This document discusses Grails services, including:
- Services are used to separate business logic from controllers and provide transaction support.
- Services can be created using the "grails create-service" command and are transactional by default.
- Methods on services can be annotated with @Transactional to control transaction behavior on a per-method level.
- Services provide dependency injection and support different scopes like prototype, request, and singleton.
Services in Grails are the place to put the majority of the logic in your application, leaving controllers responsible for handling request flow with redirects and so on.
- What is redux ?
- Redux Principles
- Data Flow in Redux
- Understanding Action, Reducers, Store
- Data flow in React-Redux App
- Demo
Redux Utilities
Services in Grails are the place to put the majority of the logic in your application, leaving controllers responsible for handling request flow with redirects and so on.
- What is redux ?
- Redux Principles
- Data Flow in Redux
- Understanding Action, Reducers, Store
- Data flow in React-Redux App
- Demo
Redux Utilities
This is the first half of a presentation I gave at Squares Conference 2015 where I provided a brief introduction to React JS, then did live coding for 20 minutes to show more of the specifics of usage. Your milage may vary as the live code part was where the bulk of the teaching happened!
Around us everything goes through a cycle of taking birth, growing and at some point in time it will die.
Consider trees, any software application, yourself, a div container or UI component in a web browser, each of these takes birth, grows by getting updates and dies.
The lifecycle methods are various methods which are invoked at different phases of the lifecycle of a component.
The React component goes through the following phases
1) Initialization
2) Mounting
3) Update
4) Unmounting
Breaking the Server-Client Divide with Node.js and ReactDejan Glozic
Rendering Web applications server or client side has been a war for years, with server side proponents citing 'speed to glass' and SEO, and client side boasting speed of transitions after the upfront cost, and desktop-like application feel. For a while it was necessary to pick sides, that is until React. In this talk, I will show a stack we are using in IBM Cloud Data Services that uses Node.js and React to bring the best of both worlds in isomorphic apps. Server or client? Yes!
Asynchronous JavaScript Programming with Callbacks & PromisesHùng Nguyễn Huy
This presentation is about JavaScript Promise. Topics covered in this session are:
1. Asynchronous processing in JavaScript
2. Callbacks and Callback hell
3. Promises arrive in JavaScript!
4. Constructing a Promise
5. Promise states
6. Promises chaining and transformation
7. Error handling
8. Promise.all() and Promise.race()
Learn how to develop front-end JavaScript web applications using React and Redux for the application architecture. Immutability and one-way data binding at it's finest. Focus on components and state management without all the hassle.
Code examples available here: https://github.com/kinabalu/mysticpaste_react_example
Introduction to React, Flux, and Isomorphic AppsFederico Torre
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An autonomous transaction has its own COMMIT and ROLLBACK scope to ensure that its outcome does not effect the caller’s uncommitted changes. Additionally, the COMMITs and ROLLBACK in the calling transaction should not effect the changes that were finalized on the completion of autonomous transaction itself.
This is the first half of a presentation I gave at Squares Conference 2015 where I provided a brief introduction to React JS, then did live coding for 20 minutes to show more of the specifics of usage. Your milage may vary as the live code part was where the bulk of the teaching happened!
Around us everything goes through a cycle of taking birth, growing and at some point in time it will die.
Consider trees, any software application, yourself, a div container or UI component in a web browser, each of these takes birth, grows by getting updates and dies.
The lifecycle methods are various methods which are invoked at different phases of the lifecycle of a component.
The React component goes through the following phases
1) Initialization
2) Mounting
3) Update
4) Unmounting
Breaking the Server-Client Divide with Node.js and ReactDejan Glozic
Rendering Web applications server or client side has been a war for years, with server side proponents citing 'speed to glass' and SEO, and client side boasting speed of transitions after the upfront cost, and desktop-like application feel. For a while it was necessary to pick sides, that is until React. In this talk, I will show a stack we are using in IBM Cloud Data Services that uses Node.js and React to bring the best of both worlds in isomorphic apps. Server or client? Yes!
