Hi,
it seems I have a problem understanding Nashorn’s bindings...
I have multiple scripts, each independent of each other. They should run
concurrently with their own context and engine scope bindings. This is created
as follows for each script:
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName((String)
entity.getProperty("script-language").getValue());
if (engine == null)
throw new Exception("Engine for script-language '" +
entity.getProperty("script-language").getValue() + "' not found!");
ScriptContext newContext = new SimpleScriptContext();
streamContext.engineScope = newContext.getBindings(ScriptContext.ENGINE_SCOPE);
Internally we have a Java-based processor which calls Javascript functions
(callbacks). It is always the same thread.
It works fine when I start a script the first time. If I stop it (without
stopping the JVM) and restart it (it runs through the code above) or if I run
another script concurrently, I’m getting problems in so far that calls inside a
Javascript callback to Java objects that set data don’t work. The data is not
null on the Javascript callback but null inside the Java method.
Here is an example callback:
stream.create().memoryGroup("queues", "name").onCreate(function (memoryGroup,
key) {
stream.create().memory(key);
print("Add:"+ key+"="+stream.memory(key));
});
The above “stream.create().memory(key)” is a Java method that has a printout:
AddMem: orderpos, mem=HeapMemory{name='orderpos’}
But when I retrieve it with "stream.memory(key)” in the print statement of the
Javascript function I’m getting:
Add:orderpos=null
For me this points to the bindings, e.g. a binding from a previous running
instance of the script or something else. Can somebody provide some help? What
do I need to do to have always a clean instance of a binding when I rerun a
script without stopping the JVM?
Thanks,
Andreas
--
Andreas Mueller
IIT Software GmbH
http://www.swiftmq.com
IIT Software GmbH
Münsterstr. 111, 48145 Münster, Germany
Phone: +49 (0)2506 3049340
Managing Director: Andreas Müller
District Court: Amtsgericht Münster, HRB 16294
VAT-No: DE199945912
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