Class JobFrontend

java.lang.Object
edu.rit.pj.cluster.JobFrontend
All Implemented Interfaces:
JobFrontendRef, Runnable

public class JobFrontend extends Object implements Runnable, JobFrontendRef
Class JobFrontend provides the message handler for the PJ job frontend process.
Version:
20-Jun-2012
Author:
Alan Kaminsky
  • Constructor Details

    • JobFrontend

      public JobFrontend(String username, int Nn, int Np, int Nt, boolean hasFrontendComm, String mainClassName, String[] args) throws IOException
      Construct a new job frontend object. The job frontend object will contact the Job Scheduler Daemon specified by the "pj.host" and "pj.port" Java system properties. See class PJProperties for further information.
      Parameters:
      username - User name.
      Nn - Number of backend nodes (>= 1).
      Np - Number of processes (>= 1).
      Nt - Number of CPUs per process (>= 0). 0 means "all CPUs."
      hasFrontendComm - True if the job has the frontend communicator, false if it doesn't.
      mainClassName - Main class name.
      args - Command line arguments.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
  • Method Details

    • run

      public void run()
      Run this Job Frontend.
      Specified by:
      run in interface Runnable
    • assignBackend

      public void assignBackend(JobSchedulerRef theJobScheduler, String name, String host, String jvm, String classpath, String[] jvmflags, String shellCommand, int Nt) throws IOException
      Assign a backend process to the job.

      Assign a backend process to the job.

      Specified by:
      assignBackend in interface JobFrontendRef
      Parameters:
      theJobScheduler - Job Scheduler that is calling this method.
      name - Backend node name.
      host - Host name for SSH remote login.
      jvm - Full pathname of Java Virtual Machine.
      classpath - Java class path for PJ Library.
      jvmflags - Array of JVM command line flags.
      shellCommand - Shell command string.
      Nt - Number of CPUs assigned to the process.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • assignJobNumber

      public void assignJobNumber(JobSchedulerRef theJobScheduler, int jobnum, String pjhost) throws IOException
      Assign a job number to the job. The host name for the job frontend's middleware channel group is also specified.

      Assign a job number to the job. The host name for the job frontend's middleware channel group is also specified.

      Specified by:
      assignJobNumber in interface JobFrontendRef
      Parameters:
      theJobScheduler - Job Scheduler that is calling this method.
      jobnum - Job number.
      pjhost - Host name for middleware channel group.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • cancelJob

      public void cancelJob(JobSchedulerRef theJobScheduler, String errmsg) throws IOException
      Cancel the job.

      Cancel the job.

      Specified by:
      cancelJob in interface JobFrontendRef
      Parameters:
      theJobScheduler - Job Scheduler that is calling this method.
      errmsg - Error message string.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • renewLease

      public void renewLease(JobSchedulerRef theJobScheduler) throws IOException
      Renew the lease on the job.
      Specified by:
      renewLease in interface JobFrontendRef
      Parameters:
      theJobScheduler - Job Scheduler that is calling this method.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • backendFinished

      public void backendFinished(JobBackendRef theJobBackend) throws IOException
      Report that a backend process has finished executing the job.

      Report that a backend process has finished executing the job.

      Specified by:
      backendFinished in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • backendReady

      public void backendReady(JobBackendRef theJobBackend, int rank, InetSocketAddress middlewareAddress, InetSocketAddress worldAddress, InetSocketAddress frontendAddress) throws IOException
      Report that a backend process is ready to commence executing the job.

      Report that a backend process is ready to commence executing the job.

      Specified by:
      backendReady in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      rank - Rank of the job backend process.
      middlewareAddress - Host/port to which the job backend process is listening for middleware messages.
      worldAddress - Host/port to which the job backend process is listening for the world communicator.
      frontendAddress - Host/port to which the job backend process is listening for the frontend communicator, or null if the frontend communicator does not exist.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • cancelJob

      public void cancelJob(JobBackendRef theJobBackend, String errmsg) throws IOException
      Cancel the job.

