com.mapr.ojai.store.impl

Class RowkeyLookup

java.lang.Object

com.mapr.ojai.store.impl.AbstractDocumentStream

com.mapr.ojai.store.impl.AbstractDocumentFilter

com.mapr.ojai.store.impl.RowkeyLookup

All Implemented Interfaces:

com.mapr.db.impl.OjaiQueryProperties, PipelineControl, java.lang.AutoCloseable, java.lang.Iterable<org.ojai.Document>, org.ojai.DocumentStream

public class RowkeyLookup
extends AbstractDocumentFilter

Processing pipeline element for doing rowkey lookups. This is meant to be used after a scan that does an index lookup, in order to look up the rest of the document to be returned.

Nested Class Summary

Nested classes/interfaces inherited from interface com.mapr.db.impl.OjaiQueryProperties

com.mapr.db.impl.OjaiQueryProperties.QueryPath

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_BATCH_SIZE

Fields inherited from class com.mapr.ojai.store.impl.AbstractDocumentFilter

docIter, upstreamStream

Fields inherited from class com.mapr.ojai.store.impl.AbstractDocumentStream

isUsed

Constructor Summary

Constructors

Constructor and Description
RowkeyLookup(org.ojai.DocumentStream upstreamStream, SharedTable sharedTable, org.ojai.store.QueryCondition queryCond, org.ojai.FieldPath... fieldPaths) Constructor.

Method Summary

Modifier and Type	Method and Description
protected void	closeDerived() Perform whatever steps the derived class requires for closing.
void	getQueryPlan(java.util.List<java.util.Map<java.lang.String,java.lang.Object>> planList)
java.util.Iterator<org.ojai.Document>	iterator()
void	setDesiredRows(LongValue longValue) Provide a means for an element to query how many rows it would be desirable for it to produce at any given moment.

Methods inherited from class com.mapr.ojai.store.impl.AbstractDocumentFilter

getIndexUsed, getQueryPath, getQueryPlan

Methods inherited from class com.mapr.ojai.store.impl.AbstractDocumentStream

cancelQuery, checkState, close, documentReaders, isCanceled, isClosed, streamTo

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

MAX_BATCH_SIZE

public static final int MAX_BATCH_SIZE

Constructor Detail

RowkeyLookup

public RowkeyLookup(org.ojai.DocumentStream upstreamStream,
                    SharedTable sharedTable,
                    org.ojai.store.QueryCondition queryCond,
                    org.ojai.FieldPath... fieldPaths)

Constructor.

Parameters:

upstreamStream - the upstream document source

executorService - service to execute upstream source asynchronously

sharedTable - the table to do the rowkey lookups in

queryCond - query conditions to apply to records (may filter out records)

fieldPaths - projection fields, if any (may be null)

Method Detail

iterator

public java.util.Iterator<org.ojai.Document> iterator()

Specified by:

iterator in interface java.lang.Iterable<org.ojai.Document>

Specified by:

iterator in interface org.ojai.DocumentStream

Overrides:

iterator in class AbstractDocumentFilter

closeDerived

protected void closeDerived()

Description copied from class: AbstractDocumentStream

Perform whatever steps the derived class requires for closing. Note that the object's lock/monitor will be held, as this is called by the final synchronized AbstractDocumentStream.close() method.

Overrides:

closeDerived in class AbstractDocumentFilter

getQueryPlan

public void getQueryPlan(java.util.List<java.util.Map<java.lang.String,java.lang.Object>> planList)

setDesiredRows

public void setDesiredRows(LongValue longValue)

Description copied from interface: PipelineControl

Provide a means for an element to query how many rows it would be desirable for it to produce at any given moment. The returned value may change over time.

Specified by:

setDesiredRows in interface PipelineControl

Overrides:

setDesiredRows in class AbstractDocumentFilter

Parameters:

longValue - interface for requesting the currently desired number of rows