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org.eclipse.wst.server.core.util
Class SocketUtil
java.lang.Object
org.eclipse.wst.server.core.util.SocketUtil
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public class SocketUtil
- extends java.lang.Object
A utility class for socket-related function. It's main purposes are to find
unused ports, check whether a port is in use, and check whether a given
address is a local(host) address.
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Since:
- 1.0
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Method Summary
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static int
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findUnusedPort
(int low,
int high)
Finds an unused port between the given from and to values. |
static boolean
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isLocalhost
(java.lang.String host)
Checks if the given host (name, fully qualified name, or IP address) is
referring to the local machine. |
static boolean
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isPortInUse
(int port)
Checks to see if the given port number is being used. |
static boolean
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isPortInUse
(int port,
int count)
Checks to see if the given port number is being used. |
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Methods inherited from class java.lang.Object
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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findUnusedPort
public static int findUnusedPort(int low,
int high)
- Finds an unused port between the given from and to values.
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Parameters:
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low - lowest possible port number -
high - highest possible port number
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Returns:
- an unused port number, or
-1 if no used ports could be found
isPortInUse
public static boolean isPortInUse(int port,
int count)
- Checks to see if the given port number is being used.
Returns
true if the given port is in use, and false
otherwise. Retries every 500ms for "count" tries.
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Parameters:
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port - the port number to check -
count - the number of times to retry
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Returns:
- boolean
true if the port is in use, and
false otherwise
isPortInUse
public static boolean isPortInUse(int port)
- Checks to see if the given port number is being used.
Returns
true if the given port is in use, and false
otherwise.
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Parameters:
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port - the port number to check
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Returns:
- boolean
true if the port is in use, and
false otherwise
isLocalhost
public static boolean isLocalhost(java.lang.String host)
- Checks if the given host (name, fully qualified name, or IP address) is
referring to the local machine.
The first time this method is called (or the first call after each time
the network configuration has changed, e.g. by the user switching from a
wired connection to wireless) a background process is used to cache the
network information. On most machines the network information will be found
quickly and the results of this call will be returned immediately.
On machines where the network configuration of the machine is bad or the
network has problems, this first method call will take at most 250ms, but
the results may be incorrect (incomplete).
All subsequent calls (until the network configuration changes) will
return very quickly. If the background process is still running it will
continue to fill the cache and each subsequent call to this method may be
more correct.
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Parameters:
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host - a hostname or IP address
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Returns:
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true if the given host is localhost, and
false otherwise
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