Load Balancer

Library for sending requests to different hosts with possible two algorithms of load balancing.

Installation

Use maven command from project root directory:

mvn clean install

Usage

Command line usage

From project target directory execute jar file

java -jar load-balancer-$version-jar-with-dependencies.jar --lbvariant $load_balancer_algorithm

Possible $load_balancer_algorithm values:

• round - sequentially rotation each of the hosts;
• weight - take the first host that has a load under 0.75, if all hosts are above 0.75 will take the one with the lowest load.

Request body will be read from console input and request process according to specified algorithm

Example: java -jar load-balancer-0.1-SNAPSHOT-jar-with-dependencies.jar --lbvariant round

Call from code as a service

Service class:

com.nkostiv.loadbalancer.LoadBalancerService

To use the service instance of this class should be created. Constructor – takes two arguments. The first argument is a list of host instances that should be load balanced. The second argument is the variant of load balancing algorithm to be used (round or weight). To send request for processoing method handleRequst(Request request) should be called.

##Implementation details In command line usage few servers already prepared with random load for demo purpose.

Open questions and assumtions

• Based on task description not clear about possible multithreading execution. From my point of view task done using minimum viable product approach.
• Was not implemented exception handling from a host and possibility that host not alive at all so list of hosts should be refreshed.