kafka LongRef 源码
kafka LongRef 代码
文件路径：/core/src/main/scala/kafka/common/LongRef.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 kafka.common
/**
* A mutable cell that holds a value of type `Long`. One should generally prefer using value-based programming (i.e.
* passing and returning `Long` values), but this class can be useful in some scenarios.
*
* Unlike `AtomicLong`, this class is not thread-safe and there are no atomicity guarantees.
*/
class LongRef(var value: Long) {
def addAndGet(delta: Long): Long = {
value += delta
value
}
def getAndAdd(delta: Long): Long = {
val result = value
value += delta
result
}
def getAndIncrement(): Long = {
val v = value
value += 1
v
}
def incrementAndGet(): Long = {
value += 1
value
}
def getAndDecrement(): Long = {
val v = value
value -= 1
v
}
def decrementAndGet(): Long = {
value -= 1
value
}
}
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