package com.heedi.spring;

import com.heedi.spring.model.Cat;

import com.heedi.spring.model.Character;

import org.junit.jupiter.api.Test;

import java.util.HashMap;

import java.util.Hashtable;

import java.util.concurrent.ConcurrentHashMap;

import static org.assertj.core.api.Assertions.assertThatNullPointerException;

import static org.junit.jupiter.api.Assertions.assertEquals;

import static org.junit.jupiter.api.Assertions.assertNull;

public class HashTest {

private static final Character KIND = Character

.builder()

.tendency("kind")

.build();

private static final Cat MOMO = Cat.builder()

.name("momo")

.age(5)

.character(KIND)

.build();

private static final Cat DD = Cat.builder()

.name("dd")

.age(6)

.character(KIND)

.build();

private Hashtable<Character, Cat> table = new Hashtable<>();

private HashMap<Cat, Integer> map = new HashMap<>();

private ConcurrentHashMap<Cat, String> concurrentHashMap = new ConcurrentHashMap<>();

@Test

void hashtable_synchronized() {

// method 자체에 synchronized 처리

// this에 Lock이 걸림 (성능 저하)

table.put(KIND, MOMO);

table.get(KIND);

}

@Test

void hashtable_null_value() {

assertThatNullPointerException()

.isThrownBy(() -> table.put(KIND, null));

}

@Test

void hashtable_null_key() {

assertThatNullPointerException()

.isThrownBy(() -> table.put(null, DD));

}

@Test

void map_synchronized() {

// no synchronized

map.put(MOMO, 3);

// no synchronized

map.get(KIND);

}

@Test

void hashMap_null_value() {

map.put(DD, null);

assertNull(map.get(DD));

}

@Test

void hashMap_null_key() {

map.put(null, 0);

assertEquals(0, (int) map.get(null));

}

@Test

void concurrentHashMap_s() {

// Node에 synchronized 처리

// MultiThread에 유리

concurrentHashMap.put(MOMO, "MOMO");

// no synchronized

concurrentHashMap.get(MOMO);

}

@Test

void concurrentHashMap_null_value() {

assertThatNullPointerException()

.isThrownBy(() -> concurrentHashMap.put(MOMO, null));

}

@Test

void concurrentHashMap_null_key() {

assertThatNullPointerException()

.isThrownBy(() -> concurrentHashMap.put(null, "DD"));

}

}