This slide deck (partly German) covers async and parallel programming topics for .NET and C#. For details see http://www.software-architects.com/devblog/2014/02/18/BASTA-2014-Spring-C-Workshop
A few slides about asynchrnous programming in Node, from callback hell to control flows using promises, thunks and generators, providing the right amount of abstraction to write great code.
All examples available on https://github.com/troch/node-control-flow.
This talk was given at JSSummit 2013. Entitled "Avoiding Callback Hell with Async.js", my talk focused on common pitfalls with asynchronous functions and callbacks in JavaScript, and using the async.js library and its advanced control flows to create cleaner, more manageable code.
This is the Async / Await feature added to .NET in .NET 4.5, specifically...Everything I Wish I Knew When I Started Using It! By avoiding the client side discussions around the UI and parallel processing, we can focus on the environment in which most of us live and have both an introduction and deeper dive into how it all works. This is about how we can all use the feature RIGHT NOW to write better performing code.
Node has revolutionized modern runtimes. Their async by default strategy boasts 3x the throughput of Java. And yet, the language runs 5x slower than C++ (when JS is interpreted).
This talk is an advanced intro into the world of Node where we take a closer look under the hood. What's the event loop? Why are there multiple compilers for JS in Node/V8? How many threads are actually used in Node and for what purpose? We'll answer these questions and more as we go over libuv, v8, the node core library, npm, and more.
If you're developing with Node, want to start, or are just curious about how it works, please check it out!
Ember applications are built around an MVC model that prescribes Models, Views, Controllers, and Routes for managing persistence, DOM, application state, and URLs. In an ambitious enough app, that model may fail to cover the whole problem space. Fear not, for in this presentation you will learn how to use Ember’s container and dependency features to move beyond MVC, as well as learning how they tie Ember internals together.
Video: http://www.youtube.com/watch?v=iCZUKFNXA0k&feature=youtu.be&t=1h45m59s
A few slides about asynchrnous programming in Node, from callback hell to control flows using promises, thunks and generators, providing the right amount of abstraction to write great code.
All examples available on https://github.com/troch/node-control-flow.
This talk was given at JSSummit 2013. Entitled "Avoiding Callback Hell with Async.js", my talk focused on common pitfalls with asynchronous functions and callbacks in JavaScript, and using the async.js library and its advanced control flows to create cleaner, more manageable code.
This is the Async / Await feature added to .NET in .NET 4.5, specifically...Everything I Wish I Knew When I Started Using It! By avoiding the client side discussions around the UI and parallel processing, we can focus on the environment in which most of us live and have both an introduction and deeper dive into how it all works. This is about how we can all use the feature RIGHT NOW to write better performing code.
Node has revolutionized modern runtimes. Their async by default strategy boasts 3x the throughput of Java. And yet, the language runs 5x slower than C++ (when JS is interpreted).
This talk is an advanced intro into the world of Node where we take a closer look under the hood. What's the event loop? Why are there multiple compilers for JS in Node/V8? How many threads are actually used in Node and for what purpose? We'll answer these questions and more as we go over libuv, v8, the node core library, npm, and more.
If you're developing with Node, want to start, or are just curious about how it works, please check it out!
Ember applications are built around an MVC model that prescribes Models, Views, Controllers, and Routes for managing persistence, DOM, application state, and URLs. In an ambitious enough app, that model may fail to cover the whole problem space. Fear not, for in this presentation you will learn how to use Ember’s container and dependency features to move beyond MVC, as well as learning how they tie Ember internals together.
Video: http://www.youtube.com/watch?v=iCZUKFNXA0k&feature=youtu.be&t=1h45m59s
Presentation I gave to the node.dc meetup group March 13, 2013 on using Promises and the Q library to make flow of control easier to reason about in Javascript code using async and callbacks
This talk was delivered at JavaOne 2013, together with Andrzej Grzesik. We mention the new Date APIs, changes to Collections as well as Streams APIs and of course... Lambdas!
