Preface in Java

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Preface
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Having explored the SCA programming model in depth, s 5 9 cover the main SCA concepts: composition, policy, wires, bindings, and the domain In these chapters, we explain how to develop modular applications, use transactions, con gure crossapplication policies such as security and reliability, integrate with external systems, deploy applications, and structure corporate architectures using SCA 10, Service-Based Development Using BPEL, demonstrates how to use BPEL with SCA to provide applications with long-running process capabilities The nal two chapters round out application development with SCA by focusing on the data and presentation tiers 11, Persistence, details how to use Java Persistence API (JPA) with SCA to read and write data from a database 12, The Presentation Tier, demonstrates how to integrate web applications, in particular servlets and JSPs, with SCA services
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Introducing SCA
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Service Component Architecture, or SCA, is a technology for creating services and assembling them into composite applications SCA addresses the perennial question of how to build systems from a series of interconnected parts In SCA, these parts interact by providing services that perform a speci c function Services may be implemented using different technologies and programming languages For example, a service can be implemented in Java, C++, or in a specialized language such as Business Process Execution Language (BPEL) Services may also be collocated in the same operating system process or distributed across multiple processes running on different machines SCA provides a framework for building these services, describing how they communicate and tying them together We once heard a witty de nition of a technology framework that is appropriate to bring up in this context: A technology framework is something everyone wants to write but no one wants to use Indeed, the industry is replete with frameworks and programming models promising to solve problems posed by application development in new and innovative ways In the 1990s, the Distributed Computing Environment (DCE) was superceded by Common Object Request Broker Architecture (CORBA) and Distributed Component Object Model (DCOM) Java Enterprise Edition (Java EE) and NET emerged as the two dominant frameworks in the early
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Introducing SCA
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2000s, supplanting the latter two Open source has also been a center of innovation, with Spring and Ruby on Rails emerging as two of the more popular frameworks This raises the question of why SCA What problems with existing programming models is SCA trying to solve The sheer scope of SCA as a technology and the fact that it is supported by a diverse set of vendors invariably has led to a degree of confusion in this respect SCA can be initially daunting to understand
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SCA addresses two key issues with existing approaches: complexity and reuse
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SCA addresses two key issues with existing approaches: complexity and reuse First, SCA provides a simpli ed programming model for building distributed systems The dominant programming models today have grown increasingly complex For example, writing a Java EE application that exposes web services, performs some processing, and interfaces with a messaging system to integrate with other applications requires knowledge of the JAX-WS, JMS, and EJB APIs This complexity has not been limited to Java EE: The NET framework has been subject to the same trend Writing an identical application using NET 20 requires an understanding of the ASP NET Web Services, Enterprise Services, and NET Messaging APIs In contrast, as illustrated in Figure 11, SCA provides a uni ed way to build applications that communicate using a variety of protocols
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Applications
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Services
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APIs
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Service Component Architecture
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Web Services Remote Binary Messaging Other Bindings
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Protocols
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SCA provides a uni ed way to build distributed applications
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Introducing SCA
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Perspective: SCA and NET
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In recent years, increasing complexity has not been limited to Java EE: The NET framework has been subject to the same trend Writing an identical application using NET 20 requires an understanding of ASP NET Web Services, Enterprise Services, and NET Messaging APIs Microsoft has spent signi cant time addressing complexity in the NET Framework Starting with version 30, NET incorporates a programming model that uni es web services, remote procedure calling, queued messaging, and transactions SCA introduces a uniform way to perform distributed interactions In SCA and Windows Communication Foundation (WCF), application logic is invoked the same way whether web services, a binary, or a messaging protocol is used (see Figure 12)
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