Asynchronous JavaScript Programming with Callbacks & PromisesHùng Nguyễn Huy
This presentation is about JavaScript Promise. Topics covered in this session are:
1. Asynchronous processing in JavaScript
2. Callbacks and Callback hell
3. Promises arrive in JavaScript!
4. Constructing a Promise
5. Promise states
6. Promises chaining and transformation
7. Error handling
8. Promise.all() and Promise.race()
Learn how to develop front-end JavaScript web applications using React and Redux for the application architecture. Immutability and one-way data binding at it's finest. Focus on components and state management without all the hassle.
Code examples available here: https://github.com/kinabalu/mysticpaste_react_example
Introduction to React, Flux, and Isomorphic AppsFederico Torre
A quick introduction to Facebook's react.js framework. This deck covers react components, flux architecture, and how to build an isomorphic application.
An autonomous transaction has its own COMMIT and ROLLBACK scope to ensure that its outcome does not effect the caller’s uncommitted changes. Additionally, the COMMITs and ROLLBACK in the calling transaction should not effect the changes that were finalized on the completion of autonomous transaction itself.
Transaction processing is very important and also necessary to maintain data integrity in both your application and database.
The transaction design patterns that are described in the next are :
Client Owner Transaction Design Pattern
Domain Service Owner Transaction Design Pattern
Server Delegate Owner Transaction Design Pattern
Transaction management in Java does not have to be complicated using the transaction design patterns described in this chapter makes transaction processing easy to understand, implement, and maintain.
Our technical advisor Niniane Wang shares lessons learned from being the VP Engineering at Niantic overseeing Pokémon GO and Harry Potter: Wizards Unite, CTO of Minted during numerous TV and viral consumer moments, and an engineering leader for a number of product launches on Gmail and other Google products.
Different patterns of microservices explored in one of my talks.
The main purpose of the talk is to present different types of "microservice patterns" exists at different levels. Talk focuses on some of the patterns in detail and some of them very high level to keep the content well within the time.
Following are the patterns explored with the help of eCommerce example.
"decompose by domain", "stranger", "database per service", "synchronous and asynchronous" patterns, "circuit breaker", "sidecar", "orchestrator", "choreography", "saga" and discovery patterns.
Thanks to EverestEngineering for conducting such a nice event in Hyderabad, India. All the talks and the related content is published at below link.
https://everest.engineering/#post-events
+ What is domain logic?
+ Domain logic patterns:
* Transaction script
* Domain model
* Table module
* Service layer
+ Conclusion
by Pavlo Livchak, Software Engineer at ElifTech
JS Fest 2019/Autumn. Anton Cherednikov. Choreographic or orchestral architect...JSFestUA
When we developing a loosely coupled and reusable application, often arises the question: how to arrange to communicate between services or applications? To a large extent, it depends on the nature of the request and the granularity of your applications or services.
We will discuss the two classic microservice integration patterns: service choreography and orchestration.
What is the difference between these two modes of communication? Which one we should use? How to ensure data consistency? How to implement disturbed transactions?
We will discuss these issues, consider an example of implementing orchestration on nodejs, and of course we will not forget about logging, monitoring and alerting.
Outsystems community meetup 2018 11 service modulesProvidit
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Presented by Didier Leroy from Providit.
Guidelines and Best Practices for Sencha ProjectsAmitaSuri
This presentation lists some useful guidelines and best practices to be followed while developing Sencha projects. These points would surely increase the performance of an Ext JS application in terms of memory and time.
- My presentation in faculty of computers and artficial intelligence, cairo university on Serverless Computing model
- And How to migrate your application to serverless computing model and to a cloud service like AWS that serves that serverless model
TAG | Southern California's Premier NetSuite Solution Provider | Presents "NetSuite SuiteFlow 101" by Adam Baruh, Director of NetSuite Professional Services, NetSuite Certified SuiteCloud Developer. In this slideshow, learn WorkFlow basics: what is a WorkFlow and what can I do with WorkFlows. WorkFlows vs. Scripts. Case studies and demos featuring Customer Approval WorkFlow and Sales Order Approval WorkFlows.
#NetSuite tips and tricks.
'How to build efficient backend based on microservice architecture' by Anton ...OdessaJS Conf
This speech about micro-services, approaches, and practices in their construction. How to effectively build communication between micro-services and what approaches are commonly used for this.
We will talk a little about distributed transactions. Will touch the topic of infrastructure, monitoring, and scaling components. I want to inspire my listeners to develop themselves in the direction of backend development. Force to look towards scalable application architecture.
