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value | Question stringlengths 42 102 | Answer stringlengths 44 199 |
|---|---|---|
Conduent | What is the primary objective of the Revenue Modernization web application? | The primary objective is to provide a modern web design for NJ transit revenue auditors to view and audit duties and transactions, manage data, generate reports, and provide analytics. |
Conduent | What is the purpose of the IOT ROS2 Lane App in the OBO Modernization project? | The IOT ROS2 Lane App generates various types of transactions with JSON schemas, which are sent to a queue (Kafka or Event Hub) for consumption and transformation by the OBO transaction service. |
Conduent | Who manages the Conduent Software Development Lifecycle Approach (SDLA) template used in the document? | The Conduent SDLC Competency Center manages the SDLA and governs the configuration management of the template. |
Conduent | What technologies are used in the front-end layer of the Revenue Modernization application? | The front-end layer uses React JS V18.0, Redux for state management, and CSS3 for styling. |
Conduent | What is the role of Node.js in the system architecture? | Node.js serves as the orchestration layer, connecting the front-end with the backend, orchestrating microservices, parsing data, and handling presentation-based business logic. |
Conduent | Which framework is used for implementing the service layer in the application? | The service layer is implemented using Java V21, Spring Boot V3.2.x, Spring Data JPA, and Kafka. |
Conduent | What database is used for data persistence in the Revenue Modernization application? | MySQL database is used for data persistence. |
Conduent | How is reporting handled in the application? | Reporting is handled using Power BI, which generates reports in PDF and CSV formats and supports embedding visual reports in the web application. |
Conduent | How does React JS enforce UI development in the application? | React JS enforces a component-based approach, using JSX reusable components to build UI screens, with CSS3 applying state-specific themes. |
Conduent | How is static content managed in the front-end? | Static content and field-specific information are maintained in JSON files, which React components use to render content, reducing maintenance for minor enhancements. |
Conduent | What is the benefit of using Node.js as an orchestration layer during the second phase of development? | Node.js allows the front-end to remain unchanged when the backend and database are merged, requiring changes only in the Node layer. |
Conduent | How does Spring Boot streamline the development of microservices? | Spring Boot provides sensible defaults and auto-configurations, streamlining setup and configuration of Java-based web applications using a microservice pattern with REST APIs. |
Conduent | What is the role of Spring Data JPA in the service layer? | Spring Data JPA simplifies database interactions by using Java Persistence API, offering features like automatic repository creation for fetching and updating data. |
Conduent | What is Apache Kafka used for in the application? | Apache Kafka streams transactional data from an ATP source, publishes events for consumption, and decouples data producers and consumers for scalability and fault tolerance. |
Conduent | What are the key features of Spring Batch used in the application? | Spring Batch supports chunk-oriented processing, robust transaction management, and restartability for tasks like report generation and purging old transactions. |
Conduent | How does Spring Scheduler automate tasks in the application? | Spring Scheduler executes Spring Batch tasks at predefined times or intervals using fixed delays or CRON expressions. |
Conduent | How is user authentication implemented in the Revenue Modernization application? | User authentication is implemented using Azure Active Directory, which generates and validates authentication tokens for secure access. |
Conduent | What security measures are used for communication across layers? | Communication is secured using JWT tokens to prevent API attacks, with authentication via AD tokens and authorization based on user roles. |
Conduent | How are reports integrated into the web application? | Power BI REST API is used to generate reports asynchronously, which can be embedded in the application or downloaded in PDF/CSV formats. |
Conduent | What information is captured in the audit log of the Revenue System? | The audit log captures events, user actions (e.g., login/logout), reference data changes, and data modifications, stored in audit tables for historical tracking. |
Conduent | How is daily transaction data synchronized from ATP to the Revenue System? | A data integrity check validates terminal records, which are loaded into a table, processed, and pushed to a Kafka stream, with status updates recorded. |
Conduent | How is data from the SPS Mainframe integrated into the Revenue System? | An ETL process extracts, transforms, and loads the last six months of data from the SPS Mainframe into the Revenue System. |
Conduent | What is the purpose of data conversion logic in the application? | Data conversion logic transforms data from external sources to ensure the Revenue System can properly interpret and store it. |
Conduent | What version control system is used for source code management? | GIT is used as a distributed version-control system, with separate repositories for each service to enable granular access control and independent deployment. |
Conduent | How is the application deployed using container technology? | The application is dockerized, with Docker images stored in private container registries and deployed to Oracle Kubernetes Services (OKE) pods. |
