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Class tc.message.handler.server.DatabaseMessageHandler 

java.lang.Object
   |
   +----connection.MessageHandler
           |
           +----tc.message.handler.server.DatabaseMessageHandler
public abstract class DatabaseMessageHandler
extends MessageHandler
DatabaseMessageHandler is a super class for all message handlers handling messages that trigger database actions. DatabaseMessageHandler holds a reference to the database manager to whom database queries are delegated.

See Also:
DatabaseManager

Variable Index

o databaseManager
The database manager.

Constructor Index

o DatabaseMessageHandler(ConnectionManager, DatabaseManager, MessageHandler)
Creates a new database message handler.

Method Index

o getDatabaseManager()
Returns the database manager.
o handle(Message)
Overrides the method defined in MessageHandler.
o sendConfirmationMessage(byte)
Convenience method for subclasses: sends a confirmation.
o sendErrorMessage(byte, String)
Convenience method for subclasses: sends an error message.
o sendFailedMessage(Exception)
Convenience method for subclasses: sends a message informing about an exception.
o setDatabaseManager(DatabaseManager)
Sets the database manager.
o subclassHandle(Message)
This method must be overriden in subclasse to handle particular messages.

Variables

o databaseManager 
 DatabaseManager databaseManager
The database manager.

Constructors

o DatabaseMessageHandler 
 public DatabaseMessageHandler(ConnectionManager cm,
                               DatabaseManager d,
                               MessageHandler successor)
Creates a new database message handler.

Methods

o subclassHandle 
 public abstract boolean subclassHandle(Message m) throws Exception
This method must be overriden in subclasse to handle particular messages.

Returns:
boolean true if the message was handled, false otherwise.
o handle 
 public boolean handle(Message m)
Overrides the method defined in MessageHandler.

Overrides:
handle in class MessageHandler
o sendFailedMessage 
 protected void sendFailedMessage(Exception caughtException)
Convenience method for subclasses: sends a message informing about an exception.

o sendConfirmationMessage 
 protected void sendConfirmationMessage(byte messageType)
Convenience method for subclasses: sends a confirmation.

o sendErrorMessage 
 protected void sendErrorMessage(byte messageType,
                                 String situationDescription)
Convenience method for subclasses: sends an error message.

o getDatabaseManager 
 protected DatabaseManager getDatabaseManager()
Returns the database manager.

o setDatabaseManager 
 protected void setDatabaseManager(DatabaseManager dm)
Sets the database manager. 

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