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.CompletionService; 030 import java.util.concurrent.Executor; 031 import java.util.concurrent.ExecutorCompletionService; 032 033 public class AsyncShell implements Shell, Closeable { 034 035 /** . */ 036 final Shell shell; 037 038 /** . */ 039 private AsyncProcess current; 040 041 /** . */ 042 final CompletionService<AsyncProcess> executor; 043 044 /** . */ 045 boolean closed; 046 047 /** . */ 048 final Object lock = new Object(); 049 050 /** . */ 051 final Set<AsyncProcess> processes; 052 053 public AsyncShell(Executor executor, Shell shell) { 054 this.shell = shell; 055 this.current = null; 056 this.executor = new ExecutorCompletionService<AsyncProcess>(executor); 057 this.closed = false; 058 this.processes = Collections.synchronizedSet(new HashSet<AsyncProcess>()); 059 } 060 061 public void close() { 062 063 AsyncProcess[] toCancel = null; 064 synchronized (lock) { 065 if (closed) { 066 toCancel = null; 067 } else { 068 closed = true; 069 toCancel = processes.toArray(new AsyncProcess[processes.size()]); 070 } 071 } 072 073 // Cancel all process 074 if (toCancel != null) { 075 for (AsyncProcess process : toCancel) { 076 process.cancel(); 077 } 078 } 079 } 080 081 // Shell implementation ********************************************************************************************** 082 083 public String getWelcome() { 084 return shell.getWelcome(); 085 } 086 087 public String getPrompt() { 088 return shell.getPrompt(); 089 } 090 091 public CompletionMatch complete(String prefix) { 092 return shell.complete(prefix); 093 } 094 095 public AsyncProcess createProcess(String request) { 096 synchronized (lock) { 097 if (closed) { 098 throw new IllegalStateException(); 099 } 100 } 101 return new AsyncProcess(this, request); 102 } 103 }