spark FileSegment 源码
spark FileSegment 代码
文件路径：/core/src/main/scala/org/apache/spark/storage/FileSegment.scala
/*
* 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.io.File
/**
* References a particular segment of a file (potentially the entire file),
* based off an offset and a length.
*/
private[spark] class FileSegment(val file: File, val offset: Long, val length: Long) {
require(offset >= 0, s"File segment offset cannot be negative (got $offset)")
require(length >= 0, s"File segment length cannot be negative (got $length)")
override def toString: String = {
"(name=%s, offset=%d, length=%d)".format(file.getName, offset, length)
}
}
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