Java serialization
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The document discusses Java serialization, which allows objects to be saved as bytes that can be written to disk or transmitted over a network. It explains that serializing includes the object's entire graph, including attributes and contained objects that are also serializable. For a class to be serialized, it must implement the Serializable interface, have a no-arg constructor, and can optionally define a serialVersionUID for compatibility checks. The writeObject() and readObject() methods of ObjectOutputStream and ObjectInputStream are used to serialize and deserialize objects to and from a file.
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What is Serialization in Java? | Java Tutorial | Edureka
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ObjectLayout: Closing the (last?) inherent C vs. Java speed gap
ObjectLayout: Closing the (last?) inherent C vs. Java speed gap
More from Sujit Kumar
Introduction to OOP with java
This document provides an introduction to key object-oriented programming concepts in Java including abstraction, classes, objects, encapsulation, information hiding, access modifiers, constructors, and the toString() method. It defines classes as templates for objects that contain data and behavior, and objects as instances of classes that occupy memory. It also describes how encapsulation and information hiding are achieved in Java using access modifiers to hide implementation details while exposing public interfaces.
SFDC Database Basics
This document provides an overview of Force.com databases including standard and custom objects, fields, relationships, and querying. Key points include: standard objects contain core CRM data while custom objects are defined by developers; fields include standard, custom, and field types like auto-number, formula, and encrypted fields; relationships include lookups, master-details, and hierarchical relationships; and querying is done through SOQL for structured queries and SOSL for full-text search.
SFDC Database Security
This document provides an overview of Force.com database security. It discusses how security is implemented through profiles and permissions rather than coding. Key aspects covered include profiles and their permissions, field level security, record ownership, sharing models, and how to implement the security model.
SFDC Social Applications
This document provides an overview of social applications and Chatter concepts in Salesforce, including posts, comments, following records, feeds, groups, profiles, and integrating Chatter into custom Visualforce pages. It describes how to query, create, and delete different Chatter object types through the API and restrictions on using Chatter components in Visualforce.
SFDC Other Platform Features
This document provides an overview of various Force.com platform features including workflow and approvals, analytics, internationalization and localization, and single sign-on. It describes the key components of workflows, approval processes, reports, dashboards, and how to configure internationalization, federated single sign-on, and delegated single sign-on.
SFDC Outbound Integrations
This document provides an overview of outbound integrations from Salesforce, including configurable outbound messaging, Salesforce-to-Salesforce (S2S), calling external web services from Apex, and HTTP integrations. Outbound messaging allows sending data to external systems when records are created or updated in Salesforce. S2S enables sharing data between Salesforce orgs. Developers can generate Apex code to call external web services and integrate using HTTP requests directly.
SFDC Inbound Integrations
The document discusses various ways to integrate external systems with Salesforce, including Force.com Web Services, custom Apex web services, the Metadata API, and the REST API. Force.com Web Services allow accessing and modifying data and metadata via SOAP calls, while the Metadata API automates configuration changes. Custom Apex web services provide more control but require generating stubs from the WSDL. The REST API uses HTTP methods to act on Salesforce resources and authenticates differently than web services.
SFDC UI - Advanced Visualforce
The document provides an overview of key capabilities for building advanced user interfaces in Force.com, including:
1) Adding AJAX behavior to Visualforce pages through various components like actionFunction, actionPoller, and actionSupport.
2) Using partial page refresh with attributes like reRender to refresh parts of a page asynchronously.
3) Referencing static resources and templates to build reusable and modular Visualforce components.
4) Creating custom Visualforce components that can be reused across multiple pages.
5) Enabling public access to Visualforce pages through Sites and configuring authentication through portals.
SFDC UI - Introduction to Visualforce
This document provides an overview of the Force.com user interface and its model-view-controller (MVC) architecture. It describes the key components of the MVC pattern used in Visualforce pages, including controllers, views, and view components. It also explains standard controllers, controller extensions, and custom controllers, as well as common view components for data, actions, and user interface styling.
SFDC Deployments
This document provides an overview of Force.com deployments, including environments/organizations, development environments, deployment methods, and requirements. Key points include: there are various environments for development, testing, and production; deployments require at least 75% Apex code coverage by unit tests; common deployment methods include the Force.com IDE, ANT migration tool, change sets, and Dreamfactory Snapshot tool.
SFDC Batch Apex
This document provides an overview of Force.com Batch Apex, which allows processing of large data sets asynchronously by splitting the data into batches that are processed sequentially. Key aspects covered include the batchable interface with start, execute, and finish methods; splitting data into transactions of up to 200 records each; monitoring and error handling; making batches stateful; using query locators or iterables; testing and scheduling batches; and limitations of batch apex.