You cannot find this information in the documentation :) This speech will also consist of real-life examples.
It is a build tool that puts all of your assets, including Javascript, images, fonts,
CSS, in a dependency graph.
It lets us use require() in our source code to point to local files, like images.
We can decide how they’re processed in our final javascript bundle, like
replacing the path with a URL.
Groovy 3.0 has introduced a lot of features from Java 7 and 8. Here are some features try-with-resource, identity common comparison,!in, !instanceof, etc.
Jython is an implementation of Python for the JVM.
It takes the Python programming languages syntax and enables it to run on the Java Platform.
Most of the Python modules will run without changes under Jython, but if they use extensions then they will probably not work.
Vert.x is a toolkit or platform for implementing reactive applications on the JVM.
General Purpose Application Framework
Polyglot (Java, Groovy, Scala, Kotlin, JavaScript, Ruby and Ceylon)
Event Driven, non-blocking
Lightweight & fast
Reusable modules.
Listen to the keynote address and hear about the latest developments from Rachana Ananthakrishnan and Ian Foster who review the updates to the Globus Platform and Service, and the relevance of Globus to the scientific community as an automation platform to accelerate scientific discovery.
Quarkus Hidden and Forbidden ExtensionsMax Andersen
Quarkus has a vast extension ecosystem and is known for its subsonic and subatomic feature set. Some of these features are not as well known, and some extensions are less talked about, but that does not make them less interesting - quite the opposite.
Come join this talk to see some tips and tricks for using Quarkus and some of the lesser known features, extensions and development techniques.
Check out the webinar slides to learn more about how XfilesPro transforms Salesforce document management by leveraging its world-class applications. For more details, please connect with sales@xfilespro.com
If you want to watch the on-demand webinar, please click here: https://www.xfilespro.com/webinars/salesforce-document-management-2-0-smarter-faster-better/
Accelerate Enterprise Software Engineering with PlatformlessWSO2
Key takeaways:
Challenges of building platforms and the benefits of platformless.
Key principles of platformless, including API-first, cloud-native middleware, platform engineering, and developer experience.
How Choreo enables the platformless experience.
How key concepts like application architecture, domain-driven design, zero trust, and cell-based architecture are inherently a part of Choreo.
Demo of an end-to-end app built and deployed on Choreo.
OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoamtakuyayamamoto1800
In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
Exploring Innovations in Data Repository Solutions - Insights from the U.S. G...Globus
The U.S. Geological Survey (USGS) has made substantial investments in meeting evolving scientific, technical, and policy driven demands on storing, managing, and delivering data. As these demands continue to grow in complexity and scale, the USGS must continue to explore innovative solutions to improve its management, curation, sharing, delivering, and preservation approaches for large-scale research data. Supporting these needs, the USGS has partnered with the University of Chicago-Globus to research and develop advanced repository components and workflows leveraging its current investment in Globus. The primary outcome of this partnership includes the development of a prototype enterprise repository, driven by USGS Data Release requirements, through exploration and implementation of the entire suite of the Globus platform offerings, including Globus Flow, Globus Auth, Globus Transfer, and Globus Search. This presentation will provide insights into this research partnership, introduce the unique requirements and challenges being addressed and provide relevant project progress.
How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
Designing for Privacy in Amazon Web ServicesKrzysztofKkol1
Data privacy is one of the most critical issues that businesses face. This presentation shares insights on the principles and best practices for ensuring the resilience and security of your workload.
Drawing on a real-life project from the HR industry, the various challenges will be demonstrated: data protection, self-healing, business continuity, security, and transparency of data processing. This systematized approach allowed to create a secure AWS cloud infrastructure that not only met strict compliance rules but also exceeded the client's expectations.
SOCRadar Research Team: Latest Activities of IntelBrokerSOCRadar
The European Union Agency for Law Enforcement Cooperation (Europol) has suffered an alleged data breach after a notorious threat actor claimed to have exfiltrated data from its systems. Infamous data leaker IntelBroker posted on the even more infamous BreachForums hacking forum, saying that Europol suffered a data breach this month.
The alleged breach affected Europol agencies CCSE, EC3, Europol Platform for Experts, Law Enforcement Forum, and SIRIUS. Infiltration of these entities can disrupt ongoing investigations and compromise sensitive intelligence shared among international law enforcement agencies.
