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//******************************************************************************
//
// File: BackendInfo.java
// Package: edu.rit.pj.cluster
// Unit: Class edu.rit.pj.cluster.BackendInfo
//
// This Java source file is copyright (C) 2012 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ 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 General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.pj.cluster;
import java.util.LinkedList;
import java.util.List;
/**
* Class BackendInfo provides a record of information about one backend node in
* the PJ cluster middleware.
*
* @author Alan Kaminsky
* @version 20-Jun-2012
*/
public class BackendInfo
{
// Exported enumerations.
/**
* The state of a backend node.
*/
public static enum State
{
/**
* The backend is available for jobs.
*/
IDLE ("Idle"),
/**
* The backend is reserved for a job that has not yet started running.
*/
RESERVED ("Reserved"),
/**
* The backend is running a job.
*/
RUNNING ("Running"),
/**
* The backend has failed.
*/
FAILED ("Failed");
private final String stringForm;
/**
* Construct a new State value.
*
* @param stringForm String form.
*/
State
(String stringForm)
{
this.stringForm = stringForm;
}
/**
* Returns a string version of this State value.
*
* @return String version.
*/
public String toString()
{
return stringForm;
}
}
// Exported data members.
/**
* The backend's name.
*/
public String name;
/**
* The total number of CPUs in the backend.
*/
public int totalCpus;
/**
* The backend's state.
*/
public State state;
/**
* The time when the backend entered its current state (milliseconds since
* midnight 01-Jan-1970 GMT).
*/
public long stateTime;
/**
* The host name for SSH remote logins to the backend.
*/
public String host;
/**
* The full pathname for executing the Java Virtual Machine (JVM) on the
* backend.
*/
public String jvm;
/**
* The Java class path for the Parallel Java Library on the backend.
*/
public String classpath;
/**
* Array of command line flags for the JVM (zero or more).
*/
public String[] jvmflags;
/**
* Shell command string on the backend.
*/
public String shellCommand;
/**
* The job that has reserved or is running on the backend.
*/
public JobInfo job;
// Exported constructors.
/**
* Construct a new backend information record.
*
* @param name The backend's name.
* @param totalCpus The total number of CPUs in the backend.
* @param state The backend's state.
* @param stateTime The time when the backend entered its current
* state.
* @param host The host name for SSH remote logins to the backend.
* @param jvm The full pathname for executing the Java Virtual
* Machine (JVM) on the backend.
* @param classpath The Java class path for the Parallel Java Library
* on the backend.
* @param jvmflags Array of command line flags for the JVM (zero or
* more).
* @param shellCommand Shell command string.
*/
public BackendInfo
(String name,
int totalCpus,
State state,
long stateTime,
String host,
String jvm,
String classpath,
String[] jvmflags,
String shellCommand)
{
this.name = name;
this.totalCpus = totalCpus;
this.state = state;
this.stateTime = stateTime;
this.host = host;
this.jvm = jvm;
this.classpath = classpath;
this.jvmflags = jvmflags;
this.shellCommand = shellCommand;
}
}
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