Grand Central Dispatch (GCD) dispatch queues are a powerful tool for performing tasks. Dispatch queues let you execute arbitrary blocks of code either asynchronously or synchronously with respect to the caller.
Deferrable Background work is extremely critical area for Android developers . With the onset of latest modifications in background processes/tasks in Oreo, Pie & even Q it has become very intricate & cumbersome dealing with background tasks within our app. Developers always struggle in choosing from different available alternatives like Alarm Manager, Firebase Job Dispatcher , Job Scheduler , GCM Network Manager which fall short in implementing background work in an effective manner .There was an absence of a clean & centralised solution for background processing which will work from Kitkat to the latest version of Android seamlessly.
In this talk, we will look into new Work Manager APIs introduced as new Android Architecture Components & part of Android Jetpack. We will understand where we should & should not use WorkManager. We will dive into the different mechanisms provided by WorkManager to monitor work via LiveData.
We will unravel how we constrain ,monitor and cancel work. Chained, Parallel, Periodic and Unique work will also be explained in detail with examples. Since the APIs are stable this will help us to analyse & use WorkManager effectively in our app for different situations.
Để xem full tài liệu Xin vui long liên hệ page để được hỗ trợ
: https://www.facebook.com/thuvienluanvan01
HOẶC
https://www.facebook.com/garmentspace/
https://www.facebook.com/thuvienluanvan01
https://www.facebook.com/thuvienluanvan01
tai lieu tong hop, thu vien luan van, luan van tong hop, do an chuyen nganh
Written by Dinesh Shetty, a mobile expert and CoE lead, this guide is a product of the research performed at Security Innovation’s CoE. It provides hackers, developers and managers alike with an in-depth knowledge about the different kinds of iOS hacking tools and techniques.
Deferrable Background work is extremely critical area for Android developers . With the onset of latest modifications in background processes/tasks in Oreo, Pie & even Q it has become very intricate & cumbersome dealing with background tasks within our app. Developers always struggle in choosing from different available alternatives like Alarm Manager, Firebase Job Dispatcher , Job Scheduler , GCM Network Manager which fall short in implementing background work in an effective manner .There was an absence of a clean & centralised solution for background processing which will work from Kitkat to the latest version of Android seamlessly.
In this talk, we will look into new Work Manager APIs introduced as new Android Architecture Components & part of Android Jetpack. We will understand where we should & should not use WorkManager. We will dive into the different mechanisms provided by WorkManager to monitor work via LiveData.
We will unravel how we constrain ,monitor and cancel work. Chained, Parallel, Periodic and Unique work will also be explained in detail with examples. Since the APIs are stable this will help us to analyse & use WorkManager effectively in our app for different situations.
Để xem full tài liệu Xin vui long liên hệ page để được hỗ trợ
: https://www.facebook.com/thuvienluanvan01
HOẶC
https://www.facebook.com/garmentspace/
https://www.facebook.com/thuvienluanvan01
https://www.facebook.com/thuvienluanvan01
tai lieu tong hop, thu vien luan van, luan van tong hop, do an chuyen nganh
Written by Dinesh Shetty, a mobile expert and CoE lead, this guide is a product of the research performed at Security Innovation’s CoE. It provides hackers, developers and managers alike with an in-depth knowledge about the different kinds of iOS hacking tools and techniques.
Learn how to build RESTful API using Node JS with Express Js Framework. Database used is Mongo DB (Mongoose Library). Learn Step by step what is Node JS, Express, API and Mongo DB. Explain and sample code step to build RESTful API
Slides from the NestJS MasterClass.
We learned how to build JavaScript server-side applications with NestJS - A progressive NodeJS framework built with TypeScript.
You can find the code on GitHub:
https://github.com/nirkaufman/task-manager
Structured concurrency with Kotlin Coroutines
1. Theory
- Coroutines
- Suspending functions
- Asynchronous Flows
- Channels
2. Practice
- Business lookup feature implementation in TransferWise app for Android
Formation Spring Avancé gratuite par Ippon 2014Ippon
Spring est le principal framework de développement Java utilisé en entreprise. Ce succès tient au fait qu'il permet de développer facilement et rapidement des applications robustes, légères et bien testées.
