Module jdk.net

Package jdk.net

Class ExtendedSocketOptions

java.lang.Object

jdk.net.ExtendedSocketOptions

public final class ExtendedSocketOptions
extends Object

Defines extended socket options, beyond those defined in StandardSocketOptions. These options may be platform specific.

Since:

1.8

Field Summary

Fields

Modifier and Type	Field	Description
static SocketOption<SocketFlow>	SO_FLOW_SLA	Deprecated, for removal: This API element is subject to removal in a future version. This is supported only on Solaris.
static SocketOption<Integer>	TCP_KEEPCOUNT	Keep-Alive retransmission maximum limit.
static SocketOption<Integer>	TCP_KEEPIDLE	Keep-Alive idle time.
static SocketOption<Integer>	TCP_KEEPINTERVAL	Keep-Alive retransmission interval time.
static SocketOption<Boolean>	TCP_QUICKACK	Disable Delayed Acknowledgements.

Method Summary

Methods declared in class java.lang.Object

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

Field Details

SO_FLOW_SLA

@Deprecated(since="14", forRemoval=true) public static final SocketOption<SocketFlow> SO_FLOW_SLA

Deprecated, for removal: This API element is subject to removal in a future version.

This is supported only on Solaris. Due to deprecation of Solaris port, this option is also deprecated.

Service level properties. When a security manager is installed, setting or getting this option requires a NetworkPermission ("setOption.SO_FLOW_SLA") or "getOption.SO_FLOW_SLA" respectively.

TCP_QUICKACK

public static final SocketOption<Boolean> TCP_QUICKACK

Disable Delayed Acknowledgements.

This socket option can be used to reduce or disable delayed acknowledgments (ACKs). When TCP_QUICKACK is enabled, ACKs are sent immediately, rather than delayed if needed in accordance to normal TCP operation. This option is not permanent, it only enables a switch to or from TCP_QUICKACK mode. Subsequent operations of the TCP protocol will once again disable/enable TCP_QUICKACK mode depending on internal protocol processing and factors such as delayed ACK timeouts occurring and data transfer, therefore this option needs to be set with setOption after each operation of TCP on a given socket.

The value of this socket option is a Boolean that represents whether the option is enabled or disabled. The socket option is specific to stream-oriented sockets using the TCP/IP protocol. The exact semantics of this socket option are socket type and system dependent.

Since:

10

TCP_KEEPIDLE

public static final SocketOption<Integer> TCP_KEEPIDLE

Keep-Alive idle time.

The value of this socket option is an Integer that is the number of seconds of idle time before keep-alive initiates a probe. The socket option is specific to stream-oriented sockets using the TCP/IP protocol. The exact semantics of this socket option are system dependent.

When the SO_KEEPALIVE option is enabled, TCP probes a connection that has been idle for some amount of time. The default value for this idle period is system dependent, but is typically 2 hours. The TCP_KEEPIDLE option can be used to affect this value for a given socket.

Since:

11

TCP_KEEPINTERVAL

public static final SocketOption<Integer> TCP_KEEPINTERVAL

Keep-Alive retransmission interval time.

The value of this socket option is an Integer that is the number of seconds to wait before retransmitting a keep-alive probe. The socket option is specific to stream-oriented sockets using the TCP/IP protocol. The exact semantics of this socket option are system dependent.

When the SO_KEEPALIVE option is enabled, TCP probes a connection that has been idle for some amount of time. If the remote system does not respond to a keep-alive probe, TCP retransmits the probe after some amount of time. The default value for this retransmission interval is system dependent, but is typically 75 seconds. The TCP_KEEPINTERVAL option can be used to affect this value for a given socket.

Since:

11

TCP_KEEPCOUNT

public static final SocketOption<Integer> TCP_KEEPCOUNT

Keep-Alive retransmission maximum limit.

The value of this socket option is an Integer that is the maximum number of keep-alive probes to be sent. The socket option is specific to stream-oriented sockets using the TCP/IP protocol. The exact semantics of this socket option are system dependent.

When the SO_KEEPALIVE option is enabled, TCP probes a connection that has been idle for some amount of time. If the remote system does not respond to a keep-alive probe, TCP retransmits the probe a certain number of times before a connection is considered to be broken. The default value for this keep-alive probe retransmit limit is system dependent, but is typically 8. The TCP_KEEPCOUNT option can be used to affect this value for a given socket.

Since:

11