SFDC Data Loader
The document discusses various tools for loading and transferring data in Salesforce, including the Import Wizard for loading up to 50,000 standard and custom object records without programming; the Web Services API-based tools for loading more than 50,000 records and scheduling loads; and the Apex Data Loader as a fully supported product for importing, exporting, and using custom relationships for upserts. It also provides guidance on choosing between the Wizard and API tools based on factors like the objects, records, scheduling needs, and data sources/destinations involved.
SFDC Advanced Apex
This document provides an overview of advanced Apex features for querying and manipulating data in Salesforce including: aggregate SOQL functions like COUNT and SUM; SOQL joins, semi-joins, and anti-joins; SOSL for text searching; transaction processing with savepoints and record locking; and database DML methods for partial success of batch updates. It includes examples of using these features in Apex code to retrieve and update Salesforce data.
SFDC Introduction to Apex
This document provides an overview of Apex and Force.com development. It covers Apex language basics, data types, collections, exceptions, asynchronous execution, database integration, triggers, debugging, limits, and unit testing. Key topics include the similarities between Apex and Java, SOQL, DML statements, polymorphism in Apex, and the requirements to deploy code changes to production.
SFDC Database Additional Features
This document summarizes several additional database features in Force.com including dependent fields, record types and security, roll-up summary fields, field history tracking, tags, and connect offline. Dependent fields allow picklist values to depend on other values. Record types customize picklists and user interfaces for different record variations. Roll-up summary fields incrementally calculate summaries on child objects. Field history tracking provides an audit trail for certain fields. Tags and connect offline improve record search and offline data access.
Introduction to SalesForce
Force.com is a platform as a service that provides the infrastructure needed to build business applications in the cloud. It offers a multi-tenant architecture with shared infrastructure and automatic upgrades. Force.com provides a database, business logic platform called Apex, user interfaces, and integration capabilities. Developers can build custom user interfaces using Visual Force pages and integrate applications using web services, email, and APIs.
More about java strings - Immutability and String Pool
Strings in Java are immutable, meaning their values cannot be changed after creation. The String pool stores String literals in memory to share common Strings and reduce memory usage. While String objects themselves are immutable, references to Strings can point to different objects and are mutable.
Hibernate First and Second level caches
Hibernate provides two levels of caching for entities - a first level cache and a second level cache. The first level cache is active by default and caches entities within a session. The second level cache requires additional configuration and caches entities across sessions but within a single application. The document includes an example program demonstrating usage of Hibernate's second level cache.
Java equals hashCode Contract
The document discusses the contract between equals() and hashCode() methods in Java classes. It states that 2 equal objects must have the same hashCode, but the reverse may not be true. It then provides an example class Banana that implements equals() but not hashCode(), causing issues when used as a key in a HashMap. Finally, it discusses how to implement hashCode() to avoid collisions and improve performance.
Java Comparable and Comparator
The document discusses the differences between the Comparable and Comparator interfaces in Java. Comparable allows objects to be sorted based on natural ordering by implementing the compareTo() method. Comparator allows objects to be compared and sorted based on arbitrary criteria by implementing the compare() method. Guidelines are provided for when to use each interface, such as using Comparable for a class's natural ordering and Comparator when multiple orderings are possible or the class cannot be modified. Examples of implementing each are also included.
More from Sujit Kumar (20)
More about java strings - Immutability and String Pool
More about java strings - Immutability and String Pool
Recently uploaded
GlobalLogic Java Community Webinar #18 “How to Improve Web Application Perfor...
Під час доповіді відповімо на питання, навіщо потрібно підвищувати продуктивність аплікації і які є найефективніші способи для цього. А також поговоримо про те, що таке кеш, які його види бувають та, основне — як знайти performance bottleneck?
Відео та деталі заходу: https://bit.ly/45tILxj
Session 1 - Intro to Robotic Process Automation.pdf
👉 Check out our full 'Africa Series - Automation Student Developers (EN)' page to register for the full program:
https://bit.ly/Automation_Student_Kickstart
In this session, we shall introduce you to the world of automation, the UiPath Platform, and guide you on how to install and setup UiPath Studio on your Windows PC.
📕 Detailed agenda:
What is RPA? Benefits of RPA?