Apprécié également par les cellules d'architecture et les DSI, Spring permet d'avoir des applications bien découpées en couches, facilement maintenables et évolutives.
Cependant, si une configuration Spring simple est à la portée de tous, avoir une architecture Spring correcte, en comprendre le fonctionnement interne et connaître les fonctionnalités avancées du framework sont des tâches nettement plus ardues.
L'objectif de cette formation est de donner les bonnes bases pour comprendre les principaux aspects de Spring, de manière à ce que les participants soient capables de :
- Développer une application Spring complète (persistance, métier, validation, transactions, sécurité, Web, Ajax...).
- Comprendre le fonctionnement interne de Spring et donc être autonomes lorsqu'un bug ou une situation anormale se produit.
- Avoir intégré la philosophie de développement Spring, afin de pouvoir facilement prendre en main un sous-projet ou une fonctionnalité Spring qu'ils ne connaissent pas encore.
Ti sei perso nel caos di “props” ed “emit” della tua web app Vue.js? Usa Vuex!
Vuex è lo state manager di Vue.js per eccellenza, una singola fonte di verità che ottimizza la condivisione di informazioni tra componenti.
Vediamo come introdurre facilmente Vuex in progetti esistenti, con un occhio per il testing
NDC Sydney 2019 - Async Demystified -- Karel ZikmundKarel Zikmund
NDC Sydney 2019 conference in Sydney, AU - 2019/10/15
Talk: War stories from .NET team by Karel Zikmund
https://sessionize.com/s/karel-zikmund/async-demystified/24175
https://www.youtube.com/watch?v=TgUYcZV-foM
In Class AssignmetzCST280W13a-1.pdfCST 280 In-Class Pract.docxbradburgess22840
In Class Assignmetz/CST280W13a-1.pdf
CST 280 In-Class Practice – Week 13
Manually determine the configuration of the priority queue (stored as a heap) created
by the following operations. Trace the following logic and define the output:
enqueue(7);
enqueue(17);
enqueue(2);
enqueue(5);
enqueue(22);
enqueue(19);
enqueue(6);
enqueue(11);
enqueue(13);
write the queue contents
dequeue and write front item
enqueue(15);
enqueue(8);
dequeue and write front item
dequeue and write front item
enqueue(24);
enqueue(14);
write the queue contents
Part 2
Then, verify the output by implementing the algorithm by rewriting the priority
queue demonstration program discussed in class. Files needed:
testPQueue.cpp pqType.h heap.cpp
Deliverables
• This cover sheet (with your names on it)
• Driver source code and output for verification program exectution.
In Class Assignmetz/CST280W13b.pdf
CST 280 In-Class Practice – Week 13
Use this page as a worksheet to sketch the progression of the elements up to the first
split for the QuickSort algorithm. Use the middle array element as the split value:
15 34 99 42 11 41 66 23 55 93 48
Next, access the file quickSort.cpp from the course web page. Tailor the program
by entering the array values above in place of the integer values used for an in-class
demonstration. Be sure to adjust the index range to match the size of this array.
Remember that the parameters to the QuickSort algorithm are starting and ending index
values, not the size of the array.
Next, insert code to demonstrate the state of the array after the first split. This should
verify what you did by hand above. Insert the following code at various points within
the partition function to “see” the array at various stages of processing:
for (int i = start; i <= end; i++) // <== ADD
cout << set[i] << ' ';
cout << endl;
Insert the code at these positions:
int partition(int set[], int start, int end)
{
int pivotValue, pivotIndex, mid;
mid = (start + end) / 2;
swap(set[start], set[mid]);
pivotIndex = start;
pivotValue = set[start];
ç HERE
for (int scan = start + 1; scan <= end; scan++)
{
if (set[scan] < pivotValue)
{
pivotIndex++;
swap(set[pivotIndex], set[scan]);
}
ç HERE
}
swap(set[start], set[pivotIndex]);
ç HERE
return pivotIndex;
}
Finally, identify the line that matches what you concluded above.
