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BAEL-3043: Datastax Java Driver for Apache Cassandra (#7290)

This commit is contained in:
Joel Juarez 2019-08-04 02:26:11 +02:00 committed by KevinGilmore
parent 02c8af2044
commit c06471c727
6 changed files with 262 additions and 1 deletions
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17
persistence-modules/java-cassandra/pom.xml
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@ -4,7 +4,7 @@
<groupId>com.baeldung</groupId>
<artifactId>java-cassandra</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>java-cassandra</name>
<name>java-cassandra</name>
<parent>
<groupId>com.baeldung</groupId>
@ -29,6 +29,19 @@
<version>${cassandra-unit.version}</version>
</dependency>
<!-- DataStax Cassandra -->
<dependency>
<groupId>com.datastax.oss</groupId>
<artifactId>java-driver-core</artifactId>
<version>${datastax-cassandra.version}</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-handler</artifactId>
<version>${io-netty.version}</version>
</dependency>
</dependencies>
<build>
@ -39,6 +52,8 @@
<!-- Cassandra -->
<cassandra-driver-core.version>3.1.2</cassandra-driver-core.version>
<cassandra-unit.version>3.1.1.0</cassandra-unit.version>
<datastax-cassandra.version>4.1.0</datastax-cassandra.version>
<io-netty.version>4.1.34.Final</io-netty.version>
<guava.version>18.0</guava.version>
</properties>

46
persistence-modules/java-cassandra/src/main/java/com/baeldung/datastax/cassandra/Application.java Normal file
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@ -0,0 +1,46 @@
package com.baeldung.datastax.cassandra;
import com.baeldung.datastax.cassandra.domain.Video;
import com.baeldung.datastax.cassandra.repository.KeyspaceRepository;
import com.baeldung.datastax.cassandra.repository.VideoRepository;
import com.datastax.oss.driver.api.core.CqlSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.List;
public class Application {
private static final Logger LOG = LoggerFactory.getLogger(Application.class);
public static void main(String[] args) {
new Application().run();
}
public void run() {
CassandraConnector connector = new CassandraConnector();
connector.connect("127.0.0.1", 9042, "datacenter1");
CqlSession session = connector.getSession();
KeyspaceRepository keyspaceRepository = new KeyspaceRepository(session);
keyspaceRepository.createKeyspace("testKeyspace", "SimpleStrategy", 1);
keyspaceRepository.useKeyspace("testKeyspace");
VideoRepository videoRepository = new VideoRepository(session);
videoRepository.createTable();
videoRepository.insertVideo(new Video("Video Title 1", Instant.now()));
videoRepository.insertVideo(new Video("Video Title 2",
Instant.now().minus(1, ChronoUnit.DAYS)));
List<Video> videos = videoRepository.selectAll();
videos.forEach(x -> LOG.info(x.toString()));
connector.close();
}
}

28
persistence-modules/java-cassandra/src/main/java/com/baeldung/datastax/cassandra/CassandraConnector.java Normal file
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@ -0,0 +1,28 @@
package com.baeldung.datastax.cassandra;
import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.CqlSessionBuilder;
import java.net.InetSocketAddress;
public class CassandraConnector {
private CqlSession session;
public void connect(final String node, final Integer port, final String dataCenter) {
CqlSessionBuilder builder = CqlSession.builder();
builder.addContactPoint(new InetSocketAddress(node, port));
builder.withLocalDatacenter(dataCenter);
session = builder.build();
}
public CqlSession getSession() {
return this.session;
}
public void close() {
session.close();
}
}

51
persistence-modules/java-cassandra/src/main/java/com/baeldung/datastax/cassandra/domain/Video.java Normal file
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@ -0,0 +1,51 @@
package com.baeldung.datastax.cassandra.domain;
import java.time.Instant;
import java.util.UUID;
public class Video {
private UUID id;
private String title;
private Instant creationDate;
public Video(UUID id, String title, Instant creationDate) {
this.id = id;
this.title = title;
this.creationDate = creationDate;
}
public Video(String title, Instant creationDate) {
this.title = title;
this.creationDate = creationDate;
}
public UUID getId() {
return id;
}
public void setId(UUID id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Instant getCreationDate() {
return creationDate;
}
public void setCreationDate(Instant creationDate) {
this.creationDate = creationDate;
}
@Override
public String toString() {
return "[id:" + id.toString() + ", title:" + title + ", creationDate: " + creationDate.toString() + "]";
}
}