RPA Applications
The UiPath End-to-End Automation Platform
UiPath Studio CE Installation and Setup
💻 Extra training through UiPath Academy:
Introduction to Automation
UiPath Business Automation Platform
Explore automation development with UiPath Studio
👉 Register here for our upcoming Session 2 on June 20: Introduction to UiPath Studio Fundamentals: https://community.uipath.com/events/details/uipath-lagos-presents-session-2-introduction-to-uipath-studio-fundamentals/
Dandelion Hashtable: beyond billion requests per second on a commodity server
This slide deck presents DLHT, a concurrent in-memory hashtable. Despite efforts to optimize hashtables, that go as far as sacrificing core functionality, state-of-the-art designs still incur multiple memory accesses per request and block request processing in three cases. First, most hashtables block while waiting for data to be retrieved from memory. Second, open-addressing designs, which represent the current state-of-the-art, either cannot free index slots on deletes or must block all requests to do so. Third, index resizes block every request until all objects are copied to the new index. Defying folklore wisdom, DLHT forgoes open-addressing and adopts a fully-featured and memory-aware closed-addressing design based on bounded cache-line-chaining. This design offers lock-free index operations and deletes that free slots instantly, (2) completes most requests with a single memory access, (3) utilizes software prefetching to hide memory latencies, and (4) employs a novel non-blocking and parallel resizing. In a commodity server and a memory-resident workload, DLHT surpasses 1.6B requests per second and provides 3.5x (12x) the throughput of the state-of-the-art closed-addressing (open-addressing) resizable hashtable on Gets (Deletes).
AI in the Workplace Reskilling, Upskilling, and Future Work.pptx
Discover how AI is transforming the workplace and learn strategies for reskilling and upskilling employees to stay ahead. This comprehensive guide covers the impact of AI on jobs, essential skills for the future, and successful case studies from industry leaders. Embrace AI-driven changes, foster continuous learning, and build a future-ready workforce.
Read More - https://bit.ly/3VKly70
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We will talk about system monitoring from a few different angles. We will start by covering the basics, then discuss SLOs, how to define them, and why understanding the business well is crucial for success in this exercise.
Mutation Testing for Task-Oriented Chatbots
Conversational agents, or chatbots, are increasingly used to access all sorts of services using natural language. While open-domain chatbots - like ChatGPT - can converse on any topic, task-oriented chatbots - the focus of this paper - are designed for specific tasks, like booking a flight, obtaining customer support, or setting an appointment. Like any other software, task-oriented chatbots need to be properly tested, usually by defining and executing test scenarios (i.e., sequences of user-chatbot interactions). However, there is currently a lack of methods to quantify the completeness and strength of such test scenarios, which can lead to low-quality tests, and hence to buggy chatbots.
To fill this gap, we propose adapting mutation testing (MuT) for task-oriented chatbots. To this end, we introduce a set of mutation operators that emulate faults in chatbot designs, an architecture that enables MuT on chatbots built using heterogeneous technologies, and a practical realisation as an Eclipse plugin. Moreover, we evaluate the applicability, effectiveness and efficiency of our approach on open-source chatbots, with promising results.
Northern Engraving | Nameplate Manufacturing Process - 2024
Manufacturing custom quality metal nameplates and badges involves several standard operations. Processes include sheet prep, lithography, screening, coating, punch press and inspection. All decoration is completed in the flat sheet with adhesive and tooling operations following. The possibilities for creating unique durable nameplates are endless. How will you create your brand identity? We can help!
inQuba Webinar Mastering Customer Journey Management with Dr Graham Hill
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In this webinar, we explored essential aspects of Customer Journey Management and personalization. Here’s a summary of the key insights and topics discussed:
Key Takeaways:
Understanding the Customer Journey: Dr. Hill emphasized the importance of mapping and understanding the complete customer journey to identify touchpoints and opportunities for improvement.
Personalization Strategies: We discussed how to leverage data and insights to create personalized experiences that resonate with customers.
Technology Integration: Insights were shared on how inQuba’s advanced technology can streamline customer interactions and drive operational efficiency.
Demystifying Knowledge Management through Storytelling
The Department of Veteran Affairs (VA) invited Taylor Paschal, Knowledge & Information Management Consultant at Enterprise Knowledge, to speak at a Knowledge Management Lunch and Learn hosted on June 12, 2024. All Office of Administration staff were invited to attend and received professional development credit for participating in the voluntary event.
The objectives of the Lunch and Learn presentation were to:
- Review what KM ‘is’ and ‘isn’t’
- Understand the value of KM and the benefits of engaging
- Define and reflect on your “what’s in it for me?”
