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Java Source Code / Java Documentation » Forum » nemesis forum » org.nemesis.forum.impl

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

org.nemesis.forum.impl .DbSequenceManager

DbSequenceManager

public class DbSequenceManager (Code)

Manages sequences of unique ID's that get stored in the database. Database support for sequences varies widely; some don't support them at all. So, we handle unique ID generation with synchronized counters.

Selecting the initial ID for each sequence is trivial: we simply query the database to get the last highest unique ID, and then add 1 to that.

This method only works if a single instance is pointed at a database. Otherwise, the unique ID's will stop being unique. :) A refined class that deals with this is coming soon.

Field Summary
protected static Log	log

Constructor Summary
public	DbSequenceManager() Creates a new DbSequenceManager and initializes all of the counters.

Method Summary
public static int	nextID(String type) Returns the next ID of the specified type. Parameters: type - the type of unique ID.
public int	nextUniqueID(String counterName) Provides the next available unique ID for a particular object type. Essentially this provides for the functionality of an auto-increment database field.

Field Detail

log
protected static Log log(Code)

Constructor Detail

DbSequenceManager
public DbSequenceManager()(Code)
	Creates a new DbSequenceManager and initializes all of the counters.

Method Detail

nextID
public static int nextID(String type)(Code)
	Returns the next ID of the specified type. Parameters: type - the type of unique ID. the next unique ID of the specified type.

nextUniqueID
public int nextUniqueID(String counterName)(Code)
	Provides the next available unique ID for a particular object type. Essentially this provides for the functionality of an auto-increment database field. Valid counter names are Forum, ForumThread, ForumMessage, Group, and User. Those that are integrating into existing tables should be sure that the table names match up so that the correct starting unique id can be determined.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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