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java.net
Class DatagramSocketImpl
java.lang.Object
java.net.DatagramSocketImpl
-
All Implemented Interfaces:
-
SocketOptions
-
public abstract class DatagramSocketImpl
- extends Object
- implements SocketOptions
Abstract datagram and multicast socket implementation base class.
-
Since:
-
JDK1.1
Field Summary
|
protected
FileDescriptor
|
fd
The file descriptor object. |
protected int |
localPort
The local port number. |
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
|
Method Summary
|
protected abstract void |
bind
(int lport,
InetAddress
laddr)
Binds a datagram socket to a local port and address. |
protected abstract void |
close
()
Close the socket. |
protected void |
connect
(
InetAddress
address, int port)
Connects a datagram socket to a remote destination. |
protected abstract void |
create
()
Creates a datagram socket. |
protected void |
disconnect
()
Disconnects a datagram socket from its remote destination. |
protected
FileDescriptor
|
getFileDescriptor
()
Gets the datagram socket file descriptor. |
protected int |
getLocalPort
()
Gets the local port. |
protected abstract int |
getTimeToLive
()
Retrieve the TTL (time-to-live) option. |
protected abstract byte |
getTTL
()
Deprecated.
use getTimeToLive instead.
|
protected abstract void |
join
(
InetAddress
inetaddr)
Join the multicast group. |
protected abstract void |
joinGroup
(
SocketAddress
mcastaddr,
NetworkInterface
netIf)
Join the multicast group. |
protected abstract void |
leave
(
InetAddress
inetaddr)
Leave the multicast group. |
protected abstract void |
leaveGroup
(
SocketAddress
mcastaddr,
NetworkInterface
netIf)
Leave the multicast group. |
protected abstract int |
peek
(
InetAddress
i)
Peek at the packet to see who it is from. |
protected abstract int |
peekData
(
DatagramPacket
p)
Peek at the packet to see who it is from. |
protected abstract void |
receive
(
DatagramPacket
p)
Receive the datagram packet. |
protected abstract void |
send
(
DatagramPacket
p)
Sends a datagram packet. |
protected abstract void |
setTimeToLive
(int ttl)
Set the TTL (time-to-live) option. |
protected abstract void |
setTTL
(byte ttl)
Deprecated.
use setTimeToLive instead.
|
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
|
localPort
protected int localPort
-
The local port number.
fd
protected FileDescriptor fd
-
The file descriptor object.
DatagramSocketImpl
public DatagramSocketImpl()
create
protected abstract void create()
throws SocketException
-
Creates a datagram socket.
-
-
-
Throws:
-
SocketException
- if there is an error in the underlying protocol, such as a TCP error.
bind
protected abstract void bind(int lport,
InetAddress laddr)
throws SocketException
-
Binds a datagram socket to a local port and address.
-
-
-
Parameters:
-
lport - the local port
-
laddr - the local address
-
Throws:
-
SocketException
- if there is an error in the underlying protocol, such as a TCP error.
send
protected abstract void send(DatagramPacket p)
throws IOException
-
Sends a datagram packet. The packet contains the data and the destination address to send the packet to.
-
-
-
Parameters:
-
p - the packet to be sent.
-
Throws:
-
IOException
- if an I/O exception occurs while sending the datagram packet.
-
PortUnreachableException
- may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
connect
protected void connect(InetAddress address,
int port)
throws SocketException
-
Connects a datagram socket to a remote destination. This associates the remote address with the local socket so that datagrams may only be sent to this destination and received from this destination. This may be overridden to call a native system connect.
If the remote destination to which the socket is connected does not exist, or is otherwise unreachable, and if an ICMP destination unreachable packet has been received for that address, then a subsequent call to send or receive may throw a PortUnreachableException. Note, there is no guarantee that the exception will be thrown.
-
-
-
Parameters:
-
address - the remote InetAddress to connect to
-
port - the remote port number
-
Throws:
-
SocketException
- may be thrown if the socket cannot be connected to the remote destination
-
Since:
-
1.4
disconnect
protected void disconnect()
-
Disconnects a datagram socket from its remote destination.
-
-
-
Since:
-
1.4
peek
protected abstract int peek(InetAddress i)
throws IOException
-
Peek at the packet to see who it is from.
