Memory objects for Kotlin/JVM and Java

Last update: Jul 29, 2022

Related tags

O/R Mapping kotlin java oop kotlin-library java-library oop-principles oop-library elegantobjects elegant-objects

Overview

Memoria

Why should an object care about where to store their bytes?

Examples

Basics

RAM can used as a memory storage:

val ram: BytesMemory = RamMemory()

Also a file could:

val cache: BytesMemory = FileMemory(File("//path"))

Restrictions

If you do not want your object to suddenly take to much space:

BoundedBytesMemory(
    min = 0, // might be omitted (0 by default)
    max = 128,
    RamMemory()
)

Thus, once the limit is overflown you'll see IllegalArgumentExcepton

Useful

Primitives

There is a number of adapters to kotlin 'primitives'. These use BytesMemory to store the value, but acts as memory of their type:

StringMemory implements MutableMemory<String>, so you can write("Hello, World") instread of working with bytes.
IntMemory.

TwinMemory

TwinMemory class allows you to have two different (or the same... why not) memory sources:

val twin = StringMemory(
    TwinMemory(
        RamMemory(),
        FileMemory(
            File("twin.txt")
        )
    )
)

twin.write("twin me!") // -> will write the value to both sources, ram and file
twin.value() // -> returns value stored in ram, the first (origin) argument of the constructor

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