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java.net
Class DatagramSocketImpl  

java.lang.Object
  java.net.DatagramSocketImpl

All Implemented Interfaces:

SocketOptions

Direct Known Subclasses:

PlainDatagramSocketImpl

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public abstract class DatagramSocketImpl

extends java.lang.Object

implements SocketOptions

This abstract class models a datagram socket implementation. An actual implementation class would implement these methods, probably via redirecting them to native code.

Written using on-line Java Platform 1.2 API Specification, as well as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).

Status: Believed complete and correct.

Since:

1.1

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Field Summary
protected  java.io.FileDescriptor	fd           The FileDescriptor object for this object.
protected  int	localPort           The local port to which this socket is bound

 

Fields inherited from interface java.net.SocketOptions

IP_MULTICAST_IF, IP_MULTICAST_IF2, IP_MULTICAST_LOOP, IP_TOS, SO_BINDADDR, SO_BROADCAST, SO_KEEPALIVE, SO_LINGER, SO_OOBINLINE, SO_RCVBUF, SO_REUSEADDR, SO_SNDBUF, SO_TIMEOUT, TCP_NODELAY

 

Constructor Summary

DatagramSocketImpl()           Default, no-argument constructor for subclasses to call.

 

Method Summary
protected abstract  void	bind(int lport, InetAddress laddr)           This method binds the socket to the specified local port and address.
protected abstract  void	close()           This methods closes the socket
protected  void	connect(InetAddress address, int port)           Connects the socket to a host specified by address and port.
protected abstract  void	create()           Creates a new datagram socket.
protected  void	disconnect()           Disconnects the socket.
protected  java.io.FileDescriptor	getFileDescriptor()           Returns the FileDescriptor for this socket
protected  int	getLocalPort()           Returns the local port this socket is bound to
protected abstract  int	getTimeToLive()           This method returns the current Time to Live (TTL) setting on this socket.
protected abstract  byte	getTTL()           Deprecated. // FIXME: when ?
protected abstract  void	join(InetAddress inetaddr)           Causes this socket to join the specified multicast group
protected abstract  void	joinGroup(SocketAddress mcastaddr, NetworkInterface netIf)           Causes this socket to join the specified multicast group on a specified device
protected abstract  void	leave(InetAddress inetaddr)           Causes the socket to leave the specified multicast group.
protected abstract  void	leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf)           Leaves a multicast group
protected abstract  int	peek(InetAddress i)           Takes a peek at the next packet received in order to retrieve the address of the sender
protected abstract  int	peekData(DatagramPacket p)           Takes a peek at the next packet received.
protected abstract  void	receive(DatagramPacket p)           Receives a packet of data from the network Will block until a packet arrives.
protected abstract  void	send(DatagramPacket p)           Transmits the specified packet of data to the network.
protected abstract  void	setTimeToLive(int ttl)           Sets the Time to Live (TTL) setting on this socket to the specified value.
protected abstract  void	setTTL(byte ttl)           Deprecated.

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface java.net.SocketOptions

getOption, setOption

 

Field Detail

localPort

protected int localPort

The local port to which this socket is bound

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fd

protected java.io.FileDescriptor fd

The FileDescriptor object for this object.

Constructor Detail

DatagramSocketImpl

public DatagramSocketImpl()

Default, no-argument constructor for subclasses to call.

Method Detail

bind

protected abstract void bind(int lport,
                             InetAddress laddr)
                      throws SocketException

This method binds the socket to the specified local port and address.

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close

protected abstract void close()

This methods closes the socket

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create

protected abstract void create()
                        throws SocketException

Creates a new datagram socket.

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peek

protected abstract int peek(InetAddress i)
                     throws java.io.IOException

Takes a peek at the next packet received in order to retrieve the address of the sender

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peekData

protected abstract int peekData(DatagramPacket p)
                         throws java.io.IOException

Takes a peek at the next packet received. This packet is not consumed. With the next peekData/receive operation this packet will be read again.

Since:

1.4

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send

protected abstract void send(DatagramPacket p)
                      throws java.io.IOException

Transmits the specified packet of data to the network. The destination host and port should be encoded in the packet.

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receive

protected abstract void receive(DatagramPacket p)
                         throws java.io.IOException

Receives a packet of data from the network Will block until a packet arrives. The packet info in populated into the passed in DatagramPacket object.

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connect

protected void connect(InetAddress address,
                       int port)
                throws SocketException

Connects the socket to a host specified by address and port.

Since:

1.4

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disconnect

protected void disconnect()

Disconnects the socket.

Since:

1.4

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setTTL

protected abstract void setTTL(byte ttl)
                        throws java.io.IOException

Deprecated.  

Sets the Time to Live (TTL) setting on this socket to the specified value. Use setTimeToLive(int) instead.

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getTTL

protected abstract byte getTTL()
                        throws java.io.IOException

Deprecated. // FIXME: when ?

This method returns the current Time to Live (TTL) setting on this socket. Use getTimeToLive() instead.

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setTimeToLive

protected abstract void setTimeToLive(int ttl)
                               throws java.io.IOException

Sets the Time to Live (TTL) setting on this socket to the specified value.

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getTimeToLive

protected abstract int getTimeToLive()
                              throws java.io.IOException

This method returns the current Time to Live (TTL) setting on this socket.

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join

protected abstract void join(InetAddress inetaddr)
                      throws java.io.IOException

Causes this socket to join the specified multicast group

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leave

protected abstract void leave(InetAddress inetaddr)
                       throws java.io.IOException

Causes the socket to leave the specified multicast group.

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joinGroup

protected abstract void joinGroup(SocketAddress mcastaddr,
                                  NetworkInterface netIf)
                           throws java.io.IOException

Causes this socket to join the specified multicast group on a specified device

Since:

1.4

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leaveGroup

protected abstract void leaveGroup(SocketAddress mcastaddr,
                                   NetworkInterface netIf)
                            throws java.io.IOException

Leaves a multicast group

Since:

1.4

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getFileDescriptor

protected java.io.FileDescriptor getFileDescriptor()

Returns the FileDescriptor for this socket

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getLocalPort

protected int getLocalPort()

Returns the local port this socket is bound to

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