Deliverables:
Deliver the following for this assignment:
• This work sheet with a sketch of the array first split
• Program source code with required change
• Program output demonstrating array configuration after first split .
Learn how to build RESTful API using Node JS with Express Js Framework. Database used is Mongo DB (Mongoose Library). Learn Step by step what is Node JS, Express, API and Mongo DB. Explain and sample code step to build RESTful API
Slides from the NestJS MasterClass.
We learned how to build JavaScript server-side applications with NestJS - A progressive NodeJS framework built with TypeScript.
You can find the code on GitHub:
https://github.com/nirkaufman/task-manager
Structured concurrency with Kotlin Coroutines
1. Theory
- Coroutines
- Suspending functions
- Asynchronous Flows
- Channels
2. Practice
- Business lookup feature implementation in TransferWise app for Android
Formation Spring Avancé gratuite par Ippon 2014Ippon
Spring est le principal framework de développement Java utilisé en entreprise. Ce succès tient au fait qu'il permet de développer facilement et rapidement des applications robustes, légères et bien testées.
Apprécié également par les cellules d'architecture et les DSI, Spring permet d'avoir des applications bien découpées en couches, facilement maintenables et évolutives.
Cependant, si une configuration Spring simple est à la portée de tous, avoir une architecture Spring correcte, en comprendre le fonctionnement interne et connaître les fonctionnalités avancées du framework sont des tâches nettement plus ardues.
L'objectif de cette formation est de donner les bonnes bases pour comprendre les principaux aspects de Spring, de manière à ce que les participants soient capables de :
- Développer une application Spring complète (persistance, métier, validation, transactions, sécurité, Web, Ajax...).
- Comprendre le fonctionnement interne de Spring et donc être autonomes lorsqu'un bug ou une situation anormale se produit.
- Avoir intégré la philosophie de développement Spring, afin de pouvoir facilement prendre en main un sous-projet ou une fonctionnalité Spring qu'ils ne connaissent pas encore.
Ti sei perso nel caos di “props” ed “emit” della tua web app Vue.js? Usa Vuex!
Vuex è lo state manager di Vue.js per eccellenza, una singola fonte di verità che ottimizza la condivisione di informazioni tra componenti.
Vediamo come introdurre facilmente Vuex in progetti esistenti, con un occhio per il testing
NDC Sydney 2019 - Async Demystified -- Karel ZikmundKarel Zikmund
NDC Sydney 2019 conference in Sydney, AU - 2019/10/15
Talk: War stories from .NET team by Karel Zikmund
https://sessionize.com/s/karel-zikmund/async-demystified/24175
https://www.youtube.com/watch?v=TgUYcZV-foM
In Class AssignmetzCST280W13a-1.pdfCST 280 In-Class Pract.docxbradburgess22840
In Class Assignmetz/CST280W13a-1.pdf
CST 280 In-Class Practice – Week 13
Manually determine the configuration of the priority queue (stored as a heap) created
by the following operations. Trace the following logic and define the output:
enqueue(7);
enqueue(17);
enqueue(2);
enqueue(5);
enqueue(22);
enqueue(19);
enqueue(6);
enqueue(11);
enqueue(13);
write the queue contents
dequeue and write front item
enqueue(15);
enqueue(8);
dequeue and write front item
dequeue and write front item
enqueue(24);
enqueue(14);
write the queue contents
Part 2
Then, verify the output by implementing the algorithm by rewriting the priority
queue demonstration program discussed in class. Files needed:
testPQueue.cpp pqType.h heap.cpp
Deliverables
• This cover sheet (with your names on it)
• Driver source code and output for verification program exectution.
