| using J2N.Threading.Atomic; |
| using System; |
| using System.Runtime.CompilerServices; |
| |
| namespace Lucene.Net.Util |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// Simple counter class |
| /// <para/> |
| /// @lucene.internal |
| /// @lucene.experimental |
| /// </summary> |
| public abstract class Counter |
| { |
| /// <summary> |
| /// Adds the given delta to the counters current value. |
| /// </summary> |
| /// <param name="delta"> |
| /// The delta to add. </param> |
| /// <returns> The counters updated value. </returns> |
| public abstract long AddAndGet(long delta); |
| |
| /// <summary> |
| /// Gets the counters current value. |
| /// </summary> |
| public abstract long Value { get; } |
| |
| /// <summary> |
| /// Returns the counters current value. |
| /// </summary> |
| /// <returns> The counters current value. </returns> |
| [Obsolete("Use Value instead. This method will be removed in 4.8.0 release candidate.")] |
| public virtual long Get() => Value; |
| |
| /// <summary> |
| /// Returns a new counter. The returned counter is not thread-safe. |
| /// </summary> |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public static Counter NewCounter() |
| { |
| return NewCounter(false); |
| } |
| |
| /// <summary> |
| /// Returns a new counter. |
| /// </summary> |
| /// <param name="threadSafe"> |
| /// <c>true</c> if the returned counter can be used by multiple |
| /// threads concurrently. </param> |
| /// <returns> A new counter. </returns> |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public static Counter NewCounter(bool threadSafe) |
| { |
| return threadSafe ? (Counter)new AtomicCounter() : new SerialCounter(); |
| } |
| |
| /// <summary> |
| /// Returns this counter's <see cref="Value"/> implicitly. |
| /// </summary> |
| /// <param name="counter"></param> |
| public static implicit operator long(Counter counter) => counter.Value; // LUCENENET specific |
| |
| private sealed class SerialCounter : Counter |
| { |
| private long count = 0; |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public override long AddAndGet(long delta) |
| { |
| return count += delta; |
| } |
| |
| public override long Value => count; |
| } |
| |
| private sealed class AtomicCounter : Counter |
| { |
| private readonly AtomicInt64 count = new AtomicInt64(); |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| public override long AddAndGet(long delta) |
| { |
| return count.AddAndGet(delta); |
| } |
| |
| public override long Value => count; |
| } |
| } |
| } |