Memory Layout

Memory Layouts can be used in order to streamline the allocation of off-heap memory. Here is an overview of how MemoryLayout differs from MemorySegment.

Assume an array of structs needs to be declared for the following example. First an Arena must be created, any arena type desired will do. Next a MemoryLayout.sequenceLayout() can be used, with arguments n, that reflect the length of the array, and MemoryLayout.structLayout(), that takes in the value layouts and names of elements within the struct. After this, create VarHandles for each element within the struct, which create a reference for each respective element. Then create a MemorySegment that corresponds to the entire memory layout of the array, and allocate it to the appropriate arena, and finally the structs can be accessed.

For additional information on MemoryLayout, visit Oracle's official documentation.