However, this is neither the first nor the last activity of IntekBroker. We have compiled for you what happened in the last few days. To track such hacker activities on dark web sources like hacker forums, private Telegram channels, and other hidden platforms where cyber threats often originate, you can check SOCRadar’s Dark Web News.
Stay Informed on Threat Actors’ Activity on the Dark Web with SOCRadar!
Why React Native as a Strategic Advantage for Startup Innovation.pdfayushiqss
Do you know that React Native is being increasingly adopted by startups as well as big companies in the mobile app development industry? Big names like Facebook, Instagram, and Pinterest have already integrated this robust open-source framework.
In fact, according to a report by Statista, the number of React Native developers has been steadily increasing over the years, reaching an estimated 1.9 million by the end of 2024. This means that the demand for this framework in the job market has been growing making it a valuable skill.
But what makes React Native so popular for mobile application development? It offers excellent cross-platform capabilities among other benefits. This way, with React Native, developers can write code once and run it on both iOS and Android devices thus saving time and resources leading to shorter development cycles hence faster time-to-market for your app.
Let’s take the example of a startup, which wanted to release their app on both iOS and Android at once. Through the use of React Native they managed to create an app and bring it into the market within a very short period. This helped them gain an advantage over their competitors because they had access to a large user base who were able to generate revenue quickly for them.
Climate Science Flows: Enabling Petabyte-Scale Climate Analysis with the Eart...Globus
The Earth System Grid Federation (ESGF) is a global network of data servers that archives and distributes the planet’s largest collection of Earth system model output for thousands of climate and environmental scientists worldwide. Many of these petabyte-scale data archives are located in proximity to large high-performance computing (HPC) or cloud computing resources, but the primary workflow for data users consists of transferring data, and applying computations on a different system. As a part of the ESGF 2.0 US project (funded by the United States Department of Energy Office of Science), we developed pre-defined data workflows, which can be run on-demand, capable of applying many data reduction and data analysis to the large ESGF data archives, transferring only the resultant analysis (ex. visualizations, smaller data files). In this talk, we will showcase a few of these workflows, highlighting how Globus Flows can be used for petabyte-scale climate analysis.
Multiple Your Crypto Portfolio with the Innovative Features of Advanced Crypt...Hivelance Technology
Cryptocurrency trading bots are computer programs designed to automate buying, selling, and managing cryptocurrency transactions. These bots utilize advanced algorithms and machine learning techniques to analyze market data, identify trading opportunities, and execute trades on behalf of their users. By automating the decision-making process, crypto trading bots can react to market changes faster than human traders
Hivelance, a leading provider of cryptocurrency trading bot development services, stands out as the premier choice for crypto traders and developers. Hivelance boasts a team of seasoned cryptocurrency experts and software engineers who deeply understand the crypto market and the latest trends in automated trading, Hivelance leverages the latest technologies and tools in the industry, including advanced AI and machine learning algorithms, to create highly efficient and adaptable crypto trading bots
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Venez le découvrir lors de cette session ignite
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Worried about document security while sharing them in Salesforce? Fret no more! Here are the top-notch security standards XfilesPro upholds to ensure strong security for your Salesforce documents while sharing with internal or external people.
To learn more, read the blog: https://www.xfilespro.com/how-does-xfilespro-make-document-sharing-secure-and-seamless-in-salesforce/
Into the Box Keynote Day 2: Unveiling amazing updates and announcements for modern CFML developers! Get ready for exciting releases and updates on Ortus tools and products. Stay tuned for cutting-edge innovations designed to boost your productivity.
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Field Employee Tracking System| MiTrack App| Best Employee Tracking Solution|...informapgpstrackings
Keep tabs on your field staff effortlessly with Informap Technology Centre LLC. Real-time tracking, task assignment, and smart features for efficient management. Request a live demo today!
For more details, visit us : https://informapuae.com/field-staff-tracking/
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2. Agenda
● Separation of concern
● Controller’s Responsibility
● Introduction of Service
● Create a Service
● Declaratives Transaction
● Transactions Rollback and Session
● Scoped Services
● Dependency Injection and Services
● Using Services from java
● Injecting a Service
5. “Consider this analogy: Imagine a company where employees are assigned tasks on different nature of
work.
