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Chapter 11: Problem 7

Giving reasons for your answer, suggest an appropriate control model for the following systems: A batch processing system that takes information about hours worked and pay rates and prints salary slips and bank credit transfer information A set of software tools that are produced by different vendors, but which must work together A television controller that responds to signals from a remote control unit.

Short Answer

Expert verified
Use a batch control model for the batch processing system, middleware-based control for software tools integration, and an event-driven model for a television controller.

Step by step solution

01

Identify System Characteristics - Batch Processing System

The batch processing system processes data in groups or batches, focusing on calculating payroll after collecting all relevant information such as hours worked and pay rates. This system typically does not require real-time processing and can handle large amounts of data at periodic intervals.
02

Suggest Control Model - Batch Processing System

Given its characteristics, a batch processing system can be effectively managed using a batch control model. This model suits periodic work processing where operations are scheduled and executed without the need for user interaction during the process.
03

Identify System Characteristics - Software Tools Integration

A set of software tools from different vendors need to work together seamlessly. This typically requires ensuring compatibility, data exchange standards, and interface requirements, thereby focusing on interoperability and coordination among systems.
04

Suggest Control Model - Software Tools Integration

An appropriate control model for integrating software tools from different vendors would be a middleware-based control model. Middleware acts as an intermediary layer that facilitates communication, data management, and service requests between various software components.
05

Identify System Characteristics - Television Controller

The television controller needs to respond in real time to user inputs from a remote control. This requires immediate processing upon receiving signals to change channels, adjust volume, or navigate menus.
06

Suggest Control Model - Television Controller

For a television controller, an event-driven control model is suitable. This model focuses on processing inputs or events (like button presses) immediately as they occur, ensuring responsive interaction with the user.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Batch Processing System
A batch processing system efficiently handles large sets of data by processing it in groups or batches. This approach is ideal for tasks such as payroll calculations, where the system gathers data like hours worked and pay rates before running computations. Batch processing does not require immediate real-time feedback, making it suitable for periodic data handling.

Key attributes of batch processing systems include:
  • Scheduled processing times, often optimizing system resources.
  • No real-time interaction is needed; outputs are generated after processing.
  • Can process large volumes of data, minimizing manual intervention.
Software Tools Integration
Integrating software tools from different vendors involves creating a seamless operational environment. This typically requires focusing on interoperability and the ability to communicate effectively across various platforms. Such integration is essential for ensuring tools can share data and understand each other's processes.

This task can be challenging due to:
  • Diverse data formats and protocols.
  • Compatibility issues between different systems.
  • Consistency and reliability requirements.
Using a middleware-based control model can simplify integration by offering an abstraction layer. This middleware layer facilitates data exchange and process coordination, ensuring different tools work together smoothly.
Middleware-Based Control Model
Middleware provides a crucial layer for connecting disparate software components, especially in a diverse ecosystem. It acts as an intermediary that handles communication, data management, and ensures service requests between applications are followed properly.

Benefits of middleware in control models:
  • Simplifies complex integrations by abstracting the underlying system complexities.
  • Allows rapid deployment of new components without disrupting existing services.
  • Enhances scalability by enabling efficient resource sharing across systems.
Middleware solutions enable smooth interactions among a variety of software tools, maintaining consistency and enhancing productivity.
Event-Driven Control Model
In an event-driven control model, the system responds to inputs or events as they occur. It's perfect for situations requiring immediate user interaction, such as a television controller responding to remote control signals.

Main features of event-driven models include:
  • Quick response to user inputs or system changes.
  • Asynchronous processing, which means tasks are not executed sequentially.
  • Flexibility to handle numerous types of events, from simple clicks to complex actions.
This model is widely used in interactive environments to maintain a smooth and responsive user experience.
Real-Time Processing
Real-time processing is essential when systems must provide quick responses to inputs, ensuring tasks are completed within a set timeframe. It is critical in contexts like monitoring or controlling systems where delayed reactions are unacceptable.

Characteristics of real-time systems include:
  • Immediate data processing upon receiving new information.
  • Deterministic behavior, guaranteeing predictable response times.
  • Often used in mission-critical environments where timing is crucial.
Real-time processing ensures timely and efficient operations, especially in applications demanding fast decision-making.

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Most popular questions from this chapter

Should there be a separate profession of 'software architect' whose role is to work independently with a customer to design a software system architecture? This system would then be implemented by some software company. What might be the difficulties of establishing such a profession?

Discuss their advantages and disadvantages as far as distributability is concerned of the data-flow model and the object model. Assume that both single machine and distributed versions of an application are required.

Explain why design conflicts might arise when designing an architecture where availability and security requirements are the most important functional requirements.

Real-time systems usually use event-driven models of control. Under what circumstances would you recommend the use of a call-return control model for a real-time system?

Explain why it may be necessary to design the system architecture before the specifications are written.
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