CS 162 Fall 2015 Homework 1 Problems September 29, 2015 Timothy Johnson 1. Ex...parmeet834
CS 162 Fall 2015
Homework 1 Problems
September 29, 2015 Timothy Johnson
1. Exercise 2.2.4 on page 53 of Hopcroft et al. Give DFA’s accepting the following languages over the alphabet {0,1}. (a) The set of all strings ending in 0
SQL is a standard language for accessing and manipulating databases.
*What is SQL?
SQL stands for Structured Query Language
SQL lets you access and manipulate databases
SQL is an ANSI (American National Standards Institute) standard
*What Can SQL do?
SQL can execute queries against a database
SQL can retrieve data from a database
SQL can insert records in a database
SQL can update records in a database
SQL can delete records from a database
SQL can create new databases
SQL can create new tables in a database
CS 162 Fall 2015 Homework 1 Problems September 29, 2015 Timothy Johnson 1. Ex...parmeet834
CS 162 Fall 2015
Homework 1 Problems
September 29, 2015 Timothy Johnson
1. Exercise 2.2.4 on page 53 of Hopcroft et al. Give DFA’s accepting the following languages over the alphabet {0,1}. (a) The set of all strings ending in 0
SQL is a standard language for accessing and manipulating databases.
*What is SQL?
SQL stands for Structured Query Language
SQL lets you access and manipulate databases
SQL is an ANSI (American National Standards Institute) standard
*What Can SQL do?
SQL can execute queries against a database
SQL can retrieve data from a database
SQL can insert records in a database
SQL can update records in a database
SQL can delete records from a database
SQL can create new databases
SQL can create new tables in a database
Three Key Concepts for Understanding JSR-352: Batch Programming for the Java ...timfanelli
In this presentation, Tim Fanelli provides an introduction to JSR352 programming, and builds a simple application utilizing the JSR 352 chunk processing model.
The sample program presented may be downloaded here:
https://www.dropbox.com/s/55fsjt4ylny95hc/MySampleBatch.jar
Or, email Tim Fanelli - the contact information is on slide 3!
KubeCon EU 2016 Keynote: Pushing Kubernetes ForwardKubeAcademy
The Kubernetes community has aspirations of becoming the Linux kernel of distributed systems. Together we want to build a scalable, stable, and secure platform for distributed system that is the ubiquitous choice for people building server infrastructure. This talk will discuss the major community efforts made in recent months to deliver this goal and the work we need to do to continue our momentum.
Sched Link: http://sched.co/68lU
CBDW2014- Intro to CommandBox; The ColdFusion CLI, Package Manager, and REPL ...Ortus Solutions, Corp
CommandBox is a standalone, native tool for Windows, Mac, and Linux that will provide you with a Command Line Interface (CLI) for developer productivity, tool interaction, package management, embedded CFML server, application scaffolding, and some sweet ASCII art. It seamlessly integrates to work with any of the *Box products but it is also open for extensibility for any ColdFusion (CFML) project as it is also written in ColdFusion (CFML) using our concepts of CommandBox Commands.
CommandBox also functions as a package management tool which integrates seamlessly with ForgeBox, our community of ColdFusion (CFML) projects, but can also integrate with git,svn,http, ftp and many more code endpoints. Come learn about one of the coolest tools for CFML in years and how it can help your everyday productivity.
Interop 2018 - Understanding Kubernetes - Brian GracelyBrian Gracely
In the world of containers, Kubernetes has emerged as the dominant standard for managing how containers are deployed, monitored and managed. This talk will provide fundamental knowledge of how Kubernetes interacts with containers, storage, networking, security and application frameworks. The audience will learn about the core element of Kubernetes, including etcd, the Kubernetes API, the various types of controllers, and the Kubelet. In addition, we'll discuss the broad ecosystem of projects and technologies that make Kubernetes usable within the Enterprise, and across multiple cloud environments.
Running Airflow Workflows as ETL Processes on Hadoopclairvoyantllc
While working with Hadoop, you'll eventually encounter the need to schedule and run workflows to perform various operations like ingesting data or performing ETL. There are a number of tools available to assist you with this type of requirement and one such tool that we at Clairvoyant have been looking to use is Apache Airflow. Apache Airflow is an Apache Incubator project that allows you to programmatically create workflows through a python script. This provides a flexible and effective way to design your workflows with little code and setup. In this talk, we will discuss Apache Airflow and how we at Clairvoyant have utilized it for ETL pipelines on Hadoop.
