{"id":25902,"date":"2014-05-30T22:00:51","date_gmt":"2014-05-30T19:00:51","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=25902"},"modified":"2014-05-30T13:23:24","modified_gmt":"2014-05-30T10:23:24","slug":"connecting-to-cassandra-from-java","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2014\/05\/connecting-to-cassandra-from-java.html","title":{"rendered":"Connecting to Cassandra from Java"},"content":{"rendered":"

In my post Hello Cassandra<\/a>, I looked at downloading the Cassandra NoSQL database and using cqlsh to connect to a Cassandra database. In this post, I look at the basics of connecting to a Cassandra database from a Java client.<\/p>\n

Although there are several frameworks available<\/a> for accessing the Cassandra database from Java<\/a>, I will use the DataStax Java Client JAR<\/a> in this post. The DataStax Java Driver for Apache Cassandra<\/a> is available on GitHub<\/a>. The datastax\/java-driver GitHub project page<\/a> states that it is a “Java client driver for Apache Cassandra” that “works exclusively with the Cassandra Query Language version 3 (CQL3<\/a>)” and is “licensed under the Apache License, Version 2.0<\/a>.”<\/p>\n

 
\nThe Java Driver 2.0 for Apache Cassandra page<\/a> provides a high-level overview and architectural details<\/a> about the driver. Its Writing Your First Client section<\/a> provides code listings and explanations regarding connecting to Cassandra<\/a> with the Java driver and executing CQL statements<\/a> from Java code. The code listings in this post are adaptations of those examples applied to my example cases.<\/p>\n

The Cassandra Java Driver<\/a> has several dependencies<\/a>. The Java Driver 2.0 for Apache Cassandra<\/a> documentation<\/a> includes a page called Setting up your Java development environment<\/a> that outlines the Java Driver 2.0’s dependencies<\/a>: cassandra-driver-core-2.0.1.jar<\/a> (datastax\/java-driver 2.0<\/a>), netty-3.9.0-Final.jar<\/a> (netty<\/a> direct<\/a>), guava-16.0.1.jar<\/a> (Guava 16<\/a> direct<\/a>), metrics-core-3.0.2.jar<\/a> (Metrics Core<\/a>), and slf4j-api-1.7.5.jar<\/a> (slf4j<\/a> direct<\/a>). I also found that I needed to place LZ4Factory.java<\/a> and snappy-java<\/a> on the classpath.<\/p>\n

The next code listing is of a simple class called CassandraConnector<\/code>.<\/p>\n

CassandraConnector.java<\/h2>\n
package com.marxmart.persistence;\r\n\r\nimport com.datastax.driver.core.Cluster;\r\nimport com.datastax.driver.core.Host;\r\nimport com.datastax.driver.core.Metadata;\r\nimport com.datastax.driver.core.Session;\r\n\r\nimport static java.lang.System.out;\r\n\r\n\/**\r\n * Class used for connecting to Cassandra database.\r\n *\/\r\npublic class CassandraConnector\r\n{\r\n   \/** Cassandra Cluster. *\/\r\n   private Cluster cluster;\r\n\r\n   \/** Cassandra Session. *\/\r\n   private Session session;\r\n\r\n   \/**\r\n    * Connect to Cassandra Cluster specified by provided node IP\r\n    * address and port number.\r\n    *\r\n    * @param node Cluster node IP address.\r\n    * @param port Port of cluster host.\r\n    *\/\r\n   public void connect(final String node, final int port)\r\n   {\r\n      this.cluster = Cluster.builder().addContactPoint(node).withPort(port).build();\r\n      final Metadata metadata = cluster.getMetadata();\r\n      out.printf(\"Connected to cluster: %s\\n\", metadata.getClusterName());\r\n      for (final Host host : metadata.getAllHosts())\r\n      {\r\n         out.printf(\"Datacenter: %s; Host: %s; Rack: %s\\n\",\r\n            host.getDatacenter(), host.getAddress(), host.getRack());\r\n      }\r\n      session = cluster.connect();\r\n   }\r\n\r\n   \/**\r\n    * Provide my Session.\r\n    *\r\n    * @return My session.\r\n    *\/\r\n   public Session getSession()\r\n   {\r\n      return this.session;\r\n   }\r\n\r\n   \/** Close cluster. *\/\r\n   public void close()\r\n   {\r\n      cluster.close();\r\n   }\r\n}<\/pre>\n
The above connecting class could be invoked as shown in the next code listing.
 
