001/*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020package org.crsh.shell.impl.async;
021
022import org.crsh.cli.impl.completion.CompletionMatch;
023import org.crsh.shell.Shell;
024
025import java.io.Closeable;
026import java.util.Collections;
027import java.util.HashSet;
028import java.util.Set;
029import java.util.concurrent.ExecutorService;
030
031public class AsyncShell implements Shell, Closeable {
032
033  /** . */
034  final Shell shell;
035
036  /** . */
037  private AsyncProcess current;
038
039  /** . */
040  final ExecutorService executor;
041
042  /** . */
043  boolean closed;
044
045  /** . */
046  final Object lock = new Object();
047
048  /** . */
049  final Set<AsyncProcess> processes;
050
051  public AsyncShell(ExecutorService executor, Shell shell) {
052    this.shell = shell;
053    this.current = null;
054    this.executor = executor;
055    this.closed = false;
056    this.processes = Collections.synchronizedSet(new HashSet<AsyncProcess>());
057  }
058
059  public void close() {
060
061    AsyncProcess[] toCancel = null;
062    synchronized (lock) {
063      if (closed) {
064        toCancel = null;
065      } else {
066        closed = true;
067        toCancel = processes.toArray(new AsyncProcess[processes.size()]);
068      }
069    }
070
071    // Cancel all process
072    if (toCancel != null) {
073      for (AsyncProcess process : toCancel) {
074        process.cancel();
075      }
076    }
077  }
078
079  // Shell implementation **********************************************************************************************
080
081  public String getWelcome() {
082    return shell.getWelcome();
083  }
084
085  public String getPrompt() {
086    return shell.getPrompt();
087  }
088
089  public CompletionMatch complete(String prefix) {
090    return shell.complete(prefix);
091  }
092
093  public AsyncProcess createProcess(String request) {
094    synchronized (lock) {
095      if (closed) {
096        throw new IllegalStateException();
097      }
098    }
099    return new AsyncProcess(this, request);
100  }
101}