Introduction to reactive programming & ReactiveCocoaFlorent Pillet
A short introduction to the concepts of functional reactive programming, and their implementation in ReactiveCocoa, a framework for iOS and OS X developers.
This speech was given at CocoaHeads Paris, October 9th 2014
This talk was given at the Dutch PHP Conference 2011 and details the use of Comet (aka reverse ajax or ajax push) technologies and the importance of websockets and server-sent events. More information is available at http://joind.in/3237.
WINDOWS ADMINISTRATION AND WORKING WITH OBJECTS : PowerShell ISEHitesh Mohapatra
WINDOWS ADMINISTRATION AND WORKING WITH OBJECTS
CREATING AND MANAGING ACTIVE DIRECTORY OBJECTS
CONFIGURING NETWORK SETTINGS ON WINDOWS SERVER
CREATING A WEB SITE
SELECTING, SORTING, AND DISPLAYING DATA
FILTERING OBJECTS AND ENUMERATING OBJECTS
Testing Ember Apps: Managing DependencyMatthew Beale
Ember has an amazing testing story built upon the fundamentals of encapsulation and OO programming central to the framework. Despite this, every web application will be dependent upon and need to interact with native and network APIs that are hostile: Unreliable, slow, under-documented, and not to be trusted. The challenge in testing Ember applications lies with how to handle these external entities.
One of JavaScript’s strengths is how it handles asynchronous code. Async is one of the most important and often misunderstood part of Javascript or any other language. Async is hard because we, as human beings, can’t do two conscious actions at once and think about both of them at the same moment. In this talk we will see how asynchronous JavaScript evolved over the years. It all started with callbacks… and it landed on generators!
SymfonyCon Berlin 2016 Jenkins Deployment Pipelinescpsitgmbh
Currently I'm working on a flexible deployment pipeline in Jenkins where I can reuse some templates and create new pipelines within minutes. I'd like to present my solution, talk about the basics of Jenkins and explain why it's the better way to deploy with a CI server.
Your website is done. Your webpages access data from a database or a web service and have a 1 to 2 second response time. After deploying the application your user interface is unresponsive and your server doesn’t scale.
In this presentation we will find out what’s happening to our website under scale and how we can use the new async/await support in .NET 4.5 to make our application more responsive under load.
Presentation I gave to the node.dc meetup group March 13, 2013 on using Promises and the Q library to make flow of control easier to reason about in Javascript code using async and callbacks
This talk was delivered at JavaOne 2013, together with Andrzej Grzesik. We mention the new Date APIs, changes to Collections as well as Streams APIs and of course... Lambdas!
Introduction to reactive programming & ReactiveCocoaFlorent Pillet
A short introduction to the concepts of functional reactive programming, and their implementation in ReactiveCocoa, a framework for iOS and OS X developers.
This speech was given at CocoaHeads Paris, October 9th 2014
This talk was given at the Dutch PHP Conference 2011 and details the use of Comet (aka reverse ajax or ajax push) technologies and the importance of websockets and server-sent events. More information is available at http://joind.in/3237.
WINDOWS ADMINISTRATION AND WORKING WITH OBJECTS : PowerShell ISEHitesh Mohapatra
WINDOWS ADMINISTRATION AND WORKING WITH OBJECTS
CREATING AND MANAGING ACTIVE DIRECTORY OBJECTS
CONFIGURING NETWORK SETTINGS ON WINDOWS SERVER
CREATING A WEB SITE
SELECTING, SORTING, AND DISPLAYING DATA
FILTERING OBJECTS AND ENUMERATING OBJECTS
Testing Ember Apps: Managing DependencyMatthew Beale
Ember has an amazing testing story built upon the fundamentals of encapsulation and OO programming central to the framework. Despite this, every web application will be dependent upon and need to interact with native and network APIs that are hostile: Unreliable, slow, under-documented, and not to be trusted. The challenge in testing Ember applications lies with how to handle these external entities.