Conduent | Describe the Continuous Integration and Continuous Delivery (CI/CD) pipeline used in the project. | Code changes are committed to GIT, triggering Jenkins to compile code, run tests, build Docker images, push them to a container registry, and notify Oracle Kubernetes Services for deployment. |
Conduent | How does the listener service handle JSON messages with varying schemas in the IOT ROS2 Lane App? | The listener service uses a schema identifier in each message to select the appropriate ObjectMapper for converting the message into the correct Java type. |
Conduent | What happens to a JSON message after it is received by the listener service? | The message is converted into a JsonNode using Jackson’s ObjectMapper, then mapped to the target type based on the schema identifier for further processing. |
Conduent | How is error handling implemented in the Kafka consumer for transaction processing? | Error handling includes retries for transient errors, directing failed messages to a dead-letter queue (DLQ) after multiple retries, and storing failed messages for reprocessing. |
Conduent | What is the purpose of the JSON Schema Validator in the IOT ROS2 Lane App? | The JSON Schema Validator ensures incoming JSON messages conform to a predefined schema version, identified by a schemaId, enabling extensibility and adaptability. |
Conduent | Why is Redis used for caching reference data in the obo-ms-plaza-admin microservice? | Redis reduces latency, improves scalability for other microservices, and decreases load on databases by caching fixed or infrequently changing reference data. |
Conduent | How is reference data loaded into the Redis cache? | The obo-ms-plaza-admin microservice uses a RedisTemplate bean and an @EventListener to fetch and cache reference data during application startup. |
Conduent | What are the methods for invalidating and reloading the Redis cache? | Methods include on-demand invalidation via API, time-based expiration with TTL settings, and event-driven invalidation triggered by database updates. |
Conduent | What is required to publish paginated reports to a Power BI workspace? | A Power BI Pro or Premium license, properly configured data sources, and verification that the report renders correctly before publishing to a premium capacity workspace. |
Conduent | How is a Power BI embed token generated for report integration? | An application is registered in Azure AD, authenticated using Client ID, Client Secret, and Tenant ID via OAuth 2.0 Client Credentials flow to retrieve an access token. |
Conduent | How are paginated reports displayed in an Angular application? | Reports can be displayed in a PDF viewer using libraries like ng2-pdf-viewer or pdf.js, or downloaded as PDF/CSV files, with parameters passed to filter data dynamically. |
Conduent | What is the structure of the TRANSACTION_AUDIT table in the IOT ROS2 Lane App? | The table includes columns for TRANSACTION_ID (primary key), SCHEMA_VERSION, RECEIVED_TIMESTAMP, PROCESSING_STATUS, ERROR_MESSAGE, RETRY_COUNT, and LAST_UPDATED_TIMESTAMP. |
Conduent | How does Liquibase facilitate database schema management in the project? | Liquibase automates database changes, maintains version control, supports multiple databases, and allows rollbacks, using changelog files to define changesets. |
Conduent | What is the purpose of the DATABASECHANGELOG table in Liquibase? | The DATABASECHANGELOG table records metadata about applied database changes, maintaining an audit log of Liquibase operations. |
Conduent | How can transaction history be viewed in the OBO application? | Navigate to Plaza -> Toll Zone, select the lane direction and plaza (e.g., 110N and NT03), and click Transaction History at the bottom. |
Conduent | What is the role of the orchestration layer in the Revenue Modernization application? | The orchestration layer, implemented with Node.js, manages microservice interactions, parses data, and handles non-blocking calls to the service layer, integrating with Azure AD and Spring Boot APIs. |
Conduent | How does Spring Data JPA interact with the MySQL database? | Spring Data JPA uses Java Persistence API to create repositories that handle CRUD operations, abstracting database interactions for the MySQL database. |
Conduent | What are Kafka topics, and how are they used in the application? | Kafka topics are logical categories for data streams; they are used to organize and publish transactional data from ATP sources for consumption by the Revenue System. |
Conduent | What is the purpose of partitions in Apache Kafka? | Partitions divide Kafka topics across multiple servers for scalability and fault tolerance, allowing parallel processing of data streams. |
Conduent | How does Spring Batch ensure efficient processing of large datasets? | Spring Batch uses chunk-oriented processing to break datasets into manageable chunks, reducing memory overhead and enabling efficient transaction management. |
Conduent | What is the role of Azure AD in user authorization? | Azure AD validates authentication tokens and checks user roles and permissions to determine access to application modules and screens. |
Conduent | How does the Power BI REST API facilitate report generation? | The Power BI REST API enables programmatic interaction to generate reports in PDF and CSV formats, with URLs constructed based on application triggers. |
Conduent | What is the purpose of the TRANSACTION_DATA table in the IOT ROS2 Lane App? | The TRANSACTION_DATA table stores compressed transaction data as BYTEA, linked to the TRANSACTION_AUDIT table via TRANSACTION_ID for optimized storage. |