<\/div> <\/div><\/p>\n
Code Using CassandraConnector<\/h2>\n
\/**\r\n * Main function for demonstrating connecting to Cassandra with host and port.\r\n *\r\n * @param args Command-line arguments; first argument, if provided, is the\r\n *    host and second argument, if provided, is the port.\r\n *\/\r\npublic static void main(final String[] args)\r\n{\r\n   final CassandraConnector client = new CassandraConnector();\r\n   final String ipAddress = args.length > 0 ? args[0] : \"localhost\";\r\n   final int port = args.length > 1 ? Integer.parseInt(args[1]) : 9042;\r\n   out.println(\"Connecting to IP Address \" + ipAddress + \":\" + port + \"...\");\r\n   client.connect(ipAddress, port);\r\n   client.close();\r\n}<\/pre>\n
The example code in that last code listing specified default node and port of localhost<\/code> and port 9042<\/code>. This port number is specified in the cassandra.yaml file<\/a> located in the apache-cassandra\/conf<\/a> directory. The Cassandra 1.2 documentation<\/a> has a page on The cassandra.yaml configuration file<\/a> which describes the cassandra.yaml file as “the main configuration file for Cassandra.” Incidentally, another important configuration file in that same directory is cassandra-env.sh<\/a>, which defines numerous JVM options for the Java-based<\/a> Cassandra database.<\/p>\n
For the examples in this post, I will be using a MOVIES table created with the following Cassandra Query Language (CQL):<\/p>\n
createMovie.cql<\/h2>\n
CREATE TABLE movies\r\n(\r\n   title varchar,\r\n   year int,\r\n   description varchar,\r\n   mmpa_rating varchar,\r\n   dustin_rating varchar,\r\n   PRIMARY KEY (title, year)\r\n);<\/pre>\n
The above file can be executed within cqlsh<\/a> with the command source 'C:\\cassandra\\cql\\examples\\createMovie.cql'<\/code> (assuming that the file is placed in the specified directory, of course) and this is demonstrated in the next screen snapshot.<\/p>\n
\"cassandraEnhancedMoviesTableCreated\"<\/a><\/p>\n
One thing worth highlighting here is that the columns that were created as varchar<\/code> datatypes<\/a> are described as text<\/code> datatypes by the cqlsh describe command<\/a>. Although I created this table directly via cqlsh<\/code>, I also could have created the table in Java as shown in the next code listing and associated screen snapshot that follows the code listing.<\/p>\n
Creating Cassandra Table with Java Driver<\/h2>\n
final String createMovieCql =\r\n     \"CREATE TABLE movies_keyspace.movies (title varchar, year int, description varchar, \"\r\n   + \"mmpa_rating varchar, dustin_rating varchar, PRIMARY KEY (title, year))\";\r\nclient.getSession().execute(createMovieCql);<\/pre>\n
The above code accesses an instance variable client<\/code>. The class with this instance variable that it might exist in is shown next.<\/p>\n
Shell of MoviePersistence.java<\/h2>\n
package dustin.examples.cassandra;\r\n\r\nimport com.datastax.driver.core.ResultSet;\r\nimport com.datastax.driver.core.Row;\r\n\r\nimport java.util.Optional;\r\n\r\nimport static java.lang.System.out;\r\n\r\n\/**\r\n * Handles movie persistence access.\r\n *\/\r\npublic class MoviePersistence\r\n{\r\n   private final CassandraConnector client = new CassandraConnector();\r\n\r\n   public MoviePersistence(final String newHost, final int newPort)\r\n   {\r\n      out.println(\"Connecting to IP Address \" + newHost + \":\" + newPort + \"...\");\r\n      client.connect(newHost, newPort);\r\n   }\r\n\r\n   \/**\r\n    * Close my underlying Cassandra connection.\r\n    *\/\r\n   private void close()\r\n   {\r\n      client.close();\r\n   }\r\n}<\/pre>\n
With the MOVIES<\/code> table created as shown above (either by cqlsh<\/code> or with Java client code), the next steps are to manipulate data related to this table. The next code listing shows a method that could be used to write new rows to the MOVIES<\/code> table.<\/p>\n
\/**\r\n * Persist provided movie information.\r\n *\r\n * @param title Title of movie to be persisted.\r\n * @param year Year of movie to be persisted.\r\n * @param description Description of movie to be persisted.\r\n * @param mmpaRating MMPA rating.\r\n * @param dustinRating Dustin's rating.\r\n *\/\r\npublic void persistMovie(\r\n   final String title, final int year, final String description,\r\n   final String mmpaRating, final String dustinRating)\r\n{\r\n   client.getSession().execute(\r\n      \"INSERT INTO movies_keyspace.movies (title, year, description, mmpa_rating, dustin_rating) VALUES (?, ?, ?, ?, ?)\",\r\n      title, year, description, mmpaRating, dustinRating);\r\n}<\/pre>\n
