language: java

dist: precise

jdk:
  - oraclejdk8

cache:
  directories:
    - $HOME/.m2

matrix:
  include:
    - sudo: false
      install: true
      script:
        # The script execution consists of 4 steps:
        # 1) Increase the jvm max heap size. Strict compilation in 2) requires more than 2 GB.
        # 2) Strict compilation using error-prone
        # 3) Reset the maven options. Parallel testing in 4) launches 2 processes, each requires 1 GB of memory. Increasing the maximum memory may cause OutOfMemory error because the instance of Travis has 4 GB of memory space.
        # 4) Parallel unit testing
        # Using && instead of independent script steps to make Travis build fail faster, if each step is not successful
        - echo "MAVEN_OPTS='-Xmx3000m'" > ~/.mavenrc && mvn clean -Pstrict -pl '!benchmarks' compile test-compile -B && rm ~/.mavenrc && mvn test -B -Pparallel-test -Dmaven.fork.count=2
    - sudo: required
      dist: trusty
      services:
        - docker
      env:
        - DOCKER_IP=172.17.0.1
      install:
        # Only errors will be shown with the -q option. This is to avoid generating too many logs which make travis build failed.
        - mvn clean install -q -ff -DskipTests -B
      script:
        - $TRAVIS_BUILD_DIR/ci/travis_script_integration.sh