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Oracle Fusion Middleware
Oracle WebLogic Server API Reference
11g Release 1 (10.3.5)

Part Number E13941-05
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weblogic.cluster.singleton
Class QueryHelperImpl

java.lang.Object
  extended by weblogic.cluster.singleton.QueryHelper
      extended by weblogic.cluster.singleton.QueryHelperImpl

public class QueryHelperImpl
extends QueryHelper

Helper class for ClusterMaster to determine servers that are unresponsive and to find lease owners. Queries for lease management. Each lease has an associated timeout which is calculated as (SYSDATE - TIMEOUT). TIMEOUT is initially caclulated as an absolute time in the future (ie. SYSDATE + interval), without renewal TIMEOUT will eventually be in the past and SYSDATE - TIMEOUT will become positive.

Field Summary
 
Fields inherited from class weblogic.cluster.singleton.QueryHelper
TIME_AS_FRACTION_OF_DAY
 
Constructor Summary
QueryHelperImpl(String tableName, String domainName, String clusterName, int dbtype)
           
 
Method Summary
protected  String addToDate(String column, int seconds)
          Returns an sql snippet that adds the specifed number of seconds to the date value.
protected  String compareDates(String date1, String date2)
          Returns an sql snippet that compares the two specified dates.
protected  String getTimeFunction()
          Returns a query that returns the current time & date, down to at least seconds precision.
 
Methods inherited from class weblogic.cluster.singleton.QueryHelper
getAbdicateLeaseQuery, getAcquireLeaseQuery, getAssumeLeaseQuery, getDBType, getDeleteMachineQuery, getInsertMachineQuery, getLeaseOwnerQuery, getPreviousLeaseOwnerQuery, getRenewAllLeasesQuery, getRenewLeaseQuery, getRenewLeasesQuery, getRetrieveMachineQuery, getUnresponsiveMigratableServersQuery, init
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

QueryHelperImpl

public QueryHelperImpl(String tableName,
                       String domainName,
                       String clusterName,
                       int dbtype)
Method Detail

addToDate

protected String addToDate(String column,
                           int seconds)
Description copied from class: QueryHelper
Returns an sql snippet that adds the specifed number of seconds to the date value.

Specified by:
addToDate in class QueryHelper
Parameters:
column - date variable to add to
seconds - number of seconds to add to column
Returns:
an sql snippet

compareDates

protected String compareDates(String date1,
                              String date2)
Description copied from class: QueryHelper
Returns an sql snippet that compares the two specified dates. The query should return true if date1 is later than date2.

Specified by:
compareDates in class QueryHelper
Returns:
an sql snippet

getTimeFunction

protected String getTimeFunction()
Description copied from class: QueryHelper
Returns a query that returns the current time & date, down to at least seconds precision.

Specified by:
getTimeFunction in class QueryHelper
Returns:
an sql snippet
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Oracle Fusion Middleware
Oracle WebLogic Server API Reference
11g Release 1 (10.3.5)

Part Number E13941-05
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SUMMARY: NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD