Package com.sun.grid.util.expect

Class Expect

  • public class Expect
extends java.lang.Object
    Simple helper class for handling output of a process. It works similar as the tcl expect command.

    Example

       
    char [] password = null;
    String username = null;
    long timeout = 60 * 1000;
    String [] cmd = new String[] { "su", "username", "-c" , "ls" };

    Expect expect = new Expect(cmd);

    expect.addHandler(new ExpectPasswordHandler("password: ", password));

    expect.addHandler(new ExpectHandler() {

        // print every line after the password question to System.out
        public void handle(Expect expect, ExpectBuffer buffer) {
 
            String line = buffer.consumeLine();
            if(line != null) {
               System.out.println(line);
            } 

        }
    });

    if(expect.exec(timeout) == 0 ) {
       System.out.println("ls as user " + username + " successfully executed");
    }

    • Constructor Summary

      Constructors 
      Constructor Description
      Expect()  
      Expect​(java.lang.String[] cmd)
      Creates a new instance of Expect

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void add​(ExpectHandler handler)
      Add a new expect handler.
      java.util.List command()  
      java.util.List env()  
      int exec​(long timeout)
      Execute the command and call the registered handlers.
      void flush()
      Flush stdin
      void print​(boolean b)
      print a boolean to stdin
      void print​(char c)
      print a char to stdin.
      void print​(char[] s)
      print a char arrary to stdin !!!Attention!!!: For security reasons this method should not be used to send passwords to the process, sice the content of s is written to the logger.
      void print​(double d)
      print a double to stdin
      void print​(float x)
      print a float to stdin.
      void print​(int i)
      print an integer to stdin
      void print​(long l)
      print a long to stdin
      void print​(java.lang.Object obj)
      print an object to stdin
      void print​(java.lang.String s)
      print a string to stdin
      void println()
      print linefeed to stdin.
      void println​(boolean x)
      print a boolean to stdin (with linefeed)
      void println​(char x)
      print a char to stdin.
      void println​(char[] x)
      print a char arrary to stdin (with line feed) !!!Attention!!!: For security reasons this method should not be used to send passwords to the process, sice the content of x is written to the logger.
      void println​(double x)
      print a double to stdin (with linefeed)
      void println​(float x)
      print a float to stdin (with linefeed).
      void println​(int x)
      print an integer to stdin (with linefeed)
      void println​(long x)
      print a long to stdin (with linefeed)
      void println​(java.lang.Object x)
      print an object to stdin (with linefeed)
      void println​(java.lang.String x)
      print a string to stdin (with line separator)
      void printlnPassword​(char[] s)
      print a password to stdin (with linefeed)
      void printPassword​(char[] s)
      print a password to stdin

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • Expect

        public Expect()

      • Expect

        public Expect​(java.lang.String[] cmd)
        Creates a new instance of Expect
        Parameters:
        cmd - the command which will be executed
        See Also:
        Runtime.exec(String[])

    • Method Detail

      • command

        public java.util.List command()

      • env

        public java.util.List env()

      • add

        public void add​(ExpectHandler handler)
        Add a new expect handler.
        Parameters:
        handler - the expect handler

      • exec

        public int exec​(long timeout)
         throws java.io.IOException,
                java.lang.InterruptedException
        Execute the command and call the registered handlers.
        Parameters:
        timeout - timout for the command in milliseconds
        Returns:
        the exit code of the command
        Throws:
        java.io.IOException - if the execution of the command failed
        java.lang.InterruptedException - if the current thread has been interrupted before the command has been finished.

      • flush

        public void flush()
        Flush stdin

      • println

        public void println​(java.lang.String x)
        print a string to stdin (with line separator)
        Parameters:
        x - the string

      • print

        public void print​(java.lang.String s)
        print a string to stdin
        Parameters:
        s - the string

      • println

        public void println​(java.lang.Object x)
        print an object to stdin (with linefeed)
        Parameters:
        x - the object

      • print

        public void print​(java.lang.Object obj)
        print an object to stdin
        Parameters:
        obj - the object

      • println

        public void println​(int x)
        print an integer to stdin (with linefeed)
        Parameters:
        x - the integer

      • print

        public void print​(int i)
        print an integer to stdin
        Parameters:
        i - the integer

      • print

        public void print​(boolean b)
        print a boolean to stdin
        Parameters:
        b - the boolean

      • println

        public void println​(boolean x)
        print a boolean to stdin (with linefeed)
        Parameters:
        x - the boolean

      • println

        public void println​(long x)
        print a long to stdin (with linefeed)
        Parameters:
        x - the long

      • print

        public void print​(long l)
        print a long to stdin
        Parameters:
        l - the long

      • println

        public void println​(double x)
        print a double to stdin (with linefeed)
        Parameters:
        x - the double

      • println

        public void println​(char[] x)
        print a char arrary to stdin (with line feed) !!!Attention!!!: For security reasons this method should not be used to send passwords to the process, sice the content of x is written to the logger.
        Parameters:
        x - the char array

      • print

        public void print​(char[] s)
        print a char arrary to stdin !!!Attention!!!: For security reasons this method should not be used to send passwords to the process, sice the content of s is written to the logger.
        Parameters:
        s - the char array

      • printPassword

        public void printPassword​(char[] s)
        print a password to stdin
        Parameters:
        s - the password

      • printlnPassword

        public void printlnPassword​(char[] s)
        print a password to stdin (with linefeed)
        Parameters:
        s - the password

      • print

        public void print​(double d)
        print a double to stdin
        Parameters:
        d - the double

      • println

        public void println​(char x)
        print a char to stdin.
        Parameters:
        x - the char

      • print

        public void print​(char c)
        print a char to stdin.
        Parameters:
        c - the char

      • println

        public void println​(float x)
        print a float to stdin (with linefeed).
        Parameters:
        x - the float

      • print

        public void print​(float x)
        print a float to stdin.
        Parameters:
        x - the float

      • println

        public void println()
        print linefeed to stdin.