mapping.data
Class ServersTable

java.lang.Object
  java.util.Dictionary<K,V>
      java.util.Hashtable<java.lang.Integer,Server>
          mapping.data.ServersTable

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, java.util.Map<java.lang.Integer,Server>

public class ServersTable
extends java.util.Hashtable<java.lang.Integer,Server>
implements java.io.Serializable

This class represents the collection of servers in the system. It was implemented as a Hashtable. This class is thread safe.

Author:

Majd Kokaly

See Also:

Serialized Form

Constructor Summary

ServersTable()

ServersTable(int initialCapacity)

ServersTable(int initialCapacity, float loadFactor)

Method Summary

void	addServer(Server server) This method adds a Server object to the table and gives it its unique ID.
void	addServersListener(ServersTableListener listener) Adds a listener to this object.
void	clearServerActiveJobsNumber(int serverID)
double	getFailurePeriodsMeanOfAllServersInMinutes()
Server	getServer(java.lang.String hostname)
double	getUpTimeMeanOfAllServersInMinutes()
boolean	isServerDown(int serverID)
void	printAll()
void	removeServer(int id) This method removes a server with ID id and reorders the servers.
void	setServerDown(int serverID, boolean down) This method set the server of ID serverID to down.

Methods inherited from class java.util.Hashtable

clear, clone, contains, containsKey, containsValue, elements, entrySet, equals, get, hashCode, isEmpty, keys, keySet, put, putAll, remove, size, toString, values

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ServersTable

public ServersTable()

ServersTable

public ServersTable(int initialCapacity)

ServersTable

public ServersTable(int initialCapacity,
                    float loadFactor)

Method Detail

addServersListener

public void addServersListener(ServersTableListener listener)

Adds a listener to this object.

Parameters:

listener - The listener to be added.

printAll

public void printAll()

addServer

public void addServer(Server server)

This method adds a Server object to the table and gives it its unique ID.

Parameters:

server - the server to be added.

getServer

public Server getServer(java.lang.String hostname)

Parameters:

hostname - The hostname of the machine being sought.

Returns:

The Server object that has the host name hostname. It returns null if server is not found.

removeServer

public void removeServer(int id)

This method removes a server with ID id and reorders the servers. It is always true that if there is N servers in the system that the IDs of the server are in the set {1 , 2, .. N}.

Parameters:

id - The id of the server to be deleted.

isServerDown

public boolean isServerDown(int serverID)

Parameters:

serverID - The ID of the server in subject.

Returns:

true if the server with serverID is down, false otherwise.

setServerDown

public void setServerDown(int serverID,
                          boolean down)

This method set the server of ID serverID to down.

Parameters:

serverID - The ID of the server in subject.

down - A boolean value determining wheather the server is down or not.

clearServerActiveJobsNumber

public void clearServerActiveJobsNumber(int serverID)

Parameters:

serverID - The ID of the server in subject.

getFailurePeriodsMeanOfAllServersInMinutes

public double getFailurePeriodsMeanOfAllServersInMinutes()

Returns:

The failure periods mean of all servers in minutes.

See Also:

Server.clearActiveJobsNumber()

getUpTimeMeanOfAllServersInMinutes

public double getUpTimeMeanOfAllServersInMinutes()

Returns:

The up-time mean of all servers in minutes