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