- java.lang.Object
-
- java.net.SocketImpl
-
- All Implemented Interfaces:
- SocketOptions
public abstract class SocketImpl extends Object implements SocketOptions
The abstract classSocketImpl
is a common superclass of all classes that actually implement sockets. It is used to create both client and server sockets.A "plain" socket implements these methods exactly as described, without attempting to go through a firewall or proxy.
- Since:
- JDK1.0
-
-
Field Summary
Fields Modifier and Type Field and Description protected InetAddress
address
The IP address of the remote end of this socket.protected FileDescriptor
fd
The file descriptor object for this socket.protected int
localport
The local port number to which this socket is connected.protected int
port
The port number on the remote host to which this socket is connected.-
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
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-
Constructor Summary
Constructors Constructor and Description SocketImpl()
-
Method Summary
Methods Modifier and Type Method and Description protected abstract void
accept(SocketImpl s)
Accepts a connection.protected abstract int
available()
Returns the number of bytes that can be read from this socket without blocking.protected abstract void
bind(InetAddress host, int port)
Binds this socket to the specified local IP address and port number.protected abstract void
close()
Closes this socket.protected abstract void
connect(InetAddress address, int port)
Connects this socket to the specified port number on the specified host.protected abstract void
connect(SocketAddress address, int timeout)
Connects this socket to the specified port number on the specified host.protected abstract void
connect(String host, int port)
Connects this socket to the specified port on the named host.protected abstract void
create(boolean stream)
Creates either a stream or a datagram socket.protected FileDescriptor
getFileDescriptor()
Returns the value of this socket'sfd
field.protected InetAddress
getInetAddress()
Returns the value of this socket'saddress
field.protected abstract InputStream
getInputStream()
Returns an input stream for this socket.protected int
getLocalPort()
Returns the value of this socket'slocalport
field.protected abstract OutputStream
getOutputStream()
Returns an output stream for this socket.protected int
getPort()
Returns the value of this socket'sport
field.protected abstract void
listen(int backlog)
Sets the maximum queue length for incoming connection indications (a request to connect) to thecount
argument.protected abstract void
sendUrgentData(int data)
Send one byte of urgent data on the socket.protected void
setPerformancePreferences(int connectionTime, int latency, int bandwidth)
Sets performance preferences for this socket.protected void
shutdownInput()
Places the input stream for this socket at "end of stream".protected void
shutdownOutput()
Disables the output stream for this socket.protected boolean
supportsUrgentData()
Returns whether or not this SocketImpl supports sending urgent data.String
toString()
Returns the address and port of this socket as aString
.
-
-
-
Field Detail
-
fd
protected FileDescriptor fd
The file descriptor object for this socket.
-
address
protected InetAddress address
The IP address of the remote end of this socket.
-
port
protected int port
The port number on the remote host to which this socket is connected.
-
localport
protected int localport
The local port number to which this socket is connected.
-
-
Method Detail
-
create
protected abstract void create(boolean stream) throws IOException
Creates either a stream or a datagram socket.- Parameters:
stream
- iftrue
, create a stream socket; otherwise, create a datagram socket.- Throws:
IOException
- if an I/O error occurs while creating the socket.
-
connect
protected abstract void connect(String host, int port) throws IOException
Connects this socket to the specified port on the named host.- Parameters:
host
- the name of the remote host.port
- the port number.- Throws:
IOException
- if an I/O error occurs when connecting to the remote host.
-
connect
protected abstract void connect(InetAddress address, int port) throws IOException
Connects this socket to the specified port number on the specified host.- Parameters:
address
- the IP address of the remote host.port
- the port number.- Throws:
IOException
- if an I/O error occurs when attempting a connection.
-
connect
protected abstract void connect(SocketAddress address, int timeout) throws IOException
Connects this socket to the specified port number on the specified host. A timeout of zero is interpreted as an infinite timeout. The connection will then block until established or an error occurs.- Parameters:
address
- the Socket address of the remote host.timeout
- the timeout value, in milliseconds, or zero for no timeout.- Throws:
IOException
- if an I/O error occurs when attempting a connection.- Since:
- 1.4
-
bind
protected abstract void bind(InetAddress host, int port) throws IOException
Binds this socket to the specified local IP address and port number.- Parameters:
host
- an IP address that belongs to a local interface.port
- the port number.- Throws:
IOException
- if an I/O error occurs when binding this socket.
-
listen
protected abstract void listen(int backlog) throws IOException
Sets the maximum queue length for incoming connection indications (a request to connect) to thecount
argument. If a connection indication arrives when the queue is full, the connection is refused.- Parameters:
backlog
- the maximum length of the queue.- Throws:
IOException
- if an I/O error occurs when creating the queue.
