Examples of java.lang.invoke.CallSite.dynamicInvoker()

java.lang.invoke.CallSite.dynamicInvoker()
Produces a method handle equivalent to an invokedynamic instruction which has been linked to this call site.
This method is equivalent to the following code:
```
 {@code MethodHandle getTarget, invoker, result; getTarget = MethodHandles.publicLookup().bind(this, "getTarget", MethodType.methodType(MethodHandle.class)); invoker = MethodHandles.exactInvoker(this.type()); result = MethodHandles.foldArguments(invoker, getTarget)}
```
@return a method handle which always invokes this call site's current target

    receiver = varargsChecking();
    assertThat((String) concat.dynamicInvoker().invokeWithArguments(receiver, "a"), is("a"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class), 0);
    receiver = varargsChecking();
    assertThat((String) concat.dynamicInvoker().invokeWithArguments(receiver), is(""));
  }


  @Test
  public void check_field_getter() throws Throwable {
    CallSite property = MethodInvocationSupport.bootstrap(lookup(), "property", methodType(Object.class, Object.class), 0);

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  public void check_field_getter() throws Throwable {
    CallSite property = MethodInvocationSupport.bootstrap(lookup(), "property", methodType(Object.class, Object.class), 0);
    FieldAccessors receiver = new FieldAccessors();
    receiver.property = "foo";


    Object result = property.dynamicInvoker().invokeWithArguments(receiver);
    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("foo"));
  }

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  public void check_field_setter() throws Throwable {
    CallSite property = MethodInvocationSupport.bootstrap(lookup(), "property", methodType(Object.class, Object.class, Object.class), 0);
    FieldAccessors receiver = new FieldAccessors();
    receiver.property = "undefined";


    property.dynamicInvoker().invokeWithArguments(receiver, "foo");
    assertThat((String) receiver.property, is("foo"));
  }


  @Test(expectedExceptions = NullPointerException.class)
  public void not_nullsafe_invocation() throws Throwable {

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  }


  @Test(expectedExceptions = NullPointerException.class)
  public void not_nullsafe_invocation() throws Throwable {
    CallSite toString = MethodInvocationSupport.bootstrap(lookup(), "toString", methodType(Object.class, Object.class), 0);
    toString.dynamicInvoker().invoke(null);
  }


  @Test
  public void nullsafe_invocation() throws Throwable {
    CallSite toString = MethodInvocationSupport.bootstrap(lookup(), "toString", methodType(Object.class, Object.class), 1);

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  @Test
  public void nullsafe_invocation() throws Throwable {
    CallSite toString = MethodInvocationSupport.bootstrap(lookup(), "toString", methodType(Object.class, Object.class), 1);


    MethodHandle invoker = toString.dynamicInvoker();
    assertThat(invoker.invoke(null), nullValue());
    assertThat((String) invoker.invoke("a"), is("a"));
    assertThat((String) invoker.invoke("b"), is("b"));
    assertThat(invoker.invoke(null), nullValue());
  }

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  public void nullsafe_megamorphic_invocation() throws Throwable {
    CallSite toString = MethodInvocationSupport.bootstrap(lookup(), "toString", methodType(Object.class, Object.class), 1);
    MethodInvocationSupport.InlineCache pic = (MethodInvocationSupport.InlineCache) toString;
    pic.depth = MethodInvocationSupport.InlineCache.MEGAMORPHIC_THRESHOLD + 10;


    MethodHandle invoker = toString.dynamicInvoker();
    assertThat(invoker.invoke(null), nullValue());
    assertThat((String) invoker.invoke("a"), is("a"));
    assertThat((String) invoker.invoke(1), is("1"));
    assertThat((String) invoker.invoke(1L), is("1"));
    assertThat((String) invoker.invoke(Arrays.asList()), is("[]"));

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  @Test
  public void dynamic_object_smoke_tests() throws Throwable {
    DynamicObject a = new DynamicObject();
    DynamicObject b = new DynamicObject();
    CallSite plopper = MethodInvocationSupport.bootstrap(lookup(), "plop", methodType(Object.class, Object.class, Object.class), 1);
    MethodHandle invoker = plopper.dynamicInvoker();


    invoker.invoke(a, 1);
    assertThat(a.get("plop"), is((Object) 1));


    invoker.invoke(b, 1);

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                return null;
            }


            MethodHandle methodHandle = lookup.unreflect(m);
            CallSite callSite = new ConstantCallSite(methodHandle);
            return callSite.dynamicInvoker();


        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

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   * @return the result of the invokedynamic call
   */
  public static Object emulateInvokeDynamic(Class<?> executorClass, Handle handle, Object[] bsmArgs, Object lookup, String indyNameAndDescriptor, Object[] indyParams) {
    try {
      CallSite callsite = callLambdaMetaFactory(bsmArgs,lookup,indyNameAndDescriptor,executorClass);
      return callsite.dynamicInvoker().invokeWithArguments(indyParams);
    } catch (Throwable t) {
      throw new RuntimeException(t);
    }
  }
  // TODO [perf] How about a table of CallSites indexed by invokedynamic number through the class file. Computed on first reference but cleared on reload. Possibly extend this to all invoke types!

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