Hoplin does not have any dependencies on any existing metrics libraries but rather it provides a way to hook into the underlying metrics via MetricsPublisher interface. Metrics expose a number of key/value pairs that are updated and send to metrics consumers. Depending on which client we use the metrics key will be different and it …
There are times when we want to fire set of jobs and be notified when all of them complete. This can be easily accomplished with the latest version of Hoplin.io RabbitMQ client. A use case for using batch messages would be partitioning a document and processing each partition via separate client. As always we need …
A lightweight RabbitMQ client for Java (built on top of rabittmq java client) Documentation and project available at GitHub repohttps://github.com/gregbugaj/hoplin.io To make working with RabbitMQ as simple as possible with minimum dependencies. Minimal dependencies, simple configuration and API. Subscriber client Publisher client Async RPC Client Creating simple RabbitMQ client can be done in couple different …
hoplin.io A lightweight RabbitMQ client for Java (built on top of rabittmq java client) Read More »
Here we will create Data retrieval service with exponential backoff that we covered in the previous post. Implementation package com.rms.blueprint.data; import java.util.Date; import java.util.Objects; import java.util.concurrent.TimeUnit; import java.util.function.Function; import java.util.function.ObjLongConsumer; import java.util.function.Supplier; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class DataRetrievalWithBackoff implements Runnable { public final Logger LOGGER = LoggerFactory.getLogger(DataRetrievalWithBackoff.class); private final …
Since the beginning of this project, I have learned many lessons. First of all the syntax of the language was to closely related to SQL, as this was the language that I wanted to mimic and fit into this framework. Main reason for that was that I wanted something familiar to the end user, I …
This is a method to generate a long id in the positive space. There are few issues to consider with this method – UUID is 16 bytes / 128 bits – Long is 8 bytes / 64 bits This means that we will loose some information, if we don’t want to lose that we could …
Somehow I am getting problems starting Jetty via service jetty start We will be using unix command called nohup “Nohup is a unix command, used to start another program, in such a way that it does not terminate when the parent process is terminated.” I have opted out for using this nohup java -jar start.jar …
Taking a heap dump from console when Java VisualVM and JMX is not available to us. We will use following tools jmap jps ps Dumping heap requires two steps 1) Obtaining target process id 2) Dumping heap for given pid First we need to obtain the target process id we would like to dump, here I …
Taking heap dump of java process on linux and windows Read More »
Calculate centroid of 2D non crossing polygon,To accommodate that points are correct using Gift wrapping algorithm(Finding Convex Hull) Test case import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertNotNull; import java.awt.Point; import java.util.ArrayList; import java.util.Arrays; import java.util.List; import org.junit.Test; public class MathUtilTest { @Test public void computeCentroidWithHull() { Point p1 = new Point(1, 1); Point p2 = new …
Find Convex hull of given points using Gift wrapping algorithm This is implementation of Grift wrapping algorithm for finding convex hull. private static final Integer ZERO = new Integer(0); /** * Find Convex hull of given points * * @ref http://en.wikipedia.org/wiki/Gift_wrapping_algorithm * @param vertices * @return */ private static List<Point> findConvexHull(final List<Point> …
Find Convex hull of given points using Gift wrapping algorithm Read More »
