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java.lang.Objectjava.net.DatagramSocketImpl
public abstract class DatagramSocketImpl
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.
Field Summary | |
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protected 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 |
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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 | |
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DatagramSocketImpl()
Default, no-argument constructor for subclasses to call. |
Method Summary | |
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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 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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface java.net.SocketOptions |
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getOption, setOption |
Field Detail |
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protected int localPort
protected FileDescriptor fd
Constructor Detail |
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public DatagramSocketImpl()
Method Detail |
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protected abstract void bind(int lport, InetAddress laddr) throws SocketException
lport
- The port number to bind toladdr
- The address to bind to
SocketException
- If an error occursprotected abstract void close()
protected abstract void create() throws SocketException
SocketException
- If an error occursprotected abstract int peek(InetAddress i) throws IOException
i
- The InetAddress
to fill in with the information
about the sender if the next packet
IOException
- If an error 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.protected abstract int peekData(DatagramPacket p) throws IOException
p
- The DatagramPacket
to fill in with the data sent.
IOException
- If an error 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.protected abstract void send(DatagramPacket p) throws IOException
p
- The packet to send
IOException
- If an error 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.protected abstract void receive(DatagramPacket p) throws IOException
DatagramPacket
object.
p
- A place to store the incoming packet.
IOException
- If an error 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.protected void connect(InetAddress address, int port) throws SocketException
address
- The InetAddress
of the host to connect toport
- The port number of the host to connect to
SocketException
- If an error occursprotected void disconnect()
protected abstract void setTTL(byte ttl) throws IOException
setTimeToLive(int)
instead.
ttl
- The new Time to Live value
IOException
- If an error occursprotected abstract byte getTTL() throws IOException
getTimeToLive()
instead.
IOException
- If an error occursprotected abstract void setTimeToLive(int ttl) throws IOException
ttl
- The new Time to Live value
IOException
- If an error occursprotected abstract int getTimeToLive() throws IOException
IOException
- If an error occursprotected abstract void join(InetAddress inetaddr) throws IOException
inetaddr
- The multicast address to join with
IOException
- If an error occursprotected abstract void leave(InetAddress inetaddr) throws IOException
inetaddr
- The multicast address to leave
IOException
- If an error occursprotected abstract void joinGroup(SocketAddress mcastaddr, NetworkInterface netIf) throws IOException
mcastaddr
- The address to leavenetIf
- The specified network interface to join the group at
IOException
- If an error occursprotected abstract void leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf) throws IOException
mcastaddr
- The address to joinnetIf
- The specified network interface to leave the group at
IOException
- If an error occursprotected FileDescriptor getFileDescriptor()
protected int getLocalPort()
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