L06c - Enterprise Java Beans

Single CPU operating systems initially focused on technical issues in single-processor environments, which then expanded to support parallel processing and eventually evolved into systems operating over multiple interconnected machines as distributed systems emerged.

Object technology aids in structuring operating systems through core concepts like inheritance and reuse, as well as multi-level structuring applicable at various levels of system architecture.

Enterprise JavaBeans (EJB) are reusable software components that consist of multiple Java objects bundled together, designed to facilitate easy passing and reuse of these components across different applications.

<p>Users perceive enterprises as single, unified entities with straightforward interactions, whereas the internal complexity involves numerous interconnected services, systems, and departments working together.</p> Signup and view all the answers

<p>Mergers and acquisitions create amalgamated entities that combine multiple systems and processes, resulting in increased complexity in both internal and external operations.</p> Signup and view all the answers

<p>Inter-enterprise interactions present challenges such as service integration, where multiple companies collaborate to fulfill service requests, complicating overall operations.</p> Signup and view all the answers

<p>Understanding supply chain models is significant as they illustrate how enterprises collaborate and coordinate to fulfill service requests, involving multiple entities working together.</p> Signup and view all the answers

<p>The complexity of internal operations involves intricate dependencies and numerous divisions, whereas users experience a simplified and unified interaction from their personal devices.</p> Signup and view all the answers

<p>Ensuring different systems can work together smoothly without compatibility issues.</p> Signup and view all the answers

<p>Scalability allows systems to handle growing amounts of work and to expand as needed.</p> Signup and view all the answers

<p>Object technology promotes reuse and modularity, aiding in the scalability and maintainability of systems.</p> Signup and view all the answers

<p>Atomicity ensures that transactions are fully completed or not at all, preventing inconsistencies.</p> Signup and view all the answers

<p>It is vital for aligning different systems' interfaces to enable smooth operation post-merger.</p> Signup and view all the answers

<p>Users competing for the same physical resources, like flight seats, can lead to conflicts in availability.</p> Signup and view all the answers

<p>Enterprises must adapt their systems to keep up with technological changes and market demands.</p> Signup and view all the answers

<p>It illuminates the differences between how enterprises are perceived externally and how they function internally.</p> Signup and view all the answers

<p>They streamline development and maintenance by reducing redundancy and improving consistency.</p> Signup and view all the answers

<p>They can cause data inconsistencies and require effective synchronization to manage simultaneous user interactions.</p> Signup and view all the answers

<p>Modularity facilitates easier updates and improvements by allowing components to be modified independently.</p> Signup and view all the answers

<p>Giant scale services operate on an internet-wide scale, serving millions, while organizational services are limited within a single organization.</p> Signup and view all the answers

<p>Reliability ensures consistent performance and uptime, which is essential for maintaining user trust.</p> Signup and view all the answers

<p>Object technology facilitates the reuse of components, which enhances development efficiency and scalability.</p> Signup and view all the answers

<p>Concurrency and resource management are critical challenges in managing giant scale services.</p> Signup and view all the answers

<p>N-Tier applications are structured with multiple layers, each responsible for specific functionalities to enhance scalability and modularity.</p> Signup and view all the answers

<p>The Application Logic Layer processes user requests and implements business rules, acting as a bridge between the user interface and business logic.</p> Signup and view all the answers

<p>ACID stands for Atomicity, Consistency, Isolation, and Durability, and it ensures that transactions are processed reliably.</p> Signup and view all the answers

<p>Caching temporarily stores frequently accessed data, reducing database load and improving data access speed.</p> Signup and view all the answers

<p>The main objectives are to reduce network communication, lower security risks, and increase concurrency.</p> Signup and view all the answers

<p>Service clustering groups related services to improve performance and availability, allowing better load handling and fault tolerance.</p> Signup and view all the answers

<p>Security protects sensitive information, ensuring data confidentiality and user trust, which are vital for maintaining business integrity.</p> Signup and view all the answers

<p>Parallelism reduces response time by allowing multiple tasks to be processed concurrently without interdependencies.</p> Signup and view all the answers

<p>Embarrassingly parallel applications consist of tasks that can be executed simultaneously with little to no dependency on one another.</p> Signup and view all the answers

<p>The Database Layer manages data storage and retrieval, providing necessary information to the application and business logic layers.</p> Signup and view all the answers

<p>Persistence maintains state and data over time, allowing users to resume interrupted transactions.</p> Signup and view all the answers

<p>Load balancers distribute requests evenly across servers, enhancing performance and preventing any single server from becoming overwhelmed.</p> Signup and view all the answers

<p>Clustering computations groups similar tasks to optimize processing, which enhances performance and reduces redundant calculations.</p> Signup and view all the answers

<p>Code libraries and services are two types of reusable components.</p> Signup and view all the answers

<p>EJB containers manage Enterprise JavaBeans, providing transaction management, security, and concurrency control.</p> Signup and view all the answers

<p>Stateful session beans maintain a conversational state with a client, while stateless session beans do not retain any state between method calls.</p> Signup and view all the answers

<p>Modular design promotes interchangeable parts, making it easier to reuse components across different applications.</p> Signup and view all the answers

<p>Fine-grained beans encapsulate small functionalities, allowing for enhanced concurrency and easier maintenance and testing.</p> Signup and view all the answers

