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Spring Data: Bridging Multiple Databases

Solution: Implementing Library Analytics

Explore how to implement library analytics by creating the BookAnalytics class with annotations for Cassandra integration. Learn to define repository interfaces and update analytics data like borrowed and viewed counts. Understand data bootstrapping and methods to increment and check analytics records within a Spring Data Cassandra application.

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Let’s discuss the solution for implementing library analytics.

Create the BookAnalytics class

First, we create the BookAnalytics class in the com.smartdiscover.model package.

Java
package com.smartdiscover.model;
import lombok.Data;
import org.springframework.data.cassandra.core.mapping.Column;
import org.springframework.data.cassandra.core.mapping.PrimaryKey;
import org.springframework.data.cassandra.core.mapping.Table;
import java.util.UUID;
@Data
@Table
public class BookAnalytics {
    @PrimaryKey
    private UUID bookId;
    @Column
    private String bookName;
    @Column
    private long borrowedCount;
    @Column
    private long viewedCount;
    @Column
    private double averageRating;
    @Column
    private long totalRatings;
    @Override
    public String toString() {
        return "BookAnalytics{" +
                "bookId=" + bookId +
                ", bookName='" + bookName + '\'' +
                ", borrowedCount='" + borrowedCount + '\'' +
                ", viewedCount='" + viewedCount + '\'' +
                ", averageRating='" + averageRating + '\'' +
                ", totalRatings='" + totalRatings + '\'' +
                '}';
    }
    public BookAnalytics(UUID bookId, String bookName) {
        this.bookId = bookId;
        this.bookName = bookName;
        this.borrowedCount = 0;
        this.viewedCount = 0L;
        this.averageRating = 0D;
    }
    public void incrementBorrowedCount() {
        this.borrowedCount += 1;
    }
    public void incrementViewedCount() {
        this.viewedCount += 1;
    }
    public void incrementTotalRatings() {
        this.totalRatings += 1;
    }
    
}

Code explanation:

  • Lines 10–12: We add annotations like @Data and @Table to refer to a Cassandra table from the POJO.

  • Line 14: We add the bookId property as the primary key using the @PrimaryKey annotation.

  • Lines 17–30: We add properties like bookName, borrowedCount, viewedCount, averageRating, and totalRatings and annotate them with the @Column annotation.

  • Lines 32–41: We ...