feat: provide multitenancy runtime #477

ndr-brt · 2022-10-17T13:51:07Z

what

Provides multi-tenancy extension with a MultiTenantRuntime class, that can be used to run a multi-tenant EDC

why

This is a requirement for PI6

notes

I created a samples folder containing a sample that shows how the multi-tenancy could be used

denisneuling · 2022-10-18T07:08:19Z

...ns/multi-tenancy/src/main/java/org/eclipse/tractusx/edc/boot/runtime/MultiTenantRuntime.java

+    try (var classLoader = URLClassLoader.newInstance(entries, getSystemClassLoader())) {
+      var runtimeThread =
+          new Thread(
+              () -> {
+                try {
+                  Thread.currentThread().setContextClassLoader(classLoader);
+                  super.boot();
+                } catch (Exception e) {
+                  throw new EdcException(e);
+                }
+              });


Just curious: If the Classloader instance is closed, once the thread has been instantiated, is it still capable to use it? For my understanding once the resource has been closed it shouldn't be able to be used anymore and all associated refs going to be gc'ed...

woa, you're right, I didn't closed it at first, but then SonarCloud said like "hey, you have to close it", it was afternoon and I listened too it without asking a lot :D
Will fix it
Actually I tested it, load up the sample connector with 3 tenants with "in memory" stores, start pushing data, after GC intervention everything is still working correctly.
This is a concept and we need to test it further, but for the moment it seems to work