Distributed Software and System Architectures

Lecture 2

1. Distributed Architectures

• Software Architecture
• Logical organization of the collection of software components that make up a distributed application
• System Architecture
• Instantiation of a software architecture, i.e., physical placement of software components on computers

2. Architecture Style

• Layered architectures
• Pros
• Division of task
• Scalability
• Transparency
• Potability
• Cons
• e.g., layer 1 and layer 3 cannot talk directly

• Object-based architectures
• Pros
• Independent components
• Free to talk to anyone

• Data-centered architectures
• e.g., google docs

• Event-based architectures
• e.g., facebook

3. System Architecture

• Centralized architecture
• client-server applications
• Decentralized architecture
• Peer-to-peer applications
• Hybrid architecture