Conduent | How does the application handle failed transaction messages? | Failed messages are retried for transient errors, sent to a dead-letter queue (DLQ) after multiple retries, and stored for later reprocessing. |
Conduent | What is the benefit of using Docker for the application? | Docker containerizes the application, ensuring consistent environments, simplified deployment, and scalability within Oracle Kubernetes Services. |
Conduent | How does Jenkins contribute to the CI/CD pipeline? | Jenkins compiles code, runs unit tests, checks code quality, builds Docker images, and pushes them to a container registry upon GIT commits. |
Conduent | What is the purpose of the schemaId in JSON transaction messages? | The schemaId identifies the schema version of a JSON message, guiding the listener service to select the correct ObjectMapper for deserialization. |
Conduent | How is the RedisTemplate configured in the obo-ms-plaza-admin microservice? | RedisTemplate is configured with a RedisConnectionFactory, using StringRedisSerializer for key and value serialization to handle Redis operations. |
Conduent | What is the benefit of time-based cache expiration in Redis? | Time-based expiration with TTL settings automatically removes expired keys, triggering fresh data fetches to maintain cache accuracy. |
Conduent | How does the application ensure scalability in Kafka consumers? | The application uses a load balancer and sets concurrency in @KafkaListener to distribute messages across multiple consumer instances. |
Conduent | What is the role of the Horizontal Pod Autoscaler (HPA) in Kubernetes? | HPA dynamically adjusts the number of application pods based on CPU or memory usage, ensuring scalability and resource efficiency. |
Conduent | How are paginated reports created in Power BI Report Builder? | Paginated reports are created by uploading .rdl files, configuring data sources, and verifying visual rendering before publishing to a workspace. |
Conduent | What is the purpose of the indexes in the TRANSACTION_AUDIT table? | Indexes on TRANSACTION_ID, SCHEMA_VERSION, and PROCESSING_STATUS improve query performance for transaction auditing and retrieval. |
Conduent | How does Liquibase support multi-database environments? | Liquibase abstracts SQL dialect differences, allowing changelog files to define changes compatible with various databases like MySQL and PostgreSQL. |
Conduent | What is the role of the @EventListener annotation in Redis cache loading? | The @EventListener(ApplicationReadyEvent.class) triggers a method to fetch and load reference data into Redis after application startup. |
Conduent | How does the application handle database credentials securely? | Database credentials are stored in Kubernetes Secrets or ConfigMaps, injected as environment variables to avoid hardcoding in the application. |
Conduent | What is the purpose of the GZIP compression in the IOT ROS2 Lane App? | GZIP compression reduces transaction message size by approximately 3:1, optimizing database storage space. |
Conduent | How does the application validate JSON schemas? | The JSON Schema Validator checks incoming messages against predefined schema versions identified by schemaId to ensure data integrity. |
Conduent | What is the role of the dead-letter queue (DLQ) in Kafka? | The DLQ stores failed messages after retry attempts, allowing later reprocessing to ensure reliable transaction handling. |
Conduent | How does Spring Scheduler use CRON expressions? | Spring Scheduler uses CRON expressions to define precise schedules for executing batch tasks, such as daily or monthly report generation. |
Conduent | What is the benefit of using separate GIT repositories for each service? | Separate repositories enable granular access control, smaller codebases, and independent development and deployment of services. |
Conduent | How does the application integrate with Azure Event Hub for transaction simulation? | The obo-eventhub-producer.py script sends simulated transaction messages to the TOPICTXNDASHBOARDQUEUE topic, consumed by the Plaza Dashboard. |
Conduent | What is the purpose of the t_message_header table in the PostgreSQL query for transaction checking? | The t_message_header table stores core transaction metadata, such as message_id, tx_date, and plaza_id, used to retrieve transaction details. |
Conduent | How does the application ensure stateless design in the IOT ROS2 Lane App? | The application avoids storing session data internally, using external services like Redis or databases for session management. |
Conduent | What is the role of the Power BI Report Builder in report creation? | Power BI Report Builder allows users to upload .rdl files, configure data sources, and create paginated reports for publishing to a workspace. |
Conduent | How does the application handle CORS issues in local API testing? | CORS is bypassed by running Chrome with --disable-web-security using the command chrome.exe --user-data-dir='C://Chrome dev session' --disable-web-security. |
Conduent | What is the purpose of the Kubernetes ConfigMaps in the application? | ConfigMaps store environment-specific configurations, such as database URLs, externally, allowing flexible deployment without code changes. |
Conduent | How does the application support parameterized reports in Power BI? | Parameterized reports are supported by passing user-provided parameters via HTTP POST/GET requests to the Power BI report URL for dynamic data filtering. |
Conduent | What is the role of the obo-eventhub-producer.py script in transaction simulation? | The script generates XML transaction messages, logs them to obo-eventhub-producer.log, and sends them to the TOPICTXNDASHBOARDQUEUE topic for dashboard consumption. |
