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ClaimStrategy.scala
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ClaimStrategy.scala
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/*
* Copyright 2011 LMAX Ltd., ported to Scala by Jamie Allen
*
* Licensed 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 com.jamieallen.sdisruptor
import java.util.concurrent.atomic.AtomicLong;
object ClaimStrategy {
val MultiThreaded = "multiThreaded"
val SingleThreaded = "singleThreaded"
def newInstance(option: String): ClaimStrategy = {
option match {
case SingleThreaded => new SingleThreadedStrategy
case MultiThreaded => new MultiThreadedStrategy
}
}
/** Optimised strategy can be used when there is a single producer thread claiming {@link AbstractEntry}s.
*/
class SingleThreadedStrategy extends ClaimStrategy {
private var _sequence = -1L
override def incrementAndGet() = {
_sequence += 1
_sequence
}
override def incrementAndGet(delta: Int) = {
_sequence += delta
_sequence
}
override def sequence_(sequence: Long) { _sequence = sequence }
}
/** Strategy to be used when there are multiple producer threads claiming {@link AbstractEntry}s.
*/
class MultiThreadedStrategy extends ClaimStrategy {
private val _sequence = new AtomicLong(-1L)
override def incrementAndGet() = _sequence.incrementAndGet
override def incrementAndGet(delta: Int) = _sequence.addAndGet(delta)
override def sequence_(sequence: Long) { _sequence.set(sequence) }
}
}
/** Strategies employed for claiming the sequence of {@link AbstractEntry}s in the {@link RingBuffer} by producers.
*/
trait ClaimStrategy {
/** Claim the next sequence index in the {@link RingBuffer} and increment.
*
* @return the {@link AbstractEntry} index to be used for the producer.
*/
def incrementAndGet(): Long
/** Increment by a delta and get the result.
*
* @param delta to increment by.
* @return the result after incrementing.
*/
def incrementAndGet(delta: Int): Long
/** Set the current sequence value for claiming {@link AbstractEntry} in the {@link RingBuffer}
*
* @param sequence to be set as the current value.
*/
def sequence_(sequence: Long)
}