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Phil (aka MP3Monster)'s Blog

~ from Technology to Music

Phil (aka MP3Monster)'s Blog

Tag Archives: Technology

Node (npm) package licensing

05 Tuesday Jul 2022

Posted by mp3monster in development, General, node.js, Technology

≈ Leave a comment

Tags

code, developer, development, Licensing, node.js, package, Technology

When building Node solutions, even if you’re not going to publish the code to a public repository you’re likely to be using package.json to declare the dependencies for your app. Doing this makes it easier to build and deploy a utility. But if you’re conversant with several languages there is a tendency to just adapt your existing skills to work with others. The downside of this is small tooling nuances can catch you off guard and consume time while figuring them out. The workings of packages with NPM (as shown below) is one possible case.

{
  "name": "graph-svr",
  "version": "1.0.0",
  "description": "packages needed for this service",
  "main": "index.js",
  "type": "module",
  "scripts": {
    "start": "node index.js"
  },
  "dependencies": {
    "@graphql-tools/graphql-file-loader": "^7.3.11",
    "@graphql-tools/load-files": "^6.5.4",
    "@graphql-tools/schema": "^8.3.10",
    "@graphql-yoga/node": "^2.4.1",
    "apollo-datasource-rest": "^3.5.2",
    "apollo-server": "^3.6.7",
    "graphql": "^16.4.0",
    "graphql-tools": "^8.2.8"
  },
  "author": "Phil Wilkins",
  "license": "MIT"
}

If you create the package.json using npm init to create the initial version of the file, it is fairly common to set values to default. In the case of the license, this is an ISC license. This is easily forgotten. The problem here is twofold:

  • Does the license set reflect the constraints of the dependencies and their licenses
  • Does the default license reflect the position you want?

Looking at the latter point first, This is important as organizations have matured (and tooling greatly improved) when it comes to understanding how open source licensing can impact. This is particularly important for any organizations leveraging open source as part of their revenue generating activities either ‘as a service’ but also selling software solutions. If you put the wrong license here the license checking tools often protecting code repositories may reject your code, even in internal only use cases (yes this tripped me up).

To help overcome this issue you can install a tool that will analyze the dependencies and optionally their dependencies and report back on your license exposure. This tool is called license-report. Once installed (npm install -g license-report) we just need to point the tool to the package.json file. e.g. license-report package.json. We can make the results a lot more consumable by outputting the content in a number of formats. For example a simple text value:

From this, you could set your license declaration in package.json or validate that your preferred license won’t conflict,

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Apollo GraphQL – some pointers

16 Thursday Jun 2022

Posted by mp3monster in development, General, languages, node.js, Technology

≈ 2 Comments

Tags

API, code, development, GraphQL, javascript, node.js, Technology

I’ve designed a variety of GraphQL schemas and developed microservice backends. But not done much with configuring the Apollo implementation of a GraphQL server until recently. This may reflect the fact my understanding of JavaScript doesn’t extend into the world of Node.JS as much as I’d like (the problem with being a multi-language developer is you’re likely to find your way around many languages but never be a master of one). Anyway, the following content is about the implementation within a GraphQL server part of a solution. It may be these pointers are just for my benefit you might find them helpful as well.

Read more: Apollo GraphQL – some pointers

To make it easy to reference the code, we’ve added entries (n) into the code, where n is a number. This is not part of the code. But there to make the different lines referenceable. Where code should go but is not relevant to the point being made I’ve added ellipsis (…)

Dynamic loading and server configuration

import { ApolloServer } from 'apollo-server';
import { loadFilesSync } from '@graphql-tools/load-files';
import { resolvers } from './resolvers.js';   (1)
import ProviderInternalAPI from './ProviderInternalAPI.js'; (1)
import EventsInternalAPI from './EventsInternalAPI.js';  (1)
const server = new ApolloServer({
  debug : true,    (2)
  typeDefs: loadFilesSync('./schema.graphql'),   (3)
  resolvers,
  dataSources: () => {
    return {
      eventsInternalAPI: new EventsInternalAPI(),    (4)
      providerInternalAPI: new ProviderInternalAPI() (4)
      pro
    };
  }});

There is the potential to dynamically load the resolvers rather than importing each JavaScript file as we see on lines (1). The mechanics to do this is documented here. It would be cool if an opinionated implementation was provided. As shown by (3) we can take a independent schema file being loaded. The Apollo example approach for this didn’t seem to work for us, although both approaches make use of graphql-tools in a synchronous manner.