One of JavaScript’s strengths is how it handles asynchronous code. Async is one of the most important and often misunderstood part of Javascript or any other language. Async is hard because we, as human beings, can’t do two conscious actions at once and think about both of them at the same moment. In this talk we will see how asynchronous JavaScript evolved over the years. It all started with callbacks… and it landed on generators!
SymfonyCon Berlin 2016 Jenkins Deployment Pipelinescpsitgmbh
Currently I'm working on a flexible deployment pipeline in Jenkins where I can reuse some templates and create new pipelines within minutes. I'd like to present my solution, talk about the basics of Jenkins and explain why it's the better way to deploy with a CI server.
Your website is done. Your webpages access data from a database or a web service and have a 1 to 2 second response time. After deploying the application your user interface is unresponsive and your server doesn’t scale.
In this presentation we will find out what’s happening to our website under scale and how we can use the new async/await support in .NET 4.5 to make our application more responsive under load.
Threads, Queues, and More: Async Programming in iOSTechWell
To keep your iOS app running butter-smooth at 60 frames per second, Apple recommends doing as many tasks as possible asynchronously or “off the main thread.” Joe Keeley introduces you to some basic concepts of asynchronous programming in iOS. He discusses what threads and queues are, how they are related, and the special significance of the main queue to iOS. Look at what options are available in the iOS SDK to work asynchronously, including NSOperationQueues and Grand Central Dispatch. Take an in depth look at how to implement some common use cases for those options in Swift. Joe pays special attention to networking, one of the most common asynchronous use cases. Spend some time discussing common asynchronous programming pitfalls—and how to avoid them. Leave this session ready to try out asynchronous programming in your iOS app.
10 Excellent Ways to Secure Spring Boot Applications - Okta Webinar 2020Matt Raible
Spring Boot is an efficient way to build Java applications with the Spring Framework. If you’re developing apps that handle sensitive data, you should make sure they’re secure.
This session will cover HTTPS, dependency checking, CSRF, using a CSP to prevent XSS, OIDC, password hashing, and much more!
You’ll learn how to add these features to a real application, using the Java language you know and love.
* Blog post: https://developer.okta.com/blog/2018/07/30/10-ways-to-secure-spring-boot
* Cheat sheet: https://snyk.io/blog/spring-boot-security-best-practices/
* OIDC demo: http://bit.ly/spring-oidc-demo
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Search and Society: Reimagining Information Access for Radical FuturesBhaskar Mitra
The field of Information retrieval (IR) is currently undergoing a transformative shift, at least partly due to the emerging applications of generative AI to information access. In this talk, we will deliberate on the sociotechnical implications of generative AI for information access. We will argue that there is both a critical necessity and an exciting opportunity for the IR community to re-center our research agendas on societal needs while dismantling the artificial separation between the work on fairness, accountability, transparency, and ethics in IR and the rest of IR research. Instead of adopting a reactionary strategy of trying to mitigate potential social harms from emerging technologies, the community should aim to proactively set the research agenda for the kinds of systems we should build inspired by diverse explicitly stated sociotechnical imaginaries. The sociotechnical imaginaries that underpin the design and development of information access technologies needs to be explicitly articulated, and we need to develop theories of change in context of these diverse perspectives. Our guiding future imaginaries must be informed by other academic fields, such as democratic theory and critical theory, and should be co-developed with social science scholars, legal scholars, civil rights and social justice activists, and artists, among others.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
2. BASTA! Spring 2014
Rainer Stropek
Async und
Parallel
software architects gmbh
Web http://www.timecockpit.com
Mail rainer@timecockpit.com
Twitter @rstropek
Workshop
Saves the day.
