de.ruedigermoeller.fastcast.transport

Class SharedMemTransport

java.lang.Object

de.ruedigermoeller.fastcast.transport.SharedMemTransport

All Implemented Interfaces:

Transport

public class SharedMemTransport
extends Object
implements Transport

a shared memory transport implementation using public API (no unsafe or dirty hacks). It uses memory mapped files and filechannel.lock to synchronize concurrent access. Latency (datagramsize lesser 1000, lowlat config) is 6-7 microseconds on i7/win8, ~12 micros on AMD opteron 2.2Ghz/CentOS. Throughput is 30% higher compared to local host socket (as long decoding is not the limiting factor). Latency has less jitter and is ~ twice as low compared to local host multicast socket.

Constructor Summary

Constructors

Constructor and Description
SharedMemTransport(FCSocketConf c)
SharedMemTransport(String path, int datagramsiz, int buffsiz)

Method Summary

Methods

Modifier and Type	Method and Description
FCSocketConf	getConf()
long	getPack(long index)
int	getPackOff(long index)
protected void	initMemMap(String filePath, int siz)
void	join()
static void	main(String[] arg)
boolean	receive(DatagramPacket pack)
void	send(DatagramPacket pack)
boolean	tryRead(byte[] b, int off)
void	write(byte[] b, int off, int len)

Methods inherited from class java.lang.Object

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

Constructor Detail

SharedMemTransport

public SharedMemTransport(FCSocketConf c)

SharedMemTransport

public SharedMemTransport(String path,
                  int datagramsiz,
                  int buffsiz)

Method Detail

getPack

public long getPack(long index)

getPackOff

public int getPackOff(long index)

write

public void write(byte[] b,
         int off,
         int len)

tryRead

public boolean tryRead(byte[] b,
              int off)

initMemMap

protected void initMemMap(String filePath,
              int siz)
                   throws IOException,
                          NoSuchFieldException,
                          IllegalAccessException

Throws:

IOException

NoSuchFieldException

IllegalAccessException

receive

public boolean receive(DatagramPacket pack)
                throws IOException

Specified by:

receive in interface Transport

Throws:

IOException

send

public void send(DatagramPacket pack)
          throws IOException

Specified by:

send in interface Transport

Throws:

IOException

join

public void join()
          throws IOException

Specified by:

join in interface Transport

Throws:

IOException

getConf

public FCSocketConf getConf()

Specified by:

getConf in interface Transport

main

public static void main(String[] arg)
                 throws Exception

Throws:

Exception