You can assign a label to either data or users. When assigned to data, the label can be attached as a hidden column to tables, providing transparency to SQL.
See Enterprise service bus. Event A notification sent to a more or less well-known set of receivers consumers.
Usually, the receivers of an event have to subscribe for a certain type of event sent by a certain system or component.
Depending on the programming or system model, the systems sending the events the providers might or might not know and agree to send the events to the subscribing receivers. Event-driven architecture EDA A software architecture pattern promoting the production, detection, consumption of, and reaction to events.
Fire and forget Another name for one-way messages a message exchange pattern where a service sends a message without expecting a response. Frontend A system that initiates and controls business processes by calling the necessary services. That is, it acts as a service consumer.
It might be a system with human interaction or a batch program. The fundamental protocol of the World Wide Web. Hub and spoke An abstract software pattern used to transfer data between multiple systems.
In contrast to the bus pattern, it uses a central component that coordinates all communication between senders and receivers.
IDE Integrated development environment. A usually graphical project-oriented environment architecture plan for e-business plan the development of specific software. Idempotency The ability of services to deal with messages that are delivered more than once so that redeliveries do not have unintended effects.
If you want to be sure the message gets delivered and send the message again, the receiver should be able to deal with this second message in such a way that it does not produce an effect different from that of receiving the message only once.
For example, if the message is a request to add money to a bank account, the receiver should add the money only once even if, for reliability reasons, the message was sent twice. Interoperability The ability of different systems to communicate with each other.
Interoperability between different platforms and programming languages is a fundamental goal of SOA Note that standards do not necessarily ensure interoperability. For this reason, in the Web Services world a special organization called WS-I provides profiles to make the standards interoperable.
Because it is only an API standard, it provides portability allowing you to change the middleware while keeping the interfaces but not interoperability allowing you to use different MOM implementations. Loose coupling The concept of reducing the dependencies between systems.
There are different ways to decrease the tightness of coupling between systems, such as having different object models, using asynchronous communicationor using compensation instead of 2PC to maintain consistency. In general, loose coupling leads to more complexity. For this reason, in a specific SOA you have to find the right amount of loose coupling.
Maturity model A model to categorize the maturity of an organization by different levels. Following this approach, many organizations have developed SOA maturity models.
MDSD Model-driven software development. An approach where a significant amount of schematic code, which has the same structure but varies depending on the concrete situation, is generated out of an abstract model.
In the context of SOA and this book it might also stand for model-driven service development. Message A chunk of data sent around as part of a service call.
Message exchange patterns define typical sequences of messages to perform service calls. Message exchange pattern MEP A definition of the sequence of messages in a service call or service operation.
This sequence includes the order, direction, and cardinality of the messages sent around until a specific service operation is done. Message-oriented middleware MOM Middleware that is based on the concept of asynchronous communication. Meta model A description of a model. A meta model refers to the rules that define the structure a model can have.
In other words, a meta model defines the formal structure and elements of a model.Principles are general rules and guidelines, intended to be enduring and seldom amended, that inform and support the way in which an organization sets about fulfilling its mission.
In their turn, principles may be just one element in a structured set of ideas that collectively define and guide the.
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