java.lang.invoke.VarHandle源码实例Demo-ICode联盟

类java.lang.invoke.VarHandle源码实例Demo

下面列出了怎么用java.lang.invoke.VarHandle的API类实例代码及写法，或者点击链接到github查看源代码。

源代码1 项目： openjdk-jdk9 文件： VarHandleTestAccessShort.java

static void testInstanceFinalFieldUnsupported(VarHandleTestAccessShort recv, VarHandle vh) {
    checkUOE(() -> {
        vh.set(recv, (short)0x4567);
    });

    checkUOE(() -> {
        vh.setVolatile(recv, (short)0x4567);
    });

    checkUOE(() -> {
        vh.setRelease(recv, (short)0x4567);
    });

    checkUOE(() -> {
        vh.setOpaque(recv, (short)0x4567);
    });



}

源代码2 项目： openjdk-jdk9 文件： VarHandleTestAccessLong.java

static void testInstanceFinalFieldUnsupported(VarHandleTestAccessLong recv, VarHandle vh) {
    checkUOE(() -> {
        vh.set(recv, 0xCAFEBABECAFEBABEL);
    });

    checkUOE(() -> {
        vh.setVolatile(recv, 0xCAFEBABECAFEBABEL);
    });

    checkUOE(() -> {
        vh.setRelease(recv, 0xCAFEBABECAFEBABEL);
    });

    checkUOE(() -> {
        vh.setOpaque(recv, 0xCAFEBABECAFEBABEL);
    });



}

源代码3 项目： openjdk-jdk9 文件： VarHandleTestAccessLong.java

static void testStaticFinalFieldUnsupported(VarHandle vh) {
    checkUOE(() -> {
        vh.set(0xCAFEBABECAFEBABEL);
    });

    checkUOE(() -> {
        vh.setVolatile(0xCAFEBABECAFEBABEL);
    });

    checkUOE(() -> {
        vh.setRelease(0xCAFEBABECAFEBABEL);
    });

    checkUOE(() -> {
        vh.setOpaque(0xCAFEBABECAFEBABEL);
    });



}

源代码4 项目： Bytecoder 文件： ForkJoinPool.java

/**
 * Pushes a task. Call only by owner in unshared queues.
 *
 * @param task the task. Caller must ensure non-null.
 * @throws RejectedExecutionException if array cannot be resized
 */
final void push(ForkJoinTask<?> task) {
    ForkJoinTask<?>[] a;
    int s = top, d = s - base, cap, m;
    ForkJoinPool p = pool;
    if ((a = array) != null && (cap = a.length) > 0) {
        QA.setRelease(a, (m = cap - 1) & s, task);
        top = s + 1;
        if (d == m)
            growArray(false);
        else if (QA.getAcquire(a, m & (s - 1)) == null && p != null) {
            VarHandle.fullFence();  // was empty
            p.signalWork(null);
        }
    }
}

源代码5 项目： openjdk-jdk9 文件： VarHandleTestAccessChar.java

static void testStaticFinalFieldUnsupported(VarHandle vh) {
    checkUOE(() -> {
        vh.set('\u4567');
    });

    checkUOE(() -> {
        vh.setVolatile('\u4567');
    });

    checkUOE(() -> {
        vh.setRelease('\u4567');
    });

    checkUOE(() -> {
        vh.setOpaque('\u4567');
    });



}

源代码6 项目： openjdk-jdk9 文件： VarHandleTestAccessChar.java

static void testInstanceFinalFieldUnsupported(VarHandleTestAccessChar recv, VarHandle vh) {
    checkUOE(() -> {
        vh.set(recv, '\u4567');
    });

    checkUOE(() -> {
        vh.setVolatile(recv, '\u4567');
    });

    checkUOE(() -> {
        vh.setRelease(recv, '\u4567');
    });

    checkUOE(() -> {
        vh.setOpaque(recv, '\u4567');
    });



}

源代码7 项目： openjdk-jdk9 文件： ForkJoinPool.java

/**
 * Pushes a task. Call only by owner in unshared queues.
 *
 * @param task the task. Caller must ensure non-null.
 * @throws RejectedExecutionException if array cannot be resized
 */
final void push(ForkJoinTask<?> task) {
    int s = top; ForkJoinTask<?>[] a; int al, d;
    if ((a = array) != null && (al = a.length) > 0) {
        int index = (al - 1) & s;
        ForkJoinPool p = pool;
        top = s + 1;
        QA.setRelease(a, index, task);
        if ((d = base - s) == 0 && p != null) {
            VarHandle.fullFence();
            p.signalWork();
        }
        else if (d + al == 1)
            growArray();
    }
}

