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    
020    package org.crsh.shell.impl.async;
021    
022    import org.crsh.cli.impl.completion.CompletionMatch;
023    import org.crsh.shell.Shell;
024    
025    import java.io.Closeable;
026    import java.util.Collections;
027    import java.util.HashSet;
028    import java.util.Set;
029    import java.util.concurrent.ExecutorService;
030    
031    public 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    }