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java_main.rb
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75 lines (59 loc) · 2.28 KB
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# 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 'java_buildpack/component/base_component'
require 'java_buildpack/container'
require 'java_buildpack/util/dash_case'
require 'java_buildpack/util/java_main_utils'
module JavaBuildpack::Container
# 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.
class JavaMain < JavaBuildpack::Component::BaseComponent
def detect
main_class ? JavaMain.to_s.dash_case : nil
end
def compile
end
def release
@droplet.additional_libraries.insert 0, @application.root
manifest_class_path.each { |path| @droplet.additional_libraries << path }
[
"#{@droplet.java_home.root}/bin/java",
@droplet.additional_libraries.as_classpath,
@droplet.java_opts.sort.join(' '),
main_class,
arguments,
port
].compact.join(' ')
end
private
ARGUMENTS_PROPERTY = 'arguments'.freeze
CLASS_PATH_PROPERTY = 'Class-Path'.freeze
def arguments
@configuration[ARGUMENTS_PROPERTY]
end
def main_class
JavaBuildpack::Util::JavaMainUtils.main_class(@application, @configuration)
end
def manifest_class_path
values = JavaBuildpack::Util::JavaMainUtils.manifest(@application)[CLASS_PATH_PROPERTY]
values.nil? ? [] : values.split(' ').map { |value| @droplet.root + value }
end
def port
main_class =~ /^org\.springframework\.boot\.loader\.(?:[JW]ar|Properties)Launcher$/ ? '--server.port=$PORT' : nil
end
end
end