We can switch on debugging (2) for the GraphQL server, although the level of information published doesn’t appear to be significant. Ideally this setting is changed for production.

Defining the resolvers

The prefix for each resolver (1) must correlate to the name in the schema of the mutator or query (not the type as you would expect with Java). Often we don’t need all the parameters for the resolver. The documentation describes replacing each unused parameter with one or more underscores (i.e _, __ ). The underscore denoting the field not in use. However we can satisfy the indication of not being used, but keep the meaning of each position by using the underscore then a name (i.e. _parent, _args ) as shown in (2).

By taking the response into a variable (3) we can optionally log it. Trying to return using invocation line would result in the handler object rather than the payload itself. By taking the result into a variable we can log the content if desired and return the content.

The use of the backward quote is a node feature. It allows us to incorporate variables into a string by referencing it within ${} (4).

We need to supply the GraphQL server with instances with a layer of code that will interact with the resolvers. We can instantiate the instances in the declaration. The naming of the object is important (4) to the resolver.js (declarations).

import { useLogger } from "@graphql-yoga/node";
...
latestEvent (1): async (_parent, _args, { dataSources }, _info) (2)   => {
      if (log) { console.log("resolvers - get latest event"); }
      let responseValue = await dataSources.eventsInternalAPI.getLatestEvent(); (3)
      if (log) { console.log(`(4)  Resolver response for latest event:\n ${responseValue}`); }
      return responseValue;
    },

Resolver declarations

 Query: {  ...
 },
  
Mutation: {...
},
  Event: {  (1)
    providers: (event, args, { dataSources }, info) => {
      if (log) { console.log(`going to locate ${event.sources}`) }
      let responseValue = await (2) dataSources.providerInternalAPI.getProviders(event.sources);
      return responseValue;
    }

To handle the use of resolvers within a larger resolver we need to declare the resolution outside of the Query and Mutator blocks (but inside the whole declaration block)(1). The name provided needs to match the parent entity that the query resolver contributes to.

To then provide values from the outer resolution we need to prover to the chained resolution use the naming as represented in the GraphQL schema as shown by (2). The GraphQL engine will resolve the mapping values.

Web resolver URL

  // GET
  async getProvider(code) {
    console.log("getProvider (%s) directing to %s",code,this.baseURL);
    return this.get(`provider?code=${code} (1)`);
  }

The URL parameters need to be appended to the base URL path for the parent class to use in the invocation as shown by (1). The Apollo examples showed a setter option but we didn’t see the URI being addressed properly. This approach produces the relevant requirement.

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Container Registry – pushing and storing containers

12 Thursday May 2022

Posted by mp3monster in Cloud Native, General, Oracle, Oracle Cloud Native, Technology

≈ 2 Comments

Tags

container, development, Docker, Kubernetes, OCIR, OKE, Oracle, registry, Technology

A container registry is as essential as a Kubernetes service as you want to manage the deployable resources. That registry could be the public Docker repository or something else. In most people’s cases, the registry needs to be private as you don’t want to expose your product assets to potential external tampering. As a result, we need a service such as Oracle’s container registry OCIR.

The re of this blog is going to walk through how to push a container you’ve built into OCIR and a gotcha that can trip up users if you make assumptions about how the registry works.

Build container

Let’s assume you’re building your microservices locally or retrieving vetting 3rd party services for use. In both cases, you want to manually push your assets into OCIR manually rather than have an automated build pipeline do it for you.

To make it easier to see what is happening, we can exploit some code from Oracle’s Github repo (such as this piece being developed) or you could use the classic hello world container (https://github.com/whotutorials/docker-busybox-hello-world/blob/master/Dockerfile). For the rest of the post, we’ll assume it is the code developed for the Oracle Architecture Center-provided code.

docker build -t event-data-svc .

