TestClientRequestReExecution.java

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 * to you under the Apache License, Version 2.0 (the
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package org.apache.hc.client5.testing.sync;

import static org.hamcrest.MatcherAssert.assertThat;

import java.util.concurrent.atomic.AtomicInteger;
import org.apache.hc.client5.http.impl.DefaultHttpRequestRetryStrategy;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.client5.testing.classic.RandomHandler;
import org.apache.hc.client5.testing.classic.ServiceUnavailableDecorator;
import org.apache.hc.client5.testing.extension.sync.ClientProtocolLevel;
import org.apache.hc.client5.testing.extension.sync.TestClient;
import org.apache.hc.core5.function.Resolver;
import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.URIScheme;
import org.apache.hc.core5.http.io.entity.EntityUtils;
import org.apache.hc.core5.http.io.support.ClassicRequestBuilder;
import org.apache.hc.core5.util.TimeValue;
import org.hamcrest.CoreMatchers;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

abstract class TestClientRequestReExecution extends AbstractIntegrationTestBase {

    public TestClientRequestReExecution(final URIScheme scheme) {
        super(scheme, ClientProtocolLevel.STANDARD);
    }

    @BeforeEach
    void setup() {
        final Resolver<HttpRequest, TimeValue> serviceAvailabilityResolver = new Resolver<HttpRequest, TimeValue>() {

            private final AtomicInteger count = new AtomicInteger(0);

            @Override
            public TimeValue resolve(final HttpRequest request) {
                final int n = count.incrementAndGet();
                return n <= 3 ? TimeValue.ofSeconds(1) : null;
            }

        };

        configureServer(bootstrap -> bootstrap.setExchangeHandlerDecorator(handler
                -> new ServiceUnavailableDecorator(handler, serviceAvailabilityResolver)));
    }

    @Test
    void testGiveUpAfterOneRetry() throws Exception {
        configureServer(bootstrap -> bootstrap.register("/random/*", new RandomHandler()));
        final HttpHost target = startServer();

        configureClient(builder -> builder
                .setRetryStrategy(new DefaultHttpRequestRetryStrategy(1, TimeValue.ofSeconds(1))));
        final TestClient client = client();

        final HttpClientContext context = HttpClientContext.create();
        final ClassicHttpRequest request = ClassicRequestBuilder.get()
                .setHttpHost(target)
                .setPath("/random/2048")
                .build();
        final HttpResponse response = client.execute(target, request, context, r -> {
            EntityUtils.consume(r.getEntity());
            return r;
        });
        assertThat(response.getCode(), CoreMatchers.equalTo(HttpStatus.SC_SERVICE_UNAVAILABLE));
    }

    @Test
    void testDoNotGiveUpEasily() throws Exception {
        configureServer(bootstrap -> bootstrap.register("/random/*", new RandomHandler()));
        final HttpHost target = startServer();

        configureClient(builder -> builder
                .setRetryStrategy(new DefaultHttpRequestRetryStrategy(5, TimeValue.ofSeconds(1))));
        final TestClient client = client();

        final HttpClientContext context = HttpClientContext.create();
        final ClassicHttpRequest request = ClassicRequestBuilder.get()
                .setHttpHost(target)
                .setPath("/random/2048")
                .build();
        final HttpResponse response = client.execute(target, request, context, r -> {
            EntityUtils.consume(r.getEntity());
            return r;
        });
        assertThat(response.getCode(), CoreMatchers.equalTo(HttpStatus.SC_OK));
    }

}