Also known as

• Distributed Transaction Commander
• Transaction Coordinator

Intent of Commander Design Pattern

The intent of the Commander pattern in Java, especially in the context of distributed transactions, is to manage and coordinate complex transactions across multiple distributed components or services. This pattern ensures data consistency and integrity in distributed systems, making it crucial for microservices architecture. It encapsulates transaction commands and coordination logic, facilitating the implementation of distributed transaction protocols like two-phase commit or Saga.

Also known as

• Event Logging
• Event Streaming

Intent of Event Sourcing Design Pattern

Event Sourcing is a design pattern that advocates for the storage of state changes as a sequence of events. Instead of updating a record in a database, all changes are stored as individual events which, when replayed, can recreate the state of an application at any point in time.

Also known as

• Optimistic Concurrency Control

Intent of Optimistic Offline Lock Design Pattern

The Optimistic Offline Lock pattern in Java is specifically designed to manage concurrent data modifications without the need for long-duration database locks, thus enhancing system performance and scalability.

Intent of Saga Design Pattern

To manage and coordinate distributed transactions across multiple services in a fault-tolerant and reliable manner.

Detailed Explanation of Saga Pattern with Real-World Examples

Real-world example

Imagine a travel agency coordinating a vacation package for a customer. The package includes booking a flight, reserving a hotel room, and renting a car. Each of these bookings is managed by a different service provider. If the flight booking is successful but the hotel is fully booked, the agency needs to cancel the flight and notify the customer. This ensures that the customer does not end up with only a partial vacation package. In the Saga pattern, this scenario is managed by a series of coordinated transactions, with compensating actions (like canceling the flight) to maintain consistency.

Also known as

• Scripted Transactions

Intent of Transaction Script Design Pattern

The Transaction Script pattern in Java organizes business logic by procedures where each procedure handles a single request from the presentation.

Detailed Explanation of Transaction Script Pattern with Real-World Examples

Intent of Unit Of Work Design Pattern

Learn how the Java Unit of Work pattern expertly manages and maintains a list of objects impacted by business transactions, coordinating database changes and solving concurrency issues effectively.

Detailed Explanation of Unit Of Work Pattern with Real-World Examples