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Pro+Spring+Dynamic+Modules+for+OSGi+Service+Platforms
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上传时间: 2011-05-05
详细说明： This book is about OSGi’s role in enterprise Java and how the Spring Dynamic Modules for OSGi (Spring-DM) fulfills this role. I first learned about OSGi when the Eclipse IDE started using it in its plug-in architecture. At the time, the versioning and modularity features seemed nicer “for an IDE” than what was available using stand-alone Java. However, OSGi still seemed something reserved to the internal workings of an IDE. Next, I read about Java SE initiatives to incorporate similar modularity features, with OSGi being a leadi ng contender. Competing in this space were JSR-277, “Java Module System,” and JSR-291, “Dynamic Component Support for Java,” the latter based on OSGi principles. Knowing that OSGi might very well influence the Java language itself—via Java SE— raised my interest in OSGi and how it could be applied to scenarios in the enterprise Java space. It didn’t take much research to find out that some Java EE application server vendors had relied on those same OSGi features to design their products. But in much the same way as the Eclipse IDE, OSGi still seemed reserved to the internal workings of a product. So I was still left with a big question: could OSGi influence enterprise Java applications in some other way? When I discovered Spring-DM, the answer became clear: yes. OSGi along with Spring-DM will make you rethink the way you design Java applications. Support for runtime versioning is probably one of the biggest changes you will appreciate. Running multiple versions of the same class in a JVM instance is a difficult task in standalone Java, requiring the use of custom class loaders. With OSGi this is not the case. No longer will you need to check your CLASSPATH variable to avoid running multiple JARs with the same name that may contain conflicting classes. OSGi eliminates this burden, letting you install and run as many different JAR versions as required in a single JVM instance. ...展开收缩
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