This document discusses Java 8 concurrency abstractions including asynchronous result processing using CompletableFuture and optimistic locking using StampedLock. It provides an overview and comparison to previous concurrency APIs. The agenda includes exploring CompletableFuture features like asynchronous execution, chaining reactions, and exception handling. It also covers using StampedLock for optimistic reads, comparing it to the previous ReentrantReadWriteLock approach. Examples are shown for common use cases of these new concurrency APIs.
All the Laravel things: up and running to making $$Joe Ferguson
Laravel 5 has established itself as one of the best PHP rapid application development frameworks. Come learn about all the tools in the Laravel ecosystem designed to save you time and prevent you from writing the boring cruft you have to write for every application. We'll cover getting started with local development, building a basic application, and deploying to production. We'll review how Laravel easily handles vagrant, testing, oauth login services, billing and subscriptions services through Laravel Spark, and deploying your application with services such as Laravel Envoyer and Forge to manage your servers.
All the Laravel things: up and running to making $$Joe Ferguson
Laravel 5 has established itself as one of the best PHP rapid application development frameworks. Come learn about all the tools in the Laravel ecosystem designed to save you time and prevent you from writing the boring cruft you have to write for every application. We'll cover getting started with local development, building a basic application, and deploying to production. We'll review how Laravel easily handles vagrant, testing, oauth login services, billing and subscriptions services through Laravel Spark, and deploying your application with services such as Laravel Envoyer and Forge to manage your servers.
Apache Camel Introduction & What's in the boxClaus Ibsen
Slides from JavaBin talk in Grimstad Norway, presented by Claus Ibsen in February 2016.
This slide deck is full up to date with latest Apache Camel 2.16.2 release and includes additional slides to present many of the features that Apache Camel provides out of the box.
SenchaCon 2016: Learn the Top 10 Best ES2015 Features - Lee Boonstra Sencha
In this session, Lee will cover the top 10 new features of ECMAScript 2015, their benefits, and go through code examples of how to use them. She will also talk about ECMAScript 2015 compatibilities and incompatibilities with the most widely used browsers today, and how you should plan on developing your applications with ECMAScript 2015.
Advanced Server Integration with Data and DirectSencha
Many Ext JS developers have yet to take advantage of Ext Direct to directly call server methods from the browser. During this session, you'll learn how to leverage Ext.Direct's existing functionality to make accessing your server data easier while eliminating common boiler-plate code. This session focuses on introductory material.
Laravel, längst kein unbestriebenes Blatt mehr, gewinnt immer mehr an Popularität.
In diesem Vortrag wir Laravel kurz vorgestellt mit Themen wie:
- Was ist Laravel?
- Woher kommt Laravel?
- Was bietet Laravel?
- Laravel und sein Ecosystem.
und einiges mehr...
Seven perilous pitfalls to avoid with Java | DevNation Tech TalkRed Hat Developers
Developers and security: It’s a lot more than just turning on SSL. In this session we’re going to learn to think differently about designing and coding in Java so that the application is less open to being attacked and (bonus) is often of higher quality. This talk will cover seven types of development issues that can get your application into trouble. With code examples (of course), we’ll explore a series of common code pitfalls and explain how to design and code differently. There is much to learn when creating a secure application - take your first steps here.
This presentation is on advanced debugging using Java bytecodes (presented in Core Java meetup on 1st October in Accion Labs). If you are a Java developer and are interested in knowing advanced debugging techniques or understanding bytecodes, this presentation is for you.
Apache Camel Introduction & What's in the boxClaus Ibsen
Slides from JavaBin talk in Grimstad Norway, presented by Claus Ibsen in February 2016.
This slide deck is full up to date with latest Apache Camel 2.16.2 release and includes additional slides to present many of the features that Apache Camel provides out of the box.
SenchaCon 2016: Learn the Top 10 Best ES2015 Features - Lee Boonstra Sencha
In this session, Lee will cover the top 10 new features of ECMAScript 2015, their benefits, and go through code examples of how to use them. She will also talk about ECMAScript 2015 compatibilities and incompatibilities with the most widely used browsers today, and how you should plan on developing your applications with ECMAScript 2015.