      Cancel the job.

      Specified by:
      cancelJob in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      errmsg - Error message string.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • renewLease

      public void renewLease(JobBackendRef theJobBackend) throws IOException
      Renew the lease on the job.

      Renew the lease on the job.

      Specified by:
      renewLease in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • requestResource

      public void requestResource(JobBackendRef theJobBackend, String resourceName) throws IOException
      Request the given resource from this job frontend's class loader.

      Request the given resource from this job frontend's class loader.

      Specified by:
      requestResource in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      resourceName - Resource name.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • outputFileOpen

      public void outputFileOpen(JobBackendRef theJobBackend, int bfd, File file, boolean append) throws IOException
      Open the given output file for writing or appending.

      Open the given output file for writing or appending.

      Specified by:
      outputFileOpen in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      bfd - Backend file descriptor.
      file - File.
      append - True to append, false to overwrite.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • outputFileWrite

      public void outputFileWrite(JobBackendRef theJobBackend, int ffd, byte[] buf, int off, int len) throws IOException
      Write the given bytes to the given output file. ffd = 1 refers to the job's standard output stream; ffd = 2 refers to the job's standard error stream; other values refer to a previously opened file.

      Write the given bytes to the given output file. ffd = 1 refers to the job's standard output stream; ffd = 2 refers to the job's standard error stream; other values refer to a previously opened file.

      Specified by:
      outputFileWrite in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      ffd - Frontend file descriptor.
      buf - Array of bytes to write.
      off - Index of first byte to write.
      len - Number of bytes to write.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • outputFileFlush

      public void outputFileFlush(JobBackendRef theJobBackend, int ffd) throws IOException
      Flush accumulated bytes to the given output file.

      Flush accumulated bytes to the given output file.

      Specified by:
      outputFileFlush in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      ffd - Frontend file descriptor.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • outputFileClose

      public void outputFileClose(JobBackendRef theJobBackend, int ffd) throws IOException
      Close the given output file.

      Close the given output file.

      Specified by:
      outputFileClose in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      ffd - Frontend file descriptor.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • inputFileOpen

      public void inputFileOpen(JobBackendRef theJobBackend, int bfd, File file) throws IOException
      Open the given input file for reading.

      Open the given input file for reading.

      Specified by:
      inputFileOpen in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      bfd - Backend file descriptor.
      file - File.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • inputFileRead

      public void inputFileRead(JobBackendRef theJobBackend, int ffd, int len) throws IOException
      Read bytes from the given input file. ffd = 1 refers to the job's standard input stream; other values refer to a previously opened file.

      Read bytes from the given input file. ffd = 1 refers to the job's standard input stream; other values refer to a previously opened file.

      Specified by:
      inputFileRead in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      ffd - Frontend file descriptor.
      len - Number of bytes to read.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • inputFileSkip

      public void inputFileSkip(JobBackendRef theJobBackend, int ffd, long len) throws IOException
      Skip bytes from the given input file.

      Skip bytes from the given input file.

      Specified by:
      inputFileSkip in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      ffd - Frontend file descriptor.
      len - Number of bytes to skip.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • inputFileClose

      public void inputFileClose(JobBackendRef theJobBackend, int ffd) throws IOException
      Close the given input file.

      Close the given input file.

      Specified by:
      inputFileClose in interface JobFrontendRef
      Parameters:
      theJobBackend - Job Backend that is calling this method.
      ffd - Frontend file descriptor.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • reportComment

      public void reportComment(JobBackendRef theJobBackend, int rank, String comment) throws IOException
      Report a comment for a process.

      Report a comment for a process.

      Specified by:
      reportComment in interface JobFrontendRef
      Parameters:
      theJobBackend - Job backend that is calling this method.
      rank - Process rank.
      comment - Comment string.
      Throws:
      IOException - Thrown if an I/O error occurred.
      IOException - if any.
    • close

      public void close()
      Close communication with this Job Frontend.
      Specified by:
      close in interface JobFrontendRef