ShellExecutor.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.turro.elephant.impl.util;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.turro.elephant.context.ElephantContext;
 
public class ShellExecutor {
 
  class StreamExecutor extends Thread {
 
    InputStream is;
    Level level;
 
    StreamExecutor(InputStream is, Level level) {
      this.is = is;
      this.level = level;
    }
 
    @Override
    public void run() {
      try {
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        String line = null;
        while ((line = br.readLine()) != null) {
          Logger.getLogger(StreamExecutor.class.getName()).log(level, line);
        }
      } catch (IOException ioe) {
        ioe.printStackTrace();
      }
    }
  }
 
  public ShellExecutor() {
  }
 
  public int execute(String command) {
 
    try {
      String cmd[] = new String[3];
 
      cmd[0] = "sh";
      cmd[1] = "-c";
      cmd[2] = command;
 
      Runtime rt = Runtime.getRuntime();
      Logger.getLogger(ShellExecutor.class.getName()).log(Level.INFO, "Executor: " + command);
 
      Process proc = rt.exec(cmd);
 
      StreamExecutor errorStream = new StreamExecutor(proc.getErrorStream(), Level.SEVERE);
 
      StreamExecutor outputStream = new StreamExecutor(proc.getInputStream(), Level.INFO);
 
      errorStream.start();
      outputStream.start();
 
      int exitVal = proc.waitFor();
 
      Logger.getLogger(ShellExecutor.class.getName()).log(Level.INFO, "Executor exit value for " + command + ": " + exitVal);
      
      return exitVal;
 
    } catch (Throwable t) {
      Logger.getLogger(ShellExecutor.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), t);
    }
 
    return -1;
  }
}