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Posted to java-user@axis.apache.org by Philippe de Rochambeau <ph...@free.fr> on 2011/11/28 21:00:11 UTC
Setting a service's CLASSPATH at runtime
Hello,
let's say that I create an Axis2 service based on a POJO class, which uses classes stored in large jar files, called, say, a.jar and b.jar, and compile it into an .aar file.
When I run the service on Tomcat, I get a "class not found" error. Adding the jar files to the axis2 WEB-INF/services directory and WEB-INF/lib directory, makes no difference. Is there a parameter you can set to tell Axis2 where to find custom classes/jars at runtime?
Many thanks.
p
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AW: Calling non-multi-threaded C code in an Axis2 service
Posted by Stadelmann Josef <jo...@axa-winterthur.ch>.
Maybe the best is to make your C code thread safe.
If that is too much work then you can think of a barrier
used to synchronize the C-code-callers at the java level.
The barrier goes down before the C code is invoked and
once the legacy-C-code is left, the barrier goes up, and
allows another thread to enter the same legacy-C-code.
The third option I can see is as we do with our legacy server
written in OpenVMS PASCAL, to use / create for each
incoming thread an java-object talking to his own
out-of-process server. Can be done by IPC inter-process-channels
We create for each user-session-thread an out-of-process-server.
As we have long lasting state full sessions, the creation time has no
impact to overall session performance. And in Axis2/J we use
scope="soapsession" to make a session-thread long-lasting,
reaching its own "process-placeholder-object". Talking
to unique objects brings you to state-full-service-providing-objects.
This as opposed to state-less logic. Again, this works only if
you talk to legacy-C-code which is somehow isolated from the
multi thread calling capability of axis2 java sessions. i.e. a
mapping between a thread and a single-threaded-legacy-process
is required.
Josef
-----Ursprüngliche Nachricht-----
Von: robert lazarski [mailto:robertlazarski@gmail.com]
Gesendet: Montag, 28. November 2011 21:55
An: java-user@axis.apache.org
Betreff: Re: Calling non-multi-threaded C code in an Axis2 service
On Mon, Nov 28, 2011 at 5:13 PM, Philippe de Rochambeau <ph...@free.fr> wrote:
> Hello,
>
> I would like to create a Web service based on a class which calls C functions via JNI.
>
> The only problem is that the C functions are legacy and therefore not multi-threaded. In other words, if several people simultaneously call the service, they might cause the C code to crash.
>
> What is the best way to make the Axis2 service handle simultaneous calls without crashing or crashing the C code?
>
> Many thanks.
>wa
> p
>
Just invoke a thread in your service. A few lines of code like this
(untested) would work I think, if I understand correctly ... lots of
options also on how to setup queues, etc. One thing that comes to mind
is I do this type of thing with Spring controlled service beans, which
are loaded as singletons IIRC - that I know works. ymmv. Anyways, hope
this helps.
public class MyService {
private static final ThreadFactory factory = new ThreadFactory();
private ExecutorService executorService =
Executors.newSingleThreadExecutor(factory);
private AtomicBoolean isRunning = new AtomicBoolean();
public OMElement doMyJob(OMElement element) throws XMLStreamException {
execute();
}
public void execute() throws Exception {
try {
if (isRunning.compareAndSet(false, true)) {
// execute asynchronously and return immediately
executorService.execute(new Runnable() {
public void run() {
try {
// put code here
} catch (Exception ex) {
logger.error(ex.getMessage(), ex);
}
}
});
}
} finally {
isRunning.set(false);
}
}
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Re: Calling non-multi-threaded C code in an Axis2 service
Posted by robert lazarski <ro...@gmail.com>.
On Mon, Nov 28, 2011 at 5:13 PM, Philippe de Rochambeau <ph...@free.fr> wrote:
> Hello,
>
> I would like to create a Web service based on a class which calls C functions via JNI.
>
> The only problem is that the C functions are legacy and therefore not multi-threaded. In other words, if several people simultaneously call the service, they might cause the C code to crash.
>
> What is the best way to make the Axis2 service handle simultaneous calls without crashing or crashing the C code?
>
> Many thanks.
>wa
> p
>
Just invoke a thread in your service. A few lines of code like this
(untested) would work I think, if I understand correctly ... lots of
options also on how to setup queues, etc. One thing that comes to mind
is I do this type of thing with Spring controlled service beans, which
are loaded as singletons IIRC - that I know works. ymmv. Anyways, hope
this helps.
public class MyService {
private static final ThreadFactory factory = new ThreadFactory();
private ExecutorService executorService =
Executors.newSingleThreadExecutor(factory);
private AtomicBoolean isRunning = new AtomicBoolean();
public OMElement doMyJob(OMElement element) throws XMLStreamException {
execute();
}
public void execute() throws Exception {
try {
if (isRunning.compareAndSet(false, true)) {
// execute asynchronously and return immediately
executorService.execute(new Runnable() {
public void run() {
try {
// put code here
} catch (Exception ex) {
logger.error(ex.getMessage(), ex);
}
}
});
}
} finally {
isRunning.set(false);
}
}
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Calling non-multi-threaded C code in an Axis2 service
Posted by Philippe de Rochambeau <ph...@free.fr>.
Hello,
I would like to create a Web service based on a class which calls C functions via JNI.
The only problem is that the C functions are legacy and therefore not multi-threaded. In other words, if several people simultaneously call the service, they might cause the C code to crash.
What is the best way to make the Axis2 service handle simultaneous calls without crashing or crashing the C code?
Many thanks.
p
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