httpclient5-testing/src/test/java/org/apache/hc/client5/testing/async/TestHttp1RequestReExecution.java

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 * distributed with this work for additional information
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 * to you 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
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package org.apache.hc.client5.testing.async;

import static org.hamcrest.MatcherAssert.assertThat;

import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;

import org.apache.hc.client5.http.async.methods.SimpleHttpResponse;
import org.apache.hc.client5.http.async.methods.SimpleRequestBuilder;
import org.apache.hc.client5.http.impl.DefaultHttpRequestRetryStrategy;
import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
import org.apache.hc.core5.function.Resolver;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.HttpRequest;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.URIScheme;
import org.apache.hc.core5.http.config.Http1Config;
import org.apache.hc.core5.testing.nio.H2TestServer;
import org.apache.hc.core5.util.TimeValue;
import org.hamcrest.CoreMatchers;
import org.junit.jupiter.api.Test;

public abstract class TestHttp1RequestReExecution extends AbstractIntegrationTestBase {

    public TestHttp1RequestReExecution(final URIScheme scheme) {
        super(scheme);
    }

    protected H2TestServer startServer() throws Exception {
        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;
            }

        };

        return startServer(Http1Config.DEFAULT, null, handler ->
                new ServiceUnavailableAsyncDecorator(handler, serviceAvailabilityResolver));
    }

    @Test
    public void testGiveUpAfterOneRetry() throws Exception {
        final H2TestServer server = startServer();
        server.register("/random/*", AsyncRandomHandler::new);
        final HttpHost target = targetHost();

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

        final Future<SimpleHttpResponse> future = client.execute(
                SimpleRequestBuilder.get()
                        .setHttpHost(target)
                        .setPath("/random/2048")
                        .build(), null);
        final SimpleHttpResponse response = future.get();
        assertThat(response, CoreMatchers.notNullValue());
        assertThat(response.getCode(), CoreMatchers.equalTo(HttpStatus.SC_SERVICE_UNAVAILABLE));
    }

    @Test
    public void testDoNotGiveUpEasily() throws Exception {
        final H2TestServer server = startServer();
        server.register("/random/*", AsyncRandomHandler::new);
        final HttpHost target = targetHost();

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

        final Future<SimpleHttpResponse> future = client.execute(
                SimpleRequestBuilder.get()
                        .setHttpHost(target)
                        .setPath("/random/2048")
                        .build(), null);
        final SimpleHttpResponse response = future.get();
        assertThat(response, CoreMatchers.notNullValue());
        assertThat(response.getCode(), CoreMatchers.equalTo(HttpStatus.SC_OK));
    }

}