JavaFXSafeProxy.java
- /*
- * #%L
- * *********************************************************************************************************************
- *
- * SteelBlue
- * http://steelblue.tidalwave.it - git clone git@bitbucket.org:tidalwave/steelblue-src.git
- * %%
- * Copyright (C) 2015 - 2015 Tidalwave s.a.s. (http://tidalwave.it)
- * %%
- *
- * *********************************************************************************************************************
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
- * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
- * specific language governing permissions and limitations under the License.
- *
- * *********************************************************************************************************************
- *
- *
- *
- * *********************************************************************************************************************
- * #L%
- */
- package it.tidalwave.role.ui.javafx.impl.util;
- import javax.annotation.Nonnull;
- import java.lang.reflect.InvocationHandler;
- import java.lang.reflect.Method;
- import java.util.concurrent.CountDownLatch;
- import java.util.concurrent.atomic.AtomicReference;
- import lombok.Getter;
- import lombok.RequiredArgsConstructor;
- import lombok.Setter;
- import lombok.extern.slf4j.Slf4j;
- /***********************************************************************************************************************
- *
- * An {@link InvocationHandler} that safely wraps all method calls with {@link #Platform.runLater(Runnable)}. The caller
- * is not blocked if the method is declared as {@code void}; it is blocked otherwise, so it can immediately retrieve
- * the result.
- *
- * This behaviour is required by {@link JavaFXSafeProxyCreator.#createNodeAndDelegate()}.
- *
- * TODO: add support for aysnc returning a Future.
- *
- * @author Fabrizio Giudici
- *
- **********************************************************************************************************************/
- @RequiredArgsConstructor @Slf4j
- public class JavaFXSafeProxy<T> implements InvocationHandler
- {
- @Nonnull @Getter @Setter
- private T delegate;
- @Override
- public Object invoke (@Nonnull final Object proxy, @Nonnull final Method method, @Nonnull final Object[] args)
- throws Throwable
- {
- final AtomicReference<Object> result = new AtomicReference<>();
- final AtomicReference<Throwable> throwable = new AtomicReference<>();
- final CountDownLatch waitForReturn = new CountDownLatch(1);
- JavaFXSafeRunner.runSafely(() ->
- {
- try
- {
- log.trace(">>>> safely invoking {}", method);
- result.set(method.invoke(delegate, args));
- }
- catch (Throwable t)
- {
- throwable.set(t);
- log.warn("Exception while calling JavaFX", t);
- }
- finally
- {
- waitForReturn.countDown();
- }
- });
- if (method.getReturnType().equals(void.class))
- {
- return null;
- }
- log.trace(">>>> waiting for method completion");
- waitForReturn.await();
- // This is probably useless - void methods return asynchronously
- if (throwable.get() != null)
- {
- throw throwable.get();
- }
- return result.get();
- }
- }