zeta.util
Class Parameter

java.lang.Object
  |
  +--zeta.util.Parameter

public class Parameter

extends java.lang.Object

Gets global parameters from the database.

Field Summary

static int	GLOBAL_PARAMETER
private static java.util.Map	mapValue Cache for parameters.
private static long[]	serverMaxWorkUnitId Values which are returned from the method getServerMaxWorkUnitId.
private static java.lang.Boolean	updateServerMaxWorkUnitId true if the attribute serverMaxWorkUnitId has to retrieve from the database.

Constructor Summary

Parameter()

Method Summary

static long[]	getServerMaxWorkUnitId(ZetaServlet servlet, java.sql.Statement stmt, int serverId, int taskId) Returns the maximal possible work unit ID (result[0]+result[1] = work_unit_id+range) for the specified server.
static long	getValue(java.sql.Statement stmt, java.lang.String parameter, int taskId, long defaultValue, long cachingTime) Returns the value of the specified task parameter.
static java.lang.String	getValue(java.sql.Statement stmt, java.lang.String parameter, int taskId, java.lang.String defaultValue) Returns the value of the specified task parameter.
static java.lang.String	getValue(java.sql.Statement stmt, java.lang.String parameter, int taskId, java.lang.String defaultValue, long cachingTime) Returns the value of the specified task parameter.
static java.lang.String	getValue(java.sql.Statement stmt, java.lang.String parameter, java.lang.String defaultValue) Returns the value of the specified global parameter.
static long	newServerMaxWorkUnitId(ZetaServlet servlet, java.sql.Statement stmt, int serverId, int taskId) Inserts a new reservation of work units in the database for the specified server.
static void	setValue(int serverId, java.sql.Statement stmt, int taskId, java.lang.String parameter, java.lang.String value, boolean synchronizeWithOtherServers) Set the value of the specified global parameter.
static void	setValue(java.sql.Statement stmt, int taskId, java.lang.String parameter, java.lang.String value) Set the value of the specified task parameter.
static void	setValue(java.sql.Statement stmt, java.lang.String parameter, java.lang.String value) Set the value of the specified global parameter.

Methods inherited from class java.lang.Object

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

Field Detail

GLOBAL_PARAMETER

public static final int GLOBAL_PARAMETER

See Also:

Constant Field Values

mapValue

private static java.util.Map mapValue

Cache for parameters.

updateServerMaxWorkUnitId

private static java.lang.Boolean updateServerMaxWorkUnitId

true if the attribute serverMaxWorkUnitId has to retrieve from the database.

serverMaxWorkUnitId

private static long[] serverMaxWorkUnitId

Values which are returned from the method getServerMaxWorkUnitId.

Constructor Detail

Parameter

public Parameter()

Method Detail

getValue

public static java.lang.String getValue(java.sql.Statement stmt,
                                        java.lang.String parameter,
                                        java.lang.String defaultValue)
                                 throws java.sql.SQLException

Returns the value of the specified global parameter.

Parameters:

stmt - statement object's database

parameter - global parameter

defaultValue - default value

Returns:

the value of the specified global parameter.

Throws:

java.sql.SQLException - if a database access error occurs.

getValue

public static java.lang.String getValue(java.sql.Statement stmt,
                                        java.lang.String parameter,
                                        int taskId,
                                        java.lang.String defaultValue)
                                 throws java.sql.SQLException

Returns the value of the specified task parameter.

Parameters:

stmt - statement object's database

parameter - global parameter

taskId - ID of the task

defaultValue - default value

Returns:

the value of the specified global parameter.

Throws:

java.sql.SQLException - if a database access error occurs.

getValue

public static long getValue(java.sql.Statement stmt,
                            java.lang.String parameter,
                            int taskId,
                            long defaultValue,
                            long cachingTime)
                     throws java.sql.SQLException

Returns the value of the specified task parameter.

Parameters:

stmt - statement object's database

parameter - global parameter

taskId - ID of the task

defaultValue - default value

cachingTime - caching the value for milli seconds

Returns:

the value of the specified global parameter.

Throws:

java.sql.SQLException - if a database access error occurs.

getValue

public static java.lang.String getValue(java.sql.Statement stmt,
                                        java.lang.String parameter,
                                        int taskId,
                                        java.lang.String defaultValue,
                                        long cachingTime)
                                 throws java.sql.SQLException

Returns the value of the specified task parameter.

Parameters:

stmt - statement object's database

parameter - task parameter

taskId - ID of the task

defaultValue - default value

cachingTime - caching the value for milli seconds

Returns:

the value of the specified global parameter.

Throws:

java.sql.SQLException - if a database access error occurs.

setValue

public static void setValue(java.sql.Statement stmt,
                            java.lang.String parameter,
                            java.lang.String value)
                     throws java.sql.SQLException

Set the value of the specified global parameter. This parameter will not be synchronized with other servers.

Parameters:

stmt - statement object's database

parameter - global parameter

value - value of the parameter

Throws:

java.sql.SQLException - if a database access error occurs.

setValue

public static void setValue(java.sql.Statement stmt,
                            int taskId,
                            java.lang.String parameter,
                            java.lang.String value)
                     throws java.sql.SQLException

Set the value of the specified task parameter. This parameter will not be synchronized with other servers.

Parameters:

stmt - statement object's database

taskId - ID of the task

parameter - task parameter

value - value of the parameter

Throws:

java.sql.SQLException - if a database access error occurs.

setValue

public static void setValue(int serverId,
                            java.sql.Statement stmt,
                            int taskId,
                            java.lang.String parameter,
                            java.lang.String value,
                            boolean synchronizeWithOtherServers)
                     throws java.sql.SQLException

Set the value of the specified global parameter.

Parameters:

serverId - ID of the server

taskId - ID of the task

stmt - statement object's database

parameter - global parameter

value - value of the parameter

synchronizeWithOtherServers - the parameter will be synchronized with other servers.

Throws:

java.sql.SQLException - if a database access error occurs.

getServerMaxWorkUnitId

public static long[] getServerMaxWorkUnitId(ZetaServlet servlet,
                                            java.sql.Statement stmt,
                                            int serverId,
                                            int taskId)
                                     throws java.sql.SQLException,
                                            javax.servlet.ServletException

Returns the maximal possible work unit ID (result[0]+result[1] = work_unit_id+range) for the specified server.

Parameters:

servlet - servlet which has a connection to the server database.

stmt - statement object's database

serverId - ID of the server

taskId - ID of the task

Returns:

the maximal possible work unit ID (result[0]+result[1] = work_unit_id+range) for the specified server.

Throws:

java.sql.SQLException - if a database access error occurs.

javax.servlet.ServletException

newServerMaxWorkUnitId

public static long newServerMaxWorkUnitId(ZetaServlet servlet,
                                          java.sql.Statement stmt,
                                          int serverId,
                                          int taskId)
                                   throws java.sql.SQLException,
                                          javax.servlet.ServletException

Inserts a new reservation of work units in the database for the specified server.

Parameters:

servlet - servlet which has a connection to the server database.

stmt - statement object's database

serverId - ID of the server

taskId - ID of the task

Throws:

java.sql.SQLException - if a database access error occurs or the table 'zeta.server' is not defined.

javax.servlet.ServletException