spark MutableCheckedOutputStream 源码
spark MutableCheckedOutputStream 代码
文件路径：/core/src/main/scala/org/apache/spark/io/MutableCheckedOutputStream.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.io
import java.io.OutputStream
import java.util.zip.Checksum
/**
* A variant of [[java.util.zip.CheckedOutputStream]] which can
* change the checksum calculator at runtime.
*/
private[spark] class MutableCheckedOutputStream(out: OutputStream) extends OutputStream {
private var checksum: Checksum = _
def setChecksum(c: Checksum): Unit = {
this.checksum = c
}
override def write(b: Int): Unit = {
assert(checksum != null, "Checksum is not set.")
checksum.update(b)
out.write(b)
}
override def write(b: Array[Byte], off: Int, len: Int): Unit = {
assert(checksum != null, "Checksum is not set.")
checksum.update(b, off, len)
out.write(b, off, len)
}
override def flush(): Unit = out.flush()
override def close(): Unit = out.close()
}
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