001 /* 002 * Copyright (C) 2010 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 package org.crsh.shell.impl; 020 021 import org.crsh.shell.ShellProcess; 022 import org.crsh.shell.ShellProcessContext; 023 import org.crsh.shell.ShellResponse; 024 025 /** 026 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> 027 */ 028 abstract class CRaSHProcess implements ShellProcess { 029 030 /** . */ 031 protected final CRaSHSession crash; 032 033 /** . */ 034 protected final String request; 035 036 /** . */ 037 private volatile Thread thread; 038 039 /** . */ 040 private volatile boolean cancelled; 041 042 protected CRaSHProcess(CRaSHSession crash, String request) { 043 this.crash = crash; 044 this.request = request; 045 } 046 047 public void execute(ShellProcessContext processContext) { 048 ClassLoader previous = crash.setCRaSHLoader(); 049 try { 050 ShellResponse resp; 051 thread = Thread.currentThread(); 052 053 // 054 if (crash.user != null) { 055 String userName = crash.user != null ? crash.user.getName() : "unauthenticated"; 056 CRaSHSession.accessLog.debug("User " + userName + " executes " + request); 057 } 058 059 // 060 try { 061 try { 062 resp = doInvoke(processContext); 063 if (Thread.interrupted() || cancelled) { 064 throw new InterruptedException("like a goto"); 065 } 066 } 067 catch (InterruptedException e) { 068 resp = ShellResponse.cancelled(); 069 } 070 } catch (Throwable t) { 071 resp = ShellResponse.internalError("Unexpected error when executing process", t); 072 } finally { 073 thread = null; 074 } 075 076 // 077 processContext.end(resp); 078 079 // 080 if (resp instanceof ShellResponse.Error) { 081 ShellResponse.Error error = (ShellResponse.Error)resp; 082 Throwable t = error.getThrowable(); 083 if (t != null) { 084 CRaSHSession.log.error("Error while evaluating request '" + request + "' " + error.getText(), t); 085 } else { 086 CRaSHSession.log.error("Error while evaluating request '" + request + "' " + error.getText()); 087 } 088 } 089 } 090 finally { 091 crash.setPreviousLoader(previous); 092 } 093 } 094 095 abstract ShellResponse doInvoke(ShellProcessContext context) throws InterruptedException; 096 097 public void cancel() { 098 ClassLoader previous = crash.setCRaSHLoader(); 099 try { 100 Thread t = thread; 101 if (t != null) { 102 t.interrupt(); 103 } 104 cancelled = true; 105 } 106 finally { 107 crash.setPreviousLoader(previous); 108 } 109 } 110 }