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com.ebiznext.comet.utils.CometJacksonModule

JacksonProtectedSingleton

trait JacksonProtectedSingleton extends AnyRef

A trait to identify case objects are requiring special protection from Jackson's deserializer

Jackson doesn't know a class is actually an object type, and will happily make new instances of things supposed to be objects (singletons). These 'clone' instances are toxic as they will **not** patmat correctly, as Scala simply compares identityHashcodes in patterns involving a case object.

To avoid this, we define this trait, which registers the canonical instance within a special table, and provide a helpful exception

One should also define a Builder inheriting from com.ebiznext.comet.utils.CometJacksonModule.ProtectedSingletonBuilder, and decorate the case object with @JsonDeserialize(builder = classOf[MyObjectBuilder]).

The goal of that builder is to "lie" to Jackson by 'building' an instance, which is actually *the* instance

See also

https://github.com/FasterXML/jackson-module-scala/issues/211

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