Package org.globus.gram


package org.globus.gram
This library is a full implementation of the GRAM client API. It allows for submitting and canceling of jobs, polling for job status and sending signals to a job. The library enables a user to 'ping' a gatekeeper to verify if the user can authenticate to it. In addition, this library allows for registering and un-registering of callback listeners that listen for job status updates. The callbacks are implemented as Java events.
Beyond the functionality of Globus, the Java GRAM API allows the specification of the delegation type to perform-either full or limited.

Notification of state changes for GRAM jobs is supported by the user's class adding itself as a listener to a GramJob. See the example below for more details.

Example

public class GramExample implements GramJobListener {

   private someMethod() {
     ...

     String gramContact = "pitcairn.mcs.anl.gov:6722:...";
     String rsl = "invalid input: '&'(executable=...)(...)(...)";
     
     try {
         Gram.ping(gramContact);
     } catch (GramException e) {
        // can't submit
        return;
     }

     job.addListener(this);
     // add this class as a listener for state changes

     GramJob job = null;
     try {
        job = new GramJob(rsl);
        Gram.request(gramContact,job);
     } catch (GramException e) {
        // request failed
        ...
     }

     ...

     try {
         job.cancel();
     } catch (GramException e) {
       // cancel failed
       ...
     }
   }

   // this method must be implemented in order for the class to 
   // implement the GramJobListener class
   public stateChanged(GramJob job) {
       System.out.println("Job state change \n" +
                          "     ID   : " + job.getID() + "\n"  +
                          "     State: " + job.getStateAsString());
    }
}

Package Specification

For overviews, tutorials, examples, guides, and tool documentation, please see:
  • Class
    Description
    The Server class acts as a basic multi-threaded HTTPS server.
    This is the main class for using the Globus GRAM API It implements all of the GRAM API functionality such as job submission, canceling, gatekeeper pinging, and job signaling.
    A convienience class for operating on GRAM-specific RSL attributes.
     
    This class defeines the Exceptions which are thrown by the various Gram and GramJob methods.
    This class represents a simple gram job.
    This interface is used to allow objects created by the Globus user to listen for status changes of GramJobs.
     
    This class represents a specific type of GramException.