Package org.apache.flink.runtime.io.network.api.reader

Class RecordReader<T extends org.apache.flink.core.io.IOReadableWritable>

java.lang.Object

org.apache.flink.runtime.io.network.api.reader.AbstractReader

org.apache.flink.runtime.io.network.api.reader.RecordReader<T>

Type Parameters:

T - Thy type of the records that is read.

All Implemented Interfaces:

Reader<T>, ReaderBase

public class RecordReader<T extends org.apache.flink.core.io.IOReadableWritable>
extends AbstractReader
implements Reader<T>

Record oriented reader for immutable types.

Field Summary

Fields inherited from class org.apache.flink.runtime.io.network.api.reader.AbstractReader

inputGate

Constructor Summary

Constructors

Constructor	Description
RecordReader(InputGate inputGate, Class<T> recordType, String[] tmpDirectories)	Creates a new RecordReader that de-serializes records from the given input gate and can spill partial records to disk, if they grow large.

Method Summary

Modifier and Type	Method	Description
void	clearBuffers()
protected boolean	getNextRecord(T target)
boolean	hasNext()
T	next()

Methods inherited from class org.apache.flink.runtime.io.network.api.reader.AbstractReader

handleEvent, hasReachedEndOfSuperstep, isFinished, publish, registerTaskEventListener, sendTaskEvent, setIterativeReader, startNextSuperstep

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.runtime.io.network.api.reader.ReaderBase

hasReachedEndOfSuperstep, isFinished, registerTaskEventListener, sendTaskEvent, setIterativeReader, startNextSuperstep

Constructor Details

RecordReader

public RecordReader(InputGate inputGate,
 Class<T> recordType,
 String[] tmpDirectories)

Creates a new RecordReader that de-serializes records from the given input gate and can spill partial records to disk, if they grow large.

Parameters:

inputGate - The input gate to read from.

tmpDirectories - The temp directories. USed for spilling if the reader concurrently reconstructs multiple large records.

Method Details

hasNext

public boolean hasNext()
                throws IOException,
InterruptedException

Specified by:

hasNext in interface Reader<T extends org.apache.flink.core.io.IOReadableWritable>

Throws:

IOException

InterruptedException

next

public T next()
       throws IOException,
InterruptedException

Specified by:

next in interface Reader<T extends org.apache.flink.core.io.IOReadableWritable>

Throws:

IOException

InterruptedException

clearBuffers

public void clearBuffers()

Specified by:

clearBuffers in interface Reader<T extends org.apache.flink.core.io.IOReadableWritable>

getNextRecord

protected boolean getNextRecord(T target)
                         throws IOException,
InterruptedException

Throws:

IOException

InterruptedException