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package com.fluxtion.runtime.util;

import com.fluxtion.runtime.partition.LambdaReflection.SerializableSupplier;

import java.util.ArrayList;
import java.util.List;

public class ObjectPool {

    private final SerializableSupplier supplier;
    private transient final List freeList = new ArrayList<>();

    public ObjectPool(SerializableSupplier supplier) {
        this.supplier = supplier;
    }

    public T checkOut() {
        if (freeList.isEmpty()) {
            return supplier.get();
        }
        return freeList.remove(freeList.size() - 1);
    }

    public void checkIn(T returnedInstance) {
        freeList.add(returnedInstance);
    }

    public void reset() {
        freeList.clear();
    }
}