groovy/gradle/src/org/netbeans/modules/gradle/GradleDaemon.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.netbeans.modules.gradle;

import org.netbeans.modules.gradle.api.NbGradleProject;
import org.netbeans.modules.gradle.api.execute.GradleCommandLine;
import org.netbeans.modules.gradle.spi.GradleSettings;
import java.io.File;
import org.gradle.tooling.BuildAction;
import org.gradle.tooling.BuildActionExecuter;
import org.gradle.tooling.BuildController;
import org.gradle.tooling.GradleConnectionException;
import org.gradle.tooling.GradleConnector;
import org.gradle.tooling.ProjectConnection;
import org.openide.modules.InstalledFileLocator;
import org.openide.modules.OnStart;
import org.openide.util.RequestProcessor;

/**
 *
 * @author Laszlo Kishalmi
 */
public final class GradleDaemon {

    static final RequestProcessor GRADLE_LOADER_RP = new RequestProcessor("gradle-project-loader", 1); //NOI18N
    static final String INIT_SCRIPT_NAME = "modules/gradle/nb-tooling.gradle"; //NOI18N
    static final String TOOLING_JAR_NAME = "modules/gradle/netbeans-gradle-tooling.jar"; //NOI18N

    public static final String PROP_TOOLING_JAR = "NETBEANS_TOOLING_JAR";
    public static final String INIT_SCRIPT = InstalledFileLocator.getDefault().locate(INIT_SCRIPT_NAME, NbGradleProject.CODENAME_BASE, false).getAbsolutePath();
    public static final String TOOLING_JAR = InstalledFileLocator.getDefault().locate(TOOLING_JAR_NAME, NbGradleProject.CODENAME_BASE, false).getAbsolutePath();

    private static final String DAEMON_LOADED = "Daemon Loaded."; //NOI18N
    private static final String LOADER_PROJECT_NAME = "modules/gradle/daemon-loader"; //NOI18N
    private static final File LOADER_PROJECT_DIR = InstalledFileLocator.getDefault().locate(LOADER_PROJECT_NAME, NbGradleProject.CODENAME_BASE, false);
    private static final DummyBuildAction DUMMY_ACTION = new DummyBuildAction();

    private GradleDaemon() {}

    @OnStart
    public static class Loader implements Runnable {

        @Override
        public void run() {
            GradleSettings settings = GradleSettings.getDefault();
            GradleDistributionManager dmgr = GradleDistributionManager.get(settings.getGradleUserHome());
            if ( settings.isStartDaemonOnStart()
                    && dmgr.defaultToolingVersion().isAvailable()) {
                GRADLE_LOADER_RP.submit(GradleDaemon::doLoadDaemon);
            }
        }
    }

    private static void doLoadDaemon() {
        GradleConnector gconn = GradleConnector.newConnector();
        ProjectConnection pconn = gconn.forProjectDirectory(LOADER_PROJECT_DIR).connect();
        BuildActionExecuter<String> action = pconn.action(DUMMY_ACTION);
        GradleCommandLine cmd = new GradleCommandLine();
        cmd.addSystemProperty(PROP_TOOLING_JAR, TOOLING_JAR);
        cmd.setFlag(GradleCommandLine.Flag.OFFLINE, true);
        cmd.addParameter(GradleCommandLine.Parameter.INIT_SCRIPT, INIT_SCRIPT);
        cmd.configure(action);
        try {
            action.run();
        } catch (GradleConnectionException | IllegalStateException ex) {
            // Well for some reason we were  not able to load Gradle.
            // Ignoring that for now
        } finally {
            pconn.close();
        }
    }

    private static class DummyBuildAction implements BuildAction<String> {

        @Override
        public String execute(BuildController bc) {
            return DAEMON_LOADED;
        }

    }

}