Implementation Issues

• Flyweight Factory
  • To ensure that Flyweight objects are shared properly, clients must obtain flyweights solely from the flyweight factory (getFlyweight(key)).
  • A flyweight factory maintains a pool of shared flyweights.
    If the requested flyweight already exists in the pool, it is shared (reused) and returned to the client.
    Otherwise, it is created, added to the pool, and returned.
  • The key parameter in the getFlyweight(key) operation is needed to look up the right flyweight in the pool (see Sample Code / Example 1).