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AppMetric.cs
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AppMetric.cs
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//
// BSD 3-Clause License
//
// Copyright (c) 2020-2022, Boia Alexandru
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
namespace LVD.Stakhanovise.NET.Model
{
public class AppMetric : IEquatable<AppMetric>
{
private long mValue = 0;
private IAppMetricId mId;
public AppMetric ( IAppMetricId id )
: this( id, 0 )
{
return;
}
public AppMetric ( IAppMetricId id, long value )
{
mId = id ?? throw new ArgumentNullException( nameof( id ) );
mValue = value;
}
public long Update ( long value )
{
return Interlocked.Exchange( ref mValue, value );
}
public long Add ( long amount )
{
return Interlocked.Add( ref mValue, amount );
}
public AppMetric JoinWith ( AppMetric other )
{
if ( other == null )
throw new ArgumentNullException( nameof( other ) );
if ( !Id.Equals( other.Id ) )
throw new InvalidOperationException( "Cannot join with a metric that has a different ID" );
AppMetric thisCopy = Copy();
AppMetric otherCopy = other.Copy();
return new AppMetric( thisCopy.Id, otherCopy.Value + thisCopy.Value );
}
public long Max ( long newValue )
{
long initialValue,
previousValue;
do
{
initialValue = Interlocked.Read( ref mValue );
if ( initialValue >= newValue )
return initialValue;
}
while ( ( previousValue = Interlocked.CompareExchange( ref mValue, newValue, initialValue ) )
!= initialValue );
return previousValue;
}
public long Min ( long newValue )
{
long initialValue,
previousValue;
do
{
initialValue = Interlocked.Read( ref mValue );
if ( initialValue <= newValue )
return initialValue;
}
while ( ( previousValue = Interlocked.CompareExchange( ref mValue, newValue, initialValue ) )
!= initialValue );
return previousValue;
}
public long Increment ()
{
return Interlocked.Increment( ref mValue );
}
public long Decrement ()
{
return Interlocked.Decrement( ref mValue );
}
public AppMetric Copy ()
{
return new AppMetric( Id, Interlocked.Read( ref mValue ) );
}
public bool Equals ( AppMetric other )
{
return other != null
&& Id.Equals( other.Id )
&& Value == other.Value;
}
public override bool Equals ( object obj )
{
return Equals( obj as AppMetric );
}
public override int GetHashCode ()
{
int result = 1;
result = result * 13 + mId.GetHashCode();
result = result * 13 + mValue.GetHashCode();
return result;
}
public IAppMetricId Id => mId;
public long Value => mValue;
}
}