Updating existing OpenCms installations to version 9.5 is straightforward using the provided update wizard.
OpenCms 9.5 provides several new tools in the “Advanced Direct Edit” (ADE) view, allowing content creators to work exclusively in that mode without the need to access the traditional workplace. In addition to this, new user roles have been added to OpenCms that allow more fine grained tuning of content manager permissions.
Michael shows how to introduce these new, optional roles in existing OpenCms installations after an update to version 9.5. Moreover, he explains how to integrate new features such as nested containers or on-the-fly PDF creation. Michael also points out potential pitfalls in the update process, related to changes in the core API that may require adjustments in your code.
Nebulaworks invited Bitnami's software engineer, Adnan Abdulhussein to present on, "The App Developer's Kubernetes Toolbox."
Details:
If you're developing applications on top of Kubernetes, you may be feeling overwhelmed with the vast number of development tools in the ecosystem at your disposal. Kubernetes is growing at a rapid pace, and it's becoming impossible to keep up with the latest and greatest development environments, debuggers, and build test and deployment tools.
Learn:
• The current state of development in Kubernetes
• Comparison of shared and local Kubernetes development environments
• Overview of different development tools in the ecosystem
• Which tools make sense in common scenarios
• How Bitnami uses Kubernetes as a development environment
Having used Jenkins with more than 30 projects during 8 years, it was time to switch to another build manager. Written in Ada, Porion is a new build manager intended to replace Jenkins by providing more security, safety and performance.
The presentation describes the complexity of designing a build manager. It highlights some security issues that apply to a build manager and its implementation. It explains the overall architecture that was chosen and the reason of the choice. Finally it presents the Ada generation tools that have been used in this project.
Mobile web apps shouldn't stop working when there's no network connection. Offline-enabled apps built using PouchDB can provide a better, faster user experience while potentially reducing battery and bandwidth usage.
Hear from Developer Advocate Glynn Bird to find out how to use the HTML5 Offline Application Cache, PouchDB, IBM Cloudant and Cordova/PhoneGap to develop fully-featured and cross-platform native apps and responsive mobile web apps that work just as well offline as they do online.
Three Key Concepts for Understanding JSR-352: Batch Programming for the Java ...timfanelli
In this presentation, Tim Fanelli provides an introduction to JSR352 programming, and builds a simple application utilizing the JSR 352 chunk processing model.
The sample program presented may be downloaded here:
https://www.dropbox.com/s/55fsjt4ylny95hc/MySampleBatch.jar
Or, email Tim Fanelli - the contact information is on slide 3!
KubeCon EU 2016 Keynote: Pushing Kubernetes ForwardKubeAcademy
The Kubernetes community has aspirations of becoming the Linux kernel of distributed systems. Together we want to build a scalable, stable, and secure platform for distributed system that is the ubiquitous choice for people building server infrastructure. This talk will discuss the major community efforts made in recent months to deliver this goal and the work we need to do to continue our momentum.
Sched Link: http://sched.co/68lU
CBDW2014- Intro to CommandBox; The ColdFusion CLI, Package Manager, and REPL ...Ortus Solutions, Corp
CommandBox is a standalone, native tool for Windows, Mac, and Linux that will provide you with a Command Line Interface (CLI) for developer productivity, tool interaction, package management, embedded CFML server, application scaffolding, and some sweet ASCII art. It seamlessly integrates to work with any of the *Box products but it is also open for extensibility for any ColdFusion (CFML) project as it is also written in ColdFusion (CFML) using our concepts of CommandBox Commands.
CommandBox also functions as a package management tool which integrates seamlessly with ForgeBox, our community of ColdFusion (CFML) projects, but can also integrate with git,svn,http, ftp and many more code endpoints. Come learn about one of the coolest tools for CFML in years and how it can help your everyday productivity.
