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CassandraInstance.scala
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CassandraInstance.scala
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/*
* Copyright 2016 Azavea
*
* 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 geotrellis.store.cassandra
import geotrellis.store.cassandra.conf.CassandraConfig
import com.datastax.oss.driver.api.core.CqlSession
import com.datastax.oss.driver.api.querybuilder.SchemaBuilder
import scala.collection.JavaConverters._
import java.net.{InetSocketAddress, URI}
object CassandraInstance {
def apply(uri: URI): CassandraInstance = {
import geotrellis.util.UriUtils._
val zookeeper = uri.getHost
val (user, pass) = getUserInfo(uri)
BaseCassandraInstance(
List(zookeeper),
user.getOrElse(""),
pass.getOrElse("")
)
}
}
trait CassandraInstance extends Serializable {
val cassandraConfig: CassandraConfig
/** Session constructor */
def getSession: () => CqlSession
@transient lazy val session: CqlSession = getSession()
def ensureKeyspaceExists(keyspace: String, session: CqlSession): Unit =
session.execute(
SchemaBuilder
.createKeyspace(keyspace)
.ifNotExists()
.withReplicationOptions(cassandraConfig.replicationOptions.asJava)
.build()
)
def dropKeyspace(keyspace: String, session: CqlSession): Unit =
session.execute(s"drop keyspace if exists $keyspace;")
/** Without session close, for a manual session control */
def withSession[T](block: CqlSession => T): T = block(session)
/** With session close */
def withSessionDo[T](block: CqlSession => T): T = {
val session = getSession()
try block(session) finally session.closeAsync()
}
def closeAsync = session.closeAsync()
}
case class BaseCassandraInstance(
getSession: () => CqlSession,
cassandraConfig: CassandraConfig
) extends CassandraInstance
object BaseCassandraInstance {
def apply(getSession: () => CqlSession): BaseCassandraInstance =
BaseCassandraInstance(getSession, CassandraConfig)
def apply(
hosts: Seq[String],
username: String,
password: String,
cassandraConfig: CassandraConfig
): BaseCassandraInstance = {
def getSession: () => CqlSession = () => {
val builder =
CqlSession
.builder()
.addContactPoints(hosts.map(InetSocketAddress.createUnresolved(_, cassandraConfig.port)).asJava)
val authedBuilder =
if(username.nonEmpty && password.nonEmpty) builder.withAuthCredentials(username, password)
else builder
authedBuilder.build()
}
BaseCassandraInstance(getSession, cassandraConfig)
}
def apply(
hosts: Seq[String],
username: String,
password: String
): BaseCassandraInstance = apply(hosts, username, password, CassandraConfig)
def apply(
hosts: Seq[String],
cassandraConfig: CassandraConfig
): BaseCassandraInstance = apply(hosts, "", "", cassandraConfig)
def apply(hosts: Seq[String]): BaseCassandraInstance = apply(hosts, CassandraConfig)
}
object Cassandra {
implicit def instanceToSession[T <: CassandraInstance](instance: T): CqlSession = instance.session
def withCassandraInstance[T <: CassandraInstance, K](instance: T)(block: T => K): K = block(instance)
def withCassandraInstanceDo[T <: CassandraInstance, K](instance: T)(block: T => K): K = try block(instance) finally instance.closeAsync()
def withBaseCassandraInstance[K](hosts: Seq[String],
username: String,
password: String,
cassandraConfig: CassandraConfig)(block: CassandraInstance => K): K =
block(BaseCassandraInstance(hosts, username, password, cassandraConfig))
def withBaseCassandraInstance[K](hosts: Seq[String], cassandraConfig: CassandraConfig)(block: CassandraInstance => K): K =
withBaseCassandraInstance(hosts, "", "", cassandraConfig)(block)
def withBaseCassandraInstance[K](hosts: Seq[String],
username: String,
password: String)(block: CassandraInstance => K): K =
withBaseCassandraInstance(hosts, username, password, CassandraConfig)(block)
def withBaseCassandraInstance[K](hosts: Seq[String])(block: CassandraInstance => K): K =
withBaseCassandraInstance(hosts, "", "", CassandraConfig)(block)
def withBaseCassandraInstanceDo[K](hosts: Seq[String],
username: String,
password: String,
cassandraConfig: CassandraConfig)(block: CassandraInstance => K): K = {
val instance = BaseCassandraInstance(hosts, username, password, cassandraConfig)
try block(instance) finally instance.closeAsync()
}
def withBaseCassandraInstanceDo[K](hosts: Seq[String],
username: String,
password: String)(block: CassandraInstance => K): K =
withBaseCassandraInstanceDo(hosts, username, password, CassandraConfig)(block)
def withBaseCassandraInstanceDo[K](hosts: Seq[String])(block: CassandraInstance => K): K =
withBaseCassandraInstanceDo(hosts, "", "", CassandraConfig)(block)
def withBaseCassandraInstanceDo[K](hosts: Seq[String],
cassandraConfig: CassandraConfig)(block: CassandraInstance => K): K = {
withBaseCassandraInstanceDo(hosts, "", "", cassandraConfig)(block)
}
}