-
accept
protected abstract void accept(SocketImpl s) throws IOException
Accepts a connection.- Parameters:
s
- the accepted connection.- Throws:
IOException
- if an I/O error occurs when accepting the connection.
-
getInputStream
protected abstract InputStream getInputStream() throws IOException
Returns an input stream for this socket.- Returns:
- a stream for reading from this socket.
- Throws:
IOException
- if an I/O error occurs when creating the input stream.
-
getOutputStream
protected abstract OutputStream getOutputStream() throws IOException
Returns an output stream for this socket.- Returns:
- an output stream for writing to this socket.
- Throws:
IOException
- if an I/O error occurs when creating the output stream.
-
available
protected abstract int available() throws IOException
Returns the number of bytes that can be read from this socket without blocking.- Returns:
- the number of bytes that can be read from this socket without blocking.
- Throws:
IOException
- if an I/O error occurs when determining the number of bytes available.
-
close
protected abstract void close() throws IOException
Closes this socket.- Throws:
IOException
- if an I/O error occurs when closing this socket.
-
shutdownInput
protected void shutdownInput() throws IOException
Places the input stream for this socket at "end of stream". Any data sent to this socket is acknowledged and then silently discarded. If you read from a socket input stream after invoking shutdownInput() on the socket, the stream will return EOF.- Throws:
IOException
- if an I/O error occurs when shutting down this socket.- Since:
- 1.3
- See Also:
Socket.shutdownOutput()
,Socket.close()
,Socket.setSoLinger(boolean, int)
-
shutdownOutput
protected void shutdownOutput() throws IOException
Disables the output stream for this socket. For a TCP socket, any previously written data will be sent followed by TCP's normal connection termination sequence. If you write to a socket output stream after invoking shutdownOutput() on the socket, the stream will throw an IOException.- Throws:
IOException
- if an I/O error occurs when shutting down this socket.- Since:
- 1.3
- See Also:
Socket.shutdownInput()
,Socket.close()
,Socket.setSoLinger(boolean, int)
-
getFileDescriptor
protected FileDescriptor getFileDescriptor()
Returns the value of this socket'sfd
field.- Returns:
- the value of this socket's
fd
field. - See Also:
fd
-
getInetAddress
protected InetAddress getInetAddress()
Returns the value of this socket'saddress
field.- Returns:
- the value of this socket's
address
field. - See Also:
address
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getPort
protected int getPort()
Returns the value of this socket'sport
field.- Returns:
- the value of this socket's
port
field. - See Also:
port
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supportsUrgentData
protected boolean supportsUrgentData()
Returns whether or not this SocketImpl supports sending urgent data. By default, false is returned unless the method is overridden in a sub-class- Returns:
- true if urgent data supported
- Since:
- 1.4
- See Also:
address
-
sendUrgentData
protected abstract void sendUrgentData(int data) throws IOException
Send one byte of urgent data on the socket. The byte to be sent is the low eight bits of the parameter- Parameters:
data
- The byte of data to send- Throws:
IOException
- if there is an error sending the data.- Since:
- 1.4
-
getLocalPort
protected int getLocalPort()
Returns the value of this socket'slocalport
field.- Returns:
- the value of this socket's
localport
field. - See Also:
localport
-
toString
public String toString()
Returns the address and port of this socket as aString
.
-
setPerformancePreferences
protected void setPerformancePreferences(int connectionTime, int latency, int bandwidth)
Sets performance preferences for this socket.Sockets use the TCP/IP protocol by default. Some implementations may offer alternative protocols which have different performance characteristics than TCP/IP. This method allows the application to express its own preferences as to how these tradeoffs should be made when the implementation chooses from the available protocols.
Performance preferences are described by three integers whose values indicate the relative importance of short connection time, low latency, and high bandwidth. The absolute values of the integers are irrelevant; in order to choose a protocol the values are simply compared, with larger values indicating stronger preferences. Negative values represent a lower priority than positive values. If the application prefers short connection time over both low latency and high bandwidth, for example, then it could invoke this method with the values (1, 0, 0). If the application prefers high bandwidth above low latency, and low latency above short connection time, then it could invoke this method with the values (0, 1, 2). By default, this method does nothing, unless it is overridden in a a sub-class.
- Parameters:
connectionTime
- An int expressing the relative importance of a short connection timelatency
- An int expressing the relative importance of low latencybandwidth
- An int expressing the relative importance of high bandwidth- Since:
- 1.5
-
-
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