I doubt there is a problem, you're probably making a minor error. I am the developer of HiveMind, it is a web app platform that relies entirely on scripting engines. It doesn't cache bindings but rather caches the engine and creates a new binding to handle every request.
You can access a demo instance: http://demo.crudzilla.com:7000/ Login with: developer/developer I have created a test file in: /com/crudzilla/cloudTest/web/binding-test.ste Put your code in there and save, I'll take a look to see what might be missing. On Tue, Dec 6, 2016 at 8:04 AM, yikes aroni <yikesar...@gmail.com> wrote: > Hmm.... it works if i instantiate the SimpleBinding obj and then putAll > the bindings from the original bindings obj. > > Bindings bSimple = new SimpleBindings(); > bSimple.putAll(bEngine); > > Otherwise they either remain the same object or are bound in some way s.t. > changes to bEngine are in bSimple. This just seems strange to me. Still > curious to know what the reason for this is, despite having found a > workaround. > > > > On Tue, Dec 6, 2016 at 7:59 AM, yikes aroni <yikesar...@gmail.com> wrote: > >> Thanks for your response Edmond -- the problem is that a simplebindings >> object still gets all the changes to the original bindings.... see below: >> >> // put variable globalA into the ScriptContext.ENGINE_SCOPE bindings >> se.eval("globalA = 'testA';"); >> // Snapshot the bindings from the engine. >> Bindings bEngine = se.getBindings(ScriptContext.ENGINE_SCOPE ); >> // print the bindings to confirm there is only one variable in them. --> >> TRUE >> printBindings(bEngine); >> ------------------------ >> globalA = testA >> // At this point there is only 'globalA' in the bindings so instantiate >> simplebindings: >> Bindings bSimple = new SimpleBindings(bEngine); >> // Verify by printing the bindings >> printBindings(bSimple); >> ------------------------ >> globalA = testA >> // put variable globalB into the ScriptContext.ENGINE_SCOPE bindings >> se.eval("globalB = 'testB';"); >> // print the bindings. Now both variables are present........... WHY??? >> printBindings(bEngine); >> ------------------------ >> globalA = testA >> globalB = testB >> // But look -- they are in the simple bindings obj as well! >> printBindings(bSimple);------------------------ >> globalA = testA >> globalB = testB >> >> That's precisely what i don't get --> Why are variables added to the >> engine bindings *after* instantiating the simpleBindings showing up in the >> simpleBindings object? >> >> And how do i avoid that? >> >> thanks >> >> On Mon, Dec 5, 2016 at 3:01 PM, Edmond Kemokai <ekemo...@gmail.com> >> wrote: >> >>> Why don't you create instances of SimpleBinding and use those as needed? >>> Use ScriptEngine.setBindings to reset the binding... >>> >>> On Dec 5, 2016 1:36 PM, "yikes aroni" <yikesar...@gmail.com> wrote: >>> >>>> I want to cache ScriptEngine bindings for reuse. The basic algo would be >>>> >>>> 1) Build up my ScriptEngine (SE) with stuff i need. >>>> 2) Snapshot the bindings -- i.e., cache them >>>> Use engine.getBindings(ScriptContext.ENGINE_SCOPE) >>>> 3) Use the SE for stuff that might modify its state. >>>> 4) When done, replace the SE's bindings with my snapshotted bindings >>>> Use engine.setBindings(_bindings_, ScriptContext.ENGINE_SCOPE) >>>> 5) I now have a "fresh" SE to use. >>>> >>>> The problem is that this doesn't work as expected. The cached bindings >>>> appear to point to the actual SE bindings and therefore whatever gets >>>> added >>>> to the SE bindings, also gets added to the cached bindings. Here's some >>>> code to show how it's not doing what i would expect. >>>> >>>> public class TempEngineTest { >>>> >>>> static ScriptEngineManager seManager = new ScriptEngineManager(); >>>> static ScriptEngine se = seManager.getEngineByName("nashorn"); >>>> public static void printBindings(Map<String, Object> bindings) { >>>> for (Map.Entry<String, Object> entry : bindings.entrySet()) { >>>> System.out.println(entry.getKey() + " = " + entry.getValue()); >>>> } >>>> } >>>> public static void main(String[] a) throws Exception { >>>> // put variable globalA into the ScriptContext.ENGINE_SCOPE bindings >>>> se.eval("globalA = 'testA';"); >>>> // Snapshot the bindings from the engine. >>>> Bindings bEngine = se.getBindings(ScriptContext.ENGINE_SCOPE ); >>>> // print the bindings to confirm there is only one variable in them. --> >>>> TRUE >>>> printBindings(bEngine); >>>> // put variable globalB into the ScriptContext.ENGINE_SCOPE bindings >>>> se.eval("globalB = 'testB';"); >>>> // print the bindings. Now both variables are present........... WHY??? >>>> printBindings(bEngine); >>>> } >>>> } >>>> >>>> I've seen suggestions to cache and reuse bindings in various articles, >>>> but >>>> no specific code for doing so. How do i accomplish this in actual code? >>>> >>>> thanks >>>> >>> >> >
