Add support for Cassandra

Add connectors for Cassandra Cluster instances with Java and XML-based configuration. Cassandra configuration is obtained using the single-tenant Datastax/Cassandra tile.

spring-cloud-core/src/main/java/org/springframework/cloud/service/common/CassandraServiceInfo.java

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+/*
+ * Copyright 2016 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 org.springframework.cloud.service.common;
+
+import java.util.List;
+
+import org.springframework.cloud.service.BaseServiceInfo;
+import org.springframework.cloud.service.ServiceInfo.ServiceLabel;
+
+/**
+ * {@link org.springframework.cloud.service.ServiceInfo} for a Cassandra/Datastax DSE
+ * service.
+ *
+ * @author Mark Paluch
+ */
+@ServiceLabel("cassandra")
+public class CassandraServiceInfo extends BaseServiceInfo {
+
+	private final List<String> contactPoints;
+	private final int port;
+	private final String username;
+	private final String password;
+
+	/**
+	 * Creates a new {@link CassandraServiceInfo} using Contact points and port.
+	 *
+	 * @param id the service-id
+	 * @param contactPoints list of contact-points
+	 * @param port the port
+	 */
+	public CassandraServiceInfo(String id, List<String> contactPoints, int port) {
+		this(id, contactPoints, port, null, null);
+	}
+
+	/**
+	 * Creates a new {@link CassandraServiceInfo} using Contact points with a port and
+	 * username/password credentials.
+	 *
+	 * @param id the service-id
+	 * @param contactPoints list of contact-points
+	 * @param port the port
+	 * @param username the user name
+	 * @param password the password
+	 */
+	public CassandraServiceInfo(String id, List<String> contactPoints, int port,
+			String username, String password) {
+		super(id);
+
+		this.contactPoints = contactPoints;
+		this.port = port;
+		this.username = username;
+		this.password = password;
+	}
+
+	@ServiceProperty(category = "contactpoints")
+	public List<String> getContactPoints() {
+		return contactPoints;
+	}
+
+	@ServiceProperty(category = "port")
+	public int getPort() {
+		return port;
+	}
+
+	@ServiceProperty(category = "username")
+	public String getUsername() {
+		return username;
+	}
+
+	@ServiceProperty(category = "password")
+	public String getPassword() {
+		return password;
+	}
+}

spring-cloud-core/src/test/java/org/springframework/cloud/service/common/CassandraServiceInfoUnitTests.java

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+/*
+ * Copyright 2016 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 org.springframework.cloud.service.common;
+
+import static org.hamcrest.CoreMatchers.*;
+import static org.junit.Assert.assertThat;
+
+import java.util.Collections;
+
+
+import org.junit.Test;
+
+/**
+ * Unit tests for {@link CassandraServiceInfo}.
+ *
+ * @author Mark Paluch
+ */
+public class CassandraServiceInfoUnitTests {
+
+	@Test
+	public void shouldContainContactPointsAndPort() {
+
+		CassandraServiceInfo info = new CassandraServiceInfo("cassandra",
+				Collections.singletonList("10.0.0.1"), 9042);
+
+		assertThat(info.getContactPoints(), hasItem("10.0.0.1"));
+		assertThat(info.getPort(), is(equalTo(9042)));
+	}
+
+	@Test
+	public void shouldContainContactPointsAndPortAndCredentials() {
+
+		CassandraServiceInfo info = new CassandraServiceInfo("cassandra",
+				Collections.singletonList("10.0.0.1"), 9042, "walter", "white");
+
+		assertThat(info.getContactPoints(), hasItem("10.0.0.1"));
+		assertThat(info.getPort(), is(equalTo(9042)));
+		assertThat(info.getUsername(), is(equalTo("walter")));
+		assertThat(info.getPassword(), is(equalTo("white")));
+	}
+}