<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/><link rel="stylesheet" href="../../jacoco-resources/report.css" type="text/css"/><link rel="shortcut icon" href="../../jacoco-resources/report.gif" type="image/gif"/><title>JavaFXSafeProxy.java</title><link rel="stylesheet" href="../../jacoco-resources/prettify.css" type="text/css"/><script type="text/javascript" src="../../jacoco-resources/prettify.js"></script></head><body onload="window['PR_TAB_WIDTH']=4;prettyPrint()"><div class="breadcrumb" id="breadcrumb"><span class="info"><a href="../../jacoco-sessions.html" class="el_session">Sessions</a></span><a href="../../index.html" class="el_report">SteelBlue - Examples - Large</a> > <a href="../index.html" class="el_bundle">it-tidalwave-role-ui-javafx</a> > <a href="index.source.html" class="el_package">it.tidalwave.role.ui.javafx.impl.util</a> > <span class="el_source">JavaFXSafeProxy.java</span></div><h1>JavaFXSafeProxy.java</h1><pre class="source lang-java linenums">/*
* *********************************************************************************************************************
*
* SteelBlue: DCI User Interfaces
* http://tidalwave.it/projects/steelblue
*
* Copyright (C) 2015 - 2021 by 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.
*
* *********************************************************************************************************************
*
* git clone https://bitbucket.org/tidalwave/steelblue-src
* git clone https://github.com/tidalwave-it/steelblue-src
*
* *********************************************************************************************************************
*/
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.
add support for aysnc returning a Future.
*
* @author Fabrizio Giudici
*
**********************************************************************************************************************/
<span class="nc bnc" id="L52" title="All 2 branches missed.">@RequiredArgsConstructor @Slf4j</span>
public class JavaFXSafeProxy<T> implements InvocationHandler
{
<span class="nc bnc" id="L55" title="All 2 branches missed."> @Nonnull @Getter @Setter</span>
private T delegate;
@Override
public Object invoke (@Nonnull final Object proxy, @Nonnull final Method method, @Nonnull final Object[] args)
throws Throwable
{
<span class="nc" id="L62"> final AtomicReference<Object> result = new AtomicReference<>();</span>
<span class="nc" id="L63"> final AtomicReference<Throwable> throwable = new AtomicReference<>();</span>
<span class="nc" id="L64"> final CountDownLatch waitForReturn = new CountDownLatch(1);</span>
<span class="nc" id="L66"> JavaFXSafeRunner.runSafely(() -></span>
{
try
{
<span class="nc" id="L70"> log.trace(">>>> safely invoking {}", method);</span>
<span class="nc" id="L71"> result.set(method.invoke(delegate, args));</span>
}
<span class="nc" id="L73"> catch (Throwable t)</span>
{
<span class="nc" id="L75"> throwable.set(t);</span>
<span class="nc" id="L76"> log.warn("Exception while calling JavaFX", t);</span>
}
finally
{
<span class="nc" id="L80"> waitForReturn.countDown();</span>
}
<span class="nc" id="L82"> });</span>
<span class="nc bnc" id="L84" title="All 2 branches missed."> if (method.getReturnType().equals(void.class))</span>
{
<span class="nc" id="L86"> return null;</span>
}
<span class="nc" id="L89"> log.trace(">>>> waiting for method completion");</span>
<span class="nc" id="L90"> waitForReturn.await();</span>
// This is probably useless - void methods return asynchronously
<span class="nc bnc" id="L93" title="All 2 branches missed."> if (throwable.get() != null)</span>
{
<span class="nc" id="L95"> throw throwable.get();</span>
}
<span class="nc" id="L98"> return result.get();</span>
}
}
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