kafka RequestLocal 源码
kafka RequestLocal 代码
文件路径：/core/src/main/scala/kafka/server/RequestLocal.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.server
import org.apache.kafka.common.utils.BufferSupplier
object RequestLocal {
val NoCaching: RequestLocal = RequestLocal(BufferSupplier.NO_CACHING)
/** The returned instance should be confined to a single thread. */
def withThreadConfinedCaching: RequestLocal = RequestLocal(BufferSupplier.create())
}
/**
* Container for stateful instances where the lifecycle is scoped to one request.
*
* When each request is handled by one thread, efficient data structures with no locking or atomic operations
* can be used (see RequestLocal.withThreadConfinedCaching).
*/
case class RequestLocal(bufferSupplier: BufferSupplier) {
def close(): Unit = bufferSupplier.close()
}
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