The Domain in Java

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A Java EE cluster and deployment architecture
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Enterprise repositories store and manage artifacts and make them available to multiple clients
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With the move to service-based applications, requirements for artifact sharing have evolved beyond the Java EE distribution model Services are built around contracts, which often reference additional artifacts such as WSDL documents and XML schemas These artifacts must be shared between clients and service providers that are potentially hosted on different machines One solution to this problem is an enterprise repository Enterprise repositories store and manage artifacts and make them available to multiple clients Figure 93 provides a sketch of how this works Depending on the vendor, an enterprise repository might include features such as work ow and versioning
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The Role of a Domain
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Figure 93 Repositories store artifacts such as WSDLs and XSDs, which can be accessed by clients
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Enterprise Repositories and Registries
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An enterprise repository is responsible for managing application artifacts such as WSDL documents, XML schemas, and sometimes code It is also common to use the term enterprise registry to refer to software that performs the same function Unfortunately, the industry hasn t settled on the distinction between the two terms To avoid confusion, we chose to stick with one term: enterprise repository
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The domain lls the role of an enterprise repository and deployment infrastructure: It stores and manages artifacts, as well as distributes them to runtimes To accomplish this task, the domain uses some form of repository Let s see how this works As we covered in the rst chapter, artifacts are made available to the domain as contributions Depending on the SCA implementation, contributions are installed in the domain using a commandline deployment tool or via more sophisticated graphical tooling, such as an IDE or management console Figure 94 illustrates this process
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The domain lls the role of an enterprise repository and deployment infrastructure: It stores and manages artifacts, as well as distributes them to runtimes
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The Domain
SCA Domain
SCA Runtimes
Artifacts are contributed to a domain Artifacts are provisioned to runtimes
Contribution Repository
Figure 94 The domain stores contributions in a repository where they can be accessed
When a contribution is installed, it is stored in a repository As we see later, when the contribution has been installed, it can be referenced by other contributions This enables a contribution to use artifacts in another installed contribution After a contribution is installed, composites contained in it may be deployed As part of this process, the domain may distribute artifacts required by components to runtime nodes where those components are hosted Policy Administration Most enterprise architectures use some form of policy In 6, Policy, we explained that policy is a requirement placed on how a runtime must execute code Common types of policy include security ( use encryption for remote invocations ), reliability ( provide guaranteed delivery of messages to a particular service ), and transactionality ( invoke this service in a transaction ) Both Java EE and web services provide mechanisms for declarative or con guration-based policy Java EE allows transactional and security behavior to be declared in EJB con guration Web services has WS-Policy and an assortment of speci cations for security and reliability based on it However, what Java EE and web services lack is a standard way to specify policy once and reuse it across applications for example, requiring that all remotable services use a certain type of message-level encryption
The Role of a Domain
The domain is designed to address the problem of policy reuse by providing a way to uniformly apply policy across all deployed composites The domain does this by treating policies as contributions that are installed and activated When a policy con guration is installed as a contribution, it can be applied to services in the domain (see Figure 95)
SCA Domain
Policies are app
The domain is designed to address the problem of policy reuse by providing a way to uniformly apply policy across all deployed composites The domain does this by treating policies as contributions that are installed and activated
lied
Policy Definitions
Contribution Repository
Figure 95 runtimes
Policies are contributed to the domain and applied across
The domain allows policy con gurations to be selectively applied to services, references, bindings, and component implementations It s the job of the domain to ensure that these policies are applied wherever they are required Communications Establishing remote communications is fundamental to the domain Because we have already spent substantial time on how a domain instantiates wires and implements bindings in previous chapters, we will not spend much time on the role of the domain as a remote communications infrastructure