Groovy Scripting - Home.apache
Groovy Scripting
Why Scripting Languages? Some tasks are hard using Bash & friends The same tasks might be too small for afull-blown project Rapid feedback & bug fixing Many scripting languages around‣ Perl, Tcl, Python, Ruby
Getting Hooked On amel-gr8conf
Behind The Scenes Creates an Ivy repository in " /.groovy" Stores transitive dependencies Setup a Camel route using embedded Jetty Script executed by Groovy interpreter
Good Old Maven Way Write a pom.xml declaring dependencies Configure the “ AppAssembler MavenPlugin” to create a command lineapplication Maybe tinker with “Maven Ant Plugin” tocreate an executable shell script Upload/download distributable
The Side Project Useful but not important things Perfect for “bridging days” Stretch your skills Bring back the fun
Siegfried’s Side Project Automate test user documentation Set of test users changes every few months Each test users has one or more products‣ Account, credit cart, pension . Excel sheet created manually
The Problem At Hand User id for disposer “9422753404”? Any test user with a “Building Saving Plan”? When do we get the newest Excel sheet?
Idea Before Christmas Let’s make one QA guy happy Make a few REST calls to gather data Create a HTML document with that data Could be done for all test environments Let's implement it in Groovy
Groovy First Contact
Plans are only good intentionsunless they immediatelydegenerate into hard work.Peter Drucker
Hard Work Ahead Classes to hold a user and its products Implement command line parser Read user & credentials from a CSV file Invoke REST endpoints to get products Transform user and their products todocumentation
Groovy Classes
Groovy Classes
Grape Dependency Manager
Reading CSV
Groovy HTTPBuilder
Groovy HTTPBuilder
Groovy CLIBuilder
Groovy ConfigSlurper
Groovy JSONOutput
Where Are We Now? Holders for users and its products Using a command line parser Read user & credentials from a CSV file REST client to fetch user products JSON file containing user products
JSON To HTML
The Problem Ahead With XML I would use XSLT‣ Could somehow dump XML‣ XSLT is hard if you don't know it Maybe transform JSON to Markdown?‣ JSON & Markdown are everywhere
JSON To Markdown The cool kids say ‘node.js'‣ But they always say ‘node.js’ We could implement it in Groovy‣ Groovy’s MarkupBuilder looks hard‣ Using Apache Velocity & JSONPath?
Groovy Velocity CLI See https://github.com/sgoeschl/velocity-cli See https://github.com/jayway/JsonPath Wire Velocity templates with JSON Path Supports CSV & JSON transformations
GitHubREST APIExample
GitHub REST API
Groovy Velocity CLI
Groovy Velocity CLI
Groovy Velocity CLI
Test UserDocument
Groovlets Implement Java Servlets in Groovy Uses GroovyServlet to map servletrequest to Groovy scripts Usually deployed within servlet container But there is a simpler way
Groovlet Example
Things To Take Home
Things To Take Home Groovy is easy for Java developers Groovy is nice for non-trivial scripts Groovy works with your favourite libraries IDE allows debugging Groovy scripts The “Groovy Goodness Notebook”
Things To Take Home ASF top-level project Embedded in applications‣ SoapUI Groovy for integration‣ Spring Boot, Apache Camel Grails Web Framework
Questions & Answers
Resources der
Good Old Maven Way Write a pom.xml declaring dependencies Configure the “ AppAssembler Maven Plugin” to create a command line application Maybe tinker with “Maven Ant Plugin” to create a
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Dynamic programming with Groovy 9 1 Table of Contents . Part I: The Groovy language 1 Your way to Groovy 2 Overture: The Groovy basics 3 The simple Groovy datatypes 4 The collective Groovy datatypes 5 Working with closures 6 Groovy control structures 7 Object orientation, Groovy styl
Groovy compiles straight to Java bytecode. Java projects can contain anything from zero percent to one hundred percent Groovy. Groovy seamlessly and transparently integrates and interoperates with Java and any third-party libraries. Groovy is an agile and dynamic language that extends Java with scripting capabilities. It has a concise,
CDH: Cloudera’s Distribution Including Apache Hadoop Coordination Data Integration Fast Read/Write Access Languages / Compilers Workflow Scheduling Metadata APACHE ZOOKEEPER APACHE FLUME, APACHE SQOOP APACHE HBASE APACHE PIG, APACHE HIVE APACHE OOZIE APACHE OOZIE APACHE HIVE File System Mount UI
Using Groovy on a Java project Groovy has access to all java classes, in fact Groovy classes ARE Java classes and can be run by the JVM directly. If you are working on a Java project, using Groovy as a simple scripting language to interact with your java code is a no-brainer. To make things even better, nearly any Java class can be renamed to .
tions and developers are beginning to use Groovy at various levels on their projects, and I think the time is ripe for major Groovy adoption in the industry. Groovy version 1.5 was released on December 7, 2007. Grails ([Roc06], [Rud07]),7 built using Groovy and Java, is a dynamic web development framework based on “coding by convention.” It .
Groovy Roadmap Groovy 2.5 2.5.8 released Macros, AST transformation improvements, various misc. features JDK 7 minimum, runs on JDK 9/10/11 with warnings Groovy 3.0 Beta-3 out now, RC-1 in the next week or two, GA later in 2019 Parrot parser, various misc. features JDK 8 minimum, address most JDK 9/10/11 issues Groovy 4.0 Alphas out soon
Visual Builder Groovy Scripting Reference Chapter 1 Introduction 1 Introduction Groovy is a standard, dynamic scripting language for the Java platform for which Visual Builder provides deep support. This document explains the basics of how you will use the Groovy scripting language to enhance your applications.
