spark ByteUnit 源码
spark ByteUnit 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/util/ByteUnit.java
/*
* 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.network.util;
public enum ByteUnit {
BYTE(1),
KiB(1L << 10),
MiB(1L << 20),
GiB(1L << 30),
TiB(1L << 40),
PiB(1L << 50);
ByteUnit(long multiplier) {
this.multiplier = multiplier;
}
// Interpret the provided number (d) with suffix (u) as this unit type.
// E.g. KiB.interpret(1, MiB) interprets 1MiB as its KiB representation = 1024k
public long convertFrom(long d, ByteUnit u) {
return u.convertTo(d, this);
}
// Convert the provided number (d) interpreted as this unit type to unit type (u).
public long convertTo(long d, ByteUnit u) {
if (multiplier > u.multiplier) {
long ratio = multiplier / u.multiplier;
if (Long.MAX_VALUE / ratio < d) {
throw new IllegalArgumentException("Conversion of " + d + " exceeds Long.MAX_VALUE in "
+ name() + ". Try a larger unit (e.g. MiB instead of KiB)");
}
return d * ratio;
} else {
// Perform operations in this order to avoid potential overflow
// when computing d * multiplier
return d / (u.multiplier / multiplier);
}
}
public long toBytes(long d) {
if (d < 0) {
throw new IllegalArgumentException("Negative size value. Size must be positive: " + d);
}
return d * multiplier;
}
public long toKiB(long d) { return convertTo(d, KiB); }
public long toMiB(long d) { return convertTo(d, MiB); }
public long toGiB(long d) { return convertTo(d, GiB); }
public long toTiB(long d) { return convertTo(d, TiB); }
public long toPiB(long d) { return convertTo(d, PiB); }
private final long multiplier;
}
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