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Problems that would have occurred in the company's internal IT are now shifted to the cloud provider. To prevent "legacy clouds" or solutions that are hard to maintain, it is important to manage the entire architecture proactively and, in particular, the integration into the cloud.

How does your organization still make use of SOA principles?

Even if cloud providers want us to believe otherwise, not every aspect of IT can be outsourced to cloud solutions! Cloud computing is a model for usage-based network access to a common pool of configurable computing resources e. IP-based services are requested via self-service and used online independently. A prerequisite for this is a broadband Internet connection with low latency.

The IT resources are bundled into pools and provided as required. Billing is based on the services used. In deployment models, distinctions are made according to availability and installation location. Public clouds are services that are available to the public on the Internet.

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Private clouds are internal company services. Hybrid clouds and community clouds represent mixtures of these models, such as when Amazon computing power is used in the event of a failure or overload of an internal company cloud application. Large companies for which IT plays a central role or represents a competitive advantage often build internal company cloud solutions in their own data centers. Small and medium enterprises frequently use public cloud services.

A further distinguishing feature is the applications' focus. In the business-to-business segment, private clouds are predominantly used, while the majority of the business-to-consumer segment uses public clouds Figure 2. The key challenges of a cloud computing solution are security and quality aspects, including performance, latency, and availability. Integration, adaptation, agility, and the possible relocation of the solution play a major role during and after the implementation phase Figure 3.

These aspects can be addressed with an SOA-based architecture. Indeed, some experts and analysts believe that SOA is a prerequisite for the cloud. The integration challenge between clouds and how it can be addressed by SOA is one of the key areas. NIST defines the integration between the cloud and on-premise environments as cloud broker services.


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Cloud brokers are categorized in three different types:. The necessity of using SOA in a cloud environment should become apparent in this example of an order-to-cash process.


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In our example, dog food is advertised in Salesforce, purchased via Amazon, and billed in a local finance system. The overall cooperation between sales, logistics, and accounting, and the associated integration of process data plays a key role Figure 4.

Applications Based on Service-Oriented Architecture (SOA) in the Field of Home Healthcare

On the side of the business departments, the following questions may be raised during the process: Which products are of interest to the customer? Which products have they bought in the past, and which products are they considering? Depending on the customer's credit line, is the delivery prepaid or invoiced?

What is the availability and shipment status of the products? Linking the different cloud systems with the local IT systems is necessary to answer these questions, which have a direct influence on the process. A common metric and definition is required in order to compare the data.

It is best practice to establish a master data management MDM program that lays the foundation to common access to core entities of the enterprise such as customer, contract, or product. This principle of MDM also applies to cloud-based processes. In our example MDM defines a customer in all systems and therefore the customer can be identified.

Cover Pages: Service Oriented Architecture (SOA)

This integration takes place on multiple levels:. At the data level, we differentiate between the concept of data integration at regular intervals and data integration in realtime. Point-to-point integration and data cleansing at regular intervals could include, for instance, the daily data transfer of sales data from the Amazon shop to the Salesforce CRM system.

By contrast, data integration for transferring sales data to the accounting system for invoicing is performed in realtime. Effective business processes are changed directly by business departments on an ad hoc basis according to their rights and roles in order to satisfy changed requirements. In our example, the marketing department decides to sell products on both Amazon and on eBay, motivated by the free-of-charge delivery. For process integration, this means the incorporation of a further SaaS solution into the process flow, based on common data objects.

We can therefore use SOA concepts like enterprise business objects, which contain data such as customer definitions, and the enterprise business services, such as the update to a customer file. The various cloud solutions often define these business objects and services differently, which is why a common meta-model that integrates the process is required.

https://flexantosa.cf The following are required for the object model:. All objects should be held in a common repository and data dictionary. A model designer can be used to amend the objects. In the future for complex objects, a model matcher based on conventions, catalogs, dynamic typologies, and search agents might be used semantic SOA. Decision rules that can be abstracted in a rules engine can therefore be changed by business users at any time.

This is a fundamental aspect for process agility. This threshold can be changed by the business users at any time, for example if the total amount of open invoices is very low or high. Rules engines and task management solutions are used in particular for SaaS cloud applications that are not individually programmed. However, the various cloud applications use different rules engines, so a common standard and an overall meta-model for defining objects and rules could resolve this in the future.

The following characteristics and principles can be found in the literature:. From Wikipedia, the free encyclopedia. A service has four properties according to one of many definitions of SOA: [2] It logically represents a business activity with a specified outcome. It is self-contained. It is a black box for its consumers. It may consist of other underlying services. Main article: Event-driven architecture.

Main article: Microservices. Archived from the original on February 6, Retrieved September 21, Archived from the original on August 19, Cloud Computing: A Practical Approach. McGraw Hill. December 9, Archived from the original on December 9, About the Principles.

Enterprise Service Oriented Architectures Concepts, Challenges, Recommendations The Enterprise Serie

January 5, Retrieved August 13, Retrieved September 3, Niki Maleki; Negin Daneshpour SCC IEEE Software. SOA Patterns. Manning Publications. Julisch et al. Volume 30, Issue , Sep. Retrieved September 10, Computer User. Page XML Journal. Microservices Journal. June 19, Retrieved June 27, June 27, Retrieved September 22, Tim O'Reilly.

September 30, Retrieved June 10, IT Professional 9 , Nr.