SelfAwarePotato

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String Encodings? Unicode? ASCII? UTF-8? ãéîöû?

Setup Hadoop on Mac using HomeBrew - July 2020

Enjoy quickies with supplyAsync by knowing how to handle exceptions.

Singletons!

A Generic method to convert ResultSetFuture (of Datastax Java driver for Cassandra) to a list of table-row-model(POJO) for any table query

Converting google/guava ListenableFuture to Java 8 CompletableFuture

Euler Path in a graph using Hierholzer's algorithm

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Converting google/guava ListenableFuture to Java 8 CompletableFuture

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Java was a bit late in bringing Javascript's promise-like functionality. Future was there but wasn't as cool. So people at google made ListenableFuture . Now that java has CompletableFuture , it is common to run into problems like converting a ListenableFuture to a CompletableFuture. This can be because part of your older code uses ListenableFuture and now you have to compose your new logics utilising the newer and Java native technique. Following is one possible way to do it. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 public class FutureConverter { public static CompletableFuture toCompletableFuture ( ListenableFuture listenableFuture ) { final CompletableFuture completableFuture = new CompletableFuture (); Futures . addCallback ( listenableFuture , new FutureCallback () { public void onFailure ( Throwable throwable ) { completableFuture . completeException
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A Generic method to convert ResultSetFuture (of Datastax Java driver for Cassandra) to a list of table-row-model(POJO) for any table query

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This post shows my new found love for CompletableFuture , lamdba expression and Streams API in Java. Problem: You do an async query on a table, get a ResultSetFuture object and need to populate a list of java objects representing a row in Cassandra table. A normal way to do this would be Assume: ResultSetFuture rsf = resultFromSomeTableQuery(); ResultSet rs = rsf.get(); //get ResultSet from rsf get all rows as list by rs.all() now for each Row in above list create a new object(POJO/java object representing table row) and populate the new object by calling Row.get(column index) for each column. This would lead to writing new code which does same task of converting ResultSetFuture to List of POJOs for each table query. Solution: I'll give my solution approach with an example
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