This creates a container locally, and we can see the container listed using the command:

docker images

Setup of OCIR

We need an OCIR to target so the easiest thing is to manually create an OCIR instance in one of the regions, for the sake of this illustration we’ll use Ashburn (short code is IAD). To help with the visibility we can put the registry in a separate compartment as a child of the root. Let’s assume we’re going to call the registry GraphQL. So before creating your OCIR set up the compartment as necessary.

fragment of the compartment hierarchy

In the screenshot, you can see I’ve created a registry, which is very quick and easy in the UI (in the menu it’s in the Developer Services section).

The Oracle meu to navigate to the OCIR service
the UI to create a OCIR

Finally, we click on the button to create the specific OCIR.

Deployment…

Having created the image, and with a repo ready we can start the steps of pushing the container to OCIR.

The next step is to tag the created image. This has to be done carefully as the tag needs to reflect where the image is going using the formula <region name>/<tenancy name/<registry name>:<version>. All the registries will be addressed by <region short code>.ocir.io In our case, it would be iad.ocir.io.

docker tag graph-svr:latest iad.ocir.io/ociobenablement/graphql-svr:v0.1-dev

As you may have realized the tag being applied effectively tells OCI which instance of OCIR to place the container in. Getting this wrong can be the core of the gotcha previously mentioned and we’ll elaborate upon it shortly.

To sign in you’ll need an auth token as that is passed as the password. For simplicity, I’ve passed the token in the docker command, which Docker will warn you of as being insecure, and suggest it is passed in as part of a prompt. Note my token will have been changed by the time this is published. The username is built on the structure of <cloud tenancy name>/identitycloudservice/<username>. The identitycloudservice piece only needs to be included for your authentication is managed through IDCS, as is the case here. The final bit is the URI for the appropriate regional OCIR address, as we’ve used previously.

docker login -u ociobenablement/identitycloudservice/philip.wilkins@oracle.com -p XXXXXXXXXXX  iad.ocir.io

With hopefully a successful authentication response we can push the container. It is worth noting that the Docker authenticated connection will timeout which is why we’ve put everything in place before connecting. The push command is very simple, it is the tag name assigned to the artifact including the version number.

docker push iad.ocir.io/ociobenablement/graphql/graph-svr:v0.1-dev
OCIR with several versions of a container

Avoiding the gotcha

When we deal with repositories from Git to SVN or Apache Archiva to Nexus we work with a repository that holds multiple different assets with multiple versions of those assets. as a result, when we identify an asset uniquely we would expect to name things based on server/location, repository, asset name, and version. However, here each repository is designed for one type of asset but multiple versions. In reality, a Docker repository works in the same manner (but the extended path impact is different).

This means it becomes easy to accidentally define a tag with an extra element. Depending upon your OCI tenancy privileges if you get the path wrong, OCI creates a new root compartment container repository with a name that is a composite of the name elements after the tenancy and puts your artifact in that repository, not the one you expected.

We can address this in several ways, first and probably the best option is to automate the process of loading assets into OCIR, once the process is correct, it will remain correct. Another is to adopt a principle of never holding repositories at the root of a tenancy, which means you can then explicitly remove the permissions to create repositories in that compartment (you’ll need to explicitly grant the permissions elsewhere in the compartment hierarchy because of policy inheritance. This will result in the process of pushing a container to fail because of privileges if the tag is wrong.

Visual representation of structure differences

Repository Structure
Registry Structure

Condensed to a simple script

These steps can be condensed to a simple platform neutral script as follows:

docker build -t event-data-svc .
docker tag event-data-svc:latest iad.ocir.io/ociobenablement/event-data-svc:latest

docker login -u ociobenablement/identitycloudservice/philip.wilkins@oracle.com -p XXXXX  iad.ocir.io
docker push iad.ocir.io/ociobenablement/event-data-svc:latest

This script would need modifying for each container being built, but you could easily make it parameterized or configuration drive.

A Note on Registry Standards

Oracle’s Container Registry has adopted the Open Registries standard for OCIR. Open Registries come under the Linux Foundation‘s governance. This standard has been adopted by all the major hyperscalers (Google, AWS, Azure, etc). All the technical spec information for the standard is published through GitHub rather than the main website.

