Hindess .Thanks for the help ! I realized that this far more complex than I thought before . So I think I need a deeper look into both osgi and harmony . Here are several things I don't qiute understand and I noted them below.May be it's because I am not quite familiar with the low level , classloading details . thanks!
2009/5/19 Mark Hindess <[email protected]> > > In message <[email protected]>, > tian > galaxy writes: > > > > OK ,thanks .Seems the minimal class set has been defined by the osgi. > > Not sure how this helps though. The OSGi Minimum Execution Environment > says what is theoretically the minimum required to run OSGi. What we > need to concern ourselves with is the *practical* minimum and that > really depends on our implementation details. > > I don't think that we should implement OSGi in the VM. Instead the > existing bootstrap classloader should load the OSGi framework (with > a unique classloader) If we load the osgi with the bootstrap class loader , why comes a unique class loader? Do you mean the bootstrap class loader should delegate the loading to the 'unique class loader '? and the system classes (with a "temporary" > classloader). Again ,the relation between temporary and bootstrap classloder ?And why temporary ? > Once the OSGi framework is configured the system classes > need to be moved to the correct classloader for the OSGi bundle to which > they belong. > > This means that during the initial starting-OSGi-framework phase > the OSGi bundle import/exports will not be enforced but, other than > implementing OSGi in the VM, I don't see how to avoid this. > > The multiplicity of bootstrap classloaders still needs to be hidden > since the API demands that getClassLoader should return null for the > bootstrap classloader(s). > > The biggest problem is probably how to implement this as VM-independent > API such that a VM wanting to implement OSGi had to provide only a > minimal C/Java interface in order to gain OSGi support. > > Regards, > Mark. > > > I will look more closely on this problems and let you know if there some > > progresses made. > > Thanks a lot ! > > > 2009/5/18 Pavel Pervov <[email protected]> > > > > > I do not know osgi model in detail, but what minimal set of classes is > > > needed to start osgi model itself? Then we could delegate to "system" > > > bundle loader from bootstrap classloader. > > > > > > 2009/5/18, tian galaxy <[email protected]>: > > > > Yes , implement osgi loading model in there is too complex. > > > > > > > > We know some modules are more important than others , performing some > > > > fundamental , basic functions . > > > > Is it possible to only load these more" basic " modules with > bootstrap > > > class > > > > loader and make the other modules work the osgi bundle? > > > > Actually I don't quite understand why system classes could only be > loaded > > > by > > > > bootstrap class loader?I noticed that there are some safety concerns > > > > ,is there any reasons other than that? > > > > Thanks ! > > > > > > > > > > > > 2009/5/18 Pavel Pervov <[email protected]> > > > > > > > >> Short answer is "no". You'll have to implement osgi loading model > > > >> inside bootstrap classloader. Is it too complex? > > > >> > > > >> 2009/5/18, tian galaxy <[email protected]>: > > > >> > Hi Pavel. > > > >> > > > > >> > Thanks. > > > >> > Yes ,that's right .My question is whether there is a way to load > the > > > >> system > > > >> > class by class loader other than the bootstrap class loader ? > > > >> > If we could load the system class by different loaders other than > the > > > >> > bootstrap class loader then there is a chance to make the harmony > > > >> > runtime > > > >> to > > > >> > be osgi-ed. > > > >> > I trying to work on this problem . Do you have any suggestions ? > > > >> > > > > >> > > > > >> > 2009/5/18 Pavel Pervov <[email protected]> > > > >> > > > > >> >> Tian, > > > >> >> System classes are all loaded with bootstrap classloader. It is > > > >> >> written in C++ and is located in > > > >> >> working_vm/vm/vmcore/src/class_support/classloader.cpp > > > >> >> > > > >> >> 2009/5/17, tian galaxy <[email protected]>: > > > >> >> > Hi all > > > >> >> > I have a question about the classloading in the drlvm. > > > >> >> > > > > >> >> > I know that there are kernel library inside the drlvm such as > > > >> >> > java.lang.classloader, which enclose the the systemclassloader. > And > > > >> this > > > >> >> > class is loaded and used in the process of creating VM . > > > >> >> > While the systemclassloader is a subtype of urlclassloader > which is > > > >> >> > in > > > >> >> the > > > >> >> > "luni" module.So does the JNI_CreateJavaVM > > > >> >> > also load the urlclassloader in the boot procedure of vm ?(I > failed > > > >> >> > to > > > >> >> > search related code in the source code of drlvm). > > > >> >> > If so , when ?Before or after the jni available ? > > > >> >> > Since I am trying to implement the osgi on harmony and the osgi > > > works > > > >> >> with > > > >> >> > bundles (modules) , I think I need to know the procedure of > booting > > > >> and > > > >> >> > loading of class from different modules at the start up time. > > > >> >> > Any clue about this ?Thanks > > > >> >> > > > > >> >> > plus,do we have the source code of java.exe ?Where? > > > >> >> > > > > >> >> > -- > > > >> >> > Regards > > > >> >> > Michael Tian > > > >> >> > > > > >> >> > > > >> > > > > >> > > > > >> > > > > >> > -- > > > >> > Regards > > > >> > Michael Tian > > > >> > > > > >> > > > > > > > > > > > > > > > > -- > > > > Regards > > > > Michael Tian > > > > > > > > > > > > > > > -- > > Regards > > Michael Tian > > > > --0016363ba4b87ec6cc046a2f8544-- > > > > > -- Regards Michael Tian
