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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.spark.storage
import java.nio.ByteBuffer
import scala.collection.mutable.ArrayBuffer
import org.apache.spark.Logging
/**
* Abstract class to store blocks
*/
private[spark]
abstract class BlockStore(val blockManager: BlockManager) extends Logging {
def putBytes(blockId: BlockId, bytes: ByteBuffer, level: StorageLevel)
/**
* Put in a block and, possibly, also return its content as either bytes or another Iterator.
* This is used to efficiently write the values to multiple locations (e.g. for replication).
*
* @return a PutResult that contains the size of the data, as well as the values put if
* returnValues is true (if not, the result's data field can be null)
*/
def putValues(blockId: BlockId, values: ArrayBuffer[Any], level: StorageLevel,
returnValues: Boolean) : PutResult
/**
* Return the size of a block in bytes.
*/
def getSize(blockId: BlockId): Long
def getBytes(blockId: BlockId): Option[ByteBuffer]
def getValues(blockId: BlockId): Option[Iterator[Any]]
/**
* Remove a block, if it exists.
* @param blockId the block to remove.
* @return True if the block was found and removed, False otherwise.
*/
def remove(blockId: BlockId): Boolean
def contains(blockId: BlockId): Boolean
def clear() { }
}
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