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com.jcorporate.expresso.core.dbobj
Class NextNumberImpl  

java.lang.Object
  com.jcorporate.expresso.core.dbobj.NextNumber
      com.jcorporate.expresso.core.dbobj.NextNumberImpl

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public class NextNumberImpl

extends NextNumber

this class is a SOLITAIRE, used in NextNumber

Since:

$DatabaseSchema $Date: 2004/11/17 20:48:11 $

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Field Summary
protected  ConcurrentReaderHashMap	contextMap           Top level hashMap - This level separates the db contexts.
private  java.lang.Object	mInitLock

 

Fields inherited from class com.jcorporate.expresso.core.dbobj.NextNumber

CHECK_PARAMETERS, DEFAULT_CLASS_HANDLER, log, theInstance

 

Constructor Summary

NextNumberImpl()           Create the base level hashes for each db key.

 

Method Summary
protected  void	checkParams(java.lang.String db, DBObject callingObject, java.lang.String fieldName)           All parameters are fully checked to avoid potential NullPointerExceptions
long	getNext(java.lang.String db, DBObject callingDBObject, java.lang.String fieldName)           Get the nextnumber for this dbobject.
private  com.jcorporate.expresso.core.misc.ReusableLong	getNextNumberObject(java.lang.String db, DBObject callingDBObject, java.lang.String fieldName)           Returns the next number object without checking correctness for input parameters May result in NullPointerException if the table is fed bad input.
void	initialize(java.lang.String db, DBObject callingObject)           Initializes hash entries for all auto-inc fields in a particular DBOBject.
void	registerField(java.lang.String db, DBObject callingDBOBject, java.lang.String fieldName)           Register a field for next number information.
void	reset(java.lang.String db)           Reset the counts for the paritcular db each subsequent operation will require a new getMax().
void	reset(java.lang.String db, DBObject callingObject)           Clears the table on a particular dbobject.

 

Methods inherited from class com.jcorporate.expresso.core.dbobj.NextNumber

destroy, getInstance, getKey, getMax

 

Methods inherited from class java.lang.Object

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

 

Field Detail

contextMap

protected volatile ConcurrentReaderHashMap contextMap

Top level hashMap - This level separates the db contexts. The object returned by a get() is another Map() containing lists of dbobject fields. The key is DBObject.getTargetTable() + "." + DBField.getFieldName() this will return the Integer object that will be the number is internally incremented,

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mInitLock

private java.lang.Object mInitLock

Constructor Detail

NextNumberImpl

public NextNumberImpl()

Create the base level hashes for each db key.

Method Detail

initialize

public void initialize(java.lang.String db,
                       DBObject callingObject)
                throws com.jcorporate.expresso.core.db.DBException

Initializes hash entries for all auto-inc fields in a particular DBOBject. This is called the first time that a particular DBObject has a nextnumber called for any field. this method should be synchronized externally.

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registerField

public void registerField(java.lang.String db,
                          DBObject callingDBOBject,
                          java.lang.String fieldName)
                   throws com.jcorporate.expresso.core.db.DBException

Register a field for next number information.

Specified by:

registerField in class NextNumber

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getNextNumberObject

private com.jcorporate.expresso.core.misc.ReusableLong getNextNumberObject(java.lang.String db,
                                                                           DBObject callingDBObject,
                                                                           java.lang.String fieldName)
                                                                    throws com.jcorporate.expresso.core.db.DBException

Returns the next number object without checking correctness for input parameters May result in NullPointerException if the table is fed bad input. if the field is not an auto-inc field, a warning will be logged.

Since:

$DatabaseSchema $Date: 2004/11/17 20:48:11 $

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checkParams

protected void checkParams(java.lang.String db,
                           DBObject callingObject,
                           java.lang.String fieldName)
                    throws com.jcorporate.expresso.core.db.DBException

All parameters are fully checked to avoid potential NullPointerExceptions

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getNext

public long getNext(java.lang.String db,
                    DBObject callingDBObject,
                    java.lang.String fieldName)
             throws com.jcorporate.expresso.core.db.DBException

Get the nextnumber for this dbobject. Increments the internal value.

Specified by:

getNext in class NextNumber

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reset

public void reset(java.lang.String db)

Reset the counts for the paritcular db each subsequent operation will require a new getMax(). There is questionable threadsafety about the reset methods. Please only do it on a "non-live" server. Used after a DBCreate or DeleteSchema has been called.

Specified by:

reset in class NextNumber

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reset

public void reset(java.lang.String db,
                  DBObject callingObject)

Clears the table on a particular dbobject. Similar to reset db

Specified by:

reset in class NextNumber

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> com >> jcorporate >> expresso >> core >> [ dbobj overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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