Beans Use cases

Access Hagrid Internal Services

In each bean, a developer can access Hagrid's internal services via service SyncContainerService. Each step inherits a method called getSyncContainerService() from parent class AbstractBean.

Using method getSyncContainerService(), developer can access the sync container. Once developer has the syncContainerService, any internal service can be accessed like this

SyncContainerService syncContainerService = getSyncContainerService();
SyncService syncService = syncContainerService.getBean(SyncService.class);
AnalyticsFactory analyticsFactory = syncContainerService.getBean(AnalyticsFactory.class);
Namespace namespace = syncServiceContainer.getBean(Namespace.class);
AnalyticsService analyticsService = analyticsFactory.getAnalyticsService(namespace.getNamespace());

Add, Update or Delete Attributes

Suppose, you want to add , update or delete attributes of the bean, then it can be done via transform method that is inherited from parent class AbstractBean

import java.util.Date;

// Add attributes
@Override
public void transform() {

    this.created_at = new Date();
}

// Modify attributes
@Override
public void transform() {

    this.name = this.name.toLower();
}


// Delete unwanted attributes
@Override
public void transform() {

    this.unwantedAttribute = null;
}

Filter Beans

You can also filter beans which does not meet the business requirements. For this Hagrid provides a method filter which is inherited from the class AbstractBean

@Override
public void filter() {

    if(this.email == null){
        return false;
    }
}

Split Bean into multiple Beans

There are the cases wherein you would like to split the bean into multiple smaller beans. For instance, suppose you got a bean like this

{
  "name" : "Amit Aggarwal",
  "company" : "freshworks",
  "address_lines" : [{
    "line 1" : "Bangalore"
  },{
    "line 1" : "Chennai" 
  }]
}

Now, you would like split into

{
  "name" : "Amit Aggarwal",
  "company" : "freshworks",
  "address" : {
    "line 1" : "Bangalore"
  }
}

{
  "name" : "Amit Aggarwal",
  "company" : "freshworks",
  "address" : {
    "line 1" : "Chennai"
  }
}

for this purpose, use map method provided to achieve the same

public List<AbstractBean> map() {

  // here split this bean into list of other beans 

}

Get Parent Bean

There will be the use case where you would like to add / update or delete some properties based on the parent bean. You can access the parentBean of this bean via method getParent. Suppose you are in fbComment bean below.

public void transform(){
    FbPost postBean = (FbPost)this.getParent();

    // This is the post for which this comment is being created
    String postId = postBean.getPostId();
}