Integration with Netflix OSS components
//// DO NOT EDIT THIS FILE. IT WAS GENERATED. Manual changes to this file will be lost when it is generated again. Edit the files in the src/main/asciidoc/ directory instead. ////
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:sc-ext: java :project-full-name: Spring Cloud Netflix
image::https://circleci.com/gh/spring-cloud/spring-cloud-netflix/tree/master.svg?style=svg["CircleCI", link="https://circleci.com/gh/spring-cloud/spring-cloud-netflix/tree/master"] image::https://codecov.io/gh/spring-cloud/spring-cloud-netflix/branch/master/graph/badge.svg["Codecov", link="https://codecov.io/gh/spring-cloud/spring-cloud-netflix/branch/master"] image::https://api.codacy.com/project/badge/Grade/a6885a06921e4f72a0df0b7aabd6d118["Codacy code quality", link="https://www.codacy.com/app/Spring-Cloud/spring-cloud-netflix?utmsource=github.com&utmmedium=referral&utmcontent=spring-cloud/spring-cloud-netflix&utmcampaign=Badge_Grade"]
:doctype: book :idprefix: :idseparator: - :toc: left :toclevels: 4 :tabsize: 4 :numbered: :sectanchors: :sectnums: :icons: font :hide-uri-scheme: :docinfo: shared,private
:sc-ext: java :project-full-name: Spring Cloud Netflix
This project provides Netflix OSS integrations for Spring Boot apps through autoconfiguration and binding to the Spring Environment and other Spring programming model idioms. With a few simple annotations you can quickly enable and configure the common patterns inside your application and build large distributed systems with battle-tested Netflix components. The patterns provided include Service Discovery (Eureka), Circuit Breaker (Hystrix), Intelligent Routing (Zuul) and Client Side Load Balancing (Ribbon).
== Features
:doctype: book :idprefix: :idseparator: - :toc: left :toclevels: 4 :tabsize: 4 :numbered: :sectanchors: :sectnums: :icons: font :hide-uri-scheme: :docinfo: shared,private
:sc-ext: java :project-full-name: Spring Cloud Netflix
== Modules In Maintenance Mode
Placing a module in maintenance mode means that the Spring Cloud team will no longer be adding new features to the module. We will fix blocker bugs and security issues, and we will also consider and review small pull requests from the community.
We intend to continue to support these modules for a period of at least a year from the general availability of the Greenwich release train.
The following Spring Cloud Netflix modules and corresponding starters will be placed into maintenance mode:
NOTE: This does not include the Eureka modules.
== Building
:jdkversion: 1.8
=== Basic Compile and Test
To build the source you will need to install JDK {jdkversion}.
Spring Cloud uses Maven for most build-related activities, and you should be able to get off the ground quite quickly by cloning the project you are interested in and typing
NOTE: You can also install Maven (>=3.3.3) yourself and run the
mvncommand in place of
./mvnwin the examples below. If you do that you also might need to add
-P springif your local Maven settings do not contain repository declarations for spring pre-release artifacts.
NOTE: Be aware that you might need to increase the amount of memory available to Maven by setting a
MAVEN_OPTSenvironment variable with a value like
-Xmx512m -XX:MaxPermSize=128m. We try to cover this in the
.mvnconfiguration, so if you find you have to do it to make a build succeed, please raise a ticket to get the settings added to source control.
For hints on how to build the project look in
.travis.ymlif there is one. There should be a "script" and maybe "install" command. Also look at the "services" section to see if any services need to be running locally (e.g. mongo or rabbit). Ignore the git-related bits that you might find in "before_install" since they're related to setting git credentials and you already have those.
The projects that require middleware generally include a
docker-compose.yml, so consider using https://docs.docker.com/compose/[Docker Compose] to run the middeware servers in Docker containers. See the README in the https://github.com/spring-cloud-samples/scripts[scripts demo repository] for specific instructions about the common cases of mongo, rabbit and redis.
NOTE: If all else fails, build with the command from
.travis.yml(usually
./mvnw install).
