danveloper’s gists

danveloper / convert.sh

Last active December 5, 2018 18:51

Java to Groovy converter in bash!!

danveloper / Promises.java

Created April 16, 2013 19:40

Java 8 CompletableFuture (Promise) and Lambda example

	public class Promises {
	private static class PageMetrics {
	Integer visits;
	Long avgMsOnPage;


	@Override
	public String toString() {
	return String.format("{ avgMsOnPage=%d, visits=%d }", avgMsOnPage, visits);
	}

danveloper / MemoizedLambdaFib.java

Last active December 16, 2015 08:19

Memoized Fibonacci calculation using lambdas in Java 8

	public class MemoizedLambdaFib {
	interface MemoizedFunction<T, R> {
	enum Cache {
	_;

	Map<Object, Object> vals = new HashMap<>();
	}

	R calc(T t);

danveloper / TrampolineLambda.java

Created April 18, 2013 18:27

Trampoline in Java 8 with Lambdas and interface defaults

	public class TrampolineLambda {
	interface TrampolineFunction<T, R> {
	R apply(T...obj);

	public default Object trampoline(T...objs) {
	Object result = apply(objs);
	if (!(result instanceof TrampolineFunction)) {
	return result;
	} else {
	return this;

danveloper / ImprovedNamingDescriptorCustomizer.java

Created May 6, 2013 05:53

EclipseLink class descriptor customizer that mimics Hibernate's ImprovedNamingStrategy for table and field naming

	public class ImprovedNamingDescriptorCustomizer implements DescriptorCustomizer {
	@Override
	public void customize(ClassDescriptor classDescriptor) throws Exception {
	String className = classDescriptor.getJavaClassName();
	String shortName = Helper.getShortClassName(className);
	String improvedName = toImprovedName(shortName);

	classDescriptor.setTableName(improvedName);

	updateMappings(classDescriptor, improvedName);

danveloper / ApplicationConfiguration.groovy

Last active December 17, 2015 14:19

Groovy Configuration DSL for environment properties in Spring

	package com.danveloper.reactor.config

	reactor {
	social {
	twitter {
	consumerKey = "ABCD"
	consumerSecret = "EFGH"
	accessToken = "IJKL"
	accessTokenSecret = "MNOP"
	}

danveloper / AppConfig.groovy

Created May 22, 2013 16:31

Accessing Grails Configuration with Spring Property Placeholders

	package com.objectpartners.application.config

	config {
	social {
	twitter {
	consumerKey = "ABCD"
	consumerSecret = "EFGH"
	accessToken = "IJKL"
	accessTokenSecret = "MNOP"
	}

danveloper / DataModel.groovy

Created May 29, 2013 17:54

Introduction - "Redefining the Service Layer with Groovy Categories"

	class Payee {
	String name
	String phoneNumber
	Address billingAddress
	}

	public interface PaymentType {
	Payee getPayee();
	}

danveloper / Service.groovy

Created May 29, 2013 18:08

Expansion - "Redefining the Service Layer with Groovy Categories"

	class LocalPaymentService implements PaymentService {

	// Dependency injected from container
	CreditCardPaymentGateway creditCardPaymentGateway
	GiftCardPaymentGateway giftCardPaymentGateway
	CheckPaymentGateway checkPaymentGateway
	EmployeePaymentGateway employeePaymentGateway

	public String process(PaymentType paymentType) throws IllegalArgumentException {
	if (paymentType instanceof CreditCardPaymentType) {

danveloper / Service.groovy

Created May 29, 2013 18:12

Fragility - "Redefining the Service Layer with Groovy Categories"

	class LocalPaymentService implements PaymentService {

	// Dependency injected from container
	CreditCardPaymentGateway creditCardPaymentGateway
	GiftCardPaymentGateway giftCardPaymentGateway
	CheckPaymentGateway checkPaymentGateway
	EmployeePaymentGateway employeePaymentGateway

	public String process(PaymentType paymentType) throws IllegalArgumentException {
	if (paymentType instanceof CreditCardPaymentType) {

Dan Woods danveloper