mirror of https://github.com/apache/cloudstack.git
c60dbfd2c8
Using a hierarchy of database version rather than a flat
list of them. Adding a new schema upgrade path was really
cumbersome and error-prone, because we needed to maintain
a flat map of versions and their corresponding list of
upgrade paths (`DbUpgrade`). Instead we're using a logical
hierarchy structure of versions:
```
DatabaseVersionHierarchy.builder()
.next("4.0.0" , new Upgrade40to41())
.next("4.0.1" , new Upgrade40to41())
.next("4.0.2" , new Upgrade40to41())
.next("4.1.0" , new Upgrade410to420())
.next("4.1.1" , new Upgrade410to420())
.next("4.2.0" , new Upgrade420to421())
...
.next("4.2.1" , new Upgrade421to430())
.next("4.9.3.0" , new Upgrade4930to41000())
.next("4.10.0.0", new Upgrade41000to41100())
.next("4.11.0.0", new Upgrade41100to41110())
.build();
```
With this change, when we need to add a new version upgrade
path, we only need to add it in correct place in the hierarchy
rather than add that in dozens of places in `_upgradeMap`.
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