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subscription in graphql

Pragya Keshap answered on February 21, 2023 Popularity 10/10 Helpfulness 1/10

answer subscription in graphql

subscription in graphql

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Subscriptions are a GraphQL feature that allows a server to send data to its clients when a specific event happens. Subscriptions are usually implemented with WebSockets. In that setup, the server maintains a steady connection to its subscribed client.

@SubscriptionMapping("notifyProductPriceChange")
public Flux<ProductPriceHistory> notifyProductPriceChange(@Argument Long productId) {

    // A flux is the publisher of data
    return Flux.fromStream(
            Stream.generate(() -> {

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }

                var productPriceHistory = new ProductPriceHistory(productId, new Date(), rn.nextInt(10) + 1);
                return productPriceHistory;
            }));

}

https://www.linkedin.com/pulse/spring-graphql-part-2-subscriptions-mike-lythgoe/

Popularity 10/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: graphql java subscription

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