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The solution implements a job sorter that can be added to the top of any job chain.
- This job implements a spooler_process() function that suspends all incoming orders.
- This job is configured for one task and with an idle timeout attribute, i.e. it executes incoming orders sequentually.
- After the last order this job waits for the duration specified with the idle_timeout attribute for new orders.
  - The idle timeout is configured by <job idle_timeout="10"> with the sorter job definition.
  - With the idle timeout being expired this job will execute its spooler_exit() function and will sort all orders that have previously been suspended.
    - Sorting is done in alphabetical order.
    - The orders are reinserted moved to the next job node that follows the sorter job in the job chain.
The sample included makes use of a job chain job_chain1 that includes the job nodes for the sorter job and a hello job. The job chain accepts Ad Hoc orders that are added by use of JOC and the job chain can easily be modified to watch for incoming files and to create ordersone order for each file.

Code Block

language	js
title	Job sorter
collapse	true

var jobChainPath = null;
var jobChainNodeState = null;
var jobChainNodeNextState = null;

function spooler_init() {
  spooler_log.info( ".. performing spooler_init()" );

  jobChainPath = spooler_task.order.job_chain.path;
  jobChainNodeState = spooler_task.order.job_chain_node.state;
  jobChainNodeNextState = spooler_task.order.job_chain_node.next_state;

  return true;
}

function spooler_process() {
  var rc = true;

  // suspend all orders, sorting is done on spooler_exit()
  spooler_log.info( ".. suspending current order" );
  spooler_task.order.suspended = true;
  spooler_task.order.state = jobChainNodeState;

  return rc;
}

function spooler_exit() {
  spooler_log.info( ".. peforming spooler_exit()" );
  var rc = true;
  var orderList = Array();

  // select all orders of the current job node
  var response = spooler.execute_xml( "<show_job_chain job_chain='" + jobChainPath + "' what='job_chain_orders'/>" );
  var orderDOM = new Packages.sos.xml.SOSXMLXPath( new java.lang.StringBuffer( response ) );
  var orderNodes = orderDOM.selectNodeList( "/spooler/answer/job_chain/job_chain_node[@state = '" + jobChainNodeState + "']/order_queue/order" );

  // traverse order list and add orders to sort array
  for( orderIndex=0; orderIndex<orderNodes.getLength(); orderIndex++ ) {
    var orderNode = orderNodes.item(orderIndex);
    var orderID = orderDOM.selectSingleNodeValue( orderNode, "@id" );
    if (orderID == null) {
      continue;
    }
    spooler_log.info( ".... order found: " + orderID );
    orderList.push( orderID );
  }

  // alphabetical string sort
  orderList.sort(function(a, b){return (a > b) - (a < b) });
  // numeric sort
  // orderList.sort(function(a, b){return b - a) });

  for(i=0; i<orderList.length; i++) {
    spooler_log.info( ".... moving order: " + orderList[i] );
    var response = spooler.execute_xml( "<modify_order job_chain='" + jobChainPath + "' order='" + orderList[i] + "' state='" + jobChainNodeNextState + "' suspended='no'/>" );
    var orderDOM = new Packages.sos.xml.SOSXMLXPath( new java.lang.StringBuffer( response ) );
    var errorCode = orderDOM.selectSingleNodeValue( "//ERROR/@code" );
    var errorText = orderDOM.selectSingleNodeValue( "//ERROR/@text" );
    if ( errorCode || errorText ) {
      spooler_log.error( "........ modify order state response: errorCode=" + errorCode + ", errorText=" + errorText );
      rc = false;
    }  
  }

  return rc;
}

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Add two orders to the job_chain1 job chain.
- Use an order id in descending alphabetical order, e.g. "cba" for the order id of the first order and "abc" for the order id of the second order.
Both orders will be suspended in the first node of the job chain.
After an idle timeout of 10s both orders are reinserted moved to the next job node in the job chain.
- This time the orders are processed in ascending alphabetical order.

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