Rename package and conf to pekko

[mdedetrich]

So the PR is now ready, some things to note:

• There is an issue with jackson dependencies that should probably be looked into afterwards (see Rename package and conf to pekko #19 (review))
• Projection deals with SQL like databases (such as cassandra and JDBC) which involves schemas. This means that a lot of schema's also had to be updated (originally they had akka_ prefix, now have pekko_ prefix)
• Conf and package changes needed to be done at once because of now using Pekko dependencies rather than akka
• Imports have also been cleaned up (they don't use FQCN and the render of documentation looks correct, checked locally)

[mdedetrich]

Currently blocked by

• Update pekko snapshot pekko-grpc#52
• Freeze Pekko Snapshot pekko-http#127
• Update pekko snapshot version pekko-connectors-kafka#51
• Update pekko http version pekko-connectors#77
• Update pekko snapshot pekko-persistence-cassandra#39
• Update pekko snapshot pekko-management#48
• Allow manual trigger for nightly publish pekko-connectors-kafka#52

[jrudolph]

This diff should resolve the dependency problems:

diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 98eb607..41ca262 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -89,6 +89,8 @@ object Dependencies {
   object Examples {
     val hibernate = "org.hibernate" % "hibernate-core" % "5.4.33"
 
+    val pekkoPersistenceQuery = "org.apache.pekko" %% "pekko-persistence-query" % Versions.pekko
+    val pekkoPersistence = "org.apache.pekko" %% "pekko-persistence" % Versions.pekko
     val pekkoPersistenceTyped = "org.apache.pekko" %% "pekko-persistence-typed" % Versions.pekko
     val pekkoClusterShardingTyped = "org.apache.pekko" %% "pekko-cluster-sharding-typed" % Versions.pekko
     val pekkoPersistenceCassandra = "org.apache.pekko" %% "pekko-persistence-cassandra" % "0.0.0-1071-8529fe4f-SNAPSHOT"
@@ -189,12 +191,15 @@ object Dependencies {
   val examples =
     deps ++= Seq(
       Examples.pekkoPersistenceTyped,
+      Examples.pekkoPersistenceQuery,
+      Examples.pekkoPersistence,
       Examples.pekkoClusterShardingTyped,
       Examples.pekkoPersistenceCassandra,
       Examples.pekkoPersistenceJdbc,
       Examples.pekkoSerializationJackson,
       Examples.hibernate,
       Test.h2Driver,
+      Test.pekkoStreamTestkit,
       Test.pekkoTypedTestkit,
       Test.logback,
       Test.cassandraContainer)

[mdedetrich]

This diff should resolve the dependency problems:

I am not that familiar with Pekko projection, does it make sense to do this change outside of the context of this problem specifically (or in other words is not having the changes you are pointing out an oversight?)

The reason why I didn't want to do any such changes right now is I wanted to keep the changes to a minimum, at least until the major restructurings to the project are done (which is what this PR is doing). Can definitely do this change once all of the other stuff is handled.

[jrudolph]

There is still something going on with Jackson versions with pekko-serialization-jackson and the cassandra driver pulled in from pekko-persistence-cassandra fighting over Jackson 2.11 vs 2.12.

[jrudolph]

I am not that familiar with Pekko projection, does it make sense to do this change outside of the context of this problem specifically (or in other words is not having the changes you are pointing out an oversight?)

I'm also not familiar. Though, the proposed change only changes the examples, so that should be no problem.

[mdedetrich]

There is still something going on with Jackson versions with pekko-serialization-jackson and the cassandra driver pulled in from pekko-persistence-cassandra fighting over Jackson 2.11 vs 2.12.

Yeah this is one of the reasons why I wanted to avoid fixing the dependency resolution issue right now, I had an intuition its more complicated than it looks on the surface. Definitely makes sense to resolve this at some point but it can be properly be done later (I made an issue at #20).

[jrudolph]

There is still something going on with Jackson versions with pekko-serialization-jackson and the cassandra driver pulled in from pekko-persistence-cassandra fighting over Jackson 2.11 vs 2.12.

I looked into it and basically the issue seems to be that this setup only works with an older alpakka-cassandra version which used to use the cassandra 4.6.2 driver but now uses 4.13.0.

Yeah this is one of the reasons why I wanted to avoid fixing the dependency resolution issue right now, I had an intuition its more complicated than it looks on the surface. Definitely makes sense to resolve this at some point but it can be properly be done later (I will make an issue).

What does postponing mean exactly? For me it looks like, our current set of source code is just not compatible enough to allow pekko-projection to be used with pekko-persistence-cassandra. This might be a quite tricky issue that needs to be considered with all pekko modules in mind. Let's continue a discussion on a greater scale in apache/pekko#7.

[mdedetrich]

What does postponing mean exactly? For me it looks like, our current set of source code is just not compatible enough to allow pekko-projection to be used with pekko-persistence-cassandra. This might be a quite tricky issue that needs to be considered with all pekko modules in mind. Let's continue a discussion on a greater scale in apache/incubator-pekko#7.

What I mean by postponing is that right now I am just interested in doing the package/conf renaming and later on updating header files/setting up for publishing etc etc. It may be true that the source code is not compatible, if so it should be done after this PR because its this PR in the first place that is changing the dependencies from Akka to Pekko.

[jrudolph]

Sounds good for me!

[mdedetrich]

@jrudolph So I ended up having to remove Examples.pekkoSerializationJackson from here because

[error] Caused by: com.fasterxml.jackson.databind.JsonMappingException: Scala module 2.11.4 requires Jackson Databind version >= 2.11.0 and < 2.12.0
[error] 	at com.fasterxml.jackson.module.scala.JacksonModule.setupModule(JacksonModule.scala:61)
[error] 	at com.fasterxml.jackson.module.scala.JacksonModule.setupModule$(JacksonModule.scala:46)

Even through what I can tell the whole point of Examples.pekkoSerializationJackson is to actually force the version of jackson (which is 2.11.4) but it actually seems to be causing problems.

[nvollmar]

I couldn't leave comments on the changes for some reason. Found some @apidoc[pekko. that should be @apidoc[org.apache.pekko. since they are fqcn

[nvollmar]

I couldn't leave comments on the changes for some reason. Found some @apidoc[pekko. that should be @apidoc[org.apache.pekko. since they are fqcn

[mdedetrich]

I couldn't leave comments on the changes for some reason. Found some @apidoc[pekko. that should be @apidoc[org.apache.pekko. since they are fqcn

Faurly sure apidoc doesn't need FQCN because it refers to paradox root setting that has been set to org.apache.pekko. This is the same as other pekko projects and if it was wrong the doc/paradox project wouldn't even compile.

[nvollmar]

@mdedetrich thanks, good to know.

[nvollmar]

lgtm