=== Documentation
The spring-cloud-build module has a "docs" profile, and if you switch that on it will try to build asciidoc sources from
src/main/asciidoc. As part of that process it will look for a
README.adocand process it by loading all the includes, but not parsing or rendering it, just copying it to
${main.basedir}(defaults to
${basedir}, i.e. the root of the project). If there are any changes in the README it will then show up after a Maven build as a modified file in the correct place. Just commit it and push the change.
=== Working with the code If you don't have an IDE preference we would recommend that you use https://www.springsource.com/developer/sts[Spring Tools Suite] or https://eclipse.org[Eclipse] when working with the code. We use the https://eclipse.org/m2e/[m2eclipse] eclipse plugin for maven support. Other IDEs and tools should also work without issue as long as they use Maven 3.3.3 or better.
==== Importing into eclipse with m2eclipse We recommend the https://eclipse.org/m2e/[m2eclipse] eclipse plugin when working with eclipse. If you don't already have m2eclipse installed it is available from the "eclipse marketplace".
NOTE: Older versions of m2e do not support Maven 3.3, so once the projects are imported into Eclipse you will also need to tell m2eclipse to use the right profile for the projects. If you see many different errors related to the POMs in the projects, check that you have an up to date installation. If you can't upgrade m2e, add the "spring" profile to your
settings.xml. Alternatively you can copy the repository settings from the "spring" profile of the parent pom into your
settings.xml.
==== Importing into eclipse without m2eclipse If you prefer not to use m2eclipse you can generate eclipse project metadata using the following command:
$ ./mvnw eclipse:eclipse
The generated eclipse projects can be imported by selecting
import existing projectsfrom the
filemenu.
NOTE: To build the module
spring-cloud-netflix-hystrix-contractalong with the entire Netflix project run the
build.shscript in the
scriptsdirectory.
== Contributing
:spring-cloud-build-branch: master
Spring Cloud is released under the non-restrictive Apache 2.0 license, and follows a very standard Github development process, using Github tracker for issues and merging pull requests into master. If you want to contribute even something trivial please do not hesitate, but follow the guidelines below.
=== Sign the Contributor License Agreement Before we accept a non-trivial patch or pull request we will need you to sign the https://cla.pivotal.io/sign/spring[Contributor License Agreement]. Signing the contributor's agreement does not grant anyone commit rights to the main repository, but it does mean that we can accept your contributions, and you will get an author credit if we do. Active contributors might be asked to join the core team, and given the ability to merge pull requests.
=== Code of Conduct This project adheres to the Contributor Covenant https://github.com/spring-cloud/spring-cloud-build/blob/master/docs/src/main/asciidoc/code-of-conduct.adoc[code of conduct]. By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected]
=== Code Conventions and Housekeeping None of these is essential for a pull request, but they will all help. They can also be added after the original pull request but before a merge.
eclipse-code-formatter.xmlfile from the https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-dependencies-parent/eclipse-code-formatter.xml[Spring Cloud Build] project. If using IntelliJ, you can use the https://plugins.jetbrains.com/plugin/6546[Eclipse Code Formatter Plugin] to import the same file.
.javafiles to have a simple Javadoc class comment with at least an
@authortag identifying you, and preferably at least a paragraph on what the class is for.
.javafiles (copy from existing files in the project)
@authorto the .java files that you modify substantially (more than cosmetic changes).
Fixes gh-XXXXat the end of the commit message (where XXXX is the issue number).
=== Checkstyle
Spring Cloud Build comes with a set of checkstyle rules. You can find them in the
spring-cloud-build-toolsmodule. The most notable files under the module are:
└── src ├── checkstyle │ └── checkstyle-suppressions.xml <3> └── main └── resources ├── checkstyle-header.txt <2>
<1> Default Checkstyle rules <2> File header setup <3> Default suppression rules
==== Checkstyle configuration
Checkstyle rules are disabled by default. To add checkstyle to your project just define the following properties and plugins.
