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stream api parallel하게 연산 #56

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suyeonkwong opened this issue Jun 23, 2023 · 0 comments
Open

stream api parallel하게 연산 #56

suyeonkwong opened this issue Jun 23, 2023 · 0 comments

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@suyeonkwong
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private long getOrderedItemsOriginAmount(List<OrderDetail> orderDetails) {
        return orderDetails.stream().map(orderDetail -> orderDetail.getItem().getPrice()).parallel().reduce(0L, Long::sum);
}

주문 상품의 원가를 리턴받는 메서드에서 주문 상세 스트림의 reduce 작업을 병렬 스트림으로 사용했는데 합계를 구하는 작업은 순차처리가 중요하지 않기 때문이다.
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@suyeonkwong