With the data inserted into the MOVIES<\/code> table, we need to be able to query it. The next code listing shows one potential implementation for querying a movie by title and year.<\/p>\n
Querying with Cassandra Java Driver<\/h2>\n
\/**\r\n * Returns movie matching provided title and year.\r\n *\r\n * @param title Title of desired movie.\r\n * @param year Year of desired movie.\r\n * @return Desired movie if match is found; Optional.empty() if no match is found.\r\n *\/\r\npublic Optional<Movie> queryMovieByTitleAndYear(final String title, final int year)\r\n{\r\n   final ResultSet movieResults = client.getSession().execute(\r\n      \"SELECT * from movies_keyspace.movies WHERE title = ? AND year = ?\", title, year);\r\n   final Row movieRow = movieResults.one();\r\n   final Optional<Movie> movie =\r\n        movieRow != null\r\n      ? Optional.of(new Movie(\r\n           movieRow.getString(\"title\"),\r\n           movieRow.getInt(\"year\"),\r\n           movieRow.getString(\"description\"),\r\n           movieRow.getString(\"mmpa_rating\"),\r\n           movieRow.getString(\"dustin_rating\")))\r\n      : Optional.empty();\r\n   return movie;\r\n}<\/pre>\n
If we need to delete data already stored in the Cassandra database, this is easily accomplished as shown in the next code listing.<\/p>\n
Deleting with Cassandra Java Driver<\/h2>\n
\/**\r\n * Deletes the movie with the provided title and release year.\r\n *\r\n * @param title Title of movie to be deleted.\r\n * @param year Year of release of movie to be deleted.\r\n *\/\r\npublic void deleteMovieWithTitleAndYear(final String title, final int year)\r\n{\r\n   final String deleteString = \"DELETE FROM movies_keyspace.movies WHERE title = ? and year = ?\";\r\n   client.getSession().execute(deleteString, title, year);\r\n}<\/pre>\n
As the examples in this blog post have shown, it’s easy to access Cassandra from Java applications using the Java Driver. It is worth noting that Cassandra is written in Java<\/a>. The advantage of this for Java developers is that many of Cassandra’s configuration values are JVM options that Java developers are already familiar with. The cassandra-env.sh<\/code> file in the Cassandra conf<\/code> directory allows one to specify standard JVM options<\/a> used by Cassandra (such as heap sizing parameters -Xms<\/code>, -Xmx<\/code>, and -Xmn<\/code>),HotSpot-specific JVM options<\/a> (such as -XX:-HeapDumpOnOutOfMemoryError<\/code>, -XX:HeapDumpPath<\/code>, garbage collection tuning options<\/a>, and garbage collection logging options<\/a>), enabling assertions<\/a> (-ea<\/code>), and exposing Cassandra for remote JMX management<\/a>.<\/p>\n
Speaking of Cassandra and JMX, Cassandra can be monitored via JMX as discussed in the “Monitoring using JConsole” section of Monitoring a Cassandra cluster<\/a>. The book excerpt<\/a> The Basics of Monitoring Cassandra<\/a> also discusses using JMX to monitor Cassandra. Because Java developers are more likely to be familiar with JMX clients such as JConsole<\/a> and VisualVM<\/a>, this is an intuitive approach to monitoring Cassandra for Java developers.<\/p>\n
Another advantage of Cassandra’s Java roots is that Java classes used by Cassandra can be extended and Cassandra can be customized via Java. For example, custom data types<\/a> can be implemented by extending the AbstractType class<\/a>.<\/p>\n
Conclusion<\/h2>\n
The Cassandra Java Driver makes it easy to access Cassandra from Java applications. Cassandra also features significant Java-based configuration and monitoring and can even be customized with Java.<\/p>\n
\n\n\n\n
Reference: <\/span><\/td>\nConnecting to Cassandra from Java<\/a> from our JCG partner<\/a> Dustin Marx at the Inspired by Actual Events <\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
In my post Hello Cassandra, I looked at downloading the Cassandra NoSQL database and using cqlsh to connect to a Cassandra database. In this post, I look at the basics of connecting to a Cassandra database from a Java client. Although there are several frameworks available for accessing the Cassandra database from Java, I will …<\/p>\n","protected":false},"author":122,"featured_media":53,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[111,113],"class_list":["post-25902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-apache-cassandra","tag-nosql"],"yoast_head":"\nConnecting to Cassandra from Java<\/title>\n<meta name=\"description\" content=\"In my post Hello Cassandra, I looked at downloading the Cassandra NoSQL database and using cqlsh to connect to a Cassandra database. 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