java-buildpack/lib/java_buildpack/container/java_main.rb at master · Fewbytes/java-buildpack · GitHub

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# Encoding: utf-8
# Cloud Foundry Java Buildpack
# Copyright 2013-2016 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'java_buildpack/component/base_component'
require'java_buildpack/container'
require'java_buildpack/util/dash_case'
require'java_buildpack/util/java_main_utils'
require'java_buildpack/util/qualify_path'
require'java_buildpack/util/spring_boot_utils'

moduleJavaBuildpack
moduleContainer

# Encapsulates the detect, compile, and release functionality for applications running a simple Java +main()+
# method. This isn't a _container_ in the traditional sense, but contains the functionality to manage the lifecycle
# of Java +main()+ applications.
classJavaMain < JavaBuildpack::Component::BaseComponent
includeJavaBuildpack::Util

# Creates an instance
#
# @param [Hash] context a collection of utilities used the component
definitialize(context)
super(context)
@spring_boot_utils=JavaBuildpack::Util::SpringBootUtils.new
end

# (see JavaBuildpack::Component::BaseComponent#detect)
defdetect
main_class ? JavaMain.to_s.dash_case : nil
end

# (see JavaBuildpack::Component::BaseComponent#compile)
defcompile
returnunless@spring_boot_utils.is?(@application)
@droplet.additional_libraries.link_to(@spring_boot_utils.lib(@droplet))
end

# (see JavaBuildpack::Component::BaseComponent#release)
defrelease
manifest_class_path.each{ |path| @droplet.additional_libraries << path}

if@spring_boot_utils.is?(@application)
@droplet.environment_variables.add_environment_variable'SERVER_PORT','$PORT'
else
@droplet.additional_libraries.insert0,@application.root
end

classpath=@spring_boot_utils.is?(@application) ? '-cp $PWD/.' : @droplet.additional_libraries.as_classpath
release_text(classpath)
end

private

ARGUMENTS_PROPERTY='arguments'.freeze

CLASS_PATH_PROPERTY='Class-Path'.freeze

private_constant:ARGUMENTS_PROPERTY,:CLASS_PATH_PROPERTY

defrelease_text(classpath)
[
@droplet.java_opts.as_env_var,
'&&',
@droplet.environment_variables.as_env_vars,
'eval',
'exec',
"#{qualify_path@droplet.java_home.root,@droplet.root}/bin/java",
'$JAVA_OPTS',
classpath,
main_class,
arguments
].flatten.compact.join(' ')
end

defarguments
@configuration[ARGUMENTS_PROPERTY]
end

defmain_class
JavaBuildpack::Util::JavaMainUtils.main_class(@application,@configuration)
end

defmanifest_class_path
values=JavaBuildpack::Util::JavaMainUtils.manifest(@application)[CLASS_PATH_PROPERTY]
values.nil? ? [] : values.split(' ').map{ |value| @droplet.root + value}
end

end

end
end