Kenyth Zeng's Library tagged osgi → View Popular

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08 Dec 09

Symmetric Service Oriented Programming - EclipseCon 2009 Sessions

www.eclipsecon.org/...sessions - Preview

2009 conference OSGi SOA

03 Nov 09

dm Kernel | SpringSource Team Blog

blog.springsource.com/...dm-kernel - Preview

kernel blog springsource spring-dm-server OSGi feature what-is-new release

If you want OSGi modular support for your system apps, but don’t want or need to host web applications, then dm Kernel is what you want.

PackageAdmin (OSGi Service Platform Release 4 Version 4.1)

how to eliminate class loader memory leak when uninstalling a bundle: call the refreshPackages method.

www.osgi.org/...PackageAdmin.html - Preview

OSGi api javadoc package classloader memory leak

If no bundles are specified, this method will update or remove any
packages exported by any bundles that were previously updated or
uninstalled since the last call to this method.
One permissible implementation is to stop and restart the Framework.
3 more annotations...
- Add to the
  graph any bundle that is wired to a package that is currently exported by
  a bundle in the graph.
- Each bundle in the graph that is in the ACTIVE state
  will be stopped as described in the Bundle.stop method.
- The effect of this step is that bundles in the graph are no longer
  RESOLVED.

02 Nov 09

Overview (OSGi Service Platform Release 4 Version 4.1)

www.osgi.org/...index.html - Preview

OSGi api 4.1

The Programming Delusion: I am Visible but am I Accessible?

The difficult part is to define the module boundary so the VM can enforce access and this is still an area of ongoing discussion in the JSR 294 EG. Related to this is also the desire to
have Java compilers begin to understand module boundaries with respect to visibility and also the new module accessibility keyword.

blog.bjhargrave.com/...sible-but-am-i-accessible.html - Preview

java type jvm programming language OSGi modularization starred blog JSR 294

the distinction between visibility and accessibility in Java.
Visibility is whether one type can see another type. In the JLS, this is discussed as observability. In the JVMS, this is about class loading. Basically, this can be described as whether type T is visible to type S. At compile time, this means that the compiler can locate type T when compiling type S. At runtime, this means that the class loader for type S can load (either directly or through delegation) type T. A type can also be visible through reflection. Even if the class loader of type S cannot load type T, type S may come across type T while reflecting. For example, an object may be of type T even though type S directly refers to it via an interface type I.
4 more annotations...
- Accessibility is whether one type can access another type or a member of another type. This is discussed in the JLS and the JVMS. Most people know accessibility by the public, protected, and private keywords.
- If that class has public methods which are not part of the service interface, bundle A is able to call them.
- Adding a module accessibility keyword
- have Java compilers begin to understand module boundaries with respect to visibility and also the new module accessibility keyword.

29 Oct 09

Gosling, OSGi, Jigsaw and Shenanigans | Eclipse Zone

eclipse.dzone.com/...gosling-osgi-jigsaw-and - Preview

OSGi blog discussion java

25 Aug 09

InfoQ: Can the Simple Module System save JSR294?

www.infoq.com/...simple-module-system - Preview

modularization java news JSR 294 OSGi Jigsaw

introduce the world's first concept of a meta-module system.
Many have asked why OpenJDK can't reuse OSGi – but the simple answer is that OSGi is much more than just modularity, and although the core spec (which defines the module layer) is fairly small, licensing issues are still a factor in why this could not happen in any case.
3 more annotations...
- More powerful dynamic modularity could then be used by using those modules within a dynamic module system; but for most use cases, static modularity would be enough.
- When a module depends on a set of packages it does not care which are the modules that provide them. In this case you are free to change the module structure without updating any dependent modules!
- In other words if you use a coarse grained dependency scheme (module dependencies) instead of a fine grained one (package dependencies) you are blocking refactoring on a module level!

24 Aug 09

Viddler.com - Oredev 2008 - Architecture - OSGi Now and Tomorrow - Uploaded by oredev

www.viddler.com/...112 - Preview

OSGi video conference 2008

25 Jul 09

InfoQ: OSGi: The Next Release

www.infoq.com/...osgi-next-release - Preview

OSGi release spec feature toread

12 Jun 09

基于 OSGi 和 Spring 开发 Web 应用

www.ibm.com/...os-cn-osgi-spring - Preview

OSGi spring-dm toread tutorial

06 May 09

Bug 255682 – [aspects] Enable/disable weaving service on a per-bundle basis

bugs.eclipse.org/...show_bug.cgi - Preview

Equinox-Aspects Equinox aop aspectj OSGi

the weaver should only try to
weave bundles that are explicitly in the opt-in list. This can be another
directive in the manifest file.
if a bundle define a require-bundle dependency on an
aspect bundle your bundle will be passed to the weaver and maybe woven with the
aspect.
9 more annotations...
- just by having a standard require-bundle dependency on an aspect bundle A,
  non-aspect bundle B will consume the aspects of A.
  
  Right now, there is the Eclipse-supplementBundle header that does the same
  thing, but in reverse.
- One thing that I like about the aop.xml way of defining the
  aspects is that it works with existing bundles (like spring-aspects.jar)
  without making those bundles explicitly aware of equinox aspects.
- In this "opt-out" case your aspects are woven into dependend bundles unless
  they explicitly prevent those aspects from being woven into them.
  
  If you use "opt-in" instead, these aspects are NOT woven unless the dependend
  bundle explicitly asks for them being woven.
- Import-Package: com.foo.bar;apply-aspects:=true
- The supplementer mechanism is not touched by this. If you define aspects within
  a bundle via aop.xml or the manifest, export the package and supplement another
  bundle, those aspects are being woven into the supplemented bundle as always.
- Currently, if the aspect is visible because of a supplementer definition, the
  exported aspects are always applied (regardless of an aspect-policy).
- Aspect-policy and apply-aspects are most likely going to be used for when an
  aspect bundle wants to publish its aspects as a library with no specific target
  in mind.
- Whereas, the supplementer mechanism is more likely going to be used for when
  the targets are oblivious to the aspects and it is the source bundle imposing
  its aspects on the target.
- For Import-Package, is it reasonable to imagine the developer is
  deliberately selecting a package that exports aspects, and so requiring them to
  explicitly import the AspectJ runtime classes is a reasonable thing to do.

29 Apr 09

Equinox Server-side Quickstart

www.eclipse.org/...http_quickstart.php - Preview

server-side Equinox OSGi servlet-container web-server toread

Building a Server-based Application with Equinox

www.eclipse.org/...server-side - Preview

Equinox servlet server OSGi tutorial eclipse getting-started

put a
check next to the org.eclipse.equinox.http.jetty bundle

28 Apr 09

Equinox Bundles

www.eclipse.org/bundles - Preview

eclipse Equinox opensource OSGi

the Bundles team is responsible
for the Extenstion registry used throughout Eclipse.

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