- Share actionable ways you can participate in Knowledge - - Capture & Transfer
What is an RPA CoE? Session 2 – CoE Roles
In this session, we will review the players involved in the CoE and how each role impacts opportunities.
Topics covered:
• What roles are essential?
• What place in the automation journey does each role play?
Speaker:
Chris Bolin, Senior Intelligent Automation Architect Anika Systems
Essentials of Automations: Exploring Attributes & Automation Parameters
Building automations in FME Flow can save time, money, and help businesses scale by eliminating data silos and providing data to stakeholders in real-time. One essential component to orchestrating complex automations is the use of attributes & automation parameters (both formerly known as “keys”). In fact, it’s unlikely you’ll ever build an Automation without using these components, but what exactly are they?
Attributes & automation parameters enable the automation author to pass data values from one automation component to the next. During this webinar, our FME Flow Specialists will cover leveraging the three types of these output attributes & parameters in FME Flow: Event, Custom, and Automation. As a bonus, they’ll also be making use of the Split-Merge Block functionality.
You’ll leave this webinar with a better understanding of how to maximize the potential of automations by making use of attributes & automation parameters, with the ultimate goal of setting your enterprise integration workflows up on autopilot.
What is an RPA CoE? Session 1 – CoE Vision
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Apps Break Data
How information systems are built or acquired puts information, which is what they should be about, in a secondary place. Our language adapted accordingly, and we no longer talk about information systems but applications. Applications evolved in a way to break data into diverse fragments, tightly coupled with applications and expensive to integrate. The result is technical debt, which is re-paid by taking even bigger "loans", resulting in an ever-increasing technical debt. Software engineering and procurement practices work in sync with market forces to maintain this trend. This talk demonstrates how natural this situation is. The question is: can something be done to reverse the trend?
JavaLand 2024: Application Development Green Masterplan
My presentation slides I used at JavaLand 2024
Introducing BoxLang : A new JVM language for productivity and modularity!
Just like life, our code must adapt to the ever changing world we live in. From one day coding for the web, to the next for our tablets or APIs or for running serverless applications. Multi-runtime development is the future of coding, the future is to be dynamic. Let us introduce you to BoxLang.
Dynamic. Modular. Productive.
BoxLang redefines development with its dynamic nature, empowering developers to craft expressive and functional code effortlessly. Its modular architecture prioritizes flexibility, allowing for seamless integration into existing ecosystems.
Interoperability at its Core
With 100% interoperability with Java, BoxLang seamlessly bridges the gap between traditional and modern development paradigms, unlocking new possibilities for innovation and collaboration.
Multi-Runtime
From the tiny 2m operating system binary to running on our pure Java web server, CommandBox, Jakarta EE, AWS Lambda, Microsoft Functions, Web Assembly, Android and more. BoxLang has been designed to enhance and adapt according to it's runnable runtime.
The Fusion of Modernity and Tradition
Experience the fusion of modern features inspired by CFML, Node, Ruby, Kotlin, Java, and Clojure, combined with the familiarity of Java bytecode compilation, making BoxLang a language of choice for forward-thinking developers.
Empowering Transition with Transpiler Support
Transitioning from CFML to BoxLang is seamless with our JIT transpiler, facilitating smooth migration and preserving existing code investments.
Unlocking Creativity with IDE Tools
Unleash your creativity with powerful IDE tools tailored for BoxLang, providing an intuitive development experience and streamlining your workflow. Join us as we embark on a journey to redefine JVM development. Welcome to the era of BoxLang.
Must Know Postgres Extension for DBA and Developer during Migration
Mydbops Opensource Database Meetup 16
Topic: Must-Know PostgreSQL Extensions for Developers and DBAs During Migration
Speaker: Deepak Mahto, Founder of DataCloudGaze Consulting
Date & Time: 8th June | 10 AM - 1 PM IST
Venue: Bangalore International Centre, Bangalore
Abstract: Discover how PostgreSQL extensions can be your secret weapon! This talk explores how key extensions enhance database capabilities and streamline the migration process for users moving from other relational databases like Oracle.
Key Takeaways:
* Learn about crucial extensions like oracle_fdw, pgtt, and pg_audit that ease migration complexities.
* Gain valuable strategies for implementing these extensions in PostgreSQL to achieve license freedom.
* Discover how these key extensions can empower both developers and DBAs during the migration process.
* Don't miss this chance to gain practical knowledge from an industry expert and stay updated on the latest open-source database trends.