Conduent | How does the application ensure data integrity during ATP synchronization? | A stored procedure performs a data integrity check on terminal records, updating their status before pushing valid records to a Kafka stream. |
Conduent | What is the benefit of using Spring profiles for AET and Express deployments? | Spring profiles allow environment-specific configurations, enabling AET to connect to Oracle and Express to SQL Server without code changes. |
Conduent | How does the application handle database connections for AET and Express environments? | AET uses a shared Oracle URL with different credentials per service, while Express uses unique SQL Server URLs with a common username and password. |
Conduent | What is the purpose of the build.gradle configuration in the build process? | build.gradle dynamically loads libraries based on the profile name (e.g., Dev, AET), ensuring environment-specific dependencies. |
Conduent | How does the application use Lens to manage Kubernetes clusters? | Lens detects Kubernetes contexts from the kubeconfig file, allowing users to explore and manage AKS clusters, view pods, and execute kubectl commands. |
Conduent | What is the role of the DAS_SW_SIM command in transaction simulation? | DAS_SW_SIM runs simulation scripts (e.g., 2_veh_throughput_1000.out) to generate transaction events, displayed on the console and logged for verification. |
Conduent | How does the application handle retry logic for failed messages? | Retry logic includes multiple attempts for transient errors, after which failed messages are sent to a DLQ or stored for manual reprocessing. |
Conduent | What is the benefit of using ng2-pdf-viewer for paginated reports? | ng2-pdf-viewer enables in-app rendering of PDF reports, providing an interactive user experience without requiring downloads. |
Conduent | How does the application ensure efficient database queries for pagination? | Efficient indexing schemes and fetching only required columns minimize data transfer overhead during pagination queries. |
Conduent | What is the purpose of the ReferenceDataService in the Redis cache implementation? | ReferenceDataService exposes an interface for other microservices to fetch reference data directly from the Redis cache. |
Conduent | How does the application manage environment-specific configurations? | Environment-specific configurations are managed using Spring profiles or Kubernetes ConfigMaps, with sensitive data in Secrets. |
Conduent | What is the role of the cloud_la_zc container in transaction simulation? | The cloud_la_zc container runs lane applications to generate transactions, mounted with configuration files from the /runtime directory. |
Conduent | How does the application validate user roles for authorization? | The Revenue System checks user roles and permissions in Azure AD tokens to render authorized modules and screens. |
Conduent | What is the benefit of chunk-oriented processing in Spring Batch? | Chunk-oriented processing reduces memory usage by processing large datasets in smaller, manageable chunks, improving efficiency. |
Conduent | How does the application handle API authentication in local environments? | API authentication in local environments requires adding a Bearer token to the Authorization header in backend.service.ts, refreshed every 5 minutes. |
Conduent | What is the purpose of the t_lane_tx table in the PostgreSQL query? | The t_lane_tx table stores lane-specific transaction details, such as lane_tx_id and actual_class, linked to the t_message_header table for comprehensive transaction data. |
Conduent | How does the application ensure high availability in Kubernetes? | High availability is ensured by deploying multiple pod replicas and using Horizontal Pod Autoscaler to adjust based on resource demand. |
Conduent | What is the role of the plaza-dashboard in transaction simulation? | The plaza-dashboard consumes messages from the TOPICTXNDASHBOARDQUEUE topic, displaying simulated transaction data in tables. |
Conduent | How does the application handle database schema versioning? | Liquibase uses changelog files (e.g., db.changelog-master.xml) to version and apply database schema changes, tracked in the DATABASECHANGELOG table. |
Conduent | What is the benefit of using Storybook for Angular components? | Storybook allows developers to create, test, and document reusable Angular components in isolation, improving development efficiency. |
Conduent | How does the application migrate Angular services to React? | Angular services are refactored to use React hooks, Context API, Redux, or React Query for state management, replacing Angular-specific logic. |
Conduent | What is the purpose of the findTransactions API in the Lane Message Audit? | The findTransactions API retrieves transaction data for auditing, triggered by the Search button in the Lane Message Audit module. |
Conduent | How does the application ensure secure API calls in production? | Secure API calls are ensured using JWT tokens for authentication and role-based authorization, validated by Azure AD. |
Conduent | What is the role of the xlpr server container in transaction simulation? | The xlpr server container generates License Plate Recognition (LPR) information from image data, supporting transaction simulation. |
Conduent | How does the application handle dynamic sorting in server-side pagination? | Dynamic sorting is implemented by allowing clients to specify field names and sort directions in query parameters, processed by Spring Data JPA. |
Conduent | What is the benefit of using Kubernetes Secrets for sensitive data? | Kubernetes Secrets securely store sensitive data like database credentials, preventing exposure in application code or ConfigMaps. |
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