org.teiid.dqp.internal.process

Class RequestWorkItem

java.lang.Object

org.teiid.dqp.internal.process.AbstractWorkItem

org.teiid.dqp.internal.process.RequestWorkItem

All Implemented Interfaces:

Runnable, ThreadReuseExecutor.PrioritizedRunnable

public class RequestWorkItem
extends AbstractWorkItem
implements ThreadReuseExecutor.PrioritizedRunnable

Compiles results and other information for the client. There is quite a bit of logic surrounding forming batches to prevent buffer growth, send multiple batches at a time, partial batches, etc. There is also special handling for the update count case, which needs to read the entire result before sending it back to the client.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RequestWorkItem.MoreWorkTask

Field Summary

Fields

Modifier and Type	Field and Description
protected DQPCore	dqpCore
static String	REQUEST_KEY
protected boolean	useCallingThread

Fields inherited from interface org.teiid.dqp.internal.process.ThreadReuseExecutor.PrioritizedRunnable

NO_WAIT_PRIORITY

Constructor Summary

Constructors

Constructor and Description
RequestWorkItem(DQPCore dqpCore, RequestMessage requestMsg, Request request, ResultsReceiver<ResultsMessage> receiver, RequestID requestID, DQPWorkContext workContext)

Method Summary

Modifier and Type	Method and Description
void	addConnectorRequest(AtomicRequestID atomicRequestId, DataTierTupleSource connInfo)
<T> FutureWork<T>	addRequestWork(Callable<T> callable)
protected void	close() Client close is currently implemented as asynch.
void	closeAtomicRequest(AtomicRequestID atomicRequestId)
ResultsMessage	createResultsMessage(List<? extends List<?>> batch, List<? extends Expression> columnSymbols)
void	doMoreWork() Special call from request threads to allow resumption of processing by the calling thread.
long	getCreationTime()
DQPCore	getDqpCore()
DQPWorkContext	getDqpWorkContext()
int	getPriority() The execution priority - higher is lower
long	getProcessingTimestamp()
QueryProcessor	getProcessor()
PlanNode	getQueryPlan()
RequestID	getRequestID()
SessionAwareCache<CachedResults>	getRsCache()
io.opentracing.Span	getTracingSpan()
boolean	isCloseRequested()
protected boolean	isDoneProcessing()
protected void	process()
void	processLobChunkRequest(String id, int streamRequestId, ResultsReceiver<LobChunk> chunckReceiver)
protected void	processMore()
protected void	processNew()
void	removeLobStream(int streamRequestId)
boolean	requestCancel(String reason)
void	requestClose()
void	requestMore(int batchFirst, int batchLast, ResultsReceiver<ResultsMessage> receiver)
protected void	resumeProcessing()
void	run()
Future<Void>	scheduleWork(long delay)
protected boolean	sendResultsIfNeeded(TupleBatch batch) Send results if they have been requested.
void	setCancelTask(EnhancedTimer.Task cancelTask)
void	setTracingSpan(io.opentracing.Span span)
String	toString()

Methods inherited from class org.teiid.dqp.internal.process.AbstractWorkItem

isProcessing, moreWork, moreWork, pauseProcessing

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

REQUEST_KEY

public static final String REQUEST_KEY

See Also:

Constant Field Values

dqpCore

protected final DQPCore dqpCore

useCallingThread

protected boolean useCallingThread

Constructor Detail

RequestWorkItem

public RequestWorkItem(DQPCore dqpCore,
                       RequestMessage requestMsg,
                       Request request,
                       ResultsReceiver<ResultsMessage> receiver,
                       RequestID requestID,
                       DQPWorkContext workContext)

Method Detail

isDoneProcessing

protected boolean isDoneProcessing()

Specified by:

isDoneProcessing in class AbstractWorkItem

run

public void run()

Specified by:

run in interface Runnable

Overrides:

run in class AbstractWorkItem

resumeProcessing

protected void resumeProcessing()

Specified by:

resumeProcessing in class AbstractWorkItem

doMoreWork

public void doMoreWork()

Special call from request threads to allow resumption of processing by the calling thread.

process

protected void process()

Specified by:

process in class AbstractWorkItem

processMore

protected void processMore()
                    throws BlockedException,
                           TeiidException

Throws:

BlockedException

TeiidException

close

protected void close()

Client close is currently implemented as asynch. Any errors that occur will not make it to the client, instead we just log them here.

processNew

protected void processNew()
                   throws TeiidProcessingException,
                          TeiidComponentException

Throws:

TeiidProcessingException

TeiidComponentException

getRsCache

public SessionAwareCache<CachedResults> getRsCache()

sendResultsIfNeeded

protected boolean sendResultsIfNeeded(TupleBatch batch)
                               throws TeiidComponentException,
                                      TeiidProcessingException

Send results if they have been requested. This should only be called from the processing thread.

Returns:

true if the batch should be buffered

Throws:

TeiidComponentException

TeiidProcessingException

createResultsMessage

public ResultsMessage createResultsMessage(List<? extends List<?>> batch,
                                           List<? extends Expression> columnSymbols)

getQueryPlan

public PlanNode getQueryPlan()

processLobChunkRequest

public void processLobChunkRequest(String id,
                                   int streamRequestId,
                                   ResultsReceiver<LobChunk> chunckReceiver)

removeLobStream

public void removeLobStream(int streamRequestId)

requestCancel

public boolean requestCancel(String reason)
                      throws TeiidComponentException

Throws:

TeiidComponentException

requestClose

public void requestClose()
                  throws TeiidComponentException

Throws:

TeiidComponentException

isCloseRequested

public boolean isCloseRequested()

requestMore

public void requestMore(int batchFirst,
                        int batchLast,
                        ResultsReceiver<ResultsMessage> receiver)

closeAtomicRequest

public void closeAtomicRequest(AtomicRequestID atomicRequestId)

addConnectorRequest

public void addConnectorRequest(AtomicRequestID atomicRequestId,
                                DataTierTupleSource connInfo)

toString

public String toString()

Specified by:

toString in class AbstractWorkItem

getDqpWorkContext

public DQPWorkContext getDqpWorkContext()

Specified by:

getDqpWorkContext in interface ThreadReuseExecutor.PrioritizedRunnable

getProcessingTimestamp

public long getProcessingTimestamp()

getPriority

public int getPriority()

Description copied from interface: ThreadReuseExecutor.PrioritizedRunnable

The execution priority - higher is lower

Specified by:

getPriority in interface ThreadReuseExecutor.PrioritizedRunnable

getCreationTime

public long getCreationTime()

Specified by:

getCreationTime in interface ThreadReuseExecutor.PrioritizedRunnable

addRequestWork

public <T> FutureWork<T> addRequestWork(Callable<T> callable)

scheduleWork

public Future<Void> scheduleWork(long delay)

setCancelTask

public void setCancelTask(EnhancedTimer.Task cancelTask)

getProcessor

public QueryProcessor getProcessor()

getRequestID

public RequestID getRequestID()

setTracingSpan

public void setTracingSpan(io.opentracing.Span span)

getTracingSpan

public io.opentracing.Span getTracingSpan()

getDqpCore

public DQPCore getDqpCore()