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editor/src/main/com/mbrlabs/mundus/editor/utils/StartOnFirstThreadHelper.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| /* | ||
| * Copyright 2020 damios | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| package com.mbrlabs.mundus.editor.utils; | ||
|
|
||
| import com.badlogic.gdx.scenes.scene2d.utils.UIUtils; | ||
| import org.lwjgl.system.macosx.LibC; | ||
|
|
||
| import java.io.BufferedReader; | ||
| import java.io.File; | ||
| import java.io.InputStreamReader; | ||
| import java.lang.management.ManagementFactory; | ||
| import java.util.ArrayList; | ||
|
|
||
| /** | ||
| * Adds some utilities to ensure that the JVM was started with the | ||
| * {@code -XstartOnFirstThread} argument, which is required on macOS for LWJGL 3 | ||
| * to function. | ||
| * | ||
| * @author damios | ||
| * @see <a href= | ||
| * "http://www.java-gaming.org/topics/starting-jvm-on-mac-with-xstartonfirstthread-programmatically/37697/view.html">Based | ||
| * on http://www.java-gaming.org/topics/-/37697/view.html</a> | ||
| * | ||
| */ | ||
| public class StartOnFirstThreadHelper { | ||
|
|
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| private static final String JVM_RESTARTED_ARG = "jvmIsRestarted"; | ||
|
|
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| private StartOnFirstThreadHelper() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
|
||
| /** | ||
| * Starts a new JVM if the application was started on macOS without the | ||
| * {@code -XstartOnFirstThread} argument. Returns whether a new JVM was started | ||
| * and thus no code should be executed. | ||
| * <p> | ||
| * <u>Usage:</u> | ||
| * | ||
| * <pre> | ||
| * public static void main(String... args) { | ||
| * if (StartOnFirstThreadHelper.startNewJvmIfRequired()) { | ||
| * return; // don't execute any code | ||
| * } | ||
| * // the actual main method code | ||
| * } | ||
| * </pre> | ||
| * | ||
| * @param redirectOutput whether the output of the new JVM should be rerouted to | ||
| * the new JVM, so it can be accessed in the same place; | ||
| * keeps the old JVM running if enabled | ||
| * @return whether a new JVM was started and thus no code should be executed in | ||
| * this one | ||
| */ | ||
| public static boolean startNewJvmIfRequired(boolean redirectOutput) { | ||
| if (!UIUtils.isMac) { | ||
| return false; | ||
| } | ||
|
|
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| long pid = LibC.getpid(); | ||
|
|
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| // check whether -XstartOnFirstThread is enabled | ||
| if ("1".equals(System.getenv("JAVA_STARTED_ON_FIRST_THREAD_" + pid))) { | ||
| return false; | ||
| } | ||
|
|
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| // check whether the JVM was previously restarted | ||
| // avoids looping, but most certainly leads to a crash | ||
| if ("true".equals(System.getProperty(JVM_RESTARTED_ARG))) { | ||
| System.err.println( | ||
| "There was a problem evaluating whether the JVM was started with the -XstartOnFirstThread argument."); | ||
| return false; | ||
| } | ||
|
|
||
| // Restart the JVM with -XstartOnFirstThread | ||
| ArrayList<String> jvmArgs = new ArrayList<String>(); | ||
| String separator = System.getProperty("file.separator"); | ||
| // TODO Java 9: ProcessHandle.current().info().command(); | ||
| String javaExecPath = System.getProperty("java.home") + separator + "bin" + separator + "java"; | ||
| if (!(new File(javaExecPath)).exists()) { | ||
| System.err.println( | ||
| "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the -XstartOnFirstThread argument manually!"); | ||
| return false; | ||
| } | ||
| jvmArgs.add(javaExecPath); | ||
| jvmArgs.add("-XstartOnFirstThread"); | ||
| jvmArgs.add("-D" + JVM_RESTARTED_ARG + "=true"); | ||
| jvmArgs.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments()); | ||
| jvmArgs.add("-cp"); | ||
| jvmArgs.add(System.getProperty("java.class.path")); | ||
| jvmArgs.add(System.getenv("JAVA_MAIN_CLASS_" + pid)); | ||
|
|
||
| try { | ||
| if (!redirectOutput) { | ||
| ProcessBuilder processBuilder = new ProcessBuilder(jvmArgs); | ||
| processBuilder.start(); | ||
| } else { | ||
| Process process = (new ProcessBuilder(jvmArgs)).redirectErrorStream(true).start(); | ||
| BufferedReader processOutput = new BufferedReader(new InputStreamReader(process.getInputStream())); | ||
| String line; | ||
|
|
||
| while ((line = processOutput.readLine()) != null) { | ||
| System.out.println(line); | ||
| } | ||
|
|
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| process.waitFor(); | ||
| } | ||
| } catch (Exception e) { | ||
| System.err.println("There was a problem restarting the JVM"); | ||
| e.printStackTrace(); | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| /** | ||
| * Starts a new JVM if the application was started on macOS without the | ||
| * {@code -XstartOnFirstThread} argument. Returns whether a new JVM was started | ||
| * and thus no code should be executed. Redirects the output of the new JVM to | ||
| * the old one. | ||
| * <p> | ||
| * <u>Usage:</u> | ||
| * | ||
| * <pre> | ||
| * public static void main(String... args) { | ||
| * if (StartOnFirstThreadHelper.startNewJvmIfRequired()) { | ||
| * return; // don't execute any code | ||
| * } | ||
| * // the actual main method code | ||
| * } | ||
| * </pre> | ||
| * | ||
| * @return whether a new JVM was started and thus no code should be executed in | ||
| * this one | ||
| */ | ||
| public static boolean startNewJvmIfRequired() { | ||
| return startNewJvmIfRequired(true); | ||
| } | ||
|
|
||
| /** | ||
| * Starts a new JVM if required; otherwise executes the main method code given | ||
| * as Runnable. When used with lambdas, this is allows for less verbose code | ||
| * than {@link #startNewJvmIfRequired()}: | ||
| * | ||
| * <pre> | ||
| * public static void main(String... args) { | ||
| * StartOnFirstThreadHelper.executeIfJVMValid(() -> { | ||
| * // the actual main method code | ||
| * }); | ||
| * } | ||
| * </pre> | ||
| * | ||
| * @param mainMethodCode | ||
| */ | ||
| public static void executeIfJVMValid(Runnable mainMethodCode) { | ||
| if (startNewJvmIfRequired()) { | ||
| return; | ||
| } | ||
| mainMethodCode.run(); | ||
| } | ||
|
|
||
| } |
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