Extract the kafka streams and flink use case and load generator
and commons dependencies to a convention plugin to reduce the
complexety of the main build gradle file.

Create convention plugins to reduce complexity of the root build.gradle file

Co-authored-by: Nico Biernat <stu209212@mail.uni-kiel.de>

Configure the Kafka Streams configuration in a common class and not
add them in every UC application. This enhances maintainability of
common shared configurations.
Further enable more configurations to set for the Kafka Streams
application.

Update spotbugs plugin.

-Use aggregation from titan with dataflow
-Add an aggregation-feedback topic
-Enable logging in UC2 with new slf4j version
-Use newer Kafkastreams version
-Remove unused ConfigurationKeys class

Replace the kieker records with the avro records from titan.
Further use the builder pattern in the KafkaRecordSender to enable
creation with different parameters.

Due to the merge the project was not possible to build with gradle.
Because both projects changed the gradle build file some properties
were not added to the correct places in the file.
Further in one configuration class the same property existed twice.
diff --git a/application-kafkastreams-commons/src/main/java/theodolite/commons/kafkastreams/ConfigurationKeys.java b/application-kafkastreams-commons/src/main/java/theodolite/commons/kafkastreams/ConfigurationKeys.java
index 61fb135..260dbba 100644
--- a/application-kafkastreams-commons/src/main/java/theodolite/commons/kafkastreams/ConfigurationKeys.java
+++ b/application-kafkastreams-commons/src/main/java/theodolite/commons/kafkastreams/ConfigurationKeys.java
@@ -15,10 +15,6 @@ public final class ConfigurationKeys {

   public static final String CACHE_MAX_BYTES_BUFFERING = "cache.max.bytes.buffering";

-  public static final String APPLICATION_NAME = "application.name";
-
-  public static final String APPLICATION_VERSION = "application.version";
-
   public static final String KAFKA_BOOTSTRAP_SERVERS = "kafka.bootstrap.servers";

   public static final String SCHEMA_REGISTRY_URL = "schema.registry.url";
diff --git a/build.gradle b/build.gradle
index 1caf1b6..797d103 100644
--- a/build.gradle
+++ b/build.gradle
@@ -69,9 +69,6 @@ configure(useCaseApplications) {
       implementation 'org.slf4j:slf4j-simple:1.6.1'
       implementation project(':application-kafkastreams-commons')

-      // These dependencies are used for the workload-generator-commmon
-      implementation project(':workload-generator-commons')
-
       // Use JUnit test framework
       testImplementation 'junit:junit:4.12'
   }
@@ -82,10 +79,13 @@ configure(useCaseGenerators) {
   dependencies {
       // These dependencies are used internally, and not exposed to consumers on their own compile classpath.
       // implementation('org.industrial-devops:titan-ccp-common:0.1.0-SNAPSHOT') { changing = true }
-      implementation('org.industrial-devops:titan-ccp-common-kafka:0.1.0-SNAPSHOT') { changing = true }
+      // implementation('org.industrial-devops:titan-ccp-common-kafka:0.1.0-SNAPSHOT') { changing = true }
       implementation 'com.google.guava:guava:24.1-jre'
       implementation 'org.jctools:jctools-core:2.1.1'
       implementation 'org.slf4j:slf4j-simple:1.6.1'
+
+      // These dependencies are used for the workload-generator-commmon
+      implementation project(':workload-generator-commons')

       // maintain build of generators
       implementation 'net.kieker-monitoring:kieker:1.14'
@@ -102,12 +102,12 @@ configure(commonProjects) {
       // These dependencies is exported to consumers, that is to say found on their compile classpath.
       api 'org.apache.kafka:kafka-clients:2.4.0'
       api('org.industrial-devops:titan-ccp-common:0.0.3-SNAPSHOT') { changing = true }
-      api 'net.kieker-monitoring:kieker:1.14-SNAPSHOT'
+      api 'net.kieker-monitoring:kieker:1.14'

       // These dependencies are used internally, and not exposed to consumers on their own compile classpath.
       implementation 'org.slf4j:slf4j-simple:1.6.1'
-      implementation('org.industrial-devops:titan-ccp-common:0.1.0-SNAPSHOT') { changing = true }
-      implementation('org.industrial-devops:titan-ccp-common-kafka:0.1.0-SNAPSHOT') { changing = true }
+      // implementation('org.industrial-devops:titan-ccp-common:0.1.0-SNAPSHOT') { changing = true }
+      // implementation('org.industrial-devops:titan-ccp-common-kafka:0.1.0-SNAPSHOT') { changing = true }

       // Use JUnit test framework
       testImplementation 'junit:junit:4.12'

Replace the kieker records for reading and writing to/from kafka
with the avro records from Titan.

- Define variables for commons projects and uc projects
- Add different dependencies to the different subprojects
- Apply application plugin only to ucs
- allow uc to use the commons project as dependency

diff --git a/build.gradle b/build.gradle
index 6827860..694a127 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,20 +10,27 @@ buildscript {
   }
 }

-// Plugins for all projects
+// Variables used to distinct different subprojects
+def useCaseProjects = subprojects.findAll {it -> it.name.matches('uc(.)*')}
+def commonProjects = subprojects.findAll {it -> it.name.matches('(.)*commons(.)*')}
+
+
+// Plugins
 allprojects {
   apply plugin: 'eclipse'
 }

-// Plugins for subprojects
 subprojects {
-  apply plugin: 'application'
   apply plugin: 'checkstyle'
   apply plugin: 'pmd'
   apply plugin: 'com.github.spotbugs'
   apply plugin: 'java-library'
 }

+configure(useCaseProjects){
+    apply plugin: 'application'
+}
+
 // Java version for all subprojects
 subprojects {
   java {
@@ -47,8 +54,8 @@ allprojects {
 	}
 }

-// Dependencies
-subprojects {
+// Dependencies for all use cases
+configure(useCaseProjects) {
   dependencies {
       // These dependencies is exported to consumers, that is to say found on their compile classpath.
       api('org.industrial-devops:titan-ccp-common:0.0.3-SNAPSHOT') { changing = true }
@@ -60,6 +67,22 @@ subprojects {
       implementation 'com.google.guava:guava:24.1-jre'
       implementation 'org.jctools:jctools-core:2.1.1'
       implementation 'org.slf4j:slf4j-simple:1.6.1'
+      implementation project(':application-kafkastreams-commons')
+
+      // Use JUnit test framework
+      testImplementation 'junit:junit:4.12'
+  }
+}
+
+// Dependencies for all commons
+configure(commonProjects) {
+  dependencies {
+      // These dependencies is exported to consumers, that is to say found on their compile classpath.
+      api 'org.apache.kafka:kafka-clients:2.4.0'
+
+      // These dependencies are used internally, and not exposed to consumers on their own compile classpath.
+      implementation 'org.slf4j:slf4j-simple:1.6.1'
+      implementation('org.industrial-devops:titan-ccp-common:0.0.3-SNAPSHOT') { changing = true }

       // Use JUnit test framework
       testImplementation 'junit:junit:4.12'

Enables the execution of the code quality tools in the subprojects
and configures them in a central place.