/// <summary>
/// Loads the configuration.
/// </summary>
/// <param name="path">Path to the directory containing configuration information.</param>
/// <param name="sections">Collection of keyed ConfigurationSections.</param>
/// <remarks>Loads the configuration with the same name as the service type (e.g. [ServiceTypeName].XML. This
/// method was constructed this way to enable some level of unit testing. ConfigurationSection cannot be created or mocked.</remarks>
internal void LoadConfiguration(string path, KeyedCollection <string, ConfigurationSection> sections)
{
Guard.ArgumentNotNullOrWhitespace(path, nameof(path));
Guard.ArgumentNotNull(sections, nameof(sections));
_eventSource?.ServicePartitionConfigurationChanged(_serviceName, _partitionId, _replicaOrInstanceId);
try
{
// Create an MD5 to hash the values to determine if they have changed.
using (MD5 md5 = MD5.Create())
{
// First load the configuration section for this service type.
if (sections.Contains(_serviceNameUri.AbsoluteUri))
{
// Get the section and calculate the hash.
ConfigurationSection section = sections[_serviceNameUri.AbsoluteUri];
string sectionContent = string.Join("|", section.Parameters.Select(p => $"{p.Name}~{p.Value}"));
byte[] hash = md5.ComputeHash(Encoding.UTF8.GetBytes(sectionContent));
if (false == CompareHashes(hash, _configSectionHash))
{
// Set the provider values.
_configSection = section;
_configSectionHash = hash;
// If necessary, call the property changed event.
OnConfigurationPropertyChangedEvent?.Invoke(this, EventArgs.Empty);
}
}
// Second, attempt to load a file of the format <service name>.json. Use the last segment of the service name Uri for the file name.
string filepath = Path.Combine(path, $"{_serviceName}.json");
// Stream the file while calculating the MD5 hash of the contents.
using (FileStream fs = new FileStream(filepath, FileMode.Open, FileAccess.Read))
using (CryptoStream cs = new CryptoStream(fs, md5, CryptoStreamMode.Read))
using (StreamReader reader = new StreamReader(cs))
{
string json = reader.ReadToEnd();
JsonSerializerSettings settings = new JsonSerializerSettings();
settings.Converters.Add(new IsoDateTimeConverter());
TConfiguration result = JsonConvert.DeserializeObject <TConfiguration>(json, settings);
byte[] fileHash = md5.Hash;
if (false == CompareHashes(fileHash, _configFileHash))
{
// If necessary, call the class changed event.
OnConfigurationClassChangedEvent?.Invoke(this, new ConfigurationClassChangedEventArgs <TConfiguration>(_serviceName, _configFile, result));
// Set the provider values.
_configFileHash = fileHash;
_configFile = result;
}
}
}
}
catch (FileNotFoundException) { }
}
/// <summary>
/// QueueService constructor.
/// </summary>
/// <param name="context">StatefulServiceContext instance.</param>
/// <param name="eventSource">IStatefulServiceEventSource instance for diagnostic logging.</param>
public GenericInt64PartitionService(StatefulServiceContext context, IServiceEventSource eventSource)
: base(context)
{
// Check passed parameters.
Guard.ArgumentNotNull(context, nameof(context));
Guard.ArgumentNotNull(eventSource, nameof(eventSource));
_eventSource = eventSource;
TokenSource = new CancellationTokenSource();
// Parse the service name into an application name.
string appName = (Context.ServiceName.Segments.Length > 2) ? Context.ServiceName.Segments[1].Replace("/", "") : "";
Application = new Uri($"fabric:/{appName}");
ConfigurationProvider = new ConfigurationProvider <TConfiguration>(context.ServiceName, context.CodePackageActivationContext, eventSource, Context.PartitionId, Context.ReplicaOrInstanceId);
_eventSource?.ServicePartitionConfigurationChanged(Context.ServiceTypeName, Context.PartitionId, Context.ReplicaOrInstanceId);
}
