Apparatuses, methods and systems for persisting values in a computing environment
The present disclosure is directed to persisting values in a computing environment, particularly using computer programs that are configured to run on a virtual machine. An illustrative method includes first launching a computer program, preferably within the environment of a virtual machine. The method further includes loading a plurality of classes associated with the computer program into memory by way of a specially configured class loader. This class loader is configured to scan at least one class of classes loaded into memory for at least one persistence-annotated field within that class. The specially configured class loader is further configured to write byte code into a class that contains the at least one persistence-annotated field. The byte code that is added to the class is configured to cause a first object that is later instantiated from the at least one class to have the persistence-annotated field.
1. A method for persisting values in a computing environment, comprising:
launching a computer program;
loading a plurality of classes associated with the computer program into memory via processor by way of a class loader that is configured to:
scan at least one class of said plurality of classes loaded into memory via processor for at least one persistence-annotated field within said at least one class, said at least one persistence-annotated field having a persistence annotation indicating that a data value associated with the annotated field is to be persisted;
write byte code into said at least one class containing said at least one persistence-annotated field via processor, said byte code causing a first object instantiated from said at least one class to have said at least one persistence-annotated field therein; and
instantiating said first object including said at least one persistence-annotated field.
2. The method of claim 1 , further comprising:
observing a change in a value of said at least one persistence-annotated field in said first object; and
notifying a persistence manager object of the change of the value of said at least one persistence-annotated field in said first object; and
storing an updated value of the persistence-annotated field in a data store associated with the persistence manager object.
3. The method of claim 2 , wherein the persistence manager object is instantiated the first time that the value of said at least one persistence-annotated field changes.
4. The method of claim 2 , wherein the first object calls a function in the persistence manager object to update the value of the persistence-annotated field in the data store.
5. The method of claim 4 , wherein the persistence manager object uses the persistence annotation as a key in a key value pair storing the updated value of the persistence-annotated field in the data store, and further wherein the updated value of the persistence-annotated field is used as the value in the key value pair.
6. The method of claim 2 , wherein the data store is a map.
7. The method of claim 6 , further comprising writing out the value of the persistence-annotated field stored in the map.
8. The method of claim 7 , wherein the value is written to a database.
9. The method of claim 1 , wherein the computer program is a Java Virtual Machine compliant computer program being executed from within a first running Java Virtual Machine instance.
10. The method of claim 1 , wherein the computer program is a Visual C#® computer program or a Python® computer program being executed from within a virtual machine in memory.
11. The method of claim 1 , wherein the computer program is a Kotlin® computer program, Groovy™ computer program, or a Clojure™ computer program being executed from within a virtual machine in memory.
12. An apparatus comprising a plurality of circuit modules, computer memory, and at least one processor configured and arranged to persist values in a computing environment, the circuit modules including:
a first circuit module configured and arranged to launch a computer program;
a second circuit module configured and arranged to load a plurality of classes associated with the computer program into memory by way of a class loader for modifying the code within at least one class of said plurality of classes having a persistence annotated field by:
scanning said at least one class of said plurality of classes loaded into memory for at least one persistence-annotated field within said at least one class, said at least one persistence-annotated field having a persistence annotation indicating that a data value associated with the annotated field is to be persisted;
writing byte code into said at least one class containing said at least one persistence-annotated field, said byte code causing a first object instantiated from said at least one class to have said at least one persistence-annotated field therein; and
a third circuit module configured and arranged to instantiate said first object including said at least one persistence-annotated field.
13. The apparatus of claim 12 , wherein the first object is configured to notify a persistence manager object of a change of the value of said at least one persistence-annotated field in said first object.
14. The apparatus of claim 13 , wherein said persistence manager object stores an updated value of said at least one persistence-annotated field in a data store associated with said persistence manager object.
15. The apparatus of claim 14 , wherein said persistence manager object is instantiated in response to the first object calling a function to notify the persistence manager.
16. The apparatus of claim 15 , wherein the persistence manager object is configured to use the persistence annotation as a key in a key value pair storing the updated value of the persistence-annotated field in the data store, and further wherein the updated value of the persistence-annotated field is used as the value in the key value pair.
17. The apparatus of claim 14 , wherein the data store is a map.
18. A processor-readable tangible non-transient medium storing a computer program for operating a system for persisting values in a computing environment, wherein the computer program comprises:
instructions for launching a computer application;
instructions for loading a plurality of classes associated with the computer application into memory by way of a class loader, said class loader being configured to:
scan at least one class of said plurality of classes loaded into memory for at least one persistence-annotated field within said at least one class, said at least one persistence-annotated field having a persistence annotation indicating that a data value associated with the annotated field is to be persisted;
write byte code into said at least one class containing said at least one persistence-annotated field, said byte code causing a first object instantiated from said at least one class to have said at least one persistence-annotated field therein; and
instructions for instantiating said first object including said at least one persistence-annotated field.
19. The processor-readable tangible non-transient medium of claim 18 , wherein the first object is instructed to notify a persistence manager object of a change of the value of said at least one persistence-annotated field in said first object.
20. The processor-readable tangible non-transient medium of claim 19 , wherein said persistence manager object is instructed to store an updated value of said at least one persistence-annotated field in a data store associated with said persistence manager object.
21. The processor-readable tangible non-transient medium of claim 20 , wherein said persistence manager object is instructed to be instantiated in response to the first object calling a function to notify the persistence manager object.
22. The processor-readable tangible non-transient medium of claim 21 , wherein the persistence manager object is instructed to use the persistence annotation as a key in a key value pair storing the updated value of the persistence-annotated field in the data store, and further wherein the updated value of the persistence-annotated field is used as the value in the key value pair.
23. The processor-readable tangible non-transient medium of claim 20 , wherein the data store is a map.