| // 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. |
| |
| using System; |
| using System.Collections.Generic; |
| using System.Linq; |
| using System.Threading; |
| using Org.Apache.REEF.Utilities.Logging; |
| |
| namespace Org.Apache.REEF.Tang.Util |
| { |
| public sealed class MonotonicHashSet<T> : HashSet<T> |
| { |
| private static readonly Logger LOGGER = Logger.GetLogger(typeof(MonotonicHashSet<T>)); |
| private readonly ReaderWriterLockSlim _lock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion); |
| |
| public MonotonicHashSet() |
| { |
| } |
| |
| public MonotonicHashSet(IEnumerable<T> collection) |
| : base(collection) |
| { |
| } |
| |
| public MonotonicHashSet(T[] collection) |
| : base(collection.ToList()) |
| { |
| } |
| |
| public new bool Add(T e) |
| { |
| _lock.EnterWriteLock(); |
| |
| try |
| { |
| if (Contains(e)) |
| { |
| var ex = new ArgumentException("Attempt to re-add " + e |
| + " to MonotonicSet!"); |
| Utilities.Diagnostics.Exceptions.Throw(ex, LOGGER); |
| } |
| return base.Add(e); |
| } |
| finally |
| { |
| if (_lock.IsWriteLockHeld) |
| { |
| _lock.ExitWriteLock(); |
| } |
| } |
| } |
| |
| public bool AddAll(ICollection<T> c) |
| { |
| _lock.EnterWriteLock(); |
| try |
| { |
| foreach (T t in c) |
| { |
| if (Contains(t)) |
| { |
| var ex = new ArgumentException("Attempt to re-add " + t |
| + " to MonotonicSet!"); |
| Utilities.Diagnostics.Exceptions.Throw(ex, LOGGER); |
| } |
| base.Add(t); |
| } |
| } |
| finally |
| { |
| if (_lock.IsWriteLockHeld) |
| { |
| _lock.ExitWriteLock(); |
| } |
| } |
| return c.Count != 0; |
| } |
| |
| public bool ContainsAll(ICollection<T> c) |
| { |
| _lock.EnterReadLock(); |
| |
| try |
| { |
| foreach (T t in c) |
| { |
| if (!Contains(t)) |
| { |
| return false; |
| } |
| } |
| } |
| finally |
| { |
| if (_lock.IsReadLockHeld) |
| { |
| _lock.ExitReadLock(); |
| } |
| } |
| return true; |
| } |
| |
| public new void Clear() |
| { |
| Utilities.Diagnostics.Exceptions.Throw(new NotSupportedException("Attempt to clear MonotonicSet!"), LOGGER); |
| } |
| |
| public bool Remove(object o) |
| { |
| Utilities.Diagnostics.Exceptions.Throw(new NotSupportedException("Attempt to remove " + o + " from MonotonicSet!"), LOGGER); |
| return false; |
| } |
| } |
| } |