/// <summary>
/// Handles the signaling of this <see cref="DataWatcher"/>.
/// </summary>
protected override void HandleSignaling()
{
lock (_locker)
{
DateTime utcLastModified = DateTime.UtcNow;
List <object[]> values = new List <object[]>();
DataManager manager = Manager.Clone();
using (DbDataReader reader = manager.ExecuteReader(Command, Parameters))
{
while (reader.Read())
{
object[] readerValues = new object[reader.FieldCount];
reader.GetValues(readerValues);
values.Add(readerValues);
}
}
long currentSignature = StructUtility.GetHashCode64(EnumerableConverter.Parse(values, o => o.GetHashCode()));
values.Clear();
if (Signature == 0)
{
Signature = currentSignature;
}
if (!Signature.Equals(currentSignature))
{
SetUtcLastModified(utcLastModified);
OnChangedRaised();
}
Signature = currentSignature;
}
}
/// <summary>
/// Combines a sequence of objects into one object, and computes a hash value of the specified <paramref name="values"/>.
/// </summary>
/// <param name="values">The objects to compute a hash code for.</param>
/// <param name="setup">The <see cref="HashOptions"/> which need to be configured.</param>
/// <returns>A <see cref="HashResult"/> containing the computed hash value of the specified object sequence <paramref name="values"/>.</returns>
public static HashResult ComputeHash(object[] values, Action <HashOptions> setup = null)
{
Validator.ThrowIfNull(values, nameof(values));
var options = setup.ConfigureOptions();
long signature = StructUtility.GetHashCode64(EnumerableConverter.Parse(values, o => o.GetHashCode()));
return(ComputeHash(BitConverter.GetBytes(signature), o => o.AlgorithmType = options.AlgorithmType));
}
/// <summary>
/// Combines the <paramref name="additionalChecksum"/> to the representation of this instance.
/// </summary>
/// <param name="additionalChecksum">A <see cref="String"/> array that contains zero or more checksums of the additional data this instance must represent.</param>
public ChecksumBuilder CombineWith(params string[] additionalChecksum)
{
List <long> result = new List <long>();
if (additionalChecksum == null)
{
result.Add(StructUtility.HashCodeForNullValue);
}
else
{
for (int i = 0; i < additionalChecksum.Length; i++)
{
result.Add(StructUtility.GetHashCode64(additionalChecksum[i]));
}
}
return(CombineWith(result.ToArray()));
}
/// <summary>
/// Computes and returns a MD5 signature of the following properties: <see cref="P:Cuemon.IO.JsonInstance.Name"/>, <see cref="P:Cuemon.IO.JsonInstance.Value"/>, <see cref="P:Cuemon.IO.JsonInstance.NodeNumber"/> and <see cref="NodeType"/>.
/// </summary>
/// <returns>
/// A MD5 signature of the following properties: <see cref="P:Cuemon.IO.JsonInstance.Name"/>, <see cref="P:Cuemon.IO.JsonInstance.Value"/>, <see cref="P:Cuemon.IO.JsonInstance.NodeNumber"/> and <see cref="NodeType"/>.
/// </returns>
public override string GetSignature()
{
return(StructUtility.GetHashCode64(string.Concat(Name, Value, NodeNumber, Enum.GetName(typeof(XPathNodeType), NodeType))).ToString());
}
private static long GenerateGroupKey(string key, string group)
{
return(StructUtility.GetHashCode64(group == NoGroup ? key : string.Concat(key, group)));
}
/// <summary>
/// Initializes a new instance of the <see cref="CacheValidator"/> class.
/// </summary>
/// <param name="created">A <see cref="DateTime"/> value for when data this instance represents was first created.</param>
/// <param name="modified">A <see cref="DateTime"/> value for when data this instance represents was last modified.</param>
/// <param name="checksum">A <see cref="String"/> value containing a byte-for-byte checksum of the data this instance represents.</param>
/// <param name="setup">The <see cref="CacheValidatorOptions"/> which need to be configured.</param>
public CacheValidator(DateTime created, DateTime?modified, string checksum, Action <CacheValidatorOptions> setup = null)
: this(created, modified, checksum == null ? StructUtility.HashCodeForNullValue : StructUtility.GetHashCode64(checksum), setup)
{
}
/// <summary>
/// Computes and returns a MD5 signature of the following properties: <see cref="Name"/>, <see cref="Value"/> and <see cref="NodeNumber"/>.
/// </summary>
/// <returns>A MD5 signature of the following properties: <see cref="Name"/>, <see cref="Value"/> and <see cref="NodeNumber"/>.</returns>
public virtual string GetSignature()
{
return(StructUtility.GetHashCode64(string.Concat(Name, Value, NodeNumber)).ToString(CultureInfo.InvariantCulture));
}
/// <summary>
/// Initializes a new instance of the <see cref="ChecksumBuilder"/> class.
/// </summary>
/// <param name="checksum">A <see cref="String"/> value containing a byte-for-byte checksum of the data this instance represents.</param>
/// <param name="setup">The <see cref="ChecksumBuilderOptions"/> which need to be configured.</param>
public ChecksumBuilder(string checksum, Action <ChecksumBuilderOptions> setup = null) : this(checksum == null ? StructUtility.HashCodeForNullValue : StructUtility.GetHashCode64(checksum), setup)
{
}