Advanced Server Integration with Data and DirectSencha
Many Ext JS developers have yet to take advantage of Ext Direct to directly call server methods from the browser. During this session, you'll learn how to leverage Ext.Direct's existing functionality to make accessing your server data easier while eliminating common boiler-plate code. This session focuses on introductory material.
Laravel, längst kein unbestriebenes Blatt mehr, gewinnt immer mehr an Popularität.
In diesem Vortrag wir Laravel kurz vorgestellt mit Themen wie:
- Was ist Laravel?
- Woher kommt Laravel?
- Was bietet Laravel?
- Laravel und sein Ecosystem.
und einiges mehr...
Seven perilous pitfalls to avoid with Java | DevNation Tech TalkRed Hat Developers
Developers and security: It’s a lot more than just turning on SSL. In this session we’re going to learn to think differently about designing and coding in Java so that the application is less open to being attacked and (bonus) is often of higher quality. This talk will cover seven types of development issues that can get your application into trouble. With code examples (of course), we’ll explore a series of common code pitfalls and explain how to design and code differently. There is much to learn when creating a secure application - take your first steps here.
This presentation is on advanced debugging using Java bytecodes (presented in Core Java meetup on 1st October in Accion Labs). If you are a Java developer and are interested in knowing advanced debugging techniques or understanding bytecodes, this presentation is for you.
Software Architecture - Principles Patterns and Practices - OSI Days Workshop...CodeOps Technologies LLP
Are you a developer or designer aspiring to become an architect? Do you want to learn about the architecture of open source applications? Do you want to learn software architecture through case studies and examples? If you have answered “yes” to any of these questions, this workshop is certainly for you. This workshop will introduce you to key topics in software architecture including architectural principles, constraints, non-functional requirements (NFRs), architectural styles and design patterns, viewpoints and perspectives, and architecture tools. A special feature of this workshop: it covers examples and case studies from open source applications. What’s more, you’ll also get exposed to some free or open source tools used by practicing software architects.
http://opensourceindia.in/osidays/workshops-osi-2016/
A brief history on hybrid applications and their transformation from then to now. an overview of cross platform mobile app development, giving examples of Xamarin and Ionic.
Awareness of design smells - indicators of common design problems - helps developers or software engineers understand mistakes made while designing and apply design principles for creating high-quality designs. This workshop provides insights gained from performing refactoring in real-world projects to improve refactoring and reduce the time and costs of managing software projects. The workshop also presents insightful anecdotes and case studies drawn from the trenches of real-world projects. By attending this workshop, you will know pragmatic techniques for refactoring design smells to manage technical debt and to create and maintain high-quality software in practice.
Contents overview:
* Why care about design principles, design quality, or design smells?
* Refactoring as the primary means for repaying technical debt
* Smells that violate abstraction, encapsulation, modularisation, or hierarchy
* Tools and techniques for refactoring
Solid Principles Of Design (Design Series 01)Heartin Jacob
Learn about the solid principles of design along with some additional useful principles and practices and also few important considerations to avoid in your design. Introduction is also provided to the Design Patterns. This is usually taken as a hands on session with design and refactoring exercises.
Tool chain to produce high performance DevOps. It covers whole lifecycle of Softwares, includes Continuous Integration, Deployment, Delivery, Monitoring, Feedback/Improvement
Building Scalable Stateless Applications with RxJavaRick Warren
RxJava is a lightweight open-source library, originally from Netflix, that makes it easy to compose asynchronous data sources and operations. This presentation is a high-level intro to this library and how it can fit into your application.
Everything you wanted to know about writing async, concurrent http apps in java Baruch Sadogursky
As presented at CodeMotion Tel Aviv:
Facing tens of millions of clients continuously downloading binaries from its repositories, JFrog decided to offer an OSS client that natively supports these downloads. This session shares the main challenges of developing a highly concurrent, resumable, async download library on top of an Apache HTTP client. It also covers other libraries JFrog tested and why it decided to reinvent the wheel. Consider yourself forewarned: lots of HTTP internals, NIO, and concurrency ahead!