5. private static void DownloadSomeText()
{
var finishedEvent = new AutoResetEvent(false);
// Notice the IAsyncResult-pattern here
Dns.BeginGetHostAddresses("www.basta.net", GetHostEntryFinished,
finishedEvent);
finishedEvent.WaitOne();
}
private static void GetHostEntryFinished(IAsyncResult result)
{
var hostEntry = Dns.EndGetHostAddresses(result);
using (var client = new WebClient())
{
// Notice the Event-based asynchronous pattern here
client.DownloadStringCompleted += (s, e) =>
{
Console.WriteLine(e.Result);
((AutoResetEvent)result.AsyncState).Set();
};
client.DownloadStringAsync(new Uri(string.Format(
"http://{0}",
hostEntry[0].ToString())));
}
}
IAsyncResult
Pattern
6. private static void DownloadSomeText()
{
var finishedEvent = new AutoResetEvent(false);
// Notice the IAsyncResult-pattern here
Dns.BeginGetHostAddresses(
"www.basta.net",
(result) =>
{
var hostEntry = Dns.EndGetHostAddresses(result);
using (var client = new WebClient())
{
// Notice the Event-based asynchronous pattern here
client.DownloadStringCompleted += (s, e) =>
{
Console.WriteLine(e.Result);
((AutoResetEvent)result.AsyncState).Set();
};
client.DownloadStringAsync(new Uri(string.Format(
"http://{0}",
hostEntry[0].ToString())));
}
},
finishedEvent);
finishedEvent.WaitOne();
}
IAsyncResult
Pattern
With Lambdas
7. private static void DownloadSomeTextUsingTask()
{
Dns.GetHostAddressesAsync("www.basta.net")
.ContinueWith(t =>
{
using (var client = new WebClient())
{
return client.DownloadStringTaskAsync(
new Uri(string.Format(
"http://{0}",
t.Result[0].ToString())));
}
})
.ContinueWith(t2 => Console.WriteLine(t2.Unwrap().Result))
.Wait();
}
TPL
Notice the use of the new Task Async
Pattern APIs in .NET 4.5 here
8. Rules For Async Method Signatures
Method
Return
name ends with Async
value
Task if sync version has return type void
Task<T> if sync version has return type T
Avoid
out and ref parameters
Use e.g. Task<Tuple<T1, T2, …>> instead
9. // Synchronous version
private static void DownloadSomeTextSync()
{
using (var client = new WebClient())
{
Console.WriteLine(
client.DownloadString(new Uri(string.Format(
"http://{0}",
(Dns.GetHostAddresses("www.basta.net"))[0]))));
}
}
// Asynchronous version
private static async void DownloadSomeTextUsingTaskAsync()
{
using (var client = new WebClient())
{
Console.WriteLine(
await client.DownloadStringTaskAsync(new Uri(string.Format(
"http://{0}",
(await Dns.GetHostAddressesAsync("www.basta.net"))[0]))));
}
}
Sync vs. Async
Notice how similar the sync and async
versions are!
10. private static async void DownloadSomeTextUsingTaskAsync2()
{
using (var client = new WebClient())
{
try
{
var ipAddress = await Dns.GetHostAddressesAsync("www.basta.net");
var content = await client.DownloadStringTaskAsync(
new Uri(string.Format("htt://{0}", ipAddress[0])));
Console.WriteLine(content);
}
catch (Exception)
{
Console.WriteLine("Exception!");
}
}
}
Generated Code
12. private async static void CancelTask()
{
try
{
var cancelSource = new CancellationTokenSource();
var result = await DoSomethingCancelledAsync(cancelSource.Token);
Console.WriteLine(result);
}
catch (OperationCanceledException)
{
Console.WriteLine("Cancelled!");
}
}
private static Task<int> DoSomethingCancelledAsync(CancellationToken token)
{
// For demo purposes we ignore token and always return a cancelled task
var result = new TaskCompletionSource<int>();
result.SetCanceled();
return result.Task;
}
TPL
TaskCompletionSource<T>
13. Note that async API of WebClient uses
existing cancellation logic instead of
CancellationTokenSource
14.
