open_jdk_like.rb

# Encoding: utf-8
# Cloud Foundry Java Buildpack
# Copyright 2013 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

require 'fileutils'
require 'java_buildpack/component/versioned_dependency_component'
require 'java_buildpack/jre'
require 'java_buildpack/jre/memory/openjdk_memory_heuristic_factory'

module JavaBuildpack::Jre

  # Encapsulates the detect, compile, and release functionality for selecting an OpenJDK-like JRE.
  class OpenJDKLike < JavaBuildpack::Component::VersionedDependencyComponent

    # Creates an instance
    #
    # @param [Hash] context a collection of utilities used the component
    def initialize(context)
      super(context)
      @droplet.java_home.root = @droplet.sandbox
    end

    # @macro base_component_compile
    def compile
      download_tar
      @droplet.copy_resources
    end

    # @macro base_component_release
    def release
      @droplet.java_opts
      .add_system_property('java.io.tmpdir', '$TMPDIR')
      .add_option('-XX:OnOutOfMemoryError', killjava)
      .concat memory
    end

    protected

    # @macro versioned_dependency_component_supports
    def supports?
      true
    end

    private

    KEY_MEMORY_HEURISTICS = 'memory_heuristics'.freeze

    KEY_MEMORY_SIZES = 'memory_sizes'.freeze

    def killjava
      @droplet.sandbox + 'bin/killjava.sh'
    end

    def memory
      sizes = @configuration[KEY_MEMORY_SIZES] || {}
      heuristics = @configuration[KEY_MEMORY_HEURISTICS] || {}
      OpenJDKMemoryHeuristicFactory.create_memory_heuristic(sizes, heuristics, @version).resolve
    end

  end

end