Mydbops Managed Services specializes in taking the pain out of database management while optimizing performance. Since 2015, we have been providing top-notch support and assistance for the top three open-source databases: MySQL, MongoDB, and PostgreSQL.
Our team offers a wide range of services, including assistance, support, consulting, 24/7 operations, and expertise in all relevant technologies. We help organizations improve their database's performance, scalability, efficiency, and availability.
Contact us: info@mydbops.com
Visit: https://www.mydbops.com/
Follow us on LinkedIn: https://in.linkedin.com/company/mydbops
For more details and updates, please follow up the below links.
Meetup Page : https://www.meetup.com/mydbops-databa...
Twitter: https://twitter.com/mydbopsofficial
Blogs: https://www.mydbops.com/blog/
Facebook(Meta): https://www.facebook.com/mydbops/
Day 2 - Intro to UiPath Studio Fundamentals
In our second session, we shall learn all about the main features and fundamentals of UiPath Studio that enable us to use the building blocks for any automation project.
📕 Detailed agenda:
Variables and Datatypes
Workflow Layouts
Arguments
Control Flows and Loops
Conditional Statements
💻 Extra training through UiPath Academy:
Variables, Constants, and Arguments in Studio
Control Flow in Studio
"Scaling RAG Applications to serve millions of users", Kevin Goedecke
How we managed to grow and scale a RAG application from zero to thousands of users in 7 months. Lessons from technical challenges around managing high load for LLMs, RAGs and Vector databases.
Connector Corner: Seamlessly power UiPath Apps, GenAI with prebuilt connectors
Join us to learn how UiPath Apps can directly and easily interact with prebuilt connectors via Integration Service--including Salesforce, ServiceNow, Open GenAI, and more.
The best part is you can achieve this without building a custom workflow! Say goodbye to the hassle of using separate automations to call APIs. By seamlessly integrating within App Studio, you can now easily streamline your workflow, while gaining direct access to our Connector Catalog of popular applications.
We’ll discuss and demo the benefits of UiPath Apps and connectors including:
Creating a compelling user experience for any software, without the limitations of APIs.
Accelerating the app creation process, saving time and effort
Enjoying high-performance CRUD (create, read, update, delete) operations, for
seamless data management.
Speakers:
Russell Alfeche, Technology Leader, RPA at qBotic and UiPath MVP
Charlie Greenberg, host
Recently uploaded (20)
GlobalLogic Java Community Webinar #18 “How to Improve Web Application Perfor...
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Session 1 - Intro to Robotic Process Automation.pdf
Session 1 - Intro to Robotic Process Automation.pdf
Dandelion Hashtable: beyond billion requests per second on a commodity server
Dandelion Hashtable: beyond billion requests per second on a commodity server
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Northern Engraving | Nameplate Manufacturing Process - 2024
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Demystifying Knowledge Management through Storytelling
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Essentials of Automations: Exploring Attributes & Automation Parameters
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JavaLand 2024: Application Development Green Masterplan
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Introducing BoxLang : A new JVM language for productivity and modularity!
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Must Know Postgres Extension for DBA and Developer during Migration
"Scaling RAG Applications to serve millions of users", Kevin Goedecke
"Scaling RAG Applications to serve millions of users", Kevin Goedecke
Connector Corner: Seamlessly power UiPath Apps, GenAI with prebuilt connectors
Connector Corner: Seamlessly power UiPath Apps, GenAI with prebuilt connectors
Java serialization
- 1. Java Serialization Sujit Kumar Zenolocity LLC Copyright 2012 – 2050 @
- 2. Serializable Interface • Marker Interface => No methods. • Indicates that objects of the class can be persisted (saved) as bytes on disk or transmitted over the network as bytes. • Objects can be reconstructed using the bytes saved on disk or bytes received over the network.
- 3. What does Serializable include? • The entire object graph => current object, super class attributes and objects contained within the current object. • Includes all the instance attributes (objects or primitive types) from the object which are also serializable. • Includes all the instance attributes from the super classes which are serializable. • Excluded instance attributes marked as transient.
- 4. Requirements • Class should implement the serializable interface. • Class should have a no argument constructor. • serialVersionUID (static final long) is optional but recommended. Represents the version number of the class and checks compatibility of serialized objects with the current version of the class.
- 5. How to serialize & deserialize? • ObjectOutputStream => writeObject() • Saving to a file on disk => Wrap a FileOutputStream with an ObjectOutputStream. • ObjectInputStream => readObject() • Read from a file on disk => Wrap a FileInputStream with an ObjectInputStream.