Re: [Quickfix-developers] HELP - linux shared library - and now ???

[<OM...@th...>]

Mustafa,

We have succesfully ported the java JNI layer under linux.  Thanks to
feedback from Joerg Thoennes and Raphael M. Grochtmann from Macdonald
Associates GmbH in Germany, and to MEK Securities in Connecticut for
subsidizing this work.

Currently we are still building quickfix as a static library, and have
created a quickfix_jni.so which statically links it in.  It is a slightly
larger footprint but works for now.

The java library for linux will probably be released sometime next week.

--oren



|---------+----------------------------------------------->
|         |           Mustafa Radi <m....@ka...>      |
|         |           Sent by:                            |
|         |           qui...@li...ur|
|         |           ceforge.net                         |
|         |                                               |
|         |                                               |
|         |           10/10/2002 03:10 PM                 |
|         |                                               |
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  |       To:       qui...@li...                                    |
  |       cc:                                                                                    |
  |       Subject:  [Quickfix-developers] HELP - linux shared library - and now ???              |
  >----------------------------------------------------------------------------------------------|




Hi there,

I am new to that group, but like the approch of how this fix-library is
generated. Thats why
I started to create the shared library today. Well, I have now a working
shared library under
linux <quickfix.so> and can start tha java-application
"Banzai".java - no problems with the shared library but, as soon as I want
to access a native method I get "java.lang.UnsatisfiedLinkError" which
occures because the c++-sources in the
directory src/java is not compiled and linked to the library generated in
src/C++.

Thats fine so lets try to compile the directory src/java with all the
generated classes from javah ...
I created a Makefile since the existing once are ignored but
URGS - this is no "ansi-C" standard but seems to be BorlandC++ code. There
are includefiles
that are NOT available under unix and all conversion-methods as well as
operators are
not compatible to g++. Even the build.xml file with ant is only available
for windows because
it uses several windows executeables ...
Now I am realy frustrated - after hours of work with the shared library -
no satisfaction in the end - sometimes I don't like computers ;-)

But perhaps sombody out there can help to solve these final problems now.
Here is what must
be done to get a shared library that resolves all symbols and manages
exeptiopns:

(1) first of all you have to compile with the option -fPIC (this makes
address-independent code which is necessary for shared libraries)
        ==> to do that change the line in configure.in from
                 < CFLAGS="-D_XOPEN_SOURCE=500 $XML_CFLAGS"
                  to
                 > CFLAGS="-D_XOPEN_SOURCE=500 -fPIC $XML_CFLAGS"

(2) change the line in src/C++/Makefile.in from

                   < libquickfix_la_LDFLAGS = -static
                    to
                    >  libquickfix_la_LDFLAGS = -shared

(3) call ./bootstrap
              ./configure --enable-shared

(4) this will generate a shared library but because exceptions are used
there are still some
symbols not linked to the library :-(
If you look at the output of the link commands you will see, a line like

gcc -shared  Session.lo SessionFactory.lo Parser.lo Settings.lo
ConfigLexer.lo MessageStore.lo SocketServer.lo SocketConnector.lo
SocketStream.lo Acceptor.lo Initiator.lo SocketAcceptor.lo
SocketInitiator.lo SocketMonitor.lo SocketConnection.lo
ThreadedSocketAcceptor.lo ThreadedSocketInitiator.lo
ThreadedSocketConnection.lo FileStore.lo Dictionary.lo DataDictionary.lo
SessionSettings.lo MessageSorters.lo Utility.lo  -L/usr/lib
/usr/lib/libxml2.so -lz -lm -liberty  -Wl,-soname -Wl,libquickfix.so.0 -o
.libs/libquickfix.so.0.0.0


the problem is, that gcc is using the c-link library and NOT c++
link-library - thus exceptions
are NOT handled correctly in libraries. To achieve a working library you
must copy the complete
line and replace gcc with g++ in the directory src/C++ >> that's it !!!

g++ -shared  Session.lo SessionFactory.lo Parser.lo Settings.lo
ConfigLexer.lo MessageStore.lo SocketServer.lo SocketConnector.lo
SocketStream.lo Acceptor.lo Initiator.lo SocketAcceptor.lo
SocketInitiator.lo SocketMonitor.lo SocketConnection.lo
ThreadedSocketAcceptor.lo ThreadedSocketInitiator.lo
ThreadedSocketConnection.lo FileStore.lo Dictionary.lo DataDictionary.lo
SessionSettings.lo MessageSorters.lo Utility.lo  -L/usr/lib
/usr/lib/libxml2.so -lz -lm -liberty  -Wl,-soname -Wl,libquickfix.so.0 -o
.libs/libquickfix.so.0.0.0

===> yeahhhh - we have a shared library

(5) unfortunatelly java doesn't know anything about our new library - thus
insert in your main class
 public class myMain {
    static {
        System.loadLibrary("quickfix");
    }
    static public Main(String args[]) {
        ... blabla ...
    }
}

and don't forget to start java with the option -Djava.library.path


e.g. java -Djava.library.path=/usr/local/lib myTest

That's all.


I hope I could help to get towards a java-library under linux - I really
need that, but
currently there seems to be no chance instead of developing the complete
access-layer
in the directory src/java completly new - that sounds ugly !

with best regards

P.S. by the way - great job thoughtworks.COM - will there be a fix for the
java-code ? soon ???