Consider Employee has following responsibility
● Handle accounting and releasing of check payments
● Take calls from customers for product support
● Handle administrative tasks such as booking flights plus accommodation of executives
● Manage the schedule of the CEO
Problem with this
1. Complicated to John
2. He have to change his frame of mind
3. It’s not easy to replace that employee
7. Consider a controller in Grails. Inside a controller, we can do the following:
● Handle routing logic
● Invoke GORM operations to manipulate data in the database
● Render text and show it to the user.
The real purpose of a controller is to deal with routing logic- which means
✘ Receive requests from users
✘ Invoke the most appropriate business logic
✘ Invoke the view to display the result
9. ✘ All Business logic should be implemented in service layer.
✘ Grails has default support and handling for the service Layer.
✘ Services in Grails are the place to put the majority of the logic in your application, leaving
controllers responsible for handling request flow with redirects and so on.
11. grails create-service [package_name] [service_name]
A service's name ends with the convention Service,
other than that a service is a plain Groovy class
package com
class PublicService{
}
It will create two files:-
PublicService (Inside service folder)
PublicServiceSpec (Inside test folder)
grails create-service com Public
def publicService
13. Services are typically involved with coordinating logic between domain classes, and hence often involved with
persistence that spans large operations.
The nature of services, they frequently require transactional behaviour.
All services are transactional by default. To disable this set the transactional property to false
Note*:- Dependency is the only way that declarative transactions work. You will not get transactional behaviour if you
use new operator such as new PublicService()
The result is that all methods are wrapped in a transaction and automatic rollback occurs if a method throws a runtime
exception (i.e. one that extends RuntimeException) or an Error.
class PublicService{
static transactional = false
}
14. Custom Transaction Configuration
Grails also provides @Transactional and @NotTransactional annotations for cases:-
x Where you need more fine-grained control over transactions at a per-method level
x Need to specify an alternative propagation level.
x For example, the @NotTransactional annotation can be used to mark a particular method to be
skipped when a class is annotated with @Transactional.
class BookService{
@Transactional(readOnly=true)
def listBook(){
Book.list()
}
}
16. ✘ Transaction is a very important concept. Hope you are well aware of ACID(Atomicity, Consistency,
Isolation, Durability) properties .
✘ Usually we wish certain sequence of database changes to be successful. If not possible we want no
operation to happen at all.
✘ Imagine a code that deducts money from one account (accountFrom.balance =
accountFrom.balance - amount), and adds money to another account (accountTo.balance =
accountTo.balance + amount). Imagine if something happened (an Exception) after deducting from
the source account and the destination account was not updated. Money will be lost and not
accounted for. For this type of codes, we want an "all or nothing" behavior. This concept is also called
atomicity.
✘ Since Grails supports transactions, it automatically do these things to us when we declare a service
to be transactional:
○ If all db operations are successful, reflect the changes to the database (this is also called commit) •
○ If one db operation result in exception, return to the original state and forget/undo all the previous operations
(this is also called rollback) •
✘ By default all services are transactional, if you don’t want transactional behavior of the service you
can get rid of it by class TestService(){ static transactional=false }
17. ✘ When a transaction is rolled back the Hibernate Session used by GORM is cleared.
✘ Means an object within the session become detached and accessing uninitialized lazy-loaded
collections will lead to LazyInitiallizationExceptions.
19. By default, access to service methods is not synchronized, so nothing prevents concurrent execution of
those methods. In fact, because the service is a singleton and may be used concurrently, you should be
very careful about storing state in a service.
You can change this behaviour by placing a service in a particular scope. The supported scopes are:
● prototype - A new service is created every time it is injected into another class
● request - A new service will be created per request
● flash - A new service will be created for the current and next request only
● flow - In web flows the service will exist for the scope of the flow
● conversation - In web flows the service will exist for the scope of the conversation. ie a root flow
and its sub flows
● session - A service is created for the scope of a user session
● singleton (default) - Only one instance of the service ever exists
21. A key aspect of Grails services is the ability to use Spring Framework's dependency injection features.
Grails supports "dependency injection by convention".
you can use the property name representation of the class name of a service to automatically inject them
into controllers, tag libraries, and so on.
class BookController{
def bookService
{
class BookController{
BookService bookService
{
class AuthorService{
def bookService
}