/// <summary>
/// Start execution.
/// </summary>
/// <param name="grid">Ignite instance.</param>
/// <param name="writer">Writer.</param>
/// <param name="cb">Callback invoked when all necessary data is written to stream.</param>
/// <param name="qry">Query.</param>
public void Start(Ignite grid, PortableWriterImpl writer, Func <IUnmanagedTarget> cb,
ContinuousQuery <TK, TV> qry)
{
// 1. Inject resources.
ResourceProcessor.Inject(_lsnr, grid);
ResourceProcessor.Inject(_filter, grid);
// 2. Allocate handle.
_hnd = grid.HandleRegistry.Allocate(this);
// 3. Write data to stream.
writer.WriteLong(_hnd);
writer.WriteBoolean(qry.Local);
writer.WriteBoolean(_filter != null);
ContinuousQueryFilterHolder filterHolder = _filter == null || qry.Local ? null :
new ContinuousQueryFilterHolder(typeof(TK), typeof(TV), _filter, _keepPortable);
writer.WriteObject(filterHolder);
writer.WriteInt(qry.BufferSize);
writer.WriteLong((long)qry.TimeInterval.TotalMilliseconds);
writer.WriteBoolean(qry.AutoUnsubscribe);
// 4. Call Java.
_nativeQry = cb();
// 5. Initial query.
var nativeInitialQryCur = UU.ContinuousQueryGetInitialQueryCursor(_nativeQry);
_initialQueryCursor = nativeInitialQryCur == null
? null
: new QueryCursor <TK, TV>(nativeInitialQryCur, _marsh, _keepPortable);
}
/** <inheritDoc /> */
internal override void Write(PortableWriterImpl writer, bool keepPortable)
{
writer.WriteBoolean(Local);
writer.WriteInt(PageSize);
writer.WriteBoolean(Partition.HasValue);
if (Partition.HasValue)
{
writer.WriteInt(Partition.Value);
}
if (Filter == null)
{
writer.WriteObject <CacheEntryFilterHolder>(null);
}
else
{
var holder = new CacheEntryFilterHolder(Filter, (key, val) => Filter.Invoke(
new CacheEntry <TK, TV>((TK)key, (TV)val)), writer.Marshaller, keepPortable);
writer.WriteObject(holder);
writer.WriteLong(holder.Handle);
}
}
/// <summary>
/// Writes the job.
/// </summary>
/// <param name="job">The job.</param>
/// <param name="writer">The writer.</param>
/// <returns>Handle to the job holder</returns>
private long WriteJob(IComputeJob job, PortableWriterImpl writer)
{
var jobHolder = new ComputeJobHolder((Ignite)_prj.Ignite, job);
var jobHandle = Marshaller.Ignite.HandleRegistry.Allocate(jobHolder);
writer.WriteLong(jobHandle);
writer.WriteObject(jobHolder);
return(jobHandle);
}
public void Map(PlatformMemoryStream inStream, PlatformMemoryStream outStream)
{
IList <IClusterNode> subgrid;
ClusterGroupImpl prj = (ClusterGroupImpl)_compute.ClusterGroup;
var ignite = (Ignite)prj.Ignite;
// 1. Unmarshal topology info if topology changed.
var reader = prj.Marshaller.StartUnmarshal(inStream);
if (reader.ReadBoolean())
{
long topVer = reader.ReadLong();
List <IClusterNode> nodes = new List <IClusterNode>(reader.ReadInt());
int nodesCnt = reader.ReadInt();
subgrid = new List <IClusterNode>(nodesCnt);
for (int i = 0; i < nodesCnt; i++)
{
IClusterNode node = ignite.GetNode(reader.ReadGuid());
nodes.Add(node);
if (reader.ReadBoolean())
{
subgrid.Add(node);
}
}
// Update parent projection to help other task callers avoid this overhead.
// Note that there is a chance that topology changed even further and this update fails.
// It means that some of subgrid nodes could have left the Grid. This is not critical
// for us, because Java will handle it gracefully.
prj.UpdateTopology(topVer, nodes);
}
else
{
IList <IClusterNode> nodes = prj.NodesNoRefresh();
Debug.Assert(nodes != null, "At least one topology update should have occurred.");
subgrid = IgniteUtils.Shuffle(nodes);
}
// 2. Perform map.
IDictionary <IComputeJob <T>, IClusterNode> map;
Exception err;
try
{
map = _task.Map(subgrid, _arg);
err = null;
}
catch (Exception e)
{
map = null;
err = e;
// Java can receive another exception in case of marshalling failure but it is not important.
Finish(default(TR), e);
}
// 3. Write map result to the output stream.
PortableWriterImpl writer = prj.Marshaller.StartMarshal(outStream);
try
{
if (err == null)
{
writer.WriteBoolean(true); // Success flag.
if (map == null)
{
writer.WriteBoolean(false); // Map produced no result.
}
else
{
writer.WriteBoolean(true); // Map produced result.
writer.WriteInt(map.Count); // Amount of mapped jobs.
var jobHandles = new List <long>(map.Count);
foreach (KeyValuePair <IComputeJob <T>, IClusterNode> mapEntry in map)
{
var job = new ComputeJobHolder(_compute.ClusterGroup.Ignite as Ignite, mapEntry.Key.ToNonGeneric());
IClusterNode node = mapEntry.Value;
var jobHandle = ignite.HandleRegistry.Allocate(job);
jobHandles.Add(jobHandle);
writer.WriteLong(jobHandle);
if (node.IsLocal)
{
writer.WriteBoolean(false); // Job is not serialized.
}
else
{
writer.WriteBoolean(true); // Job is serialized.
writer.WriteObject(job);
}
writer.WriteGuid(node.Id);
}
_jobHandles = jobHandles;
}
}
else
{
writer.WriteBoolean(false); // Map failed.
// Write error as string because it is not important for Java, we need only to print
// a message in the log.
writer.WriteString("Map step failed [errType=" + err.GetType().Name +
", errMsg=" + err.Message + ']');
}
}
catch (Exception e)
{
// Something went wrong during marshaling.
Finish(default(TR), e);
outStream.Reset();
writer.WriteBoolean(false); // Map failed.
writer.WriteString(e.Message); // Write error message.
}
finally
{
prj.Marshaller.FinishMarshal(writer);
}
}