Interop 2018 - Understanding Kubernetes - Brian GracelyBrian Gracely
In the world of containers, Kubernetes has emerged as the dominant standard for managing how containers are deployed, monitored and managed. This talk will provide fundamental knowledge of how Kubernetes interacts with containers, storage, networking, security and application frameworks. The audience will learn about the core element of Kubernetes, including etcd, the Kubernetes API, the various types of controllers, and the Kubelet. In addition, we'll discuss the broad ecosystem of projects and technologies that make Kubernetes usable within the Enterprise, and across multiple cloud environments.
Running Airflow Workflows as ETL Processes on Hadoopclairvoyantllc
While working with Hadoop, you'll eventually encounter the need to schedule and run workflows to perform various operations like ingesting data or performing ETL. There are a number of tools available to assist you with this type of requirement and one such tool that we at Clairvoyant have been looking to use is Apache Airflow. Apache Airflow is an Apache Incubator project that allows you to programmatically create workflows through a python script. This provides a flexible and effective way to design your workflows with little code and setup. In this talk, we will discuss Apache Airflow and how we at Clairvoyant have utilized it for ETL pipelines on Hadoop.
Updating existing OpenCms installations to version 9.5 is straightforward using the provided update wizard.
OpenCms 9.5 provides several new tools in the “Advanced Direct Edit” (ADE) view, allowing content creators to work exclusively in that mode without the need to access the traditional workplace. In addition to this, new user roles have been added to OpenCms that allow more fine grained tuning of content manager permissions.
Michael shows how to introduce these new, optional roles in existing OpenCms installations after an update to version 9.5. Moreover, he explains how to integrate new features such as nested containers or on-the-fly PDF creation. Michael also points out potential pitfalls in the update process, related to changes in the core API that may require adjustments in your code.
Nebulaworks invited Bitnami's software engineer, Adnan Abdulhussein to present on, "The App Developer's Kubernetes Toolbox."
Details:
If you're developing applications on top of Kubernetes, you may be feeling overwhelmed with the vast number of development tools in the ecosystem at your disposal. Kubernetes is growing at a rapid pace, and it's becoming impossible to keep up with the latest and greatest development environments, debuggers, and build test and deployment tools.
Learn:
• The current state of development in Kubernetes
• Comparison of shared and local Kubernetes development environments
• Overview of different development tools in the ecosystem
• Which tools make sense in common scenarios
• How Bitnami uses Kubernetes as a development environment
Having used Jenkins with more than 30 projects during 8 years, it was time to switch to another build manager. Written in Ada, Porion is a new build manager intended to replace Jenkins by providing more security, safety and performance.
The presentation describes the complexity of designing a build manager. It highlights some security issues that apply to a build manager and its implementation. It explains the overall architecture that was chosen and the reason of the choice. Finally it presents the Ada generation tools that have been used in this project.
Mobile web apps shouldn't stop working when there's no network connection. Offline-enabled apps built using PouchDB can provide a better, faster user experience while potentially reducing battery and bandwidth usage.
Hear from Developer Advocate Glynn Bird to find out how to use the HTML5 Offline Application Cache, PouchDB, IBM Cloudant and Cordova/PhoneGap to develop fully-featured and cross-platform native apps and responsive mobile web apps that work just as well offline as they do online.
Presentation from the CopenhagenR - useR Group Meetup at IT University of Copenhagen on Oct. 11 2016 on how to automatically deploy web applications built in R to a Cloud server (here DigitalOcean) using open source Docker with GitHub and basic Continuous Integration (here CircleCI) for automated testing and deployment.
Presenter:
Niels Ole Dam, Things in Flow
Excerpt from the invitation to the meetup:
Niels will talk about his favorite R-setup and will demonstrate how R, combined with some nice DockeR and Github tricks, can help even small teams and companies leverage the power of modern cloud computing. Niels uses R on a daily basis in his work as an independent consultant and he will share his thoughts on DockeR at the next meetup.
Subjects covered:
- How to setup and use RStudio, Docker, Docker Compose locally and with GitHub intgration.
- How to setup and use Continuous Integration (CI) with automated testing and deployment to DigitalOcean using CircelCI and with reuse of the same docker-compose.yml file locally and remotely.
- Tips and tricks on how to setup a good workflow.
- Introduction to all the technologies and tools used.
There are lots of clickable links in the pdf-version of the slides.