源代码8 项目： openjdk-jdk9 文件： VarHandleTestAccessInt.java

static void testInstanceFinalFieldUnsupported(VarHandleTestAccessInt recv, VarHandle vh) {
    checkUOE(() -> {
        vh.set(recv, 0x89ABCDEF);
    });

    checkUOE(() -> {
        vh.setVolatile(recv, 0x89ABCDEF);
    });

    checkUOE(() -> {
        vh.setRelease(recv, 0x89ABCDEF);
    });

    checkUOE(() -> {
        vh.setOpaque(recv, 0x89ABCDEF);
    });



}

源代码9 项目： openjdk-jdk9 文件： VarHandleTestAccessInt.java

static void testStaticFinalFieldUnsupported(VarHandle vh) {
    checkUOE(() -> {
        vh.set(0x89ABCDEF);
    });

    checkUOE(() -> {
        vh.setVolatile(0x89ABCDEF);
    });

    checkUOE(() -> {
        vh.setRelease(0x89ABCDEF);
    });

    checkUOE(() -> {
        vh.setOpaque(0x89ABCDEF);
    });



}

源代码10 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void start(long gen, String taskName, long nanoTime) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  STRINGS.setOpaque(taskNames, i, taskName);
  LONGS.setOpaque(nanoTimes, i, nanoTime);
  LONGS.setOpaque(genOps, i, gen + START_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码11 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void start(long gen, String taskName, String subTaskName, long nanoTime) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  STRINGS.setOpaque(taskNames, i, taskName);
  STRINGS.setOpaque(tagNames, i, subTaskName);
  LONGS.setOpaque(nanoTimes, i, nanoTime);
  LONGS.setOpaque(genOps, i, gen + START_S_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码12 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void link(long gen, long linkId) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  LONGS.setOpaque(tagIds, i, linkId);
  LONGS.setOpaque(genOps, i, gen + LINK_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码13 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void stop(long gen, String taskName, long nanoTime) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  STRINGS.setOpaque(taskNames, i, taskName);
  LONGS.setOpaque(nanoTimes, i, nanoTime);
  LONGS.setOpaque(genOps, i, gen + STOP_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码14 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void stop(long gen, String taskName, String subTaskName, long nanoTime) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  STRINGS.setOpaque(taskNames, i, taskName);
  STRINGS.setOpaque(tagNames, i, subTaskName);
  LONGS.setOpaque(nanoTimes, i, nanoTime);
  LONGS.setOpaque(genOps, i, gen + STOP_S_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码15 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void event(long gen, String eventName, long nanoTime) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  STRINGS.setOpaque(taskNames, i, eventName);
  LONGS.setOpaque(nanoTimes, i, nanoTime);
  LONGS.setOpaque(genOps, i, gen + EVENT_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码16 项目： openjdk-jdk9 文件： VarHandleTestAccessChar.java

@DataProvider
public Object[][] varHandlesProvider() throws Exception {
    List<VarHandle> vhs = new ArrayList<>();
    vhs.add(vhField);
    vhs.add(vhStaticField);
    vhs.add(vhArray);

    return vhs.stream().map(tc -> new Object[]{tc}).toArray(Object[][]::new);
}

源代码17 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void attachTag(long gen, String tagName, long tagId) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  STRINGS.setOpaque(tagNames, i, tagName);
  LONGS.setOpaque(tagIds, i, tagId);
  LONGS.setOpaque(genOps, i, gen + ATTACH_T_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码18 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void attachKeyedTag(long gen, String name, long value0, long value1) {
  long localIdx = (long) IDX.get(this);
  int i = (int) (localIdx & maxEventsMax);
  STRINGS.setOpaque(tagNames, i, name);
  LONGS.setOpaque(tagIds, i, value0);
  LONGS.setOpaque(nanoTimes, i, value1);
  LONGS.setOpaque(genOps, i, gen + ATTACH_SNN_OP);
  IDX.setRelease(this, localIdx + 1);
  VarHandle.storeStoreFence();
}

源代码19 项目： perfmark 文件： VarHandleMarkHolder.java

@Override
public void resetForTest() {
  Arrays.fill(taskNames, null);
  Arrays.fill(markers, null);
  Arrays.fill(tagNames, null);
  Arrays.fill(tagIds, 0);
  Arrays.fill(nanoTimes, 0);
  Arrays.fill(genOps, 0);
  IDX.setRelease(this, 0L);
  VarHandle.storeStoreFence();
}

