/// <summary>
/// Get the data associated with the specified key.
/// If the key is not present or the data value is null then the
/// return value will be <code>default(T)</code>.
/// </summary>
/// <typeparam name="T">
/// The type of the data to return.
/// </typeparam>
/// <param name="key">
/// The key used to access the data.
/// </param>
/// <returns>
/// The data.
/// </returns>
/// <exception cref="InvalidCastException">
/// Thrown if the data object stored under the name of the key
/// cannot be cast to the expected type T.
/// </exception>
/// <exception cref="ArgumentNullException">
/// Thrown if the key argument is null
/// </exception>
/// <exception cref="ArgumentException">
/// Thrown if the Name property of the key argument is null
/// </exception>
/// <exception cref="KeyNotFoundException">
/// Thrown if the map does not contain an entry for the key
/// </exception>
public T Get <T>(ITypedKey <T> key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
if (key.Name == null)
{
throw new ArgumentException(Messages.ExceptionKeyNameNull,
nameof(key));
}
T result = default(T);
if (_data.ContainsKey(key.Name))
{
object obj = _data[key.Name];
if (obj != null)
{
result = (T)obj;
}
}
else
{
throw new KeyNotFoundException(GetKeyMissingMessage(key.Name));
}
return(result);
}
private Func <Task> CreateDeleteFunction(ITypedKey <TKey, TMeasureType> key, ContinuationToken token, List <TEntry> entries)
{
if (entries.Count == 0)
{
return(() => Task.FromResult(0));
}
else
{
DateTime from;
DateTime to;
var ts1 = ((IEntry)entries[0]).GetTimestamp();
var ts2 = ((IEntry)entries[entries.Count - 1]).GetTimestamp();
if (ts1 >= ts2)
{
to = ts1;
from = ts2;
}
else
{
to = ts2;
from = ts1;
}
to = to.AddTicks(1);
// TODO: Implement DeleteInternalAsync
return(() => this.DeleteInternalAsync(key, from, to));
}
}
/// <summary>
/// Add the specified element data to the internal map.
/// </summary>
/// <typeparam name="T">
/// The type of the data being stored.
/// </typeparam>
/// <param name="key">
/// The key to use when storing the data.
/// </param>
/// <param name="dataFactory">
/// The method to use to create a new data to store if one does not
/// already exist.
/// </param>
/// <returns>
/// Existing data matching the key, or newly added data.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown if the supplied data factory is null
/// </exception>
public T GetOrAdd <T>(ITypedKey <T> key, Func <IPipeline, T> dataFactory)
where T : IElementData
{
if (dataFactory == null)
{
throw new ArgumentNullException(nameof(dataFactory));
}
T data = default(T);
if (_data.TryGetValue(key, out data) == false)
{
if (Pipeline.IsConcurrent == true)
{
lock (_dataLock)
{
if (_data.TryGetValue(key, out data) == false)
{
data = dataFactory(Pipeline);
_data.Add(key, data);
}
}
}
else
{
data = dataFactory(Pipeline);
_data.Add(key, data);
}
}
return(data);
}
private async Task DeleteInternalAsync(ITypedKey <TKey, TMeasureType> id, DateTime from, DateTime to)
{
using (await _cc.WriteAsync().ConfigureAwait(false))
{
await CreateDatabase().ConfigureAwait(false);
var resultSet = await _client.ReadAsync <TEntry>(_database, CreateDeleteQuery( new[] { id }, from, to )).ConfigureAwait(false);
}
}
/// <summary>
/// Add the specified data to the collection using the specified key.
/// </summary>
/// <typeparam name="T">
/// The type of the data being stored.
/// </typeparam>
/// <param name="key">
/// The key used to identify the data.
/// </param>
/// <param name="data">
/// The data to store.
/// </param>
public void Add <T>(ITypedKey <T> key, T data)
{
if (_data.ContainsKey(key.Name) == false)
{
_data.Add(key.Name, data);
}
else
{
_data[key.Name] = data;
}
}
/// <summary>
/// Get the <see cref="IElementData"/> instance containing data
/// populated by the specified element.
/// </summary>
/// <typeparam name="T">
/// The expected type of the data to be returned.
/// </typeparam>
/// <param name="key">
/// An <see cref="ITypedKey{T}"/> indicating the element
/// to get data from.
