Download Building Modular Cloud Apps with OSGi: Practical Modularity by Paul Bakker PDF

By Paul Bakker

In case you are an skilled Java developer within the firm, this functional, hands-on booklet exhibits you ways to exploit OSGi to layout, strengthen, and installation modular cloud purposes. you will quick how one can use OSGi, via concise code examples and a collection of most sensible practices derived from the authors' studies with real-world tasks. throughout the process this e-book, you are going to discover ways to strengthen sleek net purposes with instruments and methods comparable to RESTful internet providers, NoSQL, provisioning, elasticity, automobile Scaling, hotfixes, and automated failover.

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

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Changes will only be picked up after you save the configuration. Now start the framework by clicking the green Run OSGi button. In the Eclipse console, you will now see the OSGi shell. You can view the list of installed bundles by typing lb in the console window. The bundle state should be ACTIVE for all bundles. This means the bundles are started and all required imports are resolved. service bundle would remain in INSTALLED state (you can try this without even restarting the framework). INSTALLED means that the bundle has not or could not be started because some imported packages could not be resolved.

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. Figure 2-1. Bundles explicitly importing and exporting classes With a bundle mechanism like this, we can now hide implementations from other bun‐ dles.

Now start the framework by clicking the green Run OSGi button. In the Eclipse console, you will now see the OSGi shell. You can view the list of installed bundles by typing lb in the console window. The bundle state should be ACTIVE for all bundles. This means the bundles are started and all required imports are resolved. service bundle would remain in INSTALLED state (you can try this without even restarting the framework). INSTALLED means that the bundle has not or could not be started because some imported packages could not be resolved.

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