Add Cassandra support

Add auto-configuration support and health checks for Cassandra and
Spring Data Cassandra.

Fixes gh-2064
Closes gh-2214

spring-boot-samples/spring-boot-sample-data-cassandra/src/main/java/sample/data/cassandra/Customer.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2012-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample.data.cassandra;
+
+import java.util.UUID;
+
+import org.springframework.data.cassandra.mapping.PrimaryKey;
+import org.springframework.data.cassandra.mapping.Table;
+
+@Table
+public class Customer {
+
+	@PrimaryKey
+	private UUID id;
+
+	private String firstName;
+
+	private String lastName;
+
+	public Customer() {
+	}
+
+	public Customer(UUID id, String firstName, String lastName) {
+		this.id = id;
+		this.firstName = firstName;
+		this.lastName = lastName;
+	}
+
+	@Override
+	public String toString() {
+		return String.format("Customer[id=%s, firstName='%s', lastName='%s']", this.id,
+				this.firstName, this.lastName);
+	}
+
+}

spring-boot-samples/spring-boot-sample-data-cassandra/src/main/java/sample/data/cassandra/CustomerRepository.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2012-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample.data.cassandra;
+
+import java.util.List;
+
+import org.springframework.data.cassandra.repository.Query;
+import org.springframework.data.repository.CrudRepository;
+
+public interface CustomerRepository extends CrudRepository<Customer, String> {
+
+	@Query("Select * from customer where firstname=?0")
+	public Customer findByFirstName(String firstName);
+
+	@Query("Select * from customer where lastname=?0")
+	public List<Customer> findByLastName(String lastName);
+
+}

spring-boot-samples/spring-boot-sample-data-cassandra/src/main/java/sample/data/cassandra/SampleCassandraApplication.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2012-2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package sample.data.cassandra;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+import com.datastax.driver.core.utils.UUIDs;
+
+@SpringBootApplication
+public class SampleCassandraApplication implements CommandLineRunner {
+
+	@Autowired
+	private CustomerRepository repository;
+
+	@Override
+	public void run(String... args) throws Exception {
+		this.repository.deleteAll();
+
+		// save a couple of customers
+		this.repository.save(new Customer(UUIDs.timeBased(), "Alice", "Smith"));
+		this.repository.save(new Customer(UUIDs.timeBased(), "Bob", "Smith"));
+
+		// fetch all customers
+		System.out.println("Customers found with findAll():");
+		System.out.println("-------------------------------");
+		for (Customer customer : this.repository.findAll()) {
+			System.out.println(customer);
+		}
+		System.out.println();
+
+		// fetch an individual customer
+		System.out.println("Customer found with findByFirstName('Alice'):");
+		System.out.println("--------------------------------");
+		System.out.println(this.repository.findByFirstName("Alice"));
+
+		System.out.println("Customers found with findByLastName('Smith'):");
+		System.out.println("--------------------------------");
+		for (Customer customer : this.repository.findByLastName("Smith")) {
+			System.out.println(customer);
+		}
+	}
+
+	public static void main(String[] args) {
+		SpringApplication.run(SampleCassandraApplication.class, args);
+	}
+
+}