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HeuristicLab.Services.Hive.DataAccess

Timestamp:

06/05/11 22:35:40 (13 years ago)

Author:

cneumuel

Message:

#1233

refactoring of slave core
created JobManager, which is responsible for managing jobs without knowing anything about the service. this class is easier testable than slave core
lots of cleanup
created console test project for slave

Location:

Files:

-                      r6267
+                      r6357
                            where child.ParentJobId == ar.Job.JobId
                            select child).Count() > 0
                     orderby ar.Job.Priority descending
+                    orderby ar.Job.Priority, db.Random() descending
                     select Convert.ToDto(ar.Job);
         return count == 0 ? query.ToArray() : query.Take(count).ToArray();
 …
                        && ar.Job.CoresNeeded <= slave.FreeCores
                        && ar.Job.MemoryNeeded <= slave.FreeMemory
                     orderby ar.Job.Priority descending
+                    orderby ar.Job.Priority, db.Random() descending // take random job to avoid the race condition that occurs when this method is called concurrently (the same job would be returned)
                     select Convert.ToDto(ar.Job);
         var waitingJobs = (count == 0 ? query : query.Take(count)).ToArray();

-                      r6229
+                      r6357
+using System;
+using System.Data.Linq.Mapping;
 namespace HeuristicLab.Services.Hive.DataAccess {
   partial class SlaveStatistics {
 …
   partial class HiveDataContext {
+    // source: http://stackoverflow.com/questions/648196/random-row-from-linq-to-sql
+    [Function(Name = "NEWID", IsComposable = true)]
+    public Guid Random() {
+      // to prove not used by our C# code...
+      throw new NotImplementedException();
+    }
+  }
+}

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