One of the topics we will be covering at our annual event, which will be held on September 21 in Panama City, is event sourcing, a software architecture that many people are unfamiliar with but that has numerous benefits when implemented in a software product.
Event sourcing, also known as data supply in Spanish, is an architectural style that saves an application's state as a sequence of events. Instead of keeping an object's current state, event sourcing records any changes or events that have occurred over time.
The program can reconstitute the present state of the object at any time by replaying these events. This pattern provides a trustworthy and auditable record of how the application's state has changed over time.
Real-time data processing and event sourcing are two principles that can be used to create robust and scalable systems. You must first understand real-time data processing and how it relates to event sources.
The ability to evaluate and act on data as it is generated, offering immediate insights and reactions, is referred to as real-time data processing. It entails analyzing and responding to data in near real time or with little delay. This is especially critical in cases where judgments or actions must be taken quickly based on incoming data streams.
Let's have a look at how real-time data processing can be integrated with event sourcing:
You may develop systems that not only provide immediate insight and action, but also keep a reliable history of how the system's state has evolved over time by combining real-time data processing with event sourcing. This can be useful in fields such as banking, logistics, IoT, and many others where auditing, traceability, and historical analysis are required.
The usual method in a financial application, for example, is to have a database; when a transaction is to be made, the program connects to the database, reads the account statement, and applies the changes as income or withdrawals.
With event sourcing, this process is not handled with the current state, but everything is derived in events. For example, instead of going to the database and modifying the account, the system issues an event with the details of this transaction, and the systems "interested" in this event will react and process the transaction.
Each transaction is classified as an event, and the program will explore each event to, for example, see the history of an account. It may appear to be extra effort, but the firm or client will have a history of everything that occurred as a security mechanism in case the database fails.