true <1> true <2> true <3>
<4> io.spring.javaformat spring-javaformat-maven-plugin <5> org.apache.maven.plugins maven-checkstyle-plugin
<5> org.apache.maven.plugins maven-checkstyle-plugin
<1> Fails the build upon Checkstyle errors <2> Fails the build upon Checkstyle violations <3> Checkstyle analyzes also the test sources <4> Add the Spring Java Format plugin that will reformat your code to pass most of the Checkstyle formatting rules <5> Add checkstyle plugin to your build and reporting phases
If you need to suppress some rules (e.g. line length needs to be longer), then it's enough for you to define a file under
${project.root}/src/checkstyle/checkstyle-suppressions.xmlwith your suppressions. Example:
<?xml version="1.0"?> <!DOCTYPE suppressions PUBLIC "-//Puppy Crawl//DTD Suppressions 1.1//EN" "https://www.puppycrawl.com/dtds/suppressions11.dtd">
It's advisable to copy the
${spring-cloud-build.rootFolder}/.editorconfigand
${spring-cloud-build.rootFolder}/.springformatto your project. That way, some default formatting rules will be applied. You can do so by running this script:
$ curl https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/.editorconfig -o .editorconfig $ touch .springformat
=== IDE setup
==== Intellij IDEA
In order to setup Intellij you should import our coding conventions, inspection profiles and set up the checkstyle plugin. The following files can be found in the https://github.com/spring-cloud/spring-cloud-build/tree/master/spring-cloud-build-tools[Spring Cloud Build] project.
└── src ├── checkstyle │ └── checkstyle-suppressions.xml <3> └── main └── resources ├── checkstyle-header.txt <2> ├── checkstyle.xml <1> └── intellij ├── IntellijProjectDefaults.xml <4>
<1> Default Checkstyle rules <2> File header setup <3> Default suppression rules <4> Project defaults for Intellij that apply most of Checkstyle rules <5> Project style conventions for Intellij that apply most of Checkstyle rules
.Code style
image::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/{spring-cloud-build-branch}/docs/src/main/asciidoc/images/intellij-code-style.png[Code style]
Go to
File->
Settings->
Editor->
Code style. There click on the icon next to the
Schemesection. There, click on the
Import Schemevalue and pick the
Intellij IDEA code style XMLoption. Import the
spring-cloud-build-tools/src/main/resources/intellij/Intellij_Spring_Boot_Java_Conventions.xmlfile.
.Inspection profiles
image::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/{spring-cloud-build-branch}/docs/src/main/asciidoc/images/intellij-inspections.png[Code style]
Go to
File->
Settings->
Editor->
Inspections. There click on the icon next to the
Profilesection. There, click on the
Import Profileand import the
spring-cloud-build-tools/src/main/resources/intellij/Intellij_Project_Defaults.xmlfile.
.Checkstyle
To have Intellij work with Checkstyle, you have to install the
Checkstyleplugin. It's advisable to also install the
Assertions2Assertjto automatically convert the JUnit assertions
image::https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/{spring-cloud-build-branch}/docs/src/main/asciidoc/images/intellij-checkstyle.png[Checkstyle]
Go to
File->
Settings->
Other settings->
Checkstyle. There click on the
+icon in the
Configuration filesection. There, you'll have to define where the checkstyle rules should be picked from. In the image above, we've picked the rules from the cloned Spring Cloud Build repository. However, you can point to the Spring Cloud Build's GitHub repository (e.g. for the
checkstyle.xml:
https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle.xml). We need to provide the following variables:
checkstyle.header.file- please point it to the Spring Cloud Build's,
spring-cloud-build-tools/src/main/resources/checkstyle-header.txtfile either in your cloned repo or via the
https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/main/resources/checkstyle-header.txtURL.
checkstyle.suppressions.file- default suppressions. Please point it to the Spring Cloud Build's,
spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xmlfile either in your cloned repo or via the
https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xmlURL.
checkstyle.additional.suppressions.file- this variable corresponds to suppressions in your local project. E.g. you're working on
spring-cloud-contract. Then point to the
project-root/src/checkstyle/checkstyle-suppressions.xmlfolder. Example for
spring-cloud-contractwould be:
/home/username/spring-cloud-contract/src/checkstyle/checkstyle-suppressions.xml.
IMPORTANT: Remember to set the
Scan Scopeto
All sourcessince we apply checkstyle rules for production and test sources.