Class DBContext

All Implemented Interfaces:
Context, InternalEventContext, InternalHousekeepingContext

public class DBContext extends AbstractContext
Example context impl that uses a database to store stuff :) yes, this is silly expects a mysql db test with table CREATE TABLE contextstore ( k varchar(100), val blob ); very fragile, crappy code.... just a demo!
Version:
$Id$
  • Field Details

  • Constructor Details

    • DBContext

      public DBContext()
    • DBContext

      public DBContext(Context inner)
  • Method Details

    • internalGet

      public Object internalGet(String key)
      retrieves a serialized object from the db and returns the living instance to the caller.
      Specified by:
      internalGet in class AbstractContext
      Parameters:
      key - key whose associated value is to be returned
      Returns:
      object stored in the context
    • internalPut

      public Object internalPut(String key, Object value)
      Serializes and stores an object in the database. This is really a hokey way to do it, and will cause problems. The right way is to use a prepared statement...
      Specified by:
      internalPut in class AbstractContext
      Parameters:
      key - key with which to associate the value
      value - value to be associated with the key
      Returns:
      previously stored value if exists, or null
    • internalContainsKey

      public boolean internalContainsKey(String key)
      Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."
      Specified by:
      internalContainsKey in class AbstractContext
      Parameters:
      key - key to test for existence
      Returns:
      true if found, false if not
    • internalGetKeys

      public String[] internalGetKeys()
      Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."
      Specified by:
      internalGetKeys in class AbstractContext
      Returns:
      array of keys
    • internalRemove

      public Object internalRemove(String key)
      Not implementing. Not required for Velocity core operation, so not bothering. As we say above : "very fragile, crappy code..."
      Specified by:
      internalRemove in class AbstractContext
      Parameters:
      key - key to remove
      Returns:
      object removed if exists, else null
    • setup

      private void setup()