Examples of java.lang.invoke.MethodHandle.invokeExact()

java.lang.invoke.MethodHandle.invokeExact()
Invokes the method handle, allowing any caller type descriptor, but requiring an exact type match. The symbolic type descriptor at the call site of {@code invokeExact} mustexactly match this method handle's {@link #type type}. No conversions are allowed on arguments or return values.
When this method is observed via the Core Reflection API, it will appear as a single native method, taking an object array and returning an object. If this native method is invoked directly via {@link java.lang.reflect.Method#invoke java.lang.reflect.Method.invoke}, via JNI, or indirectly via {@link java.lang.invoke.MethodHandles.Lookup#unreflect Lookup.unreflect}, it will throw an {@code UnsupportedOperationException}. @param args the signature-polymorphic parameter list, statically represented using varargs @return the signature-polymorphic result, statically represented using {@code Object} @throws WrongMethodTypeException if the target's type is not identical with the caller's symbolic type descriptor @throws Throwable anything thrown by the underlying method propagates unchanged through the method handle call

        MethodHandle handle = Binder
                .from(void.class, Fields.class, String.class)
                .setFieldQuiet(LOOKUP, "instanceField");


        assertEquals(MethodType.methodType(void.class, Fields.class, String.class), handle.type());
        handle.invokeExact(fields, "modified");
        assertEquals("modified", fields.instanceField);
    }


    @Test
    public void testSetStatic() throws Throwable {

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            MethodHandle handle = Binder
                    .from(void.class, String.class)
                    .setStatic(LOOKUP, Fields.class, "staticField");


            assertEquals(MethodType.methodType(void.class, String.class), handle.type());
            handle.invokeExact("modified");
            assertEquals("modified", Fields.staticField);
        } finally {
            Fields.staticField = "initial";
        }
    }

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            MethodHandle handle = Binder
                    .from(void.class, String.class)
                    .setStaticQuiet(LOOKUP, Fields.class, "staticField");


            assertEquals(MethodType.methodType(void.class, String.class), handle.type());
            handle.invokeExact("modified");
            assertEquals("modified", Fields.staticField);
        } finally {
            Fields.staticField = "initial";
        }
    }

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                .from(void.class, int.class, String.class)
                .nop();
        
        assertEquals(MethodType.methodType(void.class, int.class, String.class), handle.type());
        try {
            handle.invokeExact(1, "foo");
        } catch (Throwable t) {
            assertTrue("should not reach here", false);
        }
    }

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                .from(void.class, BlahException.class)
                .throwException();
        
        assertEquals(MethodType.methodType(void.class, BlahException.class), handle.type());
        try {
            handle.invokeExact(new BlahException());
            assertTrue("should not reach here", false);
        } catch (BlahException be) {
        }
    }

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                .tryFinally(post)
                .invokeStatic(LOOKUP, BinderTest.class, "setZeroToFoo");


        assertEquals(MethodType.methodType(void.class, String[].class), handle.type());
        String[] stringAry = new String[1];
        handle.invokeExact(stringAry);
        assertEquals("foofinally", stringAry[0]);
    }


    @Test
    public void testTryFinally2() throws Throwable {

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                .invokeStatic(LOOKUP, BinderTest.class, "setZeroToFooAndRaise");


        assertEquals(MethodType.methodType(void.class, String[].class), handle.type());
        String[] stringAry = new String[1];
        try {
            handle.invokeExact(stringAry);
            assertTrue("should not have reached here", false);
        } catch (BlahException re) {
        }
        assertEquals("foofinally", stringAry[0]);
    }

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                .invokeStatic(LOOKUP, BinderTest.class, "setZeroToFooAndRaise");


        assertEquals(MethodType.methodType(void.class, String[].class), handle.type());
        String[] stringAry = new String[1];
        try {
            handle.invokeExact(stringAry);
        } catch (BlahException re) {
            assertTrue("should not have reached here", false);
        }
        assertEquals("foofinally", stringAry[0]);
    }

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                .tryFinally(post)
                .invokeStatic(LOOKUP, BinderTest.class, "setZeroToFooReturnInt");


        assertEquals(MethodType.methodType(int.class, String[].class), handle.type());
        String[] stringAry = new String[1];
        assertEquals(1, (int)handle.invokeExact(stringAry));
        assertEquals("foofinally", stringAry[0]);
    }


    @Test
    public void testTryFinallyReturn2() throws Throwable {

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                .invokeStatic(LOOKUP, BinderTest.class, "setZeroToFooReturnIntAndRaise");


        assertEquals(MethodType.methodType(int.class, String[].class), handle.type());
        String[] stringAry = new String[1];
        try {
            int x = (int)handle.invokeExact(stringAry);
            assertTrue("should not have reached here", false);
        } catch (BlahException re) {
        }
        assertEquals("foofinally", stringAry[0]);
    }

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