This is the summary of Google Summer Of Code 2016, Week One.

Objectives

In this week, I’m planning to do the following stuff:

  • Refine the code and document of Vert.x Blueprint - Todo Backend
  • Work on the Vert.x Blueprint - Kue (Basic Design)

Issues

How to use Vert.x Codegen with Gradle

We need to understand the essence of Vert.x Codegen - an APT(annotation processing tool), so we could write a task to do processing:

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task annotationProcessing(type: JavaCompile, group: 'build') {
  source = sourceSets.main.java
  classpath = configurations.compile
  destinationDir = project.file('src/main/generated')
  options.compilerArgs = [
    "-proc:only",
    "-processor", "io.vertx.codegen.CodeGenProcessor",
    "-AoutputDirectory=${project.projectDir}/src/main"
  ]
}

And in compileJava we reference the annotationProcessing task:

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compileJava {
  targetCompatibility = 1.8
  sourceCompatibility = 1.8

  dependsOn annotationProcessing
}

sourceSets {
  main {
    java {
      srcDirs += 'src/main/generated'
    }
  }
}

Then we could process the annotations with Gradle~

The Chinese version is here: 在 Gradle 中使用Annotation Processing Tool | Vert.x Codegen 示例

Achievement

Because there were many temporary experiments last week, I didn’t work during Friday to Sunday. Here are achievements of this week:

Finished the Vert.x Blueprint - Todo Backend project

Basic design of Vert.x Kue

In Kue(Node.js), we use kue.createQueue() to create a Kue instance and then use create(type, data) to create a job and then save the job to Redis. After that, we invoke job.process(type, callback) to process the job.

And in my design of Vert.x Kue, I designed a KueService that provide basic functions and wrapped a class Kue like Queue in Node.js version. I use Vert.x Service Proxy and register it to a KueVerticle. Our user could create a custom verticle(e.g. ExampleVerticle) and create and process jon via Kue class.

As for processing jobs, I’m planning to use Worker Verticles or just use executeBlocking method.

Learned something about Microservice

  • Microservice patterns(Quorum, Circuit Breaker Pattern, Compensating Transaction Pattern, etc.)
  • Usage and reactive thoughts of Netflix Hystrix