References

  • Push an Image to Oracle Cloud Infrastructure Registry
  • Notes about Repository Creation
  • Creating a Container Registry
  • Open Registries
  • Policies to Control Repository Access

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The Air Gap a Security Fallacy?

12 Saturday Jun 2021

Posted by mp3monster in General, Technology

≈ Leave a comment

Tags

Security, software, Technology

Securing systems through an air gap is an idea goes back decades, and through the 50s to as recently as the 2000s the idea that you could safely and successfully run and maintain systems by simply not connecting to a network protects them from vulnerabilities may have been true. But in the last ten or more years, I would argue it is a fallacy, that can lull people into a false sense of security and therefore more likely to take more risks (or at least not be as careful as we should be). This idea is a well established piece of psychology with modern cars (here for example). This is known as Risk Compensation (also more here) or an aspect of behaviour adaptation.

Whilst this is rather theoretical, perhaps we should illustrate in practical terms why it is both a fallacy, and in the modern day simply impractical.

Continue reading →

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EMEA PaaS Forum 2019 in review

15 Monday Apr 2019

Posted by mp3monster in General

≈ 1 Comment

Tags

Ace, Capgemini, Cloud, conference, development, drone, Luis Weir, meetup, Oracle, PaaS, Presentation, Technology

Image by @motivcx

Image by @motivcx

Another Spring means another excellent Oracle EMEA PaaS Forum for Oracle partners. Every Year Juergen Kress organizes the event, finding really nice venues to host several hundred people over four and half days.

The event is split into several parts,  Monday afternoon normally involves Oracle Ace’s presenting on best practices, insights on applying the various technologies etc.  For me this meant presenting on the London Developer Meetup, looking at how it worked, what has been successful, and what hasn’t.  For those know have read my blogs on the subject (here) will know about our Drone initiative.

Meetups – The Oracle Ace Way from Phil Wilkins

Picture by @AmyGrangeX

Then Tuesday is a single stream day where Juergen has managed to pull in SVPs and Senior Product Managers from around the globe to provide a high-level view of what has been going on with their products. For anyone consulting in the Oracle domain, this is incredibly useful. For example, there is a clear strategy coalescing around AI and Machine Learning both as a service proposition to users, but also how these technologies are being made available and used within other products.  Other areas such as OIC and SOA CS have stability and maturity, and the road map is about maximising connectivity with the newer products.

But before the sessions start, Juergen starts with opening remarks, and demos’ something engaging.  In previous years this has been things like Digital Assistants/Chatbots and so on.  This year, we have been fortunate to be an active contributor by demoing the drone through the use of APIs and talking about the ideas.  The dry runs of the demo on Monday went without a problem, but when it came to the main show, the drone was a little uncooperative – we think because the air-con had really kicked in.  But importantly, even not achieving the desired result, the message of engagement made it home.

Wednesday is split into streams with in-depth sessions from the different Product Managers, he amount of insight gained from these sessions is tremendous, some of which is very much protected by safe harbour statements or not for public disclosure such is the honest and open discussions. The day closes with an Ace Director initiative which demonstrates the application of Oracle Cloud products to a plausible use case, and Luis Weir (Capgemini Oracle CTO) is part of. This session has become something of a tradition now.

The day’s business concludes awards, and for a second year the UK Capgemini team have taken home two awards for APIs and PaaS Contribution.

Luis Weir with his API award

The final two days are then a choice of Hackerthon or 1/2 day training sessions on different products with the relevant Product Managers, and an excellent opportunity to pick the brains of the presenters as well as get hands-on experience with the different products.

The week isn’t without it’s social and networking activities of course …

39.506174
2.532125

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Building Evolutionary Architectures

16 Saturday Mar 2019

Posted by mp3monster in Book Reviews, Books, General, Technology

≈ Leave a comment

Tags

architecture, book, evolutionary, mindmap, review, Technology

I have been working my way through Building Evolutionary Architectures by Neal Forward, Rebecca Parsons and Patrick Kua. Three senior and respected members of Thoughtworks (also the home of Martin Fowler). Having read and listened to Neal and Rebecca’s presentations and writing I had expected a deeply thought-provoking read, but have to admit to being disappointed. There are some good points without a doubt, but the book pretty much focuses on one idea, the application of fitness functions. But I’m not convinced it warrants several hundred pages of a book as a result the point does at times feel laboured.

