net.minecraftforge.gradle.userdev.tasks.HackyJavaCompile Maven / Gradle / Ivy

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/*
 * ForgeGradle
 * Copyright (C) 2018 Forge Development LLC
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

package net.minecraftforge.gradle.userdev.tasks;

import org.gradle.api.internal.tasks.compile.DefaultJavaCompileSpec;
import org.gradle.api.internal.tasks.compile.JavaCompileSpec;
import org.gradle.api.provider.Provider;
import org.gradle.api.tasks.WorkResult;
import org.gradle.api.tasks.compile.JavaCompile;
import org.gradle.jvm.toolchain.JavaCompiler;
import org.gradle.jvm.toolchain.JavaLanguageVersion;
import org.gradle.jvm.toolchain.JavaToolchainService;
import org.gradle.language.base.internal.compile.Compiler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/*
 *  A terrible hack to use JavaCompile while bypassing
 *  Gradle's normal task infrastructure.
 *  This is internal API Modders DO NOT reference this.
 *  It can and will be removed if we get a better way to do this.
 */
public class HackyJavaCompile extends JavaCompile {

    public void doHackyCompile() {

        // What follows is a horrible hack to allow us to call JavaCompile
        // from our dependency resolver.
        // As described in https://github.com/MinecraftForge/ForgeGradle/issues/550,
        // invoking Gradle tasks in the normal way can lead to deadlocks
        // when done from a dependency resolver.

        setCompiler();

        this.getOutputs().setPreviousOutputFiles(this.getProject().files());
        final DefaultJavaCompileSpec spec = reflectCreateSpec();
        spec.setSourceFiles(getSource());
        Compiler compiler = createCompiler(spec);
        final WorkResult execute = compiler.execute(spec);
        setDidWork(execute.getDidWork());
    }

    private void setCompiler() {
        JavaToolchainService service = getProject().getExtensions().getByType(JavaToolchainService.class);
        Provider compiler = service.compilerFor(s -> s.getLanguageVersion().set(JavaLanguageVersion.of(this.getSourceCompatibility())));
        this.getJavaCompiler().set(compiler);
    }

    private DefaultJavaCompileSpec reflectCreateSpec() {
        try {
            Method createSpec = JavaCompile.class.getDeclaredMethod("createSpec");
            createSpec.setAccessible(true);
            return (DefaultJavaCompileSpec) createSpec.invoke(this);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("Could not find JavaCompile#createSpec method; might be on incompatible newer version of Gradle", e);
        } catch (IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException("Exception while invoking JavaCompile#createSpec", e);
        }
    }

    @SuppressWarnings("unchecked")
    private Compiler createCompiler(JavaCompileSpec spec) {
        try {
            Method createCompiler = JavaCompile.class.getDeclaredMethod("createCompiler");
            createCompiler.setAccessible(true);
            return (Compiler) createCompiler.invoke(this);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException("Could not find JavaCompile#createCompiler method; might be on incompatible newer version of Gradle", e);
        } catch (IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException("Exception while invoking JavaCompile#createCompiler", e);
        }
    }

}