源代码20 项目： openjdk-jdk9 文件： VarHandleTestAccessLong.java

@Test(dataProvider = "typesProvider")
public void testTypes(VarHandle vh, List<Class<?>> pts) {
    assertEquals(vh.varType(), long.class);

    assertEquals(vh.coordinateTypes(), pts);

    testTypes(vh);
}

源代码21 项目： openjdk-jdk9 文件： VarHandleTestAccessChar.java

@Test(dataProvider = "typesProvider")
public void testTypes(VarHandle vh, List<Class<?>> pts) {
    assertEquals(vh.varType(), char.class);

    assertEquals(vh.coordinateTypes(), pts);

    testTypes(vh);
}

源代码22 项目： java-katas 文件： TestSolutionGetter.java

@Test
@Tag("PASSING")
@Order(4)
public void getPrivateVariableFromConstructedClassViaVarHandles() {

    try {

        /*
         * DONE:
         *  Replace the "null"s with valid values to get a VarHandle.
         *  Check API: java.lang.invoke.MethodHandles.privateLookupIn(?, ?)
         *             HINT: params are Target class and type of lookup
         *  Check API: java.lang.invoke.MethodHandles.Lookup.findVarHandle(?, ?, ?)
         *             HINT: params are Declaring class, Variable name, Variable type
         */
        VarHandle privateVariableVarHandle = MethodHandles
                .privateLookupIn(TestSolutionGetter.class, MethodHandles.lookup())
                .findVarHandle(TestSolutionGetter.class, "privateVariable", Integer.class);

        assertEquals(1,
                privateVariableVarHandle.coordinateTypes().size(),
                "There should only be one coordinateType");

        assertEquals(TestSolutionGetter.class,
                privateVariableVarHandle.coordinateTypes().get(0),
                "The only coordinate type is AttributeGetterTest");

        assertTrue(privateVariableVarHandle.isAccessModeSupported(VarHandle.AccessMode.GET),
                "Access mode for a GET should be true");

        assertEquals(2,
                privateVariableVarHandle.get(this),
                "The value of the field should be 2");

    } catch (NoSuchFieldException | IllegalAccessException | NullPointerException e) {

        fail(TEST_FAILURE.getValue() + e.getMessage());

    }
}

源代码23 项目： openjdk-jdk9 文件： VarHandleTestReflection.java

@Test(dataProvider = "accessModesProvider", expectedExceptions = IllegalArgumentException.class)
public void reflectAsFromFindVirtual(VarHandle.AccessMode accessMode) throws Exception {
    VarHandle v = handle();

    MethodHandle mh = MethodHandles.publicLookup().findVirtual(
            VarHandle.class, accessMode.methodName(), v.accessModeType(accessMode));

    MethodHandleInfo info = MethodHandles.lookup().revealDirect(mh);

    info.reflectAs(Method.class, MethodHandles.lookup());
}

源代码24 项目： openjdk-jdk9 文件： VarHandleTestAccessFloat.java

@Test(dataProvider = "typesProvider")
public void testTypes(VarHandle vh, List<Class<?>> pts) {
    assertEquals(vh.varType(), float.class);

    assertEquals(vh.coordinateTypes(), pts);

    testTypes(vh);
}

源代码25 项目： openjdk-jdk9 文件： VarHandleTestByteArrayAsShort.java

@Test(dataProvider = "varHandlesProvider")
public void testIsAccessModeSupported(VarHandleSource vhs) {
    VarHandle vh = vhs.s;

    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET));

    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_VOLATILE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET_VOLATILE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_ACQUIRE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET_RELEASE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_OPAQUE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET_OPAQUE));

    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_SET));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_EXCHANGE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_EXCHANGE_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_EXCHANGE_RELEASE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_PLAIN));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_RELEASE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_SET));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_SET_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_SET_RELEASE));

    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_ADD));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_ADD_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_ADD_RELEASE));

    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_OR));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_OR_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_OR_RELEASE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_AND));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_AND_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_AND_RELEASE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_XOR));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_XOR_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_XOR_RELEASE));
}

源代码26 项目： openjdk-jdk9 文件： VarHandleTestByteArrayAsFloat.java

@Test(dataProvider = "varHandlesProvider")
public void testIsAccessModeSupported(VarHandleSource vhs) {
    VarHandle vh = vhs.s;

