By Paul Bakker

In case you are an skilled Java developer within the firm, this sensible, hands-on publication exhibits you the way to exploit OSGi to layout, advance, and install modular cloud functions. you will quick use OSGi, via concise code examples and a suite of top practices derived from the authors' reviews with real-world tasks. during the process this booklet, you are going to discover ways to advance glossy internet functions with instruments and methods akin to RESTful net companies, NoSQL, provisioning, elasticity, automobile Scaling, hotfixes, and automated failover.

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Extra resources for Building Modular Cloud Apps with OSGi: Practical Modularity with Java in the Cloud Age

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There is no way to actually enforce this, and to prevent someone from accidentally using the classes anyway (code completion works against us here). info in different JARs (using Maven, for example) does make the situation a lot better but still relies on naming schemes and doesn’t solve the runtime modularity question. Wouldn’t it be much more convenient to make classes public within a module but hide them from other modules by default? Classes that should be shared with other modules should be “exported” explicitly.

Bundle A contains both private and exported packages. This is common for bundles that export their API and contain a default im‐ plementation as well. Bundle B only exports a package; it doesn’t contain any private packages. This is common for API bundles—bundles that only contain API classes to be implemented by other bundles. Bundle C is the opposite of that: it contains only a private implementation package, maybe implementing the API exported by Bundle B. The bundles can explicitly import packages exported by other bundles.

Such a party could even be a dependency injection framework such as CDI (Context and Dependency Injection), for example. OSGi itself already has a mechanism for this: OSGi Services, or µservices as they are sometimes called. A service provider registers an implementation for a specific interface as a service to the OSGi Service Registry. info using the interface of the required service. The service registry is conceptually the same as the BeanManager in CDI or Spring. Figure 2-2 shows how a service is registered to the service registry.

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