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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 spark.storage
import java.nio.ByteBuffer
/**
* An interface for writing JVM objects to some underlying storage. This interface allows
* appending data to an existing block, and can guarantee atomicity in the case of faults
* as it allows the caller to revert partial writes.
*
* This interface does not support concurrent writes.
*/
abstract class BlockObjectWriter(val blockId: String) {
var closeEventHandler: () => Unit = _
def open(): BlockObjectWriter
def close() {
closeEventHandler()
}
def isOpen: Boolean
def registerCloseEventHandler(handler: () => Unit) {
closeEventHandler = handler
}
/**
* Flush the partial writes and commit them as a single atomic block. Return the
* number of bytes written for this commit.
*/
def commit(): Long
/**
* Reverts writes that haven't been flushed yet. Callers should invoke this function
* when there are runtime exceptions.
*/
def revertPartialWrites()
/**
* Writes an object.
*/
def write(value: Any)
/**
* Size of the valid writes, in bytes.
*/
def size(): Long
}
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