fix(jsii-pacmak): improve struct performance in Java #4140
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When a struct is returned to Java, it gets returned by reference. The Java struct proxy then proceeds to read all fields from the struct, even if they are never used by the Java program. Make this behavior on-demand with a cache: the value is read if it is requested, but will never be read more than once (this is fine as structs are immutable). If we decide to pass the struct back into jsii, we can avoid having to read all the fields at that point to build a fresh struct if we hold on to the struct reference and pass that back in.
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When a struct is returned to Java, it gets returned by reference. The Java struct proxy then proceeds to read all fields from the struct, even if they are never used by the Java program.
Make this behavior on-demand with a cache: the value is read if it is requested, but will never be read more than once (this is fine as structs are immutable).
If we decide to pass the struct back into jsii, we can avoid having to read all the fields at that point to build a fresh struct if we hold on to the struct reference and pass that back in.
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