There are some arguments made, that leaves me thinking that there is a view that the only answer is microservices in the conventional model of Kubernetes, Docker etc, which I agree is a powerful paradigm to allow solutions to evolve, but it isn’t a silver bullet and not always right in every case (if you have a team lacking the underlying appreciation of the goals, or put in to place in an ad-hoc manner (see Chris Richardson‘s work) it isn’t going to help.

Alongside this, there is little said about the interface definition for microservices (typically APIs of one form or another). Whilst mention of leaky abstractions are made, the material illustrations such as code lead API definitions are omitted (risk being, code changes, the API changes and the impact cascades).

What surprised me the most is the on more than one occasion the books points to ERPs not being sufficiently customisable. Yet, anyone working with ERPs will tell you that ERPs are at their best when you use them to leverage industry best practices rather than crowbar them to fit unconventional ways of operating. If you’re a manufacturer, is fiscal reporting part of your differentiator; probably not, so why not take best practice OOTB.

As usual, I have mind mapped things as I read through the book.  The dynamic/interactive version is here, the image (but not in full detail) is below.

evolutionary architectures.png

 

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Oracle Developer Meetup London – September 2018

18 Tuesday Sep 2018

Posted by mp3monster in APIs & microservices, Dev Meetup, General, Technology

≈ Leave a comment

Tags

API, apiary, devmeetup, drone, GraphQL, JET, London, meetup, OJET, Oracle, Technology

#OracleDevMeetup in London - GraphQL

Last night we ran the latest of the Oracle Developer Meetups in London. This time Luis Weir presented on GraphQL, which got an very engaged discussion about the strengths and weaknesses of GraphQL, in-depth points about how the error paths should be handled among many other things.

The presentation material Luis used is based upon his Devoxx session earlier this year and can be seen here:

The links to Luis’ examples can be found on his GitHub account – https://github.com/luisw19/graphql-samples

After a insightful and thought provoking presentation on GraphQL the Drones with APIs project had its latest update.  Providing a lot of laughter to the evening’s proceedings. Including demonstration of flying the drone using REST APIs published via a gateway and Go back-end.  This included the DroneDash presenting a visual presentation of the commands being issues via REST, as seen here:

#OracleDeveloperMeetup demo with @PhilAtCapgemini showcasing a 3D model UI built using @OracleJET by @Jmneate that tracks and simulates real time movements of a drone using web sockets pic.twitter.com/esb1EIPHtF

— Luis Augusto Weir (@Luisw19) September 17, 2018

All the code, API definitions and documentation for people to add or extend can be found in the meetup’s GITHub – https://github.com/oracledeveloperslondon/.

A few of the useful links used or mentioned last night are:

  • GraphQL
  • Apollo Express
  • GraphiQL – GraphQL Design Tool
  • Cheerios Library for screen scraping
  • Oracle JET toolkit
  • Luis’ GraphQL Samples
  • GitHub repository with all the drone resources
  • API Documentation for the Drone, and the Drone Dash
  • Request Bin (capture and display HTTP requests) https://requestbin.fullcontact.com/

 

The next meetup is planned for Monday November 19th.  Topics  will be published soon.

 

#OracleDevMeetup in London - GraphQL

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Oracle Code London – Presentation & Periscope Interview

31 Thursday May 2018

Posted by mp3monster in General, Oracle, Technology

≈ 2 Comments

Tags

interview, Oracle, OracleCode, periscope, Technology

Whilst in London Wednesday to present Microservices in a Monolith World at the Oracle Code London,  I also participated in an interview streamed via Periscope.  The interview can be seen at https://www.pscp.tv/w/1jMKgqBrwYyJL 

Not only was this interview captured, my entire presentation is available on YouTube …

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Understanding API Deployment State on API Platform

25 Thursday Jan 2018

Posted by mp3monster in API Platform CS, APIs & microservices, development, General, Oracle, Technology, tools

