Groovy Powered Clean Code
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"Clean Code" by Bob Martin is probably one of the most important practical documents out there; A must read for all developers, if you will. In this talk I will show how you can use Groovy and its rich ecosystem to apply the discussed principals, thus cleaning and vastly improving your codebase while still maintaining your sanity and joy. By Noam Tenne
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Groovy Powered Clean Code
- 1. GROOVY POWERED CLEAN CODE Noam Tenne
- 2. $WHOAMI Developing on the JVM for the past 13 years codefresh.io Altogether standup guy @NoamTenne blog.10ne.org
- 3. CODEFRESH.IO Docker oriented CI/CD that goes to 11
- 4. CODEFRESH.IO Build your services as Docker images (You don’t even need a Dockerfile)
- 5. CODEFRESH.IO Instantly launch your services (Solo or part of a composition)
- 6. “Writing clean code is what you must do in order to call yourself a professional.” –Robert C. Martin http://www.amazon.com/dp/0132350882/ref=cm_sw_r_tw_dp_GuZ2wb1ZS9GXP
- 7. WHICH ONE ISYOUR CODE REVIEW?
- 11. COMMENTS //Construct object, obviously def object = new Obvious()
- 12. OBJECTSVS. DATA-STRUCTS planetSmasher.getPlanetContext().planet = "Earth" planetSmasher.smash()
- 13. ERROR HANDLING catch (Exception e) { //noop }
- 16. HUMANS
- 18. <ENTER GR8BEER>
- 19. WHAT MAKES GROOVY CLEAN?
- 21. ScriptEngineManager sem = new ScriptEngineManager(); ScriptEngine jse = sem.getEngineByName("javascript"); String script = "Java.asJSONCompatible(" + json + ")"; Object rawJsonObject = javascriptEngine.eval(script); Map contents = (Map) rawJsonObject;
- 22. Nashorn?
- 23. import groovy.json.JsonSlurper … def contents = new JsonSlurper().parse(json)
- 25. String html = "<html>"; html += "<head>"; html += "<title>Noam's guide to Copenhagen</title>"; html += "</head>"; ... html += "</body>"; html += "</html>";
- 27. new MarkupBuilder(it).html { head { title("Noam's Guide To Copenhagen") } body { ... } }
- 28. DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); Document doc = docBuilder.newDocument(); Element rootElement = doc.createElement("gah"); doc.appendChild(rootElement);
- 31. def xml = new MarkupBuilder() xml.guide(type:"guide"){ title("Noam's Guide To Copenhagen") }
- 33. def json = new JsonBuilder() def root = json { title "Noam's Guide To Copenhagen" } json.toString()
- 35. private void readTheStream() { URI.create("gr8conf.eu").toURL().openStream(); } throws IOException
- 36. private void readTheStream() { URI.create("gr8conf.eu").toURL().openStream(); }
- 37. WHAT MAKES GROOVY REALLY CLEAN?
- 38. import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; … Reader isr = new InputStreamReader(it);
- 40. def isr = new InputStreamReader(it);
- 42. DEFAULT IMPORTS import java.lang.* import java.util.* import java.io.* import java.net.* import groovy.lang.* import groovy.util.* import java.math.BigInteger import java.math.BigDecimal
- 43. import org.slf4j.* import groovy.util.logging.Slf4j @Slf4j class GroovyDoge { public static void main(String[] args) { log.info "Wow! Much Groovy! So Log!" } }
- 44. ASTTRANSFORMATION 1. Initialization 2. Parsing 3. Conversion 4. Semantic Analysis 5. Canonicalization 6. Instruction Selection 7. Class Generation 8. Output 9. Finalization
- 45. List list = [] assert list instanceof java.util.ArrayList list.plus([])
- 46. REGISTERED META METHODS POGO Metaclass MetaclassRegistry
- 48. def fileContents = Paths.get('/path/to/file').text
- 49. EXTENSION MODULES class MyExtension { public static String asString(Integer target) { ... } }
- 50. EXTENSION MODULES class MyExtension { public static String asString(Integer target) { ... } } Register the class with a descriptor in META-INF/services
- 51. EXTENSION MODULES class MyExtension { public static String asString(Integer target) { ... } } Register the class with a descriptor in META-INF/services
- 52. EXTENSION MODULES class MyExtension { public static String asString(Integer target) { ... } } Register the class with a descriptor in META-INF/services 1337.asString()
- 53. SCRIPTS def message = "Much script! Wow! So code!" println message
- 54. SCRIPTS import org.codehaus.groovy.runtime.InvokerHelper class DogeScript extends Script { def run() { def message = "Much script! Wow! So code!" println message } static void main(String[] args) { InvokerHelper.runScript(DogeScript, args) } }
- 55. SCRIPTS
- 56. LANGUAGE
- 57. QUESTIONS?
- 58. TAK!