-
-
-
Parameters:
-
i - an InetAddress object
-
Returns:
-
the address which the packet came from.
-
Throws:
-
IOException
- if an I/O exception occurs
-
PortUnreachableException
- may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
peekData
protected abstract int peekData(DatagramPacket p)
throws IOException
-
Peek at the packet to see who it is from. The data is returned, but not consumed, so that a subsequent peekData/receive operation will see the same data.
-
-
-
Parameters:
-
p - the Packet Received.
-
Returns:
-
the address which the packet came from.
-
Throws:
-
IOException
- if an I/O exception occurs
-
PortUnreachableException
- may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
-
Since:
-
1.4
receive
protected abstract void receive(DatagramPacket p)
throws IOException
-
Receive the datagram packet.
-
-
-
Parameters:
-
p - the Packet Received.
-
Throws:
-
IOException
- if an I/O exception occurs while receiving the datagram packet.
-
PortUnreachableException
- may be thrown if the socket is connected to a currently unreachable destination. Note, there is no guarantee that the exception will be thrown.
setTTL
@Deprecated
protected abstract void setTTL(byte ttl)
throws IOException
-
Deprecated.
use setTimeToLive instead.
-
Set the TTL (time-to-live) option.
-
-
-
Parameters:
-
ttl - a byte specifying the TTL value
-
Throws:
-
IOException
- if an I/O exception occurs while setting the time-to-live option.
-
See Also:
-
getTTL()
getTTL
@Deprecated
protected abstract byte getTTL()
throws IOException
-
Deprecated.
use getTimeToLive instead.
-
Retrieve the TTL (time-to-live) option.
-
-
-
Returns:
-
a byte representing the TTL value
-
Throws:
-
IOException
- if an I/O exception occurs while retrieving the time-to-live option
-
See Also:
-
setTTL(byte)
setTimeToLive
protected abstract void setTimeToLive(int ttl)
throws IOException
-
Set the TTL (time-to-live) option.
-
-
-
Parameters:
-
ttl - an
int
specifying the time-to-live value
-
Throws:
-
IOException
- if an I/O exception occurs while setting the time-to-live option.
-
See Also:
-
getTimeToLive()
getTimeToLive
protected abstract int getTimeToLive()
throws IOException
-
Retrieve the TTL (time-to-live) option.
-
-
-
Returns:
-
an
int
representing the time-to-live value
-
Throws:
-
IOException
- if an I/O exception occurs while retrieving the time-to-live option
-
See Also:
-
setTimeToLive(int)
join
protected abstract void join(InetAddress inetaddr)
throws IOException
-
Join the multicast group.
-
-
-
Parameters:
-
inetaddr - multicast address to join.
-
Throws:
-
IOException
- if an I/O exception occurs while joining the multicast group.
leave
protected abstract void leave(InetAddress inetaddr)
throws IOException
-
Leave the multicast group.
-
-
-
Parameters:
-
inetaddr - multicast address to leave.
-
Throws:
-
IOException
- if an I/O exception occurs while leaving the multicast group.
joinGroup
protected abstract void joinGroup(SocketAddress mcastaddr,
NetworkInterface netIf)
throws IOException
-
Join the multicast group.
-
-
-
Parameters:
-
mcastaddr - address to join.
-
netIf - specifies the local interface to receive multicast datagram packets
-
Throws:
-
IOException
- if an I/O exception occurs while joining the multicast group
-
Since:
-
1.4
leaveGroup
protected abstract void leaveGroup(SocketAddress mcastaddr,
NetworkInterface netIf)
throws IOException
-
Leave the multicast group.
-
-
-
Parameters:
-
mcastaddr - address to leave.
-
netIf - specified the local interface to leave the group at
-
Throws:
-
IOException
- if an I/O exception occurs while leaving the multicast group
-
Since:
-
1.4
close
protected abstract void close()
-
Close the socket.
-
-
getLocalPort
protected int getLocalPort()
-
Gets the local port.
-
-
-
Returns:
-
an
int
representing the local port value
getFileDescriptor
protected FileDescriptor getFileDescriptor()
-
Gets the datagram socket file descriptor.
-
-
-
Returns:
-
a
FileDescriptor
object representing the datagram socket file descriptor