How to callback from a webservice to a workflow node?

I've initiated a conversation with a webservice from a workflow. The workflow
goes on until it gets to the point where it must stop and wait for the callback
from the webservice. I'd like it to passively wait (not polling in a loop).
I'm an intermediate with webservices, not an expert - I think the callback handler
should be in the workflow somewhere and the callback method should be defined
in the webservice - am I completely off-base? Conceptually, could someone explain
how a webservice could callback to a specific node in a workflow?

Hi Lisa,
if you are speaking about Weblogic 8.1, then use Client Response nodes in
the webservice and Control Receive nodes in the calling workflow process.
Regards,
Robert Varga
"Lisa" <[email protected]> wrote in message
news:3fcf9105$[email protected]..
>
I've initiated a conversation with a webservice from a workflow. Theworkflow
goes on until it gets to the point where it must stop and wait for thecallback
from the webservice. I'd like it to passively wait (not polling in aloop).
I'm an intermediate with webservices, not an expert - I think the callbackhandler
should be in the workflow somewhere and the callback method should bedefined
in the webservice - am I completely off-base? Conceptually, could someoneexplain
how a webservice could callback to a specific node in a workflow?

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I have an application that calls back from C to Java in multiple situations. In some, I have been successful using the technique of calling AttachCurrentThread as described, for example, in various places, e.g.,
http://java.sun.com/developer/onlineTraining/Programming/JDCBook/jniref.html#invoke
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                ( HINSTANCE__* )hDll,    // handle of application instance
                0     // identity of thread to install hook for (all threds)      );The keyboard hook functions in Windows by being "injected" into running applications so that it runs in their process space and therein, apparently, lies the problem.
The keyboard hook gets callbacks from Windows whenever a key is pressed. This is the information I want to learn about back in Java. Our current approach is to have the keyboard hook write the key data to shared memory. Then the Java application makes polling calls into the previously mentioned C DLL which checks the shared memory and returns anything it finds. The C DLL is compiled with the current MinGW compiler.
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       -I/c/Programs/Java/JDK15~1.0_0/include/win32
       -L/c/Programs/Java/JDK15~1.0_0/jre/bin \
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undefined reference to `JNI_GetCreatedJavaVMs@12'
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Rick

Thanks for the reply Jim,
I've been compiling in the Msys environment.
I created the jvm.def and generated the jvm.a as you
suggested.
This apparently required copying the jvm.dll from
/c/Programs/Java/JDK15~1.0_0/jre/bin/client
de]
to my working directory. Before I did that I got a
message
about stripping the path components from the dll
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Then I tried to make the DLL in the fashion I had
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-I/c/Programs/Java/JDK15~1.0_0/include/win32 \
L/c/Programs/Java/JDK15~1.0_0/jre/bin/client \
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jvm.a \
JKeyboardInterface_wrapper.cpp \
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JKeyboardInterface.cpp \
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This resulted in this error:
Creating library file: libJKeyboardInterface.a
K:/DOCUME~1/rick/LOCALS~1/Temp/ccU1daaa.o:JKeyboardInt
erface.cpp:(.text+0xafb):
undefined reference to
`_imp__JNI_GetCreatedJavaVMs@12'
collect2: ld returned 1 exit status
Hmmmmm. What happens if you remove the '-Wl,--out-implib,libJKeyboardInterface.a'? It seems to be failing in the step creating the static lib, which may prevent the DLL from being properly created.
Since this was a different undefined reference, I
re-did the jmv.def step
using imp_JNI_GetCreatedJavaVMs@12 instead of
JNI_GetCreatedJavaVMs@12
This generated the same error.Yeah. I'm sure I never had to do anything like that.
>
Then I tried to use dllwrap with both versions of the
jvm.a generated above::
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--add-stdcall-alias \
-o JKeyboardInterface.dll \
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K:/DOCUME~1/rick/LOCALS~1/Temp/ccSccaaa.o:JKeyboardInt
erface.cpp:(.text+0xafb):
undefined reference to `JNI_GetCreatedJavaVMs@12'
ollect2: ld returned 1 exit statusI'm not clear why the two approaches (g++ -shared and
dllwrap) yield different reference problems.
I've read that dllwrap is "deprecated" Probably.
(http://www.mingw.org/MinGWiki/index.php/dllwrap).
Do you have any other suggestions about how to do
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http://www.inonit.com/cygwin/
Msys (which is Mingw) follows cygwin pretty closely.
I'm not near a Windows machine to try this at the moment. All I can say is that I have an application using CreateJavaVM, compiled with MSYS and it works. CreateJavaVM has the same problems as GetCreatedJavaVMs that you are seeing. The root cause is that the jvm.lib shipped with the JDK for Windows is not compatible with GCC. Hence the need to create the jvm.a library.
I build my code using an ANT script. It build the objects first and then links them. Deciphering the build script, it looks like the two steps would have the following command line syntax:
Compile to object files:
gcc -D REENTRANT -I <paths to include> somefiles.cpp somefiles.c
(I have a mix of C and C++)
Link object files to create DLL:
gcc -shared -D REENTRANT --kill-at -lstdc++ somefiles.o jvm.a
Try it in two steps and see if it makes a difference.
>
Is trying to use GetCreatedJavaVMs the correct
approach here?
If more than one exists, how do I determine which one
I want to attach to and get an env pointer for?From you original post, it is difficult to understand exactly what you are trying to achieve.
It seems like you are starting with a Java app that calls into some native code to create the keyboard hook. This hook will then call a callback method in native code when a key is pressed. You want the Java code to see this and act appropriately.
In Java callbacks are usually handled with events. Just have your native code fire an event in Java and have a Listener on the Java side. I do this in some of my code. Say I have an event called FooEvent and a listener called FooListener. There is also an object called Bar which can fire FooEvents and have FooListeners attached to it. The Bar class has an addFooListener() method which is actually a native method. The native implementation sets up the callback stuff on the native side. When an event occurs on the native side, the callback function is called and it does something like this:
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jmethodID mid;
cls = env->GetObjectClass(javaSource);
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The Bar class has a fireSomeEvent() method, which calls the event listeners using the event generator idiom:
http://www.javaworld.com/javaworld/jw-09-1998/jw-09-techniques.html
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Jim S.

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Last edited by falconindy (2012-03-18 03:56:38)

How to callback from a webservice to a workflow node?

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