≈ 6 Comments

Tags

API, API Platform, API-PCS, Groovy, iterations, Oracle, Script, Technology, utility, versions

The new Oracle API Platform makes it possible to deploy different versions of your APIs to different gateway instances. When you you’re managing the Development API Policies through all the different stages of the lifecycle (Design to Production) from a single management tier such a capability is essential. This is further challenged by the fact that each save of you API Definition creates a new iteration (the term used to identify each saved ‘version’ of the API)

However it does lead the challenge from a management perspective of knowing which iterations are running on each Gateway.. you can get the information from the current UI but it requires multiple steps to get the information. The UI also lends itself more to the design processes today than perhaps the more dense information views that a operational report might warrant.

I’m sure that over time these views will come, but today we can solve the problem by taking advantage of the fact that the product lives by its own ‘mission’ by offering a very rich set of APIs. As a result it becomes possible to actually build your own views. To that end I have written a Groovy script which will go through each API that can be seen and retrieves the iteration deployed to each logical gateway.

In terms of running the script you obviously need Groovy installed. It expects 3 parameters which are:

  • Server address e.g. https://1.2.3.4
  • Username e.g. weblogic
  • Password e.g. Welcome1

You can hardwire into the script default values which will then be used if no parameters are provided.

Here is a screenshot of some output.  I have masked out some information for reasons of security. But there should be enough here to give a sense of what is happening:

APIPlatformScript

The script includes suppressing certificate validation – necessary if you haven’t yet deployed your own specific certificate and still working with the default Oracle certificate.

Feel free to take the script and play with it. I make no claims to it’s elegance etc but I have tried to comment it so you can see what is going on. I have tried to keep the code fairly simple so you can see how it works and processes the JSON responses. The script is available at: https://github.com/mp3monster/Utils/blob/master/getDeployedIterations.groovy

For more about the APIs involved in the script, checkout

  •  https://docs.oracle.com/en/cloud/paas/api-platform-cloud/apfrm/api-APIs.html
  • https://docs.oracle.com/en/cloud/paas/api-platform-cloud/

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2017 into 2018 as a Geek

30 Saturday Dec 2017

Posted by mp3monster in General, Technology

≈ Leave a comment

Tags

conference, integration, OIC - ICS, OUG, Technology

It seems that it becoming common for people to write a personal review of the year. If you’re old school Christmas Card sort then it gets printed and put in the card. If you’re a bit more hip then it’s a Facebook post. For those trendier than that, who knows?

Anyway, I thought I’d use my blog to reflect on what has happened and what we hope to be upto in 2018.

So the big headlines for us …

  • 1st book published as a co-author about ICS, started another book project which should be finished in 2018.Artwork-front
  • Packt have been talking to me about another book project (even though my contribution to book 2 not yet finished!) Have to admit what is being suggested is intriguing and a bit different
  • Then there was the UKOUG Journey to the Cloud event. Having been postponed because of venue flooding it was good to see this happen. Not to mention it being one of s number of events I have presented at this year.39178284831_45be4e943c_m
  • We attended and presented at the Oracle EMEA Partner Conference for the 1st time and presented with my co-author on ICS.
  • Contributions to supporting the UKOUG as part of a SIG committee member, reviewed for Oracle Scene. Being involved in a SIG committee also meant helping plan the conference.
  • Writing hasn’t just been about the books, we continue to write our own blog posts, content for Oracle-integration.cloud plus several journals including Oracle Technology Network,
  • Presenting at Oracle Open World for the 1st time, and signing copies of our book on ICS
  • Promoted from an Oracle Ace Associate to a full Oracle Ace.

So where will 2018 take us, well somethings we’re confident of …

  • Wrapping up my contribution to the API Platform book8683
  • Blog posts both here and at Oracle-Integration.cloud
  • Middleware SIG committee activities in addition to event committee activities
  • Presenting to the nlOUG SIG on OMESA
  • Lots more with London Oracle Developer Meetup – perhaps flying some drones with APIs.

What do we hope to pull off …

  • Another year presenting at Open World,
  • UKOUG Tech 18 presentations
  • Articles for Oracle Scene
  • Submissions accepted at Oracle Code London
  • Presenting at Oracle EMEA Partner Conference

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