org.simpleflatmapper.util

Class ParallelReader

java.lang.Object

java.io.Reader

org.simpleflatmapper.util.ParallelReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class ParallelReader
extends Reader

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ParallelReader.WaitingStrategy

Constructor Summary

Constructors

Constructor and Description
ParallelReader(Reader reader) Create a new ParallelReader that will fetch the data from that reader in a another thread.
ParallelReader(Reader reader, Executor executorService)
ParallelReader(Reader reader, Executor executorService, int bufferSize)
ParallelReader(Reader reader, Executor executorService, int bufferSize, int readBufferSize)
ParallelReader(Reader reader, Executor executorService, int bufferSize, int readBufferSize, ParallelReader.WaitingStrategy waitingStrategy) Create a new ParallelReader.

Method Summary

Modifier and Type	Method and Description
void	close()
static Executor	getDefaultExecutor()
int	read()
int	read(char[] cbuf, int off, int len)

Methods inherited from class java.io.Reader

mark, markSupported, read, read, ready, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

ParallelReader

public ParallelReader(Reader reader)

Create a new ParallelReader that will fetch the data from that reader in a another thread. By default it will use the ForkJoinPool common pool from java8 or a ExecutorService with a pool size set to the number of available cores. If the number of cores is 1 it will create a new Thread everytime. The default WaitingStrategy just call LockSupport.parkNanos(1l);

Parameters:

reader - the reader

ParallelReader

public ParallelReader(Reader reader,
                      Executor executorService)

ParallelReader

public ParallelReader(Reader reader,
                      Executor executorService,
                      int bufferSize)

ParallelReader

public ParallelReader(Reader reader,
                      Executor executorService,
                      int bufferSize,
                      int readBufferSize)

ParallelReader

public ParallelReader(Reader reader,
                      Executor executorService,
                      int bufferSize,
                      int readBufferSize,
                      ParallelReader.WaitingStrategy waitingStrategy)

Create a new ParallelReader.

Parameters:

reader - the reader

executorService - the executor to fetch from

bufferSize - the size of the ring buffer

readBufferSize - the size of the buffer to fetch data

waitingStrategy - the waiting strategy when the ring buffer is full

Method Detail

getDefaultExecutor

public static Executor getDefaultExecutor()

read

public int read()
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

read

public int read(char[] cbuf,
                int off,
                int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class Reader

Throws:

IOException