Package org.apache.druid.query.operator

Class AbstractPartitioningOperator.AbstractReceiver

java.lang.Object

org.apache.druid.query.operator.AbstractPartitioningOperator.AbstractReceiver

All Implemented Interfaces:

Operator.Receiver

Enclosing class:

AbstractPartitioningOperator

protected abstract static class AbstractPartitioningOperator.AbstractReceiver
extends Object
implements Operator.Receiver

Field Summary

Fields

Modifier and Type	Field	Description
protected final Operator.Receiver	delegate
protected final AtomicReference<Iterator<RowsAndColumns>>	iterHolder
protected final List<String>	partitionColumns

Constructor Summary

Constructors

Constructor	Description
AbstractReceiver(Operator.Receiver delegate, AtomicReference<Iterator<RowsAndColumns>> iterHolder, List<String> partitionColumns)

Method Summary

Modifier and Type	Method	Description
void	completed()	Used to indicate that no more data will ever come.
protected abstract Iterator<RowsAndColumns>	getIteratorForRAC(RowsAndColumns rac)
Operator.Signal	push(RowsAndColumns rac)	Used to push data.
protected Operator.Signal	pushPartition(RowsAndColumns partition, boolean isLastPartition, Operator.Signal previousSignal)

Methods inherited from class java.lang.Object

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

Field Details

delegate

protected final Operator.Receiver delegate

iterHolder

protected final AtomicReference<Iterator<RowsAndColumns>> iterHolder

partitionColumns

protected final List<String> partitionColumns

Constructor Details

AbstractReceiver

public AbstractReceiver(Operator.Receiver delegate,
 AtomicReference<Iterator<RowsAndColumns>> iterHolder,
 List<String> partitionColumns)

Method Details

push

public Operator.Signal push(RowsAndColumns rac)

Description copied from interface: Operator.Receiver

Used to push data. Return value indicates if more data will be accepted. If false, push should not be called anymore. If push is called after it returned false, undefined things will happen.

Specified by:

push in interface Operator.Receiver

Parameters:

rac - RowsAndColumns of data

Returns:

a boolean value indicating if more data will be accepted. If false, push should never be called anymore

completed

public void completed()

Description copied from interface: Operator.Receiver

Used to indicate that no more data will ever come. This is only used during the happy path and is not equivalent to a Closeable.close() method. Namely, there is no guarantee that this method will be called if execution halts due to an exception from push.

It is acceptable for an implementation to eagerly close resources from this method, but it is not acceptable for this method to be the sole method of managing the lifecycle of resources held by the Operator.

Specified by:

completed in interface Operator.Receiver

pushPartition

protected Operator.Signal pushPartition(RowsAndColumns partition,
 boolean isLastPartition,
 Operator.Signal previousSignal)

getIteratorForRAC

protected abstract Iterator<RowsAndColumns> getIteratorForRAC(RowsAndColumns rac)