/// <summary>
/// A generic method to serialize primitive Avro types.
/// </summary>
/// <typeparam name="S">Type of the C# type to be serialized</typeparam>
/// <param name="value">The value to be serialized</param>
/// <param name="tag">The schema type tag</param>
/// <param name="writer">The writer which should be used to write the given type.</param>
protected virtual void Write <S>(object value, Schema.Type tag, Writer <S> writer)
{
if (!(value is S))
{
throw TypeMismatch(value, tag.ToString(), typeof(S).ToString());
}
writer((S)value);
}
/// <summary>
/// A generic method to serialize primitive Avro types.
/// </summary>
/// <typeparam name="S">Type of the C# type to be serialized</typeparam>
/// <param name="value">The value to be serialized</param>
/// <param name="tag">The schema type tag</param>
/// <param name="writer">The writer which should be used to write the given type.</param>
protected void Write <S>(object value, Schema.Type tag, Writer <S> writer)
{
if (value == null)
{
value = default(S);
}
if (!(value is S))
{
throw TypeMismatch(value, tag.ToString(), typeof(S).ToString());
}
writer((S)value);
}
/// <summary>
/// Gets the type of the specified type name
/// </summary>
/// <param name="name">name of the object to get type of</param>
/// <param name="schemaType">schema type for the object</param>
/// <returns>Type</returns>
public Type GetType(string name, Schema.Type schemaType)
{
Type type = FindType(name, true);
if (schemaType == Schema.Type.Map)
{
type = GenericMapType.MakeGenericType(new[] { typeof(string), type });
}
else if (schemaType == Schema.Type.Array)
{
type = GenericListType.MakeGenericType(new [] { type });
}
return(type);
}
/// <summary>
/// A generic method to serialize primitive Avro types.
/// </summary>
/// <typeparam name="S">Type of the C# type to be serialized</typeparam>
/// <param name="value">The value to be serialized</param>
/// <param name="tag">The schema type tag</param>
/// <param name="writer">The writer which should be used to write the given type.</param>
private static void Write <S>(object value, Schema.Type tag, Writer <S> writer)
{
if (value == null)
{
value = default(S);
}
if (!(value is S))
{
throw new AvroTypeMismatchException(
$"[{typeof(S)}] required to write against [{tag.ToString()}] schema but found " + value.GetType());
}
writer((S)value);
}
protected override bool IsReusable(Schema.Type tag)
{
switch (tag)
{
case Schema.Type.Double:
case Schema.Type.Boolean:
case Schema.Type.Int:
case Schema.Type.Long:
case Schema.Type.Float:
case Schema.Type.Bytes:
case Schema.Type.String:
case Schema.Type.Null:
return(false);
}
return(true);
}
/// <summary>
/// Creates new instance of the given type
/// </summary>
/// <param name="name">fully qualified name of the type</param>
/// <param name="schemaType">type of schema</param>
/// <returns>new object of the given type</returns>
public object New(string name, Schema.Type schemaType)
{
NameCtorKey key = new NameCtorKey(name, schemaType);
CtorDelegate ctor;
lock (ctors)
{
if (!ctors.TryGetValue(key, out ctor))
{
Type type = GetType(name, schemaType);
ctor = GetConstructor(name, schemaType, type);
ctors.Add(key, ctor);
}
}
return(ctor());
}
/// <summary>
/// Gets the default constructor for the specified type
/// </summary>
/// <param name="name">name of object for the type</param>
/// <param name="schemaType">schema type for the object</param>
/// <param name="type">type of the object</param>
/// <returns>Default constructor for the type</returns>
public CtorDelegate GetConstructor(string name, Schema.Type schemaType, Type type)
{
//ConstructorInfo ctorInfo = type.GetConstructor(Type.EmptyTypes);
//if (ctorInfo == null)
// throw new AvroException("Class " + name + " has no default constructor");
//DynamicMethod dynMethod = new DynamicMethod("DM$OBJ_FACTORY_" + name, typeof(object), null, type, true);
//ILGenerator ilGen = dynMethod.GetILGenerator();
//ilGen.Emit(OpCodes.Nop);
//ilGen.Emit(OpCodes.Newobj, ctorInfo);
//ilGen.Emit(OpCodes.Ret);
//return (CtorDelegate)dynMethod.CreateDelegate(ctorType);
// https://ayende.com/blog/3167/creating-objects-perf-implications
// http://bit.ly/2cbySMk
//return () => Activator.CreateInstance(type);
return(GetCreator(type));
}
private static ObjectCreator.CtorDelegate GetConstructor(string name, Schema.Type schemaType)
{
var creator = ObjectCreator.Instance;
return(creator.GetConstructor(name, schemaType, creator.GetType(name, schemaType)));
}
protected S Read <S>(Schema.Type tag, Schema readerSchema, Reader <S> reader)
{
return(reader());
}
public NameCtorKey(string value1, Schema.Type value2)
: this()
{
name = value1;
type = value2;
}
/// <summary>
/// Indicates if it's possible to reuse an object of the specified type. Generally
/// false for immutable objects like int, long, string, etc but may differ between
/// the Specific and Generic implementations. Used to avoid retrieving the existing
/// value if it's not reusable.
/// </summary>
protected virtual bool IsReusable(Schema.Type tag)
{
return(true);
}