Sharding and Load Balancing in Scala - Twitter's FinagleGeoff Ballinger
My presentation at Mostly Functional (http://mostlyfunctional.com), part of this year's Turing Festival Fringe (http://turingfestival.com) in Edinburgh. The example source code is up on Github at https://github.com/geoffballinger/simple-sharder
Cachopo - Scalable Stateful Services - Madrid Elixir MeetupAbel Muíño
This is an introduction to building our services in a different way, where state is moved out of the database and into the services (as opposed to mainstream stateless servers).
It also describes one particular proof-of-concept tool that Cabify built during its annual offsite.
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Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
5. Asynchronous Result Processing
1. Overview of concurrency libraries added in
JDK8
2. Asynchronous result processing
3. CompletableFuture (Vs classical Future)
4. StampedLock (Vs ReadWriteLock)
6. Asynchronous Result Processing
– Synchronous
– Not Synchronous, Asynchronous [Java 5]
– Asynchronous and Reactive [Java 8]
Client Server
Request
Server
Proc...
Client Blocked
Response
Synchronous
Client Server
Request
Server
Proc...
Ctrl ret. immed
Asynchronous
Client polls - X
Client polls - Y
Response
Client Server
Request
Server
Proc...
Response Push
Ctrl ret. immed
Asynchronous + Reactive
7. Agenda
1. Overview of concurrency libraries added in
JDK8
2. Asynchronous result processing
3. CompletableFuture (Vs classical Future)
4. StampedLock (Vs ReadWriteLock)
8. Classical Future
• An interface in java.util.concurrent pkg
• FutureTask is the concrete implementation
• Represents the result of an async processing.
• Utility Methods with the interface:
– isDone()
– isCancelled()
– cancel(boolean mayInterruptIfRunning)
• Lets see it in action!
9. Classical Future continued 3
• Future programming model:
ExecutorService pool = ...
Future<Double> bankBalance=pool.submit(()->{
Thread.sleep(5000L);//sim processing time
return bankBalance;
});
try{
double balance = bankBalance.get(); //blocking call
}catch(InterruptedException ignore){}
• Work around:
– May spin around and check with isDone() or isCancelled();
– Use CompletableFuture!
10. CompletableFuture
• A class in java.util.concurrent package
• Implements CompletionStage and Future
interfaces (both in java.util.concurrent pkgs)
• Since CompletableFuture implements Future,
it can be used classically – blockingly!
• CompletionStage is the interface which
provides all the reactive constructs; fat
interface
12. supplyAsync(...) Variants
• publicstatic <U> CompletableFuture<U> supplyAsync(Sup
plier<U> supplier)
– Uses ForkJoinPool.commonPool();
• publicstatic <U> CompletableFuture<U> supplyAsync(Sup
plier<U> supplier, Executor executor)
– Uses the passed into Executor as the thread pool
• supplyAsync’s counterpart – runAsync(...)
– Takes Runnable instead of Supplier
– Returns CompletableFuture<Void>
– Calling get() would return null
13. thenAccept(...) Variants
• public CompletableFuture<Void> thenAccept(Consumer<?
super T> action)
• public CompletableFuture<Void> thenAcceptAsync(Consumer
<? super T> action)
• public CompletableFuture<Void> thenAcceptAsync(Consumer
<? super T> action, Executor executor)
14. More into piping Reactions
• Fluent API helps piping reactions.
