Package com.sun.enterprise.mgmt.transport

Class NetworkUtility

java.lang.Object

com.sun.enterprise.mgmt.transport.NetworkUtility

public class NetworkUtility
extends Object

Utility class that can be used by any calling code to do common routines about Network I/O

Author:

Bongjae Chang

Field Summary

Fields

Modifier and Type	Field	Description
static List<InetAddress>	allLocalAddresses
static InetAddress	ANYADDRESS	Constant which works as the IP "Any Address" value
static InetAddress	ANYADDRESSV4
static InetAddress	ANYADDRESSV6
static InetAddress	firstInetAddressV4
static InetAddress	firstInetAddressV6
static String	IPV4ANYADDRESS
static String	IPV4LOOPBACK
static String	IPV6ANYADDRESS
static String	IPV6LOOPBACK
static InetAddress	LOOPBACK	Constant which works as the IP "Local Loopback" value;
static InetAddress	LOOPBACKV4
static InetAddress	LOOPBACKV6

Constructor Summary

Constructors

Constructor	Description
NetworkUtility()

Method Summary

Modifier and Type	Method	Description
static void	deserialize(InputStream is, int count, Map<String,Serializable> messages)
static List<InetAddress>	getAllLocalAddresses()	Returns all local addresses except for lookback and any local address But, if any addresses were not found locally, the lookback is added to the list.
static InetAddress	getAnyAddress()
static InetAddress	getFirstInetAddress()	Return a first InetAddress of the first network interface check java property java.net.preferIPv6Addresses for whether to favor IPv4 or IPv6.
static InetAddress	getFirstInetAddress(boolean preferIPv6)	Return a first InetAddress of the first network interface But, if any network interfaces were not found locally, null could be returned.
static NetworkInterface	getFirstNetworkInterface(boolean preferIPv6)	Return a first network interface except for the lookback But, if any network interfaces were not found locally, the lookback interface is returned.
static int	getIntFromByteArray(byte[] bytes, int offset)
static InetAddress	getLocalHostAddress()
static InetAddress	getLoopbackAddress()
static InetAddress	getNetworkInetAddress(NetworkInterface anInterface, boolean preferIPv6)	Return a first InetAddress of network interface But, if any network interfaces were not found locally, null could be returned.
static boolean	getPreferIpv6Addresses()
static boolean	isBindAddressValid(String addressString)
static boolean	isLoopbackNetworkInterface(NetworkInterface anInterface)
static boolean	isUp(NetworkInterface anInterface)
static void	main(String[] args)
static InetAddress	resolveBindInterfaceName(String addressString)
static int	serialize(OutputStream baos, Map<String,Serializable> messages)
static boolean	supportsMulticast(NetworkInterface anInterface)
static void	writeIntToByteArray(byte[] bytes, int offset, int value)

Methods inherited from class java.lang.Object

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

Field Detail

IPV4ANYADDRESS

public static final String IPV4ANYADDRESS

See Also:

Constant Field Values

IPV6ANYADDRESS

public static final String IPV6ANYADDRESS

See Also:

Constant Field Values

IPV4LOOPBACK

public static final String IPV4LOOPBACK

See Also:

Constant Field Values

IPV6LOOPBACK

public static final String IPV6LOOPBACK

See Also:

Constant Field Values

ANYADDRESS

public static final InetAddress ANYADDRESS

Constant which works as the IP "Any Address" value

ANYADDRESSV4

public static final InetAddress ANYADDRESSV4

ANYADDRESSV6

public static final InetAddress ANYADDRESSV6

LOOPBACK

public static final InetAddress LOOPBACK

Constant which works as the IP "Local Loopback" value;

LOOPBACKV4

public static final InetAddress LOOPBACKV4

LOOPBACKV6

public static final InetAddress LOOPBACKV6

allLocalAddresses

public static volatile List<InetAddress> allLocalAddresses

firstInetAddressV4

public static volatile InetAddress firstInetAddressV4

firstInetAddressV6

public static volatile InetAddress firstInetAddressV6

Constructor Detail

NetworkUtility

public NetworkUtility()

Method Detail

getAllLocalAddresses

public static List<InetAddress> getAllLocalAddresses()

Returns all local addresses except for lookback and any local address But, if any addresses were not found locally, the lookback is added to the list.

Returns:

List which contains available addresses locally

getAnyAddress

public static InetAddress getAnyAddress()

getLoopbackAddress

public static InetAddress getLoopbackAddress()

getFirstNetworkInterface

public static NetworkInterface getFirstNetworkInterface(boolean preferIPv6)
                                                 throws IOException

Return a first network interface except for the lookback But, if any network interfaces were not found locally, the lookback interface is returned.

Parameters:

preferIPv6 - flag to indicate if IPV6 is preferred

Returns:

a first network interface

Throws:

IOException - if an I/O error occurs or a network interface was not found

getLocalHostAddress

public static InetAddress getLocalHostAddress()

getPreferIpv6Addresses

public static boolean getPreferIpv6Addresses()

getFirstInetAddress

public static InetAddress getFirstInetAddress()
                                       throws IOException

Return a first InetAddress of the first network interface check java property java.net.preferIPv6Addresses for whether to favor IPv4 or IPv6. (java default is to favor IPv4 addresses) If unable to find a valid network interface, then fallback to trying to get localhost address as last resort.

Returns:

a first found InetAddress.

Throws:

IOException - if an I/O error occurs or a network interface was not found

getFirstInetAddress

public static InetAddress getFirstInetAddress(boolean preferIPv6)
                                       throws IOException

Return a first InetAddress of the first network interface But, if any network interfaces were not found locally, null could be returned.

Parameters:

preferIPv6 - if true, prefer IPv6 InetAddress. otherwise prefer IPv4 InetAddress

Returns:

a first found InetAddress.

Throws:

IOException - if an I/O error occurs or a network interface was not found

getNetworkInetAddress

public static InetAddress getNetworkInetAddress(NetworkInterface anInterface,
                                                boolean preferIPv6)
                                         throws IOException

Return a first InetAddress of network interface But, if any network interfaces were not found locally, null could be returned.

Parameters:

anInterface - the type of network interface

preferIPv6 - if true, prefer IPv6 InetAddress. otherwise prefer IPv4 InetAddress

Returns:

a first found InetAddress.

Throws:

IOException - if an I/O error occurs or a network interface was not found

isLoopbackNetworkInterface

public static boolean isLoopbackNetworkInterface(NetworkInterface anInterface)

supportsMulticast

public static boolean supportsMulticast(NetworkInterface anInterface)

isUp

public static boolean isUp(NetworkInterface anInterface)

writeIntToByteArray

public static void writeIntToByteArray(byte[] bytes,
                                       int offset,
                                       int value)
                                throws IllegalArgumentException

Throws:

IllegalArgumentException

getIntFromByteArray

public static int getIntFromByteArray(byte[] bytes,
                                      int offset)
                               throws IllegalArgumentException

Throws:

IllegalArgumentException

serialize

public static int serialize(OutputStream baos,
                            Map<String,Serializable> messages)
                     throws MessageIOException

Throws:

MessageIOException

deserialize

public static void deserialize(InputStream is,
                               int count,
                               Map<String,Serializable> messages)
                        throws MessageIOException

Throws:

MessageIOException

isBindAddressValid

public static boolean isBindAddressValid(String addressString)

resolveBindInterfaceName

public static InetAddress resolveBindInterfaceName(String addressString)

main

public static void main(String[] args)
                 throws IOException

Throws:

IOException