Shulou(Shulou.com)06/01 Report--

How to use source code to analyze Compile, in view of this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

Bin/compile

The entry is: bin/compile, which is similar to the detect script: you need a build directory to instantiate the buildpack object and call its compile interface.

Note: there seems to be only one parameter in this script, but the second parameter is actually required at run time: the application cache directory, when downloading JDK

Compile method

Compilempilecompile first calls component_detection, probes the support for containers and JRE,framework, and then calls the compilation of JRE, the compilation of each framework, and the compilation of containers.

Ruby code

Def compile

Puts BUILDPACK_MESSAGE% @ buildpack_version

Container = component_detection ('container', @ containers, true) .first

Fail'No container can run this application' unless container

Component_detection ('JRE', @ jres, true) .first.compile

Component_detection ('framework', @ frameworks, false) .each (&: compile) # calls the compilation of each framework

Container.compile

End

Component_detection returns component, for example, component_detection of JRE returns JavaBuildpack::Jre::OpenJdkJRE.

Compilation of JRE

JRE compilation calls JavaBuildpack::Jre::OpenJdkJRE 's compile, and JavaBuildpack::Jre::OpenJdkJRE inherits from OpenJDKLike, so it can be traced back to OpenJDKLike's compile.

Ruby code

Def compile

Download_tar

@ droplet.copy_resources

End

You can see that the compilation did two things:

Download the package of Jdk and copy resources, that is, copy the files under resources/open_jdk_jre

Compilation of Tomcat

The compilation of the container calls JavaBuildpack::Container::Tomcat 's compile, which is defined in its parent class: JavaBuildpack::Component::ModularComponent

Java code

Def compile

@ sub_components.each (&: compile)

End

That is, to invoke the compilation of its subcomponents, including: TomcatInstance,TomcatLifecycleSupport,TomcatLoggingSupport,TomcatAccessLoggingSupport,TomcatRedisStore,TomcatInsightSupport.

Compile method of TomcatInstance

The compile method does three things:

1. Download tomcat's package

two。 Link the user application root directory in the webapps/WEB-INF/ROOT of tomcat

3. Link the jar package to WEB-INF/lib

Ruby code

Def compile

Download (@ version, @ uri) {| file | expand file}

Link_to (@ application.root.children, root)

@ droplet.additional_libraries

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