {
return false;
} else if (size > thresholdGb && daysAgo <= everyHowManyDaysForBigVolumes) {
return false;
}
}
return true;
}