27
persistence-modules/java-cassandra/src/main/java/com/baeldung/datastax/cassandra/repository/KeyspaceRepository.java Normal file
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@ -0,0 +1,27 @@
package com.baeldung.datastax.cassandra.repository;
import com.datastax.oss.driver.api.core.CqlSession;
public class KeyspaceRepository {
private final CqlSession session;
public KeyspaceRepository(CqlSession session) {
this.session = session;
}
public void createKeyspace(String keyspaceName, String replicationStrategy, int numberOfReplicas) {
StringBuilder sb = new StringBuilder("CREATE KEYSPACE IF NOT EXISTS ").append(keyspaceName)
.append(" WITH replication = {")
.append("'class':'").append(replicationStrategy)
.append("','replication_factor':").append(numberOfReplicas)
.append("};");
final String query = sb.toString();
session.execute(query);
}
public void useKeyspace(String keyspace) {
session.execute("USE " + keyspace);
}
}

94
persistence-modules/java-cassandra/src/main/java/com/baeldung/datastax/cassandra/repository/VideoRepository.java Normal file
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@ -0,0 +1,94 @@
package com.baeldung.datastax.cassandra.repository;
import com.baeldung.datastax.cassandra.domain.Video;
import com.datastax.oss.driver.api.core.CqlIdentifier;
import com.datastax.oss.driver.api.core.CqlSession;
import com.datastax.oss.driver.api.core.cql.BoundStatement;
import com.datastax.oss.driver.api.core.cql.PreparedStatement;
import com.datastax.oss.driver.api.core.cql.ResultSet;
import com.datastax.oss.driver.api.core.cql.SimpleStatement;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
public class VideoRepository {
private static final String TABLE_NAME = "videos";
private final CqlSession session;
public VideoRepository(CqlSession session) {
this.session = session;
}
public void createTable() {
createTable(null);
}
public void createTable(String keyspace) {
StringBuilder sb = new StringBuilder("CREATE TABLE IF NOT EXISTS ").append(TABLE_NAME).append(" (")
.append("video_id UUID,")
.append("title TEXT,")
.append("creation_date TIMESTAMP,")
.append("PRIMARY KEY(video_id));");
String query = sb.toString();
executeStatement(SimpleStatement.newInstance(query), keyspace);
}
public UUID insertVideo(Video video) {
return insertVideo(video, null);
}
public UUID insertVideo(Video video, String keyspace) {
UUID videoId = UUID.randomUUID();
video.setId(videoId);
String absoluteTableName = keyspace != null ? keyspace + "." + TABLE_NAME: TABLE_NAME;
StringBuilder sb = new StringBuilder("INSERT INTO ").append(absoluteTableName)
.append("(video_id, title, creation_date) values (:video_id, :title, :creation_date)");
PreparedStatement preparedStatement = session.prepare(sb.toString());
BoundStatement statement = preparedStatement.bind()
.setUuid("video_id", video.getId())
.setString("title", video.getTitle())
.setInstant("creation_date", video.getCreationDate());
session.execute(statement);
return videoId;
}
public List<Video> selectAll() {
return selectAll(null);
}
public List<Video> selectAll(String keyspace) {
StringBuilder sb = new StringBuilder("SELECT * FROM ").append(TABLE_NAME);
String query = sb.toString();
ResultSet resultSet = executeStatement(SimpleStatement.newInstance(query), keyspace);
List<Video> result = new ArrayList<>();
resultSet.forEach(x -> result.add(
new Video(x.getUuid("video_id"), x.getString("title"), x.getInstant("creation_date"))
));
return result;
}
private ResultSet executeStatement(SimpleStatement statement, String keyspace) {
if (keyspace != null) {
statement.setKeyspace(CqlIdentifier.fromCql(keyspace));
}
return session.execute(statement);
}
}