common/scala/src/main/scala/whisk/common/RingBuffer.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 whisk.common

import org.apache.commons.collections.buffer.CircularFifoBuffer

object RingBuffer {
  def apply[T](size: Int) = new RingBuffer[T](size)
}

class RingBuffer[T](size: Int) {
  private val inner = new CircularFifoBuffer(size)

  def add(el: T) = inner.add(el)

  def toList() = inner.toArray().asInstanceOf[Array[T]].toList
}