Examples of java.lang.invoke.SwitchPoint

java.lang.invoke.SwitchPoint
following steps may be repeated to re-use the same switch point: MethodHandle worker1 = MH_strcat; MethodHandle worker2 = MethodHandles.permuteArguments(MH_strcat, MH_strcat.type(), 1, 0); MethodHandle worker = spt.guardWithTest(worker1, worker2); assertEquals("method", (String) worker.invokeExact("met", "hod"));}SwitchPoint.invalidateAll(new SwitchPoint[] spt }); assert(spt.hasBeenInvalidated()); assertEquals("hodmet", (String) worker.invokeExact("met", "hod")); }
Discussion: Switch points are useful without subclassing. They may also be subclassed. This may be useful in order to associate application-specific invalidation logic with the switch point. Notice that there is no permanent association between a switch point and the method handles it produces and consumes. The garbage collector may collect method handles produced or consumed by a switch point independently of the lifetime of the switch point itself.
Implementation Note: A switch point behaves as if implemented on top of {@link MutableCallSite}, approximately as follows:
```
 {@code}public class SwitchPoint  private static final MethodHandle K_true  = MethodHandles.constant(boolean.class, true), K_false = MethodHandles.constant(boolean.class, false); private final MutableCallSite mcs; private final MethodHandle mcsInvoker; public SwitchPoint() { this.mcs = new MutableCallSite(K_true); this.mcsInvoker = mcs.dynamicInvoker(); } public MethodHandle guardWithTest( MethodHandle target, MethodHandle fallback) { // Note:  mcsInvoker is of type ()boolean. // Target and fallback may take any arguments, but must have the same type. return MethodHandles.guardWithTest(this.mcsInvoker, target, fallback); } public static void invalidateAll(SwitchPoint[] spts) { List<MutableCallSite> mcss = new ArrayList<>(); for (SwitchPoint spt : spts)  mcss.add(spt.mcs); for (MutableCallSite mcs : mcss)  mcs.setTarget(K_false); MutableCallSite.syncAll(mcss.toArray(new MutableCallSite[0])); } } }
```
@author Remi Forax, JSR 292 EG

        }
      }
      
      void setValue(Object value) {
        synchronized(lock) {
          SwitchPoint switchPoint = this.switchPoint;
          this.value = value;
          this.switchPoint = new SwitchPoint();
          SwitchPoint.invalidateAll(new SwitchPoint[] {switchPoint});
        }
      }

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    // INITIAL AND FALLBACK METHODS FOR POST BOOTSTRAP
    ////////////////////////////////////////////////////////////////////////////


    public static IRubyObject constantFallback(RubyConstantCallSite site, 
            AbstractScript script, ThreadContext context, int scopeIndex) {
        SwitchPoint switchPoint = (SwitchPoint)context.runtime.getConstantInvalidator().getData();
        StaticScope scope = script.getScope(scopeIndex);
        IRubyObject value = scope.getConstant(site.name());
        
        if (value != null) {
            if (RubyInstanceConfig.LOG_INDY_CONSTANTS) LOG.info("constant " + site.name() + " bound directly");
            
            MethodHandle valueHandle = constant(IRubyObject.class, value);
            valueHandle = dropArguments(valueHandle, 0, AbstractScript.class, ThreadContext.class);


            MethodHandle fallback = insertArguments(
                    findStatic(InvokeDynamicSupport.class, "constantFallback",
                    methodType(IRubyObject.class, RubyConstantCallSite.class, AbstractScript.class, ThreadContext.class, int.class)),
                    0,
                    site);
            fallback = insertArguments(fallback, 2, scopeIndex);


            MethodHandle gwt = switchPoint.guardWithTest(valueHandle, fallback);
            site.setTarget(gwt);
        } else {
            value = scope.getModule()
                    .callMethod(context, "const_missing", context.runtime.newSymbol(site.name()));
        }

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        return value;
    }


    public static boolean constantBooleanFallback(RubyConstantCallSite site, 
            AbstractScript script, ThreadContext context, int scopeIndex) {
        SwitchPoint switchPoint = (SwitchPoint)context.runtime.getConstantInvalidator().getData();
        StaticScope scope = script.getScope(scopeIndex);
        IRubyObject value = scope.getConstant(site.name());
        
        if (value != null) {
            if (RubyInstanceConfig.LOG_INDY_CONSTANTS) LOG.info("constant " + site.name() + " bound directly");
            
            MethodHandle valueHandle = constant(boolean.class, value.isTrue());
            valueHandle = dropArguments(valueHandle, 0, AbstractScript.class, ThreadContext.class);


            MethodHandle fallback = insertArguments(
                    findStatic(InvokeDynamicSupport.class, "constantBooleanFallback",
                    methodType(boolean.class, RubyConstantCallSite.class, AbstractScript.class, ThreadContext.class, int.class)),
                    0,
                    site);
            fallback = insertArguments(fallback, 2, scopeIndex);