    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET));

    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_VOLATILE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET_VOLATILE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_ACQUIRE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET_RELEASE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_OPAQUE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.SET_OPAQUE));

    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_SET));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_EXCHANGE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_EXCHANGE_ACQUIRE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.COMPARE_AND_EXCHANGE_RELEASE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_PLAIN));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_ACQUIRE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.WEAK_COMPARE_AND_SET_RELEASE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_SET));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_SET_ACQUIRE));
    assertTrue(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_SET_RELEASE));

    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_ADD));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_ADD_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_ADD_RELEASE));

    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_OR));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_OR_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_OR_RELEASE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_AND));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_AND_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_AND_RELEASE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_XOR));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_XOR_ACQUIRE));
    assertFalse(vh.isAccessModeSupported(VarHandle.AccessMode.GET_AND_BITWISE_XOR_RELEASE));
}

源代码27 项目： java-katas 文件： TestKataGetter.java

@Test
@Tag("TODO")
@Order(4)
public void getPrivateVariableFromConstructedClassViaVarHandles() {

    try {

        /*
         * TODO:
         *  Replace the "null"s with valid values to get a VarHandle.
         *  Check API: java.lang.invoke.MethodHandles.privateLookupIn(?, ?)
         *             HINT: params are Target class and type of lookup
         *  Check API: java.lang.invoke.MethodHandles.Lookup.findVarHandle(?, ?, ?)
         *             HINT: params are Declaring class, Variable name, Variable type
         */
        VarHandle privateVariableVarHandle = MethodHandles
                .privateLookupIn(null, MethodHandles.lookup())
                .findVarHandle(null, null, null);

        assertEquals(1,
                privateVariableVarHandle.coordinateTypes().size(),
                "There should only be one coordinateType");

        assertEquals(TestKataGetter.class,
                privateVariableVarHandle.coordinateTypes().get(0),
                "The only coordinate type is AttributeGetterTest");

        assertTrue(privateVariableVarHandle.isAccessModeSupported(VarHandle.AccessMode.GET),
                "Access mode for a GET should be true");

        assertEquals(2,
                privateVariableVarHandle.get(this),
                "The value of the field should be 2");

    } catch (NoSuchFieldException | IllegalAccessException | NullPointerException e) {

        fail(TEST_FAILURE.getValue() + e.getMessage());

    }
}

源代码28 项目： openjdk-jdk9 文件： VarHandleTestByteArrayAsFloat.java

@Test(dataProvider = "typesProvider")
public void testTypes(VarHandle vh, List<java.lang.Class<?>> pts) {
    assertEquals(vh.varType(), float.class);

    assertEquals(vh.coordinateTypes(), pts);

    testTypes(vh);
}

源代码29 项目： Bytecoder 文件： SubmissionPublisher.java

/**
 * Tries to expand buffer and add item, returning true on
 * success. Currently fails only if out of memory.
 */
final boolean growAndOffer(T item, Object[] a, int t) {
    int cap = 0, newCap = 0;
    Object[] newArray = null;
    if (a != null && (cap = a.length) > 0 && (newCap = cap << 1) > 0) {
        try {
            newArray = new Object[newCap];
        } catch (OutOfMemoryError ex) {
        }
    }
    if (newArray == null)
        return false;
    else {                                // take and move items
        int newMask = newCap - 1;
        newArray[t-- & newMask] = item;
        for (int mask = cap - 1, k = mask; k >= 0; --k) {
            Object x = QA.getAndSet(a, t & mask, null);
            if (x == null)
                break;                    // already consumed
            else
                newArray[t-- & newMask] = x;
        }
        array = newArray;
        VarHandle.releaseFence();         // release array and slots
        return true;
    }
}

源代码30 项目： openjdk-jdk9 文件： VarHandleTestReflection.java

@Test(dataProvider = "accessModesProvider", expectedExceptions = UnsupportedOperationException.class)
public void methodHandleInvoke(VarHandle.AccessMode accessMode) throws Throwable {
    VarHandle v = handle();

    // Try a reflective invoke using a MethodHandle

    MethodHandle mh = MethodHandles.lookup().unreflect(
            VarHandle.class.getMethod(accessMode.methodName(), Object[].class));
    // Use invoke to avoid WrongMethodTypeException for
    // non-signature-polymorphic return types
    Object o = (Object) mh.invoke(v, new Object[]{});
}

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