/*

 * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package nsk.share;

import nsk.share.*;

import java.io.*;

/**

 * Wrapper for local process.

 * <p>

 * This class provides abilities to launch such process,

 * redirect standard output streams, wait for process terminates

 * or kill the process, and so on.

 * <p>

 * This object is finalized with <code>nsk.share.Finalizer</code>.

 *

 * @see nsk.share.FinalizableObject

 * @see nsk.share.Finalizer

 */

public class LocalProcess extends FinalizableObject {

    public final static int PROCESS_IS_ALIVE = 222;

    private Process process;

    protected Process getProcess() {

        return process;

    }

    public void launch (String[] args) throws IOException {

        System.out.println("Launching process by array of args: ");

        for (int mm=0; mm < args.length; mm++) {

            System.out.println("    args[" + Integer.toString(mm) + "]: >" +

                               args[mm] + "<");

        }

        process = Runtime.getRuntime().exec(args);

        Finalizer finalizer = new Finalizer(this);

        finalizer.activate();

    }

    public void launch (String cmdLine) throws IOException {

        System.out.println("Launching process by command line: " + cmdLine);

        process = Runtime.getRuntime().exec(cmdLine);

        Finalizer finalizer = new Finalizer(this);

        finalizer.activate();

    }

    /** Return exit status. */

    public int getStatus () {

        return process.exitValue();

    }

    /** Check whether the process has been terminated. */

    public boolean terminated() {

        try {

            int value = process.exitValue();

            return true;

        } catch (IllegalThreadStateException e) {

            return false;

        }

    }

    /** Wait until the process shutdown or crash. */

    public int waitFor () throws InterruptedException {

        return process.waitFor();

    }

    /**

     * Wait until the process shutdown or crash for given timeout in milliseconds.

     * Returns <code>LocalProcess.PROCESS_IS_ALIVE</code> if process is not terminated

     * after timeout.

     */

    public int waitFor (long timeMillisec) throws InterruptedException {

        final Object waitObject = new Object();

        class Watcher extends Thread {

            int exitCode = LocalProcess.PROCESS_IS_ALIVE;

            Process process;

            Watcher (Process process) {

               this.process = process;

            }

            public void run () {

                try {

                    synchronized (this) {

                       exitCode = process.waitFor();

                    }

                } catch (InterruptedException ie) {

                }

                synchronized (waitObject) {

                    waitObject.notifyAll();

                }

            }

            synchronized public int getExitCode() {

                return exitCode;

            }

        }

        Watcher watcher;

        // yield control to watcher for timeMillisec time.

        synchronized (waitObject) {

            watcher = new Watcher(process);

            watcher.start();

            waitObject.wait(timeMillisec);

        }

        if (watcher.isAlive()) {

            watcher.interrupt();

        }

        return watcher.getExitCode();

    }

    // --------------------------------------------------- //

    /** Get a pipe to write to the process' stdin stream. */

    public OutputStream getStdin () {

        return process.getOutputStream();

    }

    /** Get a pipe to read the process' stdout stream. */

    public InputStream getStdout () {

        return process.getInputStream();

    }

    /** Get a pipe to read the process stderr stream. */

    public InputStream getStderr () {

        return process.getErrorStream();

    }

    /** Kill the process. */

    protected void kill() {

        process.destroy();

    }

    /**

     * Finalize mirror by invoking <code>close()</code>.

     *

     * @throws Throwable if any throwable exception is thrown during finalization

     */

    protected void finalize() throws Throwable {

        kill();

        super.finalize();

    }

}