org.aksw.jena_sparql_api.io.endpoint

Class ConcurrentFileReader

java.lang.Object

org.aksw.jena_sparql_api.io.endpoint.ConcurrentFileReader

All Implemented Interfaces:

Closeable, AutoCloseable, Channel, ReadableByteChannel

public class ConcurrentFileReader
extends Object
implements ReadableByteChannel

A wrapper for a channel that blocks upon reaching the end of its channel When there is no more data, the reader can either waits for a notify on referenceChannel. or a poll using a specified interval. The reference channel may be a channel that actually written to by the JVM, but it may also be just a 'dummy' channel that represents a write process outside of the JVM, such as a system process.

Author:

raven

Field Summary

Fields

Modifier and Type	Field and Description
protected SeekableByteChannel	currentReadChannel
protected Integer	pollIntervalInMs
protected Channel	referenceChannel

Constructor Summary

Constructors

Constructor and Description
ConcurrentFileReader(Channel writeChannel, SeekableByteChannel currentReadChannel, Integer pollIntervalInMs)

Method Summary

Modifier and Type	Method and Description
void	close()
static ConcurrentFileReader	create(Path path, Channel writeChannel, Integer pollIntervalInMs)
boolean	isAborted()
boolean	isOpen()
int	read(ByteBuffer dst) Read method that blocks if no data is available but the write channel is still open

Methods inherited from class java.lang.Object

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

Field Detail

referenceChannel

protected Channel referenceChannel

currentReadChannel

protected SeekableByteChannel currentReadChannel

pollIntervalInMs

protected Integer pollIntervalInMs

Constructor Detail

ConcurrentFileReader

public ConcurrentFileReader(Channel writeChannel,
                            SeekableByteChannel currentReadChannel,
                            Integer pollIntervalInMs)

Method Detail

create

public static ConcurrentFileReader create(Path path,
                                          Channel writeChannel,
                                          Integer pollIntervalInMs)
                                   throws IOException

Parameters:

path -

writeChannel -

pollIntervalInMs - Poll interval value or null in order to wait for notify on reference channel

Returns:

Throws:

IOException

isOpen

public boolean isOpen()

Specified by:

isOpen in interface Channel

isAborted

public boolean isAborted()

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Channel

Throws:

IOException

read

public int read(ByteBuffer dst)
         throws IOException

Read method that blocks if no data is available but the write channel is still open

Specified by:

read in interface ReadableByteChannel

Throws:

IOException