/// <summary>
/// Initializes a new instance of the <see cref="JsonStoreWriter"/> class.
/// </summary>
/// <param name="name">The name of the application that generated the persisted files, or the root name of the files.</param>
/// <param name="path">The directory in which the main persisted file resides or will reside, or null to create a volatile data store.</param>
/// <param name="createSubdirectory">If true, a numbered subdirectory is created for this store.</param>
/// <param name="extension">The extension for the underlying file.</param>
public JsonStoreWriter(string name, string path, bool createSubdirectory = true, string extension = DefaultExtension)
: base(extension)
{
ushort id = 0;
this.Name = name;
this.Path = System.IO.Path.GetFullPath(path);
if (createSubdirectory)
{
// if the root directory already exists, look for the next available id
if (Directory.Exists(this.Path))
{
var existingIds = Directory.EnumerateDirectories(this.Path, this.Name + ".????")
.Select(d => d.Split('.').Last())
.Where(n => ushort.TryParse(n, out ushort i))
.Select(n => ushort.Parse(n));
id = (ushort)(existingIds.Count() == 0 ? 0 : existingIds.Max() + 1);
}
this.Path = System.IO.Path.Combine(this.Path, $"{this.Name}.{id:0000}");
}
if (!Directory.Exists(this.Path))
{
Directory.CreateDirectory(this.Path);
}
string dataPath = System.IO.Path.Combine(this.Path, StoreCommon.GetDataFileName(this.Name) + this.Extension);
this.streamWriter = File.CreateText(dataPath);
this.jsonWriter = new JsonTextWriter(this.streamWriter);
this.jsonWriter.WriteStartArray();
}
/// <summary>
/// Seek to envelope in stream according to specified replay descriptor.
/// </summary>
/// <param name="descriptor">The replay descriptor.</param>
public void Seek(ReplayDescriptor descriptor)
{
this.descriptor = descriptor;
// load data
string dataPath = System.IO.Path.Combine(this.Path, StoreCommon.GetDataFileName(this.Name) + this.Extension);
this.streamReader?.Dispose();
this.streamReader = File.OpenText(dataPath);
this.jsonReader = new JsonTextReader(this.streamReader);
this.validatingReader = new JSchemaValidatingReader(this.jsonReader)
{
Schema = this.DataSchema
};
this.validatingReader.ValidationEventHandler += (s, e) => throw new InvalidDataException(e.Message);
// iterate through data store until we either reach the end or we find the start of the replay descriptor
while (this.validatingReader.Read())
{
// data stores are arrays of messages, messages start as objects
if (this.validatingReader.TokenType == JsonToken.StartObject)
{
// read envelope
if (!this.validatingReader.Read() || !this.ReadEnvelope(out this.envelope))
{
throw new InvalidDataException("Messages must be an ordered object: {\"Envelope\": <Envelope>, \"Data\": <Data>}. Deserialization needs to read the envelope before the data to know what type of data to deserialize.");
}
if (this.descriptor.Interval.Left < (descriptor.UseOriginatingTime ? this.envelope.OriginatingTime : this.envelope.Time))
{
// found start of interval
break;
}
// skip data
if (!this.ReadData(out this.data))
{
throw new InvalidDataException("Messages must be an ordered object: {\"Envelope\": <Envelope>, \"Data\": <Data>}. Deserialization needs to read the envelope before the data to know what type of data to deserialize.");
}
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="JsonStoreWriter"/> class.
/// </summary>
/// <param name="name">The name of the application that generated the persisted files, or the root name of the files</param>
/// <param name="path">The directory in which the main persisted file resides or will reside, or null to create a volatile data store</param>
/// <param name="dataSchemaString">JSON schema used to validate data stream.</param>
/// <param name="createSubdirectory">If true, a numbered subdirectory is created for this store</param>
/// <param name="extension">The extension for the underlying file.</param>
/// <param name="preloadSchemas">Dictionary of URis to JSON schemas to preload before validating any JSON. Would likely include schemas references by the catalog and data schemas.</param>
public JsonStoreWriter(string name, string path, string dataSchemaString, bool createSubdirectory = true, string extension = DefaultExtension, IDictionary <Uri, string> preloadSchemas = null)
: base(dataSchemaString, extension, preloadSchemas)
{
ushort id = 0;
this.Name = name;
this.Path = System.IO.Path.GetFullPath(path);
if (createSubdirectory)
{
// if the root directory already exists, look for the next available id
if (Directory.Exists(this.Path))
{
var existingIds = Directory.EnumerateDirectories(this.Path, this.Name + ".????")
.Select(d => d.Split('.').Last())
.Where(n => ushort.TryParse(n, out ushort i))
.Select(n => ushort.Parse(n));
id = (ushort)(existingIds.Count() == 0 ? 0 : existingIds.Max() + 1);
}
this.Path = System.IO.Path.Combine(this.Path, $"{this.Name}.{id:0000}");
}
if (!Directory.Exists(this.Path))
{
Directory.CreateDirectory(this.Path);
}
string dataPath = System.IO.Path.Combine(this.Path, StoreCommon.GetDataFileName(this.Name) + this.Extension);
this.streamWriter = File.CreateText(dataPath);
this.jsonWriter = new JsonTextWriter(this.streamWriter);
this.validatingWriter = new JSchemaValidatingWriter(this.jsonWriter);
this.validatingWriter.Schema = this.DataSchema;
this.validatingWriter.ValidationEventHandler += (s, e) => throw new InvalidDataException(e.Message);
this.validatingWriter.WriteStartArray();
}
