kafka Implicits 源码
kafka Implicits 代码
文件路径：/core/src/main/scala/kafka/utils/Implicits.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.utils
import java.util
import java.util.Properties
import scala.annotation.nowarn
import scala.jdk.CollectionConverters._
/**
* In order to have these implicits in scope, add the following import:
*
* `import kafka.utils.Implicits._`
*/
object Implicits {
/**
* The java.util.Properties.putAll override introduced in Java 9 is seen as an overload by the
* Scala compiler causing ambiguity errors in some cases. The `++=` methods introduced via
* implicits provide a concise alternative.
*
* See https://github.com/scala/bug/issues/10418 for more details.
*/
implicit class PropertiesOps(properties: Properties) {
def ++=(props: Properties): Unit =
(properties: util.Hashtable[AnyRef, AnyRef]).putAll(props)
def ++=(map: collection.Map[String, AnyRef]): Unit =
(properties: util.Hashtable[AnyRef, AnyRef]).putAll(map.asJava)
}
/**
* Exposes `forKeyValue` which maps to `foreachEntry` in Scala 2.13 and `foreach` in Scala 2.12
* (with the help of scala.collection.compat). `foreachEntry` avoids the tuple allocation and
* is more efficient.
*
* This was not named `foreachEntry` to avoid `unused import` warnings in Scala 2.13 (the implicit
* would not be triggered in Scala 2.13 since `Map.foreachEntry` would have precedence).
*/
@nowarn("cat=unused-imports")
implicit class MapExtensionMethods[K, V](private val self: scala.collection.Map[K, V]) extends AnyVal {
import scala.collection.compat._
def forKeyValue[U](f: (K, V) => U): Unit = {
self.foreachEntry { (k, v) => f(k, v) }
}
}
}
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