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Class syd.remoteclock.RemoteClock 

java.lang.Object
   |
   +----syd.remoteclock.RemoteClock
public class RemoteClock
extends Object
Gets in touch with a remote NTP server and holds that data about the contact. For details about the NTP protocol please see rfc 1305

Constructor Index

o RemoteClock()

Method Index

o precision()
ACCESSOR: returns the DISPERSION (sorry about the name) declared by the server for its own clock
o read(long, LogicalClock, String, int, long)
MUTATOR: carries out the communication with the remote NTP server.
o read_baseline()
ACCESSOR: returns the baseline (computed on the SystemClock) corresponding to the event of receiving the reply from the server.
o t0()
ACCESSOR: returns the time when the request was originated (according to the logical clock or to the system clock).
o t1()
ACCESSOR: returns the time when the reply was received (according to the logical clock or to the system clock).
o tr()
ACCESSOR: returns the time when the request was received by the server (according with server's clock)
o tx()
ACCESSOR: returns the time when the reply was sent by the server (according with server's clock)

Constructors

o RemoteClock 
 public RemoteClock()

Methods

o read 
 public void read(long b,
                  LogicalClock lc,
                  String h,
                  int p,
                  long w) throws IOException, LogicalClockException
MUTATOR: carries out the communication with the remote NTP server.

The operation is timed out using the quantity w passed as parameter, computed from a baseline b passed as parameter. The timing of the operation is computed using a LogicalClock, also provided as a parameter. If the LogicalClock is not valid, the SystemClock is used instead.

Parameters:
b - a long indicating the baseline upon which to count the timeout;
lc - the LogicalClock used to compute the timing of the operation.
h - a String containing the address (IP or symbolic) of the server
p - the port number at the server's end: 123 for NTP
w - a long indicating the lapse indicating the timeout
o read_baseline 
 public long read_baseline()
ACCESSOR: returns the baseline (computed on the SystemClock) corresponding to the event of receiving the reply from the server.

Returns:
the baseline (computed on the SystemClock) corresponding to the event of receiving the reply from the server.
o t0 
 public long t0()
ACCESSOR: returns the time when the request was originated (according to the logical clock or to the system clock).

Returns:
the time when the request was originated (according to the logical clock or to the system clock).
See Also:
read
o tr 
 public long tr()
ACCESSOR: returns the time when the request was received by the server (according with server's clock)

Returns:
the time when the request was received by the server (according with server's clock)
o tx 
 public long tx()
ACCESSOR: returns the time when the reply was sent by the server (according with server's clock)

Returns:
the time when the reply was sent by the server (according with server's clock)
o t1 
 public long t1()
ACCESSOR: returns the time when the reply was received (according to the logical clock or to the system clock).

Returns:
the time when the reply was received (according to the logical clock or to the system clock).
See Also:
read
o precision 
 public long precision()
ACCESSOR: returns the DISPERSION (sorry about the name) declared by the server for its own clock

Returns:
the DISPERSION (sorry about the name) declared by the server for its own clock 
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