/// </param>
/// <returns>
/// An instance of type T containing the data.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Thrown if the supplied key is null
/// </exception>
/// <exception cref="PipelineException">
/// Thrown if this FlowData instance has not been processed yet.
/// </exception>
public T Get <T>(ITypedKey <T> key) where T : IElementData
{
if (_processed == false)
{
throw new PipelineException(Messages.ExceptionFlowDataNotYetProcessed);
}
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
return(_data.Get(key));
}
private SegmentedReadResult <TKey, TEntry> Convert(ITypedKey <TKey, TMeasureType> id, InfluxResultSet <TEntry> resultSet, int segmentSize)
{
var list = resultSet.Results.FirstOrDefault()?.Series.FirstOrDefault()?.Rows;
var entries = list;
DateTime?to = null;
if (entries.Count > 0)
{
to = ((IEntry)entries[entries.Count - 1]).GetTimestamp();
}
var continuationToken = new ContinuationToken(entries.Count == segmentSize, to);
return(new SegmentedReadResult <TKey, TEntry>(id.Key, Sort.Descending, continuationToken, entries, CreateDeleteFunction(id, continuationToken, entries)));
}
private string CreateSegmentedSelectQuery(ITypedKey <TKey, TMeasureType> id, DateTime?from, DateTime?to, int take, bool reverse, bool isFirstSegment)
{
var key = id.Key;
var measureType = id.GetMeasureType();
if (!reverse || isFirstSegment)
{
if (from.HasValue && to.HasValue)
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND '{from.Value.ToIso8601()}' <= time AND time < '{to.Value.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
else if (!from.HasValue && to.HasValue)
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND time < '{to.Value.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
else if (from.HasValue && !to.HasValue)
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND '{from.Value.ToIso8601()}' <= time AND time < '{_maxTo.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
else
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND time < '{_maxTo.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
}
else
{
if (from.HasValue && to.HasValue)
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND '{from.Value.ToIso8601()}' < time AND time < '{to.Value.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
else if (!from.HasValue && to.HasValue)
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND time < '{to.Value.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
else if (from.HasValue && !to.HasValue)
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND '{from.Value.ToIso8601()}' < time AND time < '{_maxTo.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
else
{
return($"SELECT {CreateDefaultFieldQuery( measureType.GetFields() )} FROM \"{measureType.GetName()}\" WHERE {CreateDefaultTagFilter( id.Key )} AND time < '{_maxTo.ToIso8601()}' ORDER BY time {( reverse ? "ASC" : "DESC" )} LIMIT {take}");
}
}
}
/// <summary>
/// Check if the map contains an item with the specified
/// key name and type. If it does exist, retrieve it.
/// </summary>
/// <param name="key">
/// The key to check for.
/// </param>
/// <param name="value">
/// The value associated with the key.
/// </param>
/// <returns>
/// True if an entry matching the key exists in the map.
/// False otherwise.
/// </returns>
public bool TryGetValue <T>(ITypedKey <T> key, out T value)
{
bool result = false;
value = default(T);
object valueObj = null;
if (_data.TryGetValue(key.Name, out valueObj))
{
if (typeof(T).IsAssignableFrom(valueObj.GetType()))
{
value = (T)valueObj;
result = true;
}
}
return(result);
}
/// <summary>
/// Check if the flow data contains an item with the specified
/// key name and type. If it does exist, retrieve it.
/// </summary>
/// <param name="key">
/// The key to check for.
/// </param>
/// <param name="value">
/// The value associated with the key.
/// </param>
/// <returns>
/// True if an entry matching the key exists, false otherwise.
/// </returns>
public bool TryGetValue <T>(ITypedKey <T> key, out T value)
where T : IElementData
{
return(_data.TryGetValue(key, out value));
}
internal TypedReadResult <TKey, TEntry, TMeasureType> AsTaggedResult <TMeasureType>(ITypedKey <TKey, TMeasureType> typedKey)
where TMeasureType : IMeasureType
{
return(new TypedReadResult <TKey, TEntry, TMeasureType>(typedKey, Sort, Entries));
}
internal TypedReadResult(ITypedKey <TKey, TMeasureType> typedKey, Sort sort, List <TEntry> entries)
{
TypedKey = typedKey;
Sort = sort;
Entries = entries;
}