15. Guidelines for async/await
Caller
Async
runs in parallel to awaited methods
methods sometimes do not run async (e.g. if task
is already completed when async is reached)
16. Guidelines for async/await (UI Layer)
async/await
use SynchronizationContext to
execute the awaiting method UI thread in case of UI
layer
Use
Task.ConfigureAwait to disable this behavior
E.g. inside library to enhance performance
17. public partial class MainWindow : Window
{
public MainWindow()
{
this.DataContext = this;
this.ListBoxContent = new ObservableCollection<string>();
this.InitializeComponent();
this.ListBoxContent.Add("Started");
this.Loaded += async (s, e) =>
{
for (int i = 0; i < 10; i++)
{
ListBoxContent.Add(await Task.Run(() =>
{
Thread.Sleep(1000);
return "Hello World!";
}));
}
this.ListBoxContent.Add("Finished");
};
}
public ObservableCollection<string> ListBoxContent { get; private set; }
Async/await im UI
18.
19. Guidelines For Implementing Methods Ready For async/await
Return Task/Task<T>
Use postfix Async
If method support cancelling, add parameter of type
System.Threading.CancellationToken
If method support progress reporting, add IProgress<T> parameter
Only perform very limited work before returning to the caller (e.g. check arguments)
Directly throw exception only in case of usage errors
20. public class Program : IProgress<int>
{
static void Main(string[] args)
{
var finished = new AutoResetEvent(false);
PerformCalculation(finished);
finished.WaitOne();
}
private static async void PerformCalculation(AutoResetEvent finished)
{
Console.WriteLine(await CalculateValueAsync(
42,
CancellationToken.None,
new Program()));
finished.Set();
}
public void Report(int value)
{
Console.WriteLine("Progress: {0}", value);
}
Progress Reporting
21. private static Task<int> CalculateValueAsync(
int startingValue,
CancellationToken cancellationToken,
IProgress<int> progress)
{
if (startingValue < 0)
{
// Usage error
throw new ArgumentOutOfRangeException("startingValue");
}
return Task.Run(() =>
{
int result = startingValue;
for (int outer = 0; outer < 10; outer++)
{
cancellationToken.ThrowIfCancellationRequested();
// Do some calculation
Thread.Sleep(500);
result += 42;
progress.Report(outer + 1);
}
return result;
});
}
}
Cancellation
22. private static async void PerformCalculation(AutoResetEvent
finished)
{
try
{
var cts = new CancellationTokenSource();
Task.Run(() =>
{
Thread.Sleep(3000);
cts.Cancel();
});
var result = await CalculateValueAsync(
42,
cts.Token,
new Program());
}
catch (OperationCanceledException)
{
Console.WriteLine("Cancelled!");
}
finished.Set();
}
Cancellation
23. private static Task<int> CalculateValueAsync(
int startingValue,
CancellationToken cancellationToken,
IProgress<int> progress)
{
if (startingValue < 0)
{
// By definition the result has to be 0 if startingValue < 0
return Task.FromResult(0);
}
return Task.Run(() =>
{
[…]
});
}
Task.FromResult
Note how
Task.FromResult is used
to return a pseudo-task
Note that you could use
TaskCompletionSource
instead
24. namespace MvcApplication2.Controllers
{
public class BlogController : ApiController
{
// GET api/values/5
public async Task<BlogItem> Get(int id)
{
// Open context to underlying SQL database
using (var context = new BlogContext())
{
// Make sure that it contains database
await context.GenerateDemoDataAsync();
// Build the query
var blogs = context
.BlogItems
.Where(b => b.BlogId == id);
// Execute query
return await blogs.FirstOrDefaultAsync();
}
}
}
}
Async Web API
25. namespace MvcApplication2.Tests.Controllers
{
[TestClass]
public class BlogControllerTest
{
[TestMethod]
public async Task GetById()
{
BlogController controller = new BlogController();
var result = await controller.Get(1);
Assert.IsNotNull(result);
result = await controller.Get(99);
Assert.IsNull(result);
}
}
}
Async Unit Test
26. BASTA! Spring 2014
Rainer Stropek
software architects gmbh
Q&A
Mail rainer@timecockpit.com
Web http://www.timecockpit.com
Twitter @rstropek
Thank your for coming!
Saves the day.
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