helenus/README.md

casser

Cutting edge Java 8 Cassandra Client

Current status: Almost all features are implemented, stabilizing, testing

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, Tuples, User Defined Types, Collections, UDT Collections, Tuple Collections

Requirements

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

Maven

Active development dependency:

<dependencies>
	<dependency>
		<groupId>com.noorq.casser</groupId>
		<artifactId>casser-core</artifactId>
		<version>1.0.0-SNAPSHOT</version>
	</dependency>
</dependencies>

<repositories>
    <repository>
        <id>oss-sonatype</id>
        <name>oss-sonatype</name>
        <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
</repositories>

Example

Entity definition:

@Table("timelines")
public interface Timeline {

	@PartitionKey
	UUID userId();
	
	@ClusteringColumn
	@Types.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, Query.eq(userId))
  .orderBy(Query.desc(timeline::timestamp)).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();