org.eclim.installer.ant.ShutdownTask.java Source code

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Here is the source code for org.eclim.installer.ant.ShutdownTask.java

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/**
 * Copyright (C) 2005 - 2013  Eric Van Dewoestine
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.eclim.installer.ant;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;

import java.net.Socket;

import java.util.Iterator;

import org.apache.commons.io.IOUtils;

import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;

import com.google.gson.Gson;

/**
 * Task for shutting down eclimd.
 *
 * @author Eric Van Dewoestine
 */
public class ShutdownTask extends Task {
    private static final long WAIT_TIME = 3000;

    /**
     * Executes this task.
     */
    @SuppressWarnings("unchecked")
    public void execute() throws BuildException {
        Gson gson = new Gson();
        FileReader reader = null;
        try {
            File instances = new File(System.getProperty("user.home") + "/.eclim/.eclimd_instances");
            int count = 0;
            if (instances.exists()) {
                reader = new FileReader(instances);
                for (Iterator<String> ii = IOUtils.lineIterator(reader); ii.hasNext();) {
                    count++;

                    String line = ii.next();
                    String name = null;
                    int port = 9091;

                    if (line.startsWith("{")) {
                        Instance instance = gson.fromJson(line, Instance.class);
                        name = instance.workspace + ':' + instance.port;
                        port = instance.port;
                    } else {
                        name = line;
                        port = Integer.parseInt(line.replaceFirst(".*:", ""));
                    }

                    try {
                        log("Shutting down eclimd: " + name);
                        shutdown(port);
                    } catch (Exception e) {
                        log("Unable to shut down eclimd (" + name + "): " + e.getClass().getName() + " - "
                                + e.getMessage());
                    }
                }
            }

            // if no registered instances found, try shutting down the default port to
            // account for users on old eclim versions
            if (count == 0) {
                try {
                    shutdown(9091);
                } catch (Exception e) {
                    log("Unable to shut down eclimd (9091): " + e.getClass().getName() + " - " + e.getMessage());
                }
            }
        } catch (FileNotFoundException fnfe) {
            log("Unable to locate eclimd instances file.");
        } finally {
            IOUtils.closeQuietly(reader);
        }
    }

    private void shutdown(int port) throws Exception {
        Socket socket = null;
        try {
            socket = new Socket("localhost", port);
            OutputStream out = socket.getOutputStream();
            out.write(nailgunPacket('A', "-command"));
            out.write(nailgunPacket('A', "shutdown"));
            out.write(nailgunPacket('C', "org.eclim.command.Main"));
            out.flush();
            Thread.sleep(WAIT_TIME);
        } finally {
            try {
                socket.close();
            } catch (IOException ioe) {
                // ignore
            }
        }
    }

    private byte[] nailgunPacket(char type, String value) {
        int length = value.length();

        byte[] packet = new byte[5 + length];
        packet[0] = (byte) ((length >> 24) & 0xff);
        packet[1] = (byte) ((length >> 16) & 0xff);
        packet[2] = (byte) ((length >> 8) & 0xff);
        packet[3] = (byte) (length & 0xff);
        packet[4] = (byte) type;
        System.arraycopy(value.getBytes(), 0, packet, 5, length);
        return packet;
    }

    @SuppressWarnings("unused")
    private class Instance {
        public String home;
        public String workspace;
        public int port;
    }
}