<p>Web containers manage servlets and JSPs, handling HTTP requests and generating dynamic web pages for clients.</p> Signup and view all the answers

<p>Bean-Managed Persistence (BMP) and Container-Managed Persistence (CMP) are the two types of persistence management.</p> Signup and view all the answers

<p>The goal is to reduce latency and security risks while increasing concurrency and performance.</p> Signup and view all the answers

<p>Message-driven beans handle asynchronous messages, acting as listeners for messaging systems.</p> Signup and view all the answers

<p>Implementing thread pools to manage concurrent execution is one strategy to optimize shared resources.</p> Signup and view all the answers

<p>Component reuse increases efficiency by reducing development time and ensuring consistency across the application.</p> Signup and view all the answers

<p>The client container manages client-side application components and handles user interface interactions.</p> Signup and view all the answers

<p>A coarse-grain session bean design secures business logic within the corporate network, preventing exposure to external threats.</p> Signup and view all the answers

<p>Using RMI can introduce network latency and overhead due to additional communication required between the session facade and entity beans.</p> Signup and view all the answers

<p>Local interfaces help improve performance by allowing co-location of components and reducing network communication overhead.</p> Signup and view all the answers

<p>Entity beans allow for parallel data access, enabling session facades to issue multiple requests simultaneously.</p> Signup and view all the answers

<p>The third design alternative uses a session facade to maintain business logic security while allowing enhanced concurrency through entity beans.</p> Signup and view all the answers

<p>Moving business logic to the web container exposes it to external access, thereby increasing security risks.</p> Signup and view all the answers

<p>Two key cross-cutting concerns are security and persistence.</p> Signup and view all the answers

<p>Object technology promotes component reuse which enhances maintainability and scalability of complex applications.</p> Signup and view all the answers

<p>The session facade acts as a protective barrier that encapsulates business logic and facilitates communication between client and EJB components.</p> Signup and view all the answers

<p>The EJB container manages critical concerns such as security and persistence, allowing developers to concentrate on business logic.</p> Signup and view all the answers

<p>To mitigate the lack of parallelism in database access present in the first design alternative.</p> Signup and view all the answers

<p>Entity beans allow multiple database rows to be accessed simultaneously, enabling parallel data retrieval.</p> Signup and view all the answers

<p>BMP requires persistence logic to be implemented within the entity bean, while CMP allows the EJB container to handle persistence automatically.</p> Signup and view all the answers

<p>Moving business logic can enhance concurrency and utilize resources more efficiently by amortizing database access.</p> Signup and view all the answers

<p>Developers must balance improved performance through parallel data access with the security vulnerabilities introduced by exposing business logic.</p> Signup and view all the answers

<p>It associates a session bean with each client session, keeping business logic within the EJB container.</p> Signup and view all the answers

<p>Servlets handle client sessions and presentation logic, acting as the interface for client requests.</p> Signup and view all the answers

<p>Granularity affects concurrency by determining how many database rows each entity bean represents, which can be fine- or coarse-grained.</p> Signup and view all the answers

<p>Increased complexity can lead to issues such as race conditions or data inconsistencies.</p> Signup and view all the answers

<p>It enables shared access to similar data requests, allowing clustering of requests to optimize database access.</p> Signup and view all the answers

<p>The local interface is preferred as it co-locates entity beans with the session facade in the same EJB container.</p> Signup and view all the answers

<p>CMP simplifies development by allowing the EJB container to manage persistence automatically.</p> Signup and view all the answers

<p>It amortizes database access across multiple clients, reducing latency and improving response times.</p> Signup and view all the answers

<p>It exposes the business logic to external networks, increasing potential vulnerabilities.</p> Signup and view all the answers

<p>Fine-grained beans increase complexity due to the management of many small components.</p> Signup and view all the answers

<p>It retains concurrency benefits while securing business logic by housing it within the EJB container.</p> Signup and view all the answers

<p>Coarse-grained beans encapsulate a larger set of functionalities, reducing the number of components to coordinate.</p> Signup and view all the answers

<p>Fine-grained beans offer higher concurrency but increase complexity, while coarse-grained beans simplify logic but limit concurrency.</p> Signup and view all the answers

<p>Bean granularity refers to the level of detail in which beans encapsulate functionalities within an application.</p> Signup and view all the answers

<p>Coarse-grained beans may perform better in environments where overhead is a concern.</p> Signup and view all the answers

<p>A key consideration is to balance concurrency needs with the complexity of business logic.</p> Signup and view all the answers

<p>Component reuse maximizes the utilization of existing beans, accelerating development and enhancing consistency.</p> Signup and view all the answers

<p>The Web Container contains the presentation logic and serves as the interface between the client and the server.</p> Signup and view all the answers

<p>Business logic should be confined within the corporate network inside the EJB container to enhance security.</p> Signup and view all the answers

<p>Session beans retrieve flight details for bookings and manage data access required by the business logic.</p> Signup and view all the answers

<p>Coarse-grained session beans limit concurrency, resembling a monolithic kernel that cannot fully exploit parallel processing.</p> Signup and view all the answers

<p>EJB container services primarily coordinate conflicts from concurrent data access between multiple session beans.</p> Signup and view all the answers

<p>Using coarse-grained session beans can compromise the ability to efficiently handle concurrent operations.</p> Signup and view all the answers

<p>Developers must consider application requirements, performance goals, and maintainability.</p> Signup and view all the answers