• supplyAsync(Supplier)
.whenComplete(BiConsumer)//res, err
.thenApply(Function)
.thenAccept(Consumer)
.thenRun(Runnable)
15. Other Important Piping APIs - 1
• Composition:
public <U> CompletableFuture<U> thenCompose(Function<?
super T,? extends CompletionStage<U>> fn)
(This)
CompletionStage<U>
Function(? super T, ?
extends
CompletionStage<U>)
CompletionStage<T>
16. Other Important Piping APIs - 2
• Combination:
public <U,V> CompletableFuture<V> thenCombine(Completio
nStage<? extends U> other, BiFunction<? super T,? super U,?
extends V> fn)
(This)
CompletionStage
<U>
(Other)
CompletionStage
<V>
BiFunction(?
super T, ? Super
U, ? extends V)
CompletionStage
<T>
17. How we leveraged the power of
CompletableFuture
• Use Case #1 (Remote Serivces)
– Two remote services.
– Both replicate service
– We needed anyone to respond; faster! (acceptEither)
– Lets simulate what we did!
– Can be extended easily to any number of services!
• public static CompletableFuture<Object> anyOf(CompletableFuture<?>... cfs)
18. How we leveraged the power of
CompletableFuture - 2
• Use Case #2 (update UI after File FTP completes)
– Application UI uploads file; not on UI thread;
– UI thread is not blocked; it reacts whenever FTP is completed.
– CompletableFuture<FTPStatus> ftp = CompletableFuture.supplyAsync(()->{
return FTPClient.uploadFile(file);
});
ftp . whenComplete((ftpStatus,error)->{ //takes BiConsumer; alt. handle takes
//BiFunction
if (error == null){
//grab UI thread and update of successful FTP
} else{
// grab UI thread and update of failure FTP
}
})
19. Creating APIs to return
CompletableFuture
• How to expose CompletableFuture APIs for Clients!
• Instantiate CompletableFuture
• Set result to it asynchronously.
public CompletableFuture<String> getPageContent(URL url){
CompletableFuture<String> futurePage =
CompletableFuture<>();
Runnable task = ()->{
try{
String htmlContent = fetchPageContent(url); //long running
futurePage.complete(htmlContent); //not with classicFuture
// this is why it is CompletableFut.
}catch(Throwable th){
futurePage.completeExceptionally(th); //set complete exceptionally
}
};
exec.submit(task);
return futurePage;
}
20. Exception Handling
• Exception Handling in CompletableFuture:
– exceptionally()
– handle()
– whenComplete()
• Time for Code !
22. ReentrantReadWriteLock
• ReentrantReadWriteLock Usage:
private SomeClass theData;
pri final ReadWriteLock myLocks =
new ReentrantReadWriteLock(true);
public void write(){
myLocks.writeLock().lock();
try{theData.write();}
finally{myLocks.writeLock().unlock();}
}
public void read(){
myLocks.readLock().lock();
try{theData.read();}
finally{myLocks.readLock().unlock();}
}
23. StampedLock
• JDK8 addition into package
java.util.concurrent.locks
– Works with versions of StampedLock – the
“Stamp”
– Modes
• Pessimistic Write
• Pessimistic Read
• Optimistic Read! (Optimization)
24. Pessimistic StampedLocking
Pessimistic Usage:
private SomeClass theData;
private final StampedLock lock=
new StampedLock(true);
public void write(){
long stamp = lock.writeLock();
try{theData.write();}
finally{lock.writeLock(stamp);}
}
public void read(){
long stamp = lock.readLock();
try{theData.read();}
finally{lock.unlockRead(stamp);}
}
25. Optimistic StampedLock
Optimistic usage:
• try OptimisticRead
• Validate optimisticRead stamp
• Based on the validation take further action.
• Lets Try!!!
private int p1, p2
StampedLock lock = new StampedLock();
public void read(){
long stamp = lock.tryOptimisticRead();
int l1 = p1;
int l2 = p2;
if(lock.validate(stamp)){ //validate the stamp (version)
process(l1, l2);
}else{
stamp = lock.readLock()//acquire pessimistic locks
try{l1 = p1;
l2= p2;
process(l1, l2);
}
finally{lock.unlockRead(stamp)}
}
}
26. Conclusion
• CompletableFuture is powerful
– Explore more
– Write your own RxJava
• StampedLock is more efficient and optimized
for particular use cases!