How to use com.netflix.eureka2.interests

  @Override
  public Boolean call(ChangeNotification<T> notification) {
    return interest.matches(notification.getData());
  }
}).subscribe(toReturn); // data source sends all notifications irrespective of the interest set. Here we filter based on interest.

public static Interest<InstanceInfo> forApplications(Operator operator, String... applicationNames) {
  if (applicationNames.length == 0) {
    return EmptyRegistryInterest.getInstance();
  }
  if (applicationNames.length == 1) {
    return new ApplicationInterest(applicationNames[0], operator);
  }
  Interest[] interests = new Interest[applicationNames.length];
  for (int i = 0; i < interests.length; i++) {
    interests[i] = new ApplicationInterest(applicationNames[i], operator);
  }
  return new MultipleInterests<InstanceInfo>(interests);
}

public static Interest<InstanceInfo> forInstance(Operator operator, String... instanceIds) {
  if (instanceIds.length == 0) {
    return EmptyRegistryInterest.getInstance();
  }
  if (instanceIds.length == 1) {
    return new InstanceInterest(instanceIds[0], operator);
  }
  Interest[] interests = new Interest[instanceIds.length];
  for (int i = 0; i < interests.length; i++) {
    interests[i] = new InstanceInterest(instanceIds[i], operator);
  }
  return new MultipleInterests<InstanceInfo>(interests);
}

  @Override
  public ChangeNotification<T> call(T data) {
    return new ChangeNotification<>(Kind.Add, data);
  }
};

public ChangeNotification<T> toBaseNotification() {
  return new ChangeNotification<>(getKind(), getData());
}

public ModifyNotification<T> toBaseNotification() {
  return new ModifyNotification<>(getData(), getDelta());
}

public Interest<InstanceInfo> toComposite() {
  if(interests.length == 0) {
    return Interests.forNone();
  }
  if (interests.length > 1) {
    return new MultipleInterests<InstanceInfo>(interests);
  }
  return interests[0];
}

public static Interest<InstanceInfo> forSecureVips(Operator operator, String... secureVips) {
  if (secureVips.length == 0) {
    return EmptyRegistryInterest.getInstance();
  }
  if (secureVips.length == 1) {
    return new SecureVipInterest(secureVips[0], operator);
  }
  Interest[] interests = new Interest[secureVips.length];
  for (int i = 0; i < interests.length; i++) {
    interests[i] = new SecureVipInterest(secureVips[i], operator);
  }
  return new MultipleInterests<InstanceInfo>(interests);
}

public static Interest<InstanceInfo> forVips(Operator operator, String... vips) {
  if (vips.length == 0) {
    return EmptyRegistryInterest.getInstance();
  }
  if (vips.length == 1) {
    return new VipInterest(vips[0], operator);
  }
  Interest[] interests = new Interest[vips.length];
  for (int i = 0; i < interests.length; i++) {
    interests[i] = new VipInterest(vips[i], operator);
  }
  return new MultipleInterests<InstanceInfo>(interests);
}

  @Override
  public Boolean call(InstanceInfo instanceInfo) {
    return instanceInfo != null && interest.matches(instanceInfo);
  }
});

  @Override
  public Boolean call(ChangeNotification<?> notification) {
    return notification.isDataNotification();
  }
};

@Override
public String toString() {
  return "SourcedChangeNotification{" +
      "source=" + source +
      "} " + super.toString();
}

  @Override
  public ChangeNotification<InstanceInfo> call(StreamStateNotification.BufferState state) {
    if (state == StreamStateNotification.BufferState.BufferEnd) {
      return new StreamStateNotification<>(state, interest);
    }
    return null;
  }
})

@Override
public final void onNext(ChangeNotification<T> notification) {
  // Since we pause notifications during iterator creation, we will not get an onNext when iterator creation is in progress.
  addNotification(notification);
}

  @Override
  public ChangeNotification<InstanceInfo> newNotification(InstanceInfo seed) {
    return new ChangeNotification<>(ChangeNotification.Kind.Add, seed);
  }
},

  @Override
  public String toString() {
    return "ModifyNotification{" +
        "delta=" + delta +
        "} " + super.toString();
  }
}

  @Override
  public ChangeNotification<InstanceInfo> newNotification(InstanceInfo seed) {
    return new ChangeNotification<>(ChangeNotification.Kind.Delete, seed);
  }
},

  @Override
  public ChangeNotification<InstanceInfo> newNotification(InstanceInfo seed) {
    return new ChangeNotification<>(ChangeNotification.Kind.Add, seed);
  }
},

  @Override
  public ChangeNotification<InstanceInfo> newNotification(InstanceInfo seed) {
    return new ChangeNotification<>(ChangeNotification.Kind.Delete, seed);
  }
},

  @Override
  public ChangeNotification<InstanceInfo> newNotification(InstanceInfo seed) {
    return new ChangeNotification<>(ChangeNotification.Kind.Add, seed);
  }
},