            MethodHandle gwt = switchPoint.guardWithTest(valueHandle, fallback);
            site.setTarget(gwt);
        } else {
            value = scope.getModule()
                    .callMethod(context, "const_missing", context.runtime.newSymbol(site.name()));
        }

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    }


    public static IRubyObject invoke(InvokeSite site, ThreadContext context, IRubyObject self) throws Throwable {
        RubyClass selfClass = self.getMetaClass();
        String methodName = site.name;
        SwitchPoint switchPoint = (SwitchPoint)selfClass.getInvalidator().getData();
        CacheEntry entry = selfClass.searchWithCache(methodName);
        DynamicMethod method = entry.method;


        if (methodMissing(entry, CallType.NORMAL, methodName, self)) {
            return callMethodMissing(entry, CallType.NORMAL, context, self, methodName);

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    }


    public static IRubyObject invoke(InvokeSite site, ThreadContext context, IRubyObject self, IRubyObject arg0) throws Throwable {
        RubyClass selfClass = self.getMetaClass();
        String methodName = site.name;
        SwitchPoint switchPoint = (SwitchPoint)selfClass.getInvalidator().getData();
        CacheEntry entry = selfClass.searchWithCache(methodName);
        DynamicMethod method = entry.method;


        if (methodMissing(entry, CallType.NORMAL, methodName, self)) {
            return callMethodMissing(entry, CallType.NORMAL, context, self, methodName, arg0);

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    }


    public static IRubyObject invoke(InvokeSite site, ThreadContext context, IRubyObject self, IRubyObject arg0, IRubyObject arg1) throws Throwable {
        RubyClass selfClass = self.getMetaClass();
        String methodName = site.name;
        SwitchPoint switchPoint = (SwitchPoint)selfClass.getInvalidator().getData();
        CacheEntry entry = selfClass.searchWithCache(methodName);
        DynamicMethod method = entry.method;


        if (methodMissing(entry, CallType.NORMAL, methodName, self)) {
            return callMethodMissing(entry, CallType.NORMAL, context, self, methodName);

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    }


    public static IRubyObject invoke(InvokeSite site, ThreadContext context, IRubyObject self, IRubyObject arg0, IRubyObject arg1, IRubyObject arg2) throws Throwable {
        RubyClass selfClass = self.getMetaClass();
        String methodName = site.name;
        SwitchPoint switchPoint = (SwitchPoint)selfClass.getInvalidator().getData();
        CacheEntry entry = selfClass.searchWithCache(methodName);
        DynamicMethod method = entry.method;


        if (methodMissing(entry, CallType.NORMAL, methodName, self)) {
            return callMethodMissing(entry, CallType.NORMAL, context, self, methodName);

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    }


    public static IRubyObject invokeSelf(InvokeSite site, ThreadContext context, IRubyObject self) throws Throwable {
        RubyClass selfClass = self.getMetaClass();
        String methodName = site.name;
        SwitchPoint switchPoint = (SwitchPoint)selfClass.getInvalidator().getData();
        CacheEntry entry = selfClass.searchWithCache(methodName);
        DynamicMethod method = entry.method;


        if (methodMissing(entry, CallType.FUNCTIONAL, methodName, self)) {
            return callMethodMissing(entry, CallType.FUNCTIONAL, context, self, methodName);

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    public static IRubyObject invoke(InvokeSite site, ThreadContext context, IRubyObject self, Block block) throws Throwable {
        // TODO: literal block handling of break, etc
        RubyClass selfClass = self.getMetaClass();
        String methodName = site.name;
        SwitchPoint switchPoint = (SwitchPoint)selfClass.getInvalidator().getData();
        CacheEntry entry = selfClass.searchWithCache(methodName);
        DynamicMethod method = entry.method;


        if (methodMissing(entry, CallType.NORMAL, methodName, self)) {
            return callMethodMissing(entry, CallType.NORMAL, context, self, methodName);

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    public static IRubyObject invoke(InvokeSite site, ThreadContext context, IRubyObject self, IRubyObject arg0, Block block) throws Throwable {
        // TODO: literal block handling of break, etc
        RubyClass selfClass = self.getMetaClass();
        String methodName = site.name;
        SwitchPoint switchPoint = (SwitchPoint)selfClass.getInvalidator().getData();
        CacheEntry entry = selfClass.searchWithCache(methodName);
        DynamicMethod method = entry.method;


        if (methodMissing(entry, CallType.NORMAL, methodName, self)) {
            return callMethodMissing(entry, CallType.NORMAL, context, self, methodName, arg0);

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org.jruby.ir.targets.Bootstrap

org.jruby.ir.targets.InvokeSite

org.jruby.runtime.invokedynamic.InvokeDynamicSupport

org.jruby.runtime.opto.FailoverSwitchPointInvalidator

org.jruby.runtime.opto.SwitchPointInvalidator

st.gravel.support.jvm.runtime.AlmostFinalValue$AlmostFinalCallSite

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