WSO2 Microservices Framework for Java 2.0.0

Overview

Agenda

•  Introduction

•  Core Features

•  Performance

•  Deployment

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Introduction

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Microservices

•  Small independent processes achieving small tasks, which work together to ultimately compose a complex application

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Ref: http://martinfowler.com/articles/microservices/images/sketch.png

Microservices Architecture

•  Modular and composable

•  Easy to maintain - Components can be easily replaced and bugs in one component can be fixed without affecting others

•  Highly scalable

•  Easy deployment

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WSO2 Microservices Framework for Java

•  A lightweight, high performance framework for building microservices in Java

•  Simple Java based programming model with JAX-RS and Swagger based annotations

•  Fast boot up - microservices can be booted in a few milliseconds in a Docker container and can be easily added to a Docker image

•  Secures microservices leveraging JWT, BasicAuth and OAuth2 and has the capability to integrate with third-party authentication servers

•  Monitors microservices service behavior with analytics dashboards

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Vision of WSO2 MSF4J

•  Lightweight and fast runtime

•  Use Java annotations as a way of defining microservices APIs as well as met

•  Provide simple ways to develop and deploy microservices

•  Built-in metrics and analytics APIs with OOB integration with WSO2 Data Analytics Server (WSO2 DAS)

•  To be used in the WSO2 platform as a way of replacing all admin services as well as defining other microservices for inter-component interactions

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Implementation of WSO2 MSF4J

•  Based on the new WSO2 Carbon 5.0 Kernel

•  Transport is based on Netty 4.0

•  Supports streaming

•  High performance

•  9MB pack size

•  Starts within 300 ms

•  Less than 25 MB memory consumption for the framework

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Core Features

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Annotation-based Programming Model

•  Supports JAX-RS based annotations •  Class-level annotations

•  Method-level annotations

•  Parameter-level annotations

•  Lifecycle callback method annotations

•  Supports Swagger based annotations •  Enables generating Swagger API definition from a single API call

•  Humans and computers can discover and understand the capabilities of each service

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Spring-based Microservices

•  WSO2 MSF4J Supports a Spring-native development model with •  Dependency Injection (DI)

•  Standard configuration annotations (e.g. @Configuration, @Component, @AutoWired)

•  Makes it easy to bring in other 3rd party libraries & wire them in at runtime

•  For example those who are familiar with Spring-JPA can use the Spring-JPA library to integrate the Hibernate ORM framework with an WSO2 MSF4J service

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Server-less Execution

•  Supports server-less execution with fat JAR

•  Fat JAR is a JAR file with all dependencies in one fat (uber) JAR

•  Creating a fat JAR and running it in a Java process is referred to as server-less execution

•  Server-less execution does not involve unzipping a file and helps to start an app without a shell script

•  Supports service lifecycle methods

•  Easy to run within a container-friendly model

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Streaming

•  WSO2 MSF4J adopts an efficient model to handle Streaming Input (request messages) and Streaming Output (response messages)

•  Streaming Input - HTTP chunked requests can be handled in two ways:

•  Zero-copy method – Each chunk of a request is treated separately •  chunk() method is called when requests arrive •  finished () method is called after the last chunk arrives •  error () method called if an error occurs while processing the request

•  Chunk aggregation – Aggregates all chunks of the request and presents it as a full http request to the resource method

•  Streaming Output – Useful when handling large data volumes – no need to load into memory

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Custom Interceptors

•  Custom interceptors can be used to perform certain actions before or after a request arrives to resource methods

•  Custom interceptors should implement theorg.wso2.msf4j.Interceptor interface

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File Handling

•  Serve files from the resource methods by returning either of the following •  java.io.File •  java.io.InputStream •  javax.ws.rs.core.Response object with a java.io.File •  java.io.InputStream entity

•  Streaming is supported by default for java.io.File and java.io.InputStream entities

•  javax.ws.rs.core.StreamingOutput is also supported by WSO2 MSF4J - provides the service author more control over the chunk size

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Templates

•  Enables dynamic Web pages to be easily developed as microservices

•  Any data model can be easily rendered with a template and exposed as a REST service using this concept

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Exception Mapper

•  Supports JAXRS ExceptionMapper, which allows the creation of custom responses when exceptions are thrown from MSF4J services

•  The following code segment shows how ExceptionMappers are registered with the WSO2 MSF4J runtime:

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Circuit Breaker

•  Nygard's circuit breaker pattern is supported in

WSO2 MSF4J using the Netflix Hystrix library

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Thread Model

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Security

•  Security is done via a central server issuing JWT tokens

•  The JWTSecurityInterceptor verifies the signature, expiry and claims in the token

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Analytics and Monitoring

•  Supports annotations •  Timed – measures execution time •  Metered – measures rate of events •  Counted – counts the total number of invocations •  HTTPMonitored – monitors HTTP requests

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Metrics Output to Console

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JMX Metrics

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Dashboards

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Performance

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Deployment

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WSO2 Platform Deployment Options

o  Stand-­‐alone  servers  o  Private  clouds:    

e.g.  Stratos,  Kubernetes  o  Public  Clouds:    

e.g.  AWS  o  Hybrid  deployments    

o  Dedicated  hosKng  of  any  WSO2-­‐based  soluKons  

o  WSO2  operaKons  team  is  managing  the  deployment  and  keeps  it  running  

o  99.99%  upKme  SLA  o  Any  AWS  region  of  choice  o  Can  be  VPNed  to  local  network  o  Includes  monitoring,  backups,  

patching,  updates  

o  Shared  public  cloud,  o  Currently  available  for  applicaKon  and  

API  hosKng  (hosted  API  Manager  and  App  Factory),  

o  Preset  mulKtenant  deployment  in  AWS  US  East  run  by  WSO2,  

o  Month-­‐to-­‐month  credit  card  payment    

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