org.apache.ignite.spark.impl.IgniteSqlRDD.scala Maven / Gradle / Ivy

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Java-based middleware for in-memory processing of big data in a distributed environment.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.ignite.spark.impl

import org.apache.ignite.cache.query.Query
import org.apache.ignite.configuration.CacheConfiguration
import org.apache.ignite.spark.IgniteContext
import org.apache.spark.{TaskContext, Partition}

import scala.reflect.ClassTag

class IgniteSqlRDD[R: ClassTag, T, K, V](
    ic: IgniteContext,
    cacheName: String,
    cacheCfg: CacheConfiguration[K, V],
    var qry: Query[T],
    conv: (T) ⇒ R,
    keepBinary: Boolean,
    partitions: Array[Partition] = Array(IgnitePartition(0))
) extends IgniteAbstractRDD[R, K, V](ic, cacheName, cacheCfg, keepBinary) {
    override def compute(split: Partition, context: TaskContext): Iterator[R] = {
        val cur = ensureCache().query(qry)

        TaskContext.get().addTaskCompletionListener((_) ⇒ cur.close())

        new IgniteQueryIterator[T, R](cur.iterator(), conv)
    }

    override protected def getPartitions: Array[Partition] = partitions
}

object IgniteSqlRDD {
    def apply[R: ClassTag, T, K, V](ic: IgniteContext, cacheName: String, cacheCfg: CacheConfiguration[K, V],
        qry: Query[T], conv: (T) ⇒ R, keepBinary: Boolean,
        partitions: Array[Partition] = Array(IgnitePartition(0))): IgniteSqlRDD[R, T, K, V] =
        new IgniteSqlRDD(ic, cacheName, cacheCfg, qry, conv, keepBinary, partitions)
}