Asynchronous approaches in Java

Video report about the evolution on asynchronous approaches in Java
29 August 2017   467

In this video, we will observe the evolution on asynchronous approaches in Java.

You will learn:

  • the concept of Reactive programming.
  • observe the necessary historical infrastructure evolved starting from the early Java.
  • how to use the new but forgotten Java 8 out of the box API CompletableFuture for reactive approach in java programming and unlock a better multithreading performance in intuitive way

About the speaker - Dmitry Aleksandrov. Currently Principal Expert-Developer at T-Systems, Bulgarian JUG co-lead, conference co-org. Over one decade experience in Java Enterprise in areas like Banking, Insurance and Telecoms. But still very interested in dynamic languages on JVM and massive computations.

What is Web3j?

Small review of lightweight Java and Android library for integration with Ethereum clients
15 December 2017   833

What is webj3?

web3j is a lightweight, highly modular, reactive, type safe Java and Android library for working with Smart Contracts and integrating with clients (nodes) on the Ethereum network:

web3j architecture
Web3j Architecture

This allows you to work with the Ethereum blockchain, without the additional overhead of having to write your own integration code for the platform.

According to the developers, these are the features:

  • Complete implementation of Ethereum's JSON-RPC client API over HTTP and IPC
  • Ethereum wallet support
  • Auto-generation of Java smart contract wrappers to create, deploy, transact with and call smart contracts from native Java code (Solidity and Truffle definition formats supported)
  • Reactive-functional API for working with filters
  • Ethereum Name Service (ENS) support
  • Support for Parity's Personal, and Geth's Personal client APIs
  • Support for Infura, so you don't have to run an Ethereum client yourself
  • Comprehensive integration tests demonstrating a number of the above scenarios
  • Command line tools
  • Android compatible
  • Support for JP Morgan's Quorum via web3j-quorum

It has five runtime dependencies:

  • RxJava for its reactive-functional API
  • OKHttp for HTTP connections
  • Jackson Core for fast JSON serialisation/deserialisation
  • Bouncy Castle (Spongy Castle on Android) for crypto
  • Jnr-unixsocket for *nix IPC (not available on Android)

It also uses JavaPoet for generating smart contract wrappers.

Lear more at GitHub.