In Class Assignmetz/CST280W13b.pdf
CST 280 In-Class Practice – Week 13
Use this page as a worksheet to sketch the progression of the elements up to the first
split for the QuickSort algorithm. Use the middle array element as the split value:
15 34 99 42 11 41 66 23 55 93 48
Next, access the file quickSort.cpp from the course web page. Tailor the program
by entering the array values above in place of the integer values used for an in-class
demonstration. Be sure to adjust the index range to match the size of this array.
Remember that the parameters to the QuickSort algorithm are starting and ending index
values, not the size of the array.
Next, insert code to demonstrate the state of the array after the first split. This should
verify what you did by hand above. Insert the following code at various points within
the partition function to “see” the array at various stages of processing:
for (int i = start; i <= end; i++) // <== ADD
cout << set[i] << ' ';
cout << endl;
Insert the code at these positions:
int partition(int set[], int start, int end)
{
int pivotValue, pivotIndex, mid;
mid = (start + end) / 2;
swap(set[start], set[mid]);
pivotIndex = start;
pivotValue = set[start];
ç HERE
for (int scan = start + 1; scan <= end; scan++)
{
if (set[scan] < pivotValue)
{
pivotIndex++;
swap(set[pivotIndex], set[scan]);
}
ç HERE
}
swap(set[start], set[pivotIndex]);
ç HERE
return pivotIndex;
}
Finally, identify the line that matches what you concluded above.
Deliverables:
Deliver the following for this assignment:
• This work sheet with a sketch of the array first split
• Program source code with required change
• Program output demonstrating array configuration after first split .
This presentation considers certain specific features of C++11 and additions to STL library (uniform initialization, new containers and methods, move semantics).
Presentation by Taras Protsiv (Software Engineer, GlobalLogic), Kyiv, delivered at GlobalLogic C++ TechTalk in Lviv, September 18, 2014.
More details -
http://www.globallogic.com.ua/press-releases/lviv-cpp-techtalk-coverage
Why we are submitting this talk? Because Go is cool and we would like to hear more about this language ;-). In this talk we would like to tell you about our experience with development of microservices with Go. Go enables devs to create readable, fast and concise code, this - beyond any doubt is important. Apart from this we would like to leverage our test driven habbits to create bulletproof software. We will also explore other aspects important for adoption of a new language.
Decoding Kotlin - Your guide to solving the mysterious in Kotlin.pptxJoão Esperancinha
These are the slides of the presentation I gave at the JetBrains HQ by the RAI in Amsterdam named "Decoding Kotlin - Your Guide to Solving the Mysterious in Kotlin". I want to express a big thank you to Xebia and JetBrains for the opportunity. I gave this presentation on the 24th of April 2024.
Kotlin coroutine - the next step for RxJava developer?Artur Latoszewski
Kotlin is a language that is rapidly gaining popularity, among others thanks to cooperation with Java. On the other hand, RxJava has brought us many solutions to problems related to asynchronous code. If everything is so cool, do we need anything else in the Kotlin world? Is Kotlin Coroutine a competition for RxJava?
Locks? We Don't Need No Stinkin' Locks - Michael BarkerJAX London
Embrace the dark side. As a developer you'll often be advised that writing concurrent code should be the purview of the genius coders alone. In this talk Michael Barker will discard that notion into the cesspits of logic and reason and attempt to present on the less understood area of non-blocking concurrency, i.e. concurrency without locks. We'll look the modern Intel CPU architecture, why we need a memory model, the performance costs of various non-blocking constructs and delve into the implementation details of the latest version of the Disruptor to see how non-blocking concurrency can be applied to build high performance data structures.
2. Asynchronous execution
void dispatch_async(dispatch_queue_t queue, dispatch_block_t block);
Submits a block for asynchronous execution on a dispatch queue and returns immediately.
void dispatch_sync(dispatch_queue_t queue, dispatch_block_t block);
Submits a block object for execution on a dispatch queue and waits until that block completes.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
/* The block to submit to the target dispatch queue. */
});
3. Running in separate thread
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
/* Run in background thread */
dispatch_sync(dispatch_get_main_queue(), ^{
/* Run in main thread
Waits until completes */
});
/* Continue in background thread */
});
5. Queues
• Serial (private dispatch queues)
Serial queues execute one task at a time in the order in which they are added
to the queue.
