/
TimeoutClient.java
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/
TimeoutClient.java
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/*
* Copyright © 2021 Apple Inc. and the ServiceTalk project authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.servicetalk.examples.http.timeout;
import io.servicetalk.concurrent.api.Single;
import io.servicetalk.http.api.HttpClient;
import io.servicetalk.http.api.HttpResponse;
import io.servicetalk.http.netty.HttpClients;
import io.servicetalk.http.utils.TimeoutHttpRequesterFilter;
import java.time.Duration;
import static io.servicetalk.concurrent.api.Single.collectUnorderedDelayError;
import static io.servicetalk.http.api.HttpSerializers.textSerializerUtf8;
import static java.time.Duration.ofSeconds;
/**
* Extends the async 'Hello World!' example to demonstrate use of timeout filters and timeout operators. If a single
* timeout can be applied to all transactions then the timeout should be applied using the
* {@link TimeoutHttpRequesterFilter}. If only some transactions require a timeout then the timeout should be applied
* using a {@link io.servicetalk.concurrent.api.Single#timeout(Duration)} Single.timeout()} or a
* {@link io.servicetalk.concurrent.api.Publisher#timeoutTerminal(Duration)} (Duration)} Publisher.timeoutTerminal()}
* operator.
*/
public final class TimeoutClient {
public static void main(String[] args) throws Exception {
try (HttpClient client = HttpClients.forSingleAddress("localhost", 8080)
// Filter enforces that requests made with this client must fully complete
// within 10 seconds or will be cancelled.
.appendClientFilter(new TimeoutHttpRequesterFilter(ofSeconds(10), true))
.build()) {
// first request, with default timeout from HttpClient (this will succeed)
Single<HttpResponse> respSingle1 = client.request(client.get("/defaultTimeout"))
.whenOnError(System.err::println)
.whenOnSuccess(resp -> {
System.out.println(resp.toString((name, value) -> value));
System.out.println(resp.payloadBody(textSerializerUtf8()));
});
// second request, with custom timeout that is lower than the client default (this will timeout)
Single<HttpResponse> respSingle2 = client.request(client.get("/3secondTimeout"))
// This request and response must complete within 3 seconds or the request will be cancelled.
.timeout(ofSeconds(3))
.whenOnError(System.err::println)
.whenOnSuccess(resp -> {
System.out.println(resp.toString((name, value) -> value));
System.out.println(resp.payloadBody(textSerializerUtf8()));
});
// Issue the requests in parallel.
collectUnorderedDelayError(respSingle1, respSingle2)
// This example is demonstrating asynchronous execution, but needs to prevent the main thread from exiting
// before the response has been processed. This isn't typical usage for an asynchronous API but is useful
// for demonstration purposes.
.toFuture().get();
}
}
}