Inversion of object creation through service locator

The service locator pattern works more or less the same as to the factory pattern. The service locator can find the existing object and send it to the client rather than create a new one every time, as with the factory pattern. Instead of getting into detail, we will just look briefly at how the service locator works to create objects. The flow of the service locator can be described as per the following diagram:

• Client is relying on Service Locator to find services. Here, service means any kind of dependency
• Service Locator takes the name of the service, and returns the object of service back to the client

If our balance sheet module uses the service locator, the code of the configureFetchData() method would be like the following snippet:

//Set the fetch data object from ServiceLocator.
  public void configureFetchData(String type){
    this.fetchDataObj = FetchDataServiceLocator.Instance.getFetchData(type);
  }

Similar to fetch data, you need to design a separate service locator for export data. For any new fetch data or export data type, the changes need to be done in the service locator.

Another way of inverting the object creation is DI.