Code for the setup demonstrated can be found at:
https://github.com/thingsinflow/r-docker-workflow
An accompanying clickable flowdiagram can be found at:
http://bit.ly/R-Docker-workflow
Enjoy!
:-)
"NoSQL on the move" by Glynn Bird
Mobile-first app web development is a solved problem, but how can you websites and apps the continue to work with little or internet connectivity? Discover how Offline-first development allows apps to present an "always on" experience for their user
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
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.
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.
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/
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
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.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
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.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
2. 2
1. Introduction to Offline and Solutions
2. Start with an online ToDo application
3. Intro to PouchDB
4. Demo Offline application
5. Code Walkthrough - PouchDB APIs to make the app Offline
6. Further Enhancements
Agenda
3. 3
• Internet Reliability
• Remote areas covered by field workers
• Oil Drilling vessels using Satellite internet
Why Offline?
4. 4
Demo - Online Application
ToDo Application
https://github.com/UI5Con-Blore-OfflineUI5
5. 5
Communications of an UI5 app
● Static resources (UI5 Library and UI5 App)
● Data calls to the server
7. 7
How offline apps are built in the non-SAP world?
● Static resources (UI5 Library and UI5 App)
AppCache, ServiceWorker
Cordova, Electron
● Data calls to the server
LocalStorage, WebSQL, IndexedDB
PouchDB js library
8. 8
Intro to PouchDB
● What is PouchDB?
● Json Document Store
● Offline First Approach
● Progressive Web App (PWA)
● History
● Relational Database – "Column and Rows"
● Non Relational Database – CouchDb
● Instead of Fixed Schema there is only mapping of keys to document
9. 9
Advantages of PouchDB
● Supports using indexedDB
● Works across browsers
● Reduce query over the network
● Production version is just 46kb
● Supports WebSQL. So can be useful with Cordova
● PouchDB offers plugins for Cordova
● Ease of handling attachments
● Easy to learn
● Open Source
10. 10
Browser and platform supporting PouchDB
● Firefox 29+ (Including Firefox OS and Firefox for Android)
● Chrome 30+
● Safari 5+
● Internet Explorer 10+
● Opera 21+
● Android 4.0+
● iOS 7.1+
● Windows Phone 8+
11. 11
PouchDB APIs
Using db.put( ) :- Create a new document or update an existing document. If the document
already exists, you must specify its revision _rev.
12. 12
PouchDB APIs
● Using db.get(docId, [options], [callback]) :- Retrieves a document, specified
by docId.
17. 17
Architecture with PouchDB - Insert/Update/Delete
Update Operations
UI5 App
OData Model
GATEWAY SERVER
Local Data
Transactions
JSON Model
18. 18
Offline App Demo
● View PouchDB contents
● View sync call to the backend
https://github.com/UI5Con-Blore-OfflineUI5
19. 19
Using PouchDB - Adding to the UI5 project
Download from https://pouchdb.com/
Add in manifest.json (sap.ui5 -> resources -> js)
20. 20
Finding if Online
Using local event handlers – online/offline
● No xhr calls
● GW need not be available
Ping GW server (https://<gw server>/sap/bc/ping)
● Overhead for GW server
21. 21
Using PouchDB - How many databases?
One for storing the local data
One for storing a list of pending transactions
22. 22
Initial Query of ToDos - Pseudocode
1. Find the initial online status
2. Call Sync function
23. 23
Sync Operation
1. Fetch changes to be synced from transactionDB
2. For each change, trigger deferred OData changes
3. 'submitChanges' - Single batch call with multiple changesets
4. Clear the pending count
5. Clear the entries in transactionDB
6. If online, reload ToDos from the server
24. 24
Create operation
● Add to the pending transaction count
● Add new entry to the transactionDB
● Update the localDB, which in turn updates the JSON model to show the new entry in UI
● If online, trigger a sync
25. 25
Update Operation
● Add to the pending transaction count
● Add new entry to the transactionDB
● Update the localDB. If it is 'Done' operation, then remove the entry from JSON model
● If online, trigger a sync
26. 26
Enhancements
● Merging multiple changes on the same object
● Conflict Handling
● Using eTags
● Using AppCache, Service Worker for UI5 resources
● Using Cordova with PouchDB for a complete Offline app
● Using ServiceWorker/PouchDB for static value helps
