/*
 * Copyright 2012-2019 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
 *
 *      https://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.boot.actuate.cassandra;

import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.querybuilder.QueryBuilder;
import com.datastax.driver.core.querybuilder.Select;

import org.springframework.boot.actuate.health.AbstractHealthIndicator;
import org.springframework.boot.actuate.health.Health;
import org.springframework.boot.actuate.health.HealthIndicator;
import org.springframework.data.cassandra.core.CassandraOperations;
import org.springframework.util.Assert;

/**
 * Simple implementation of a {@link HealthIndicator} returning status information for
 * Cassandra data stores.
 *
 * @author Julien Dubois
 * @since 2.0.0
 */
public class CassandraHealthIndicator extends AbstractHealthIndicator {

	private CassandraOperations cassandraOperations;

	public CassandraHealthIndicator() {
		super("Cassandra health check failed");
	}

	/**
	 * Create a new {@link CassandraHealthIndicator} instance.
	 * @param cassandraOperations the Cassandra operations
	 */
	public CassandraHealthIndicator(CassandraOperations cassandraOperations) {
		super("Cassandra health check failed");
		Assert.notNull(cassandraOperations, "CassandraOperations must not be null");
		this.cassandraOperations = cassandraOperations;
	}

	@Override
	protected void doHealthCheck(Health.Builder builder) throws Exception {
		Select select = QueryBuilder.select("release_version").from("system", "local");
		ResultSet results = this.cassandraOperations.getCqlOperations().queryForResultSet(select);
		if (results.isExhausted()) {
			builder.up();
			return;
		}
		String version = results.one().getString(0);
		builder.up().withDetail("version", version);
	}

}

@@ -701,25 +701,32 @@
 er.core.
-ResultSet
+ConsistencyLevel
 ;%0Aimport
@@ -755,33 +755,66 @@
 ore.
-querybuilder.QueryBuilder
+ResultSet;%0Aimport com.datastax.driver.core.SimpleStatement
 ;%0Aim
@@ -847,26 +847,16 @@
 ore.
-querybuilder.Selec
+Statemen
 t;%0A%0A
@@ -1393,16 +1393,175 @@
 ator %7B%0A%0A
+%09private static final Statement SELECT = new SimpleStatement(%22SELECT release_version FROM system.local%22)%0A%09%09%09.setConsistencyLevel(ConsistencyLevel.LOCAL_ONE);%0A%0A
 %09private
@@ -2151,90 +2151,8 @@
 n %7B%0A
-%09%09Select select = QueryBuilder.select(%22release_version%22).from(%22system%22, %22local%22);%0A
 %09%09Re
@@ -2235,14 +2235,14 @@
 Set(
-select
+SELECT
 );%0A%09
@@ -2260,15 +2260,18 @@
 s.is
-Exhaust
+FullyFetch
 ed()

Use LOCAL_ONE when querying system.local