• Concurrent (global dispatch queue)
Concurrent queues execute one or more tasks concurrently
• Main dispatch queue
The main dispatch queue is a globally available serial queue that executes
tasks on the application’s main thread
6. Common queues
• Main queue (serial)
dispatch_get_main_queue() returns the main queue
• Concurrent queues with the specified quality of service class
1. DISPATCH_QUEUE_PRIORITY_HIGH
2. DISPATCH_QUEUE_PRIORITY_DEFAULT
3. DISPATCH_QUEUE_PRIORITY_LOW
4. DISPATCH_QUEUE_PRIORITY_BACKGROUND
dispatch_get_global_queue() returns a system-defined global concurrent
queue
8. Memory managment
• Before macOS 10.8 or iOS v6.0 – MRC
dispatch_retain(serialQueue);
dispatch_release(serialQueue);
• Later – ARC
9. Adding tasks to a queue
- (void)gcd {
dispatch_queue_t myCustomQueue;
myCustomQueue = dispatch_queue_create("com.example.MyCustomQueue", NULL);
dispatch_async(myCustomQueue, ^{
printf("Do some work here.n");
});
printf("The first block may or may not have run.n");
dispatch_sync(myCustomQueue, ^{
printf("Do some more work here.n");
});
printf("Both blocks have completed.n");
}
The first block may or may not have run.
Do some work here.
Do some more work here.
Both blocks have completed.
12. dispatch_time
/*!
* @typedef dispatch_time_t
*
* @abstract
* A somewhat abstract representation of time; where zero means "now" and
* DISPATCH_TIME_FOREVER means "infinity" and every value in between is an
* opaque encoding.
*/
typedef uint64_t dispatch_time_t;
#define DISPATCH_TIME_NOW (0ull)
#define DISPATCH_TIME_FOREVER (~0ull)
dispatch_time_t dispatch_time(dispatch_time_t when, int64_t delta);
Creates a dispatch_time_t relative to the default clock or modifies an existing dispatch_function_t.
• when – The value to use as the basis for a new value
• delta – The number of nanoseconds to add to the time in the when parameter.
20. Semaphore
dispatch_semaphore_t sema = dispatch_semaphore_create(0);
dispatch_queue_t queue = dispatch_queue_create("com.myapp.queue”,
DISPATCH_QUEUE_CONCURRENT);
dispatch_async(queue , ^{
NSLog(@"Looooooong opetation....");
[NSThread sleepForTimeInterval:2.0];
NSLog(@"signal");
dispatch_semaphore_signal(sema);
});
NSLog(@"wait for signal");
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
NSLog(@"some shit");
wait for signal
Looooooong opetation....
signal
some shit
21. dispatch_semaphore_t sema = dispatch_semaphore_create(0);
dispatch_queue_t queue = dispatch_queue_create("com.myapp.queue", DISPATCH_QUEUE_CONCURRENT);
dispatch_async(queue, ^{
NSLog(@”Diana is sleeping");
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
NSLog(@“Diana is waking up ;)");
[NSThread sleepForTimeInterval:1.0];
NSLog(@“Diana calls David!");
dispatch_semaphore_signal(sema);
});
dispatch_async(queue, ^{
NSLog(@”David is sleeping");
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
NSLog(@“David is waking up =)");
dispatch_semaphore_signal(sema);
[NSThread sleepForTimeInterval:1.0];
NSLog(@“David calls Diana!");
dispatch_semaphore_signal(sema);
});
dispatch_async(queue, ^{
[NSThread sleepForTimeInterval:2.0];
NSLog(@“They are sleeping");
NSLog(@”Nightmare");
dispatch_semaphore_signal(sema);
});
Diana is sleeping
David is sleeping
They are sleeping
Nightmare
Diana is waking up ;)
Diana calls David!
David is waking up =)
David calls Diana!
what happened if dispatch_semaphore_create(1)? Or (-1)?