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

This article is to share with you about how to carry out source code analysis Detect, the editor feels very practical, so share it with you to learn, I hope you can get something after reading this article, say no more, follow the editor to have a look.

Detect

The contents of the buildpack probe include: container, JRE, framework. The details can be seen in components.yml:

# Configuration for components to use in the buildpack---containers:- "JavaBuildpack::Container::DistZip"-"JavaBuildpack::Container::Groovy"-"JavaBuildpack::Container::JavaMain"-"JavaBuildpack::Container::PlayFramework"-"JavaBuildpack::Container::Ratpack"-"JavaBuildpack::Container::SpringBoot"-"JavaBuildpack::Container::SpringBootCLI"-"JavaBuildpack::Container::Tomcat" # In order to use Oracle JREs instead of OpenJDK You must comment out the OpenJDK line and uncomment the Oracle line.# Please see the documentation for more detail.jres:- "JavaBuildpack::Jre::OpenJdkJRE" #-"JavaBuildpack::Jre::OracleJRE" frameworks:- "JavaBuildpack::Framework::AppDynamicsAgent"-"JavaBuildpack::Framework::JavaOpts"-"JavaBuildpack::Framework::MariaDbJDBC"-"JavaBuildpack::Framework::NewRelicAgent"-"JavaBuildpack::Framework::PlayFrameworkAutoReconfiguration"-"JavaBuildpack::Framework::PlayFrameworkJPAPlugin"-"JavaBuildpack :: Framework::PostgresqlJDBC "-" JavaBuildpack::Framework::SpringAutoReconfiguration "-" JavaBuildpack::Framework::SpringInsight "

From this file, you can know the containers, JRE and frameworks supported by the buidpack. Of course you can add it yourself.

The entry to detect is bin/detect, which is a very simple script that calls the with_buildpack static method of JavaBuildpack to create an instance, and then calls the JavaBuildpack.detect method in the code block. Finally, the result of the detect is composed into a string output, and if the probe is not correct, nothing is output.

Components = JavaBuildpack::Buildpack.with_buildpack (build_dir, 'Detect failed with exception% s') do | buildpack | # here with_buildpack creates an instance of JavaBuildpack::Buildpack. You can see buildpack.detectend.compact by viewing buildpack.rb.

Next, look at the JavaBuildpack::Buildpack class, in buildpack.rb.

With_buildpack method

It's in class e handle_error (e, message) end

Pay special attention to the sentence in which the annotation is added with * *, the grammar is relatively roundabout.

Detect method

The detect method detects the container, JRE and framework used by the application respectively.

Def detect tags = tag_detection ('container', @ containers, true) tags.concat tag_detection (' JRE', @ jres, true) unless tags.empty? # if not empty, connect to tags tags.concat tag_detection ('framework', @ frameworks, false) unless tags.empty? Tags

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