helenus/README.md

casser

Cutting edge Java 8 Cassandra Client

Current status: Active development

Features

• Leverages Java 8 language capabilities to build CQL queries
• Simple function-style stream API
• Reactive asynchronous and synchronous API
• Provides Java mapping for Tables and User Defined Types

Requirements

• Only JVM 8
• Latest Datastax Driver 2.1.5
• Latest Cassandra
• Maven

Example

Entity definition:

@Table("timelines")
public interface Timeline {

	@PartitionKey
	UUID userId();
	
	@ClusteringColumn
	@DataTypeName(Name.TIMEUUID)
	Date timestamp();
	
	@Column
	String text();
	
}

Session initialization:

Timeline timeline = Casser.dsl(Timeline.class);
CasserSession session = Casser.init(getSession()).showCql().add(Timeline.class).autoCreateDrop().get();

Select information:

session.select(timeline::userId, timeline::timestamp, timeline::text)
  .where(timeline::userId, Operator.EQ, userId)
  .orderBy(timeline::timestamp, "desc").limit(5).sync()
  .forEach(System.out::println);

Insert information:

TimelineImpl post = new TimelineImpl();
post.userId=userId;
post.timestamp=new Date(postTime+1000L*i);
post.text="hello";
session.upsert(post).sync();