Examples of java.lang.invoke.CallSite

java.lang.invoke.CallSite
FOLLOWING LINE IS PSEUDOCODE FOR A JVM INSTRUCTION InvokeDynamic[#bootstrapDynamic].baz("baz arg", 2, 3.14); } private static void printArgs(Object... args) { System.out.println(java.util.Arrays.deepToString(args)); } private static final MethodHandle printArgs; static { MethodHandles.Lookup lookup = MethodHandles.lookup(); Class thisClass = lookup.lookupClass(); // (who am I?) printArgs = lookup.findStatic(thisClass, "printArgs", MethodType.methodType(void.class, Object[].class)); } private static CallSite bootstrapDynamic(MethodHandles.Lookup caller, String name, MethodType type) { // ignore caller and name, but match the type: return new ConstantCallSite(printArgs.asType(type)); } } @author John Rose, JSR 292 EG

    assertThat((String) result, is("a-b-c"));
  }


  @Test
  public void check_varags_only() throws Throwable {
    CallSite concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class, Object.class, Object.class), 0);
    VarargsChecking receiver = varargsChecking();


    Object result = concat.dynamicInvoker().invokeWithArguments(receiver, "a", "b", "c");
    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class), 0);
    result = concat.dynamicInvoker().invokeWithArguments(receiver, new String[]{"a", "b", "c"});
    assertThat(result, notNullValue());
    assertThat(result, instanceOf(String.class));
    assertThat((String) result, is("a-b-c"));


    concat = MethodInvocationSupport.bootstrap(lookup(), "defaultConcat", methodType(Object.class, Object.class, Object.class), 0);
    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(""));
  }

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    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);
    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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    assertThat((String) result, is("foo"));
  }


  @Test
  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"));
  }

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


  @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);
  }

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    toString.dynamicInvoker().invoke(null);
  }


  @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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    assertThat(invoker.invoke(null), nullValue());
  }


  @Test
  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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            } else {
                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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   * @param indyParams parameters when the invokedynamic call is made
   * @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);
    }
  }

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        return new FunctionBinding(bindingId, "constant_" + bindingId, callsite, ImmutableList.<ByteCodeNode>of(), true);
    }


    public CallSite bootstrap(String name, MethodType type, long bindingId)
    {
        CallSite callSite = bindings.get(bindingId);
        checkArgument(callSite != null, "Binding %s for function %s%s not found", bindingId, name, type.parameterList());


        return callSite;
    }

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