org.globus.net
Class PortRange

java.lang.Object
  org.globus.net.PortRange

public class PortRange

extends Object

This class manages the port ranges. It keeps track of which ports are used and which ones are open.

Field Summary

protected static byte	UNUSED
protected static byte	USED

Constructor Summary

protected

PortRange()

Method Summary

void	free(int portNumber) Releases or frees the port number.
int	getFreePort(int lastPortNumber) Returns first available port.
static PortRange	getInstance() Returns PortRange instance for TCP listening sockets.
static PortRange	getTcpInstance() Returns PortRange instance for TCP listening sockets.
static PortRange	getTcpSourceInstance() Returns PortRange instance for TCP source sockets.
static PortRange	getUdpSourceInstance() Returns PortRange instance for UDP source sockets.
boolean	isEnabled() Checks if the port range is set.
void	setUsed(int portNumber) Sets the port number as used.

Methods inherited from class java.lang.Object

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

Field Detail

UNUSED

protected static final byte UNUSED

See Also:

Constant Field Values

USED

protected static final byte USED

See Also:

Constant Field Values

Constructor Detail

PortRange

protected PortRange()

Method Detail

getInstance

public static PortRange getInstance()

Returns PortRange instance for TCP listening sockets.

See Also:

getTcpInstance()

getTcpInstance

public static PortRange getTcpInstance()

Returns PortRange instance for TCP listening sockets. If the tcp.port.range property is set, the class will be initialized with the specified port ranges.

Returns:

PortRange the default instace of this class.

getTcpSourceInstance

public static PortRange getTcpSourceInstance()

Returns PortRange instance for TCP source sockets. If the tcp.source.port.range property is set, the class will be initialized with the specified port ranges.

Returns:

PortRange the default instace of this class.

getUdpSourceInstance

public static PortRange getUdpSourceInstance()

Returns PortRange instance for UDP source sockets. If the udp.source.port.range property is set, the class will be initialized with the specified port ranges.

Returns:

PortRange the default instace of this class.

isEnabled

public boolean isEnabled()

Checks if the port range is set.

Returns:

true if the port range is set, false otherwise.

getFreePort

public int getFreePort(int lastPortNumber)
                throws IOException

Returns first available port.

Parameters:

lastPortNumber - port number to start finding the next available port from. Set it to 0 if called initialy.

Returns:

the next available port number from the lastPortNumber.

Throws:

IOException - if there is no more free ports available or if the lastPortNumber is incorrect.

setUsed

public void setUsed(int portNumber)

Sets the port number as used.

Parameters:

portNumber - port number

free

public void free(int portNumber)

Releases or frees the port number. (Mark it as unused)

Parameters:

portNumber - port number