serialization

问题 Is anyone able to explain the comment under testLookups() in this code snippet ? I've run the code and indeed what the comment sais is true. However I'd like to understand why it's true, i.e. why is cPickle outputting different values for the same object depending on how it is referenced. Does it have anything to do with reference count? If so, isn't that some kind of a bug - i.e. the pickled and deserialized object would have an abnormally high reference count and in effect would never get

问题 Although it is possible to serialize a lambda in Java 8, it is strongly discouraged; even serializing inner classes is discouraged. The reason given is that lambdas may not deserialize properly on another JRE. However, doesn't this mean that there is a way to safely serialize a lambda? For example, say I define a class to be something like this: public class MyClass { private String value; private Predicate<String> validateValue; public MyClass(String value, Predicate<String> validate) { this

问题 During working on sockets and serializing objects over them, I noticed that there are some 3rd party libraries for faster object serialization on Java such as Kryo and FST. Up to now, I expected that Java's serialization is optimized and the fastest. Because, it is language dependent and gives a low level solution that is expected to be faster. However, the considered libraries claim that they are faster than Java. Can someone explain why Java could not provide the fastest serialization

问题 During working on sockets and serializing objects over them, I noticed that there are some 3rd party libraries for faster object serialization on Java such as Kryo and FST. Up to now, I expected that Java's serialization is optimized and the fastest. Because, it is language dependent and gives a low level solution that is expected to be faster. However, the considered libraries claim that they are faster than Java. Can someone explain why Java could not provide the fastest serialization

问题 During working on sockets and serializing objects over them, I noticed that there are some 3rd party libraries for faster object serialization on Java such as Kryo and FST. Up to now, I expected that Java's serialization is optimized and the fastest. Because, it is language dependent and gives a low level solution that is expected to be faster. However, the considered libraries claim that they are faster than Java. Can someone explain why Java could not provide the fastest serialization

问题 Fundamentally, I want to include or omit a property from the generated Json based on its value at the time of serialization. More-specifically, I have a type that knows if a value has been assigned to it and I only want to serialize properties of that type if there has been something assigned to it (so I need to inspect the value at runtime). I'm trying to make it easy for my API to detect the difference between "has the default value" and "wasn't specified at all". A custom JsonConverter

问题 Fundamentally, I want to include or omit a property from the generated Json based on its value at the time of serialization. More-specifically, I have a type that knows if a value has been assigned to it and I only want to serialize properties of that type if there has been something assigned to it (so I need to inspect the value at runtime). I'm trying to make it easy for my API to detect the difference between "has the default value" and "wasn't specified at all". A custom JsonConverter

问题 Fundamentally, I want to include or omit a property from the generated Json based on its value at the time of serialization. More-specifically, I have a type that knows if a value has been assigned to it and I only want to serialize properties of that type if there has been something assigned to it (so I need to inspect the value at runtime). I'm trying to make it easy for my API to detect the difference between "has the default value" and "wasn't specified at all". A custom JsonConverter

问题 I need to add @JsonIgnore annotated fields while serializing an object by Jackson ObjectMapper . I know you may offer me to remove the @JsonIgnore annotation from my class, but I need they are ignorable in some part of my application. And in another part of my application I need to have those @JsonIgnore annotated fields in my json string. 回答1: You can define a SimpleBeanPropertyFilter and FilterProvider. First annotate your class with custom filter like this: @JsonFilter("firstFilter")

问题 The field is used only during the serialization / deserialization process but I would like to immediately encapsulate it and hide from the class. Is it possible? 回答1: Basically, no. XmlSerializer only works with public members, so you can't make it internal or private . You can add some attributes to make it less glaring especially in UIs that data-bind: [Browsable(false)] [EditorBrowsable(EditorBrowsableState.Never)] public int Foo {get; set; } but that only masks it. You could also look at