@Override
public void saveAllMembersAndSubsystems(Collection<Member> members) {
LocalDateTime now = LocalDateTime.now();
// process members
Map<MemberId, Member> unprocessedOldMembers = new HashMap<>();
StreamSupport.stream(memberRepository.findAll().spliterator(), false)
.forEach(member -> unprocessedOldMembers.put(member.createKey(), member));
for (Member member : members) {
Member oldMember = unprocessedOldMembers.get(member.createKey());
if (oldMember == null) {
// brand new item
member.getStatusInfo().setTimestampsForNew(now);
for (Subsystem subsystem : member.getAllSubsystems()) {
subsystem.getStatusInfo().setTimestampsForNew(now);
subsystem.setMember(member);
}
member = memberRepository.save(member);
} else {
handleOldMember(now, member, oldMember);
member = memberRepository.save(oldMember);
}
unprocessedOldMembers.remove(member.createKey());
}
// now unprocessedOldMembers should all be removed (either already removed, or will be now)
removeUnprocessedOldMembers(now, unprocessedOldMembers);
}
private void handleOldMember(LocalDateTime now, Member member, Member oldMember) {
oldMember.updateWithDataFrom(member, now);
// process subsystems for the old member
Map<SubsystemId, Subsystem> unprocessedOldSubsystems = new HashMap<>();
for (Subsystem subsystem : oldMember.getAllSubsystems()) {
unprocessedOldSubsystems.put(subsystem.createKey(), subsystem);
}
for (Subsystem subsystem : member.getAllSubsystems()) {
Subsystem oldSubsystem = unprocessedOldSubsystems.get(subsystem.createKey());
if (oldSubsystem == null) {
// brand new item, add it
subsystem.getStatusInfo().setTimestampsForNew(now);
subsystem.setMember(oldMember);
oldMember.getAllSubsystems().add(subsystem);
} else {
oldSubsystem.getStatusInfo().setTimestampsForFetched(now);
}
unprocessedOldSubsystems.remove(subsystem.createKey());
}
// remaining old subsystems - that were not included in member.subsystems -
// are removed (if not already)
for (Subsystem oldToRemove : unprocessedOldSubsystems.values()) {
StatusInfo status = oldToRemove.getStatusInfo();
if (!status.isRemoved()) {
status.setTimestampsForRemoved(now);
}
}
}
private void removeUnprocessedOldMembers(
LocalDateTime now, Map<MemberId, Member> unprocessedOldMembers) {
for (Member oldToRemove : unprocessedOldMembers.values()) {
StatusInfo status = oldToRemove.getStatusInfo();
if (!status.isRemoved()) {
status.setTimestampsForRemoved(now);
}
for (Subsystem subsystem : oldToRemove.getAllSubsystems()) {
if (!subsystem.getStatusInfo().isRemoved()) {
subsystem.getStatusInfo().setTimestampsForRemoved(now);
}
}
}
}