 The IdentityProvider creates identities for each schedulable
 * by extracting fields and returning an identity string.
 *
 * Implementers will be able to change how schedulers treat
 * Schedulables.
 The IdentityProvider creates identities for each schedulable
 * by extracting fields and returning an identity string.
 *
 * Implementers will be able to change how schedulers treat
 * Schedulables. | IdentityProvider.java