Application frontend in Java Printing PDF-417 2d barcode in Java Application frontend

Application frontend using j2se toincoporate barcode pdf417 on web,windows application GS1 General Specifications Service Service repository Service bus Contract Implementation Interface Business logic Data Download at WoweBook.Com SOA and Its Evolution A service in SOA i javabean pdf417 s basically an encapsulation of data and business logic. A service consists of an interface, has an implementation, and exhibits certain pre-defined behavior. The service interface defines a set of operations, which portrays its capabilities; operations are the things that a service can do.

The provider of the service offers one or more contracts based on the interface and behavior details, and is responsible for creating a service implementation capable of fulfilling such contract(s). The consumer of the service is only concerned with the contract for use of this service. The service functionalities may be derived from diverse sources, for example, databases, legacy applications, packaged enterprise applications, or bespoke applications developed in traditional programming environments like C/C++, Java, or .

Net. Mature technologies and tools exist today that can easily package and expose these functionalities as services. A wide variety of service consumers are possible, for example, composite applications, user interaction modules, or business-to-business gateways.

Service and IT infrastructures bridge service consumers and the providers and provide mechanisms to apply adequate security and other policies (see the following figure for a high-level SOA Reference Architecture schematic, ref. Oracle SOA Methodology)..

Browsers Client UI Cell PDA IVR System Consumers Client Apps Partner Apps Event Proc Service Consumers User Interaction Channels Composite Applications Web Apps Portals Mashups Workflow Business Processes Fat Clients Presentation Servi barcode pdf417 for Java ces Business Process Services Business Activity Services Data Services Connectivity Services. Consistent User In teraction Shared Business Processes Atomic Business Services Logical Data Model System Access. Shared Portlets Service Mediation & Messaging Shared Services Business Process Rationalization Process Integration System & Human Centric Processes Custom Business Logic Data Access Partner Integration IT Infrastructure for SOA SOA Management SOA Governance SOA Security Data Aggregation Data Synchronization Messaging Adapters Data Access Service Infrastructure Non-Service Enabled Assets Service Enabled Assets Existing IT Assets Legacy Packaged Databases Partners Content Collaboration Search [ 10 ]. Download at WoweBook.Com 1 . It is worthwhile t o point out that the concept of service packaging is quite general. A service can utilize other services along with suitable composition mechanism, for example, using declarative orchestration or some procedural code. Services are often classified, that is, type designations are assigned to services, in order to be able to specify best practices for their implementation and management.

There are many strategies for service classification. One classification approach relies on what the service encapsulates, and accordingly we have (adapted from: SOA Principles of Service Design by Thomas Erl, Prentice Hall): Entity services: These services package corporate/business entities such as customer, account, employee, contract, and so on, and provide access to underlying data elements via the basic data access operations like create, read, update, and delete, collectively called the CRUD operations, plus a few others and some logic calculations based on the attributes of the entity. Entity services are generally business process agnostic, for example, data services providing access to data in packaged applications.

Task services: These services perform a portion or all of some business process or activity and in turn may access functionalities of various entity or other task services. A payment update action involving updates to several entities such as customer and account is an example of a task service. Task services often represent sub-processes of higher-level business processes.

Utility services: These are helper services to entity and task services providing connectivity to applications (for example, connector services), access to security infrastructure (for example, directory services), or other generic utilitarian activities like logging.. Utility services a applet PDF 417 re typically technical or infrastructural in nature while entity and task services usually carry business semantics. Utility and entity services are, generally speaking, more reusable than task services..

As a general rule, when scoping capabilities of services, do not mix business process/application specific and agnostic functionalities doing so is likely to hinder re-use and composability of services.. [ 11 ]. Download at WoweBook.Com SOA and Its Evolution The key business e xpectations for service orientation (and SOA), in fact the main reasons why this paradigm has been gaining such increased attention in recent years, can be summarized as: Cost reduction for IT application development via service reuse, and for IT operations via well-defined services-based operations layers Increased business agility, that is, reduction in time-to-market of a company"s offering by speeding up creation of new or modification of existing IT applications and business processes by composing and assembling applications from existing assets as opposed to building from scratch Change resilience, that is, ability of higher-level applications and processes to remain insulated from changes in lower or backend applications, for example, a customer order management process not being affected by the introduction of a new order fulfillment system Continuous improvement of operations via improvements in performance of services and Service Level Agreements (SLAs) without disrupting business operations Better communication between business and IT using business-oriented service specifications thus reducing the so-called business-IT gap. In order to achiev jboss PDF-417 2d barcode e the above business benefits, SOA implementations and services therein must follow certain essential disciplines: Loose coupling: Consumers refer to service contracts in order to use services and not their implementations thus reducing the level of dependency between consumers and providers. Discoverability: Services should be self described and be published into services registries and repositories so as to facilitate design-time searches and runtime look-ups. Location transparency: This refers to the ability of a service consumer to be able to invoke a service regardless of its actual location in the network; this also assumes the discoverability property (described above) and that the consumer has the right to access the service.

Often, the idea of service virtualization, where the consumer simply calls a logical service while a suitable SOA-enabling runtime infrastructure component, commonly a service bus, maps this logical service call to a physical service, also relates to location transparency.. [ 12 ].
Copyright © . All rights reserved.