UseCase_RideSharing_JavaSDK_getItemRecTopN.java

import io.prediction.ItemRecGetTopNRequestBuilder;

// You need to specify the name of the engine from which you want to retrieve the prediction results. 
// Add the following code to display recommended drivers to the logged-in user:

String[] driverIds;

try {
  // Retrieve top 5 recommended drivers from the item recommendation engine.
  // Assuming client.identify("user id") is already called when the user logged in.
  ItemRecGetTopNRequestBuilder builder = client.getItemRecGetTopNRequestBuilder("the engine name", 5)
    .latitude(latitude) // current latitude of the user. eg. latitude = 37.7881
    .longitude(longitude); // current longitude of the user. eg. longitude = 122.4075
  driverIds = client.getItemRecTopN(builder);
} catch (Exception e) { // exception is raised when there is no prediction result.
  driverIds = getDefaultDrivers(5); // default behavior when there is no recommendation. eg. get nearest 5 drivers
  handleException(e);
}

displayDrivers(driverIds); // display drivers to the user