/*
* Copyright (C) 2012 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.crsh.shell.impl.command;
import org.crsh.keyboard.KeyHandler;
import org.crsh.shell.ShellProcess;
import org.crsh.shell.ShellProcessContext;
import org.crsh.shell.ShellResponse;
import java.util.logging.Level;
abstract class CRaSHProcess implements ShellProcess {
/** . */
protected final CRaSHSession crash;
/** . */
protected final String request;
/** . */
private volatile Thread thread;
/** . */
private volatile boolean cancelled;
protected CRaSHProcess(CRaSHSession crash, String request) {
this.crash = crash;
this.request = request;
}
public void execute(ShellProcessContext processContext) {
ClassLoader previous = crash.setCRaSHLoader();
try {
ShellResponse resp;
thread = Thread.currentThread();
//
String userName = crash.user != null ? crash.user.getName() : "unauthenticated";
CRaSHSession.accessLog.log(Level.FINE, "User " + userName + " executes " + request);
//
try {
try {
resp = doInvoke(processContext);
if (Thread.interrupted() || cancelled) {
throw new InterruptedException("like a goto");
}
}
catch (InterruptedException e) {
// Preserve interrupt status
Thread.currentThread().interrupt();
resp = ShellResponse.cancelled();
}
} catch (Throwable t) {
resp = ShellResponse.internalError("Unexpected error when executing process", t);
} finally {
thread = null;
}
//
processContext.end(resp);
//
if (resp instanceof ShellResponse.Error) {
ShellResponse.Error error = (ShellResponse.Error)resp;
Throwable t = error.getThrowable();
if (t != null) {
CRaSHSession.log.log(Level.SEVERE, "Error while evaluating request '" + request + "' " + error.getMessage(), t);
} else {
CRaSHSession.log.log(Level.SEVERE, "Error while evaluating request '" + request + "' " + error.getMessage());
}
}
}
finally {
crash.setPreviousLoader(previous);
}
}
@Override
public KeyHandler getKeyHandler() {
return null;
}
abstract ShellResponse doInvoke(ShellProcessContext context) throws InterruptedException;
public void cancel() {
ClassLoader previous = crash.setCRaSHLoader();
try {
Thread t = thread;
if (t != null) {
t.interrupt();
}
cancelled = true;
}
finally {
crash.setPreviousLoader(previous);
}
}
}