Use OpenJDK8 for CircleCI builds + refactor build config (#140)

Author: tovbinm

.circleci/config.yml

@@ -1,51 +1,58 @@
 version: 2
 
+machine-config: &machine-config
+  machine: true
+  working_directory: ~/repo
+  environment:
+    TERM: dumb
+    GRADLE_OPTS: -Xmx256m
+
+shared-steps:
+  open-jdk: &open-jdk
+    run:
+      name: Update Java to OpenJDK
+      command: |
+        sudo update-alternatives --set java /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java
+        sudo update-alternatives --set javac /usr/lib/jvm/java-8-openjdk-amd64/bin/javac
+        export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64
+        java -version
+  save-gradle-cache: &save-gradle-cache
+    save_cache:
+      key: gcache-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
+      paths:
+        - ~/.gradle
+        - ~/.m2
+  restore-gradle-cache: &restore-gradle-cache
+    restore_cache:
+      keys:
+        - gcache-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
+
 jobs:
-  scala_style_check:
-    machine: true
-    working_directory: ~/repo
-    environment:
-      TERM: dumb
-      GRADLE_OPTS: -Xmx256m
+  scala-style:
+    <<: *machine-config
     steps:
       - checkout
+      - *open-jdk
       - run:
           name: Scala style check
-          command: ./gradlew --parallel scalaStyle
-  clone_repo_and_compile_project:
-    machine: true
-    working_directory: ~/repo
-    environment:
-      TERM: dumb
-      GRADLE_OPTS: -Xmx256m
+          command: java -version && ./gradlew -v && ./gradlew --parallel scalaStyle
+  compile:
+    <<: *machine-config
     steps:
       - checkout
-      - restore_cache:
-          keys:
-            - gcache-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
-      - run:
-          name: Java version
-          command: java -version
+      - *open-jdk
+      - *restore-gradle-cache
       - run:
           name: Clone repo & compile project
-          command: ./gradlew --parallel testScoverageClasses
-      - save_cache:
-          key: gcache-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
-          paths:
-            - ~/.gradle
-            - ~/.m2
-  build:
-    machine: true
-    working_directory: ~/repo
-    environment:
-      TERM: dumb
-      GRADLE_OPTS: -Xmx256m
+          command: java -version && ./gradlew -v && ./gradlew --parallel testScoverageClasses
+      - *save-gradle-cache
+  test:
+    <<: *machine-config
     parallelism: 4
     steps:
       - checkout
-      - restore_cache:
-          keys:
-            - gcache-{{ .Branch }}-{{ checksum ".circleci/config.yml" }}-{{ checksum "build.gradle" }}-{{ checksum "gradle/wrapper/gradle-wrapper.properties" }}
+      - *open-jdk
+      - *restore-gradle-cache
       - run:
           name: Build project
           command: |
@@ -55,7 +62,7 @@ jobs:
             TEST_FILES=$(echo "$TEST_FILES" | circleci tests split --split-by=timings --timings-type=classname --index=$CIRCLE_NODE_INDEX | tr ' ' '\n' | cut -d "/" -f5-$2 | sed 's/.\{6\}$/\*/g')
             echo -e "Test files running on this container : `eval $COUNT_TEST_FILE_CMD`\n$TEST_FILES\n"
             export TEST_FILES=$(echo "$TEST_FILES" | sed 's/\\n$//' )
-            ./gradlew reportScoverage
+            java -version && ./gradlew -v && ./gradlew reportScoverage
       - run:
           name: Collect test results
           command: |
@@ -76,9 +83,9 @@ workflows:
   version: 2
   build:
     jobs:
-      - scala_style_check
-      - clone_repo_and_compile_project
-      - build:
+      - scala-style
+      - compile
+      - test:
           requires:
-            - scala_style_check
-            - clone_repo_and_compile_project
+            - scala-style
+            - compile