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Apache HttpComponents HTTP/2 and HTTP/1.1 core component integration tests
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package org.apache.hc.core5.testing.classic;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicReference;

import javax.net.ssl.SSLContext;

import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpHost;
import org.apache.hc.core5.http.config.CharCodingConfig;
import org.apache.hc.core5.http.config.H1Config;
import org.apache.hc.core5.http.io.SocketConfig;
import org.apache.hc.core5.http.impl.DefaultConnectionReuseStrategy;
import org.apache.hc.core5.http.impl.HttpProcessors;
import org.apache.hc.core5.http.impl.DefaultAddressResolver;
import org.apache.hc.core5.http.impl.bootstrap.HttpRequester;
import org.apache.hc.core5.http.impl.io.DefaultBHttpClientConnectionFactory;
import org.apache.hc.core5.http.impl.io.HttpRequestExecutor;
import org.apache.hc.core5.http.io.HttpClientConnection;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.http.protocol.HttpProcessor;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.net.URIAuthority;
import org.apache.hc.core5.pool.PoolReusePolicy;
import org.apache.hc.core5.pool.StrictConnPool;
import org.apache.hc.core5.util.TimeValue;

public class ClassicTestClient {

    private final SSLContext sslContext;
    private final SocketConfig socketConfig;

    private final AtomicReference requesterRef;

    public ClassicTestClient(final SSLContext sslContext, final SocketConfig socketConfig) {
        super();
        this.sslContext = sslContext;
        this.socketConfig = socketConfig != null ? socketConfig : SocketConfig.DEFAULT;
        this.requesterRef = new AtomicReference<>(null);
    }

    public ClassicTestClient(final SocketConfig socketConfig) {
        this(null, socketConfig);
    }

    public ClassicTestClient() {
        this(null, null);
    }

    public void start() {
        start(null);
    }

    public void start(final HttpProcessor httpProcessor) {
        if (requesterRef.get() == null) {
            final HttpRequestExecutor requestExecutor = new HttpRequestExecutor(
                    HttpRequestExecutor.DEFAULT_WAIT_FOR_CONTINUE,
                    DefaultConnectionReuseStrategy.INSTANCE,
                    LoggingHttp1StreamListener.INSTANCE);
            final StrictConnPool connPool = new StrictConnPool<>(
                    20,
                    50,
                    TimeValue.NEG_ONE_MILLISECONDS,
                    PoolReusePolicy.LIFO,
                    LoggingConnPoolListener.INSTANCE);
            final HttpRequester requester = new HttpRequester(
                    requestExecutor,
                    httpProcessor != null ? httpProcessor : HttpProcessors.client(),
                    connPool,
                    socketConfig,
                    new DefaultBHttpClientConnectionFactory(H1Config.DEFAULT, CharCodingConfig.DEFAULT),
                    sslContext != null ? sslContext.getSocketFactory() : null,
                    DefaultAddressResolver.INSTANCE);
            requesterRef.compareAndSet(null, requester);
        } else {
            throw new IllegalStateException("Requester has already been started");
        }
    }

    public void shutdown(final CloseMode closeMode) {
        final HttpRequester requester = requesterRef.getAndSet(null);
        if (requester != null) {
            requester.close(closeMode);
        }
    }

    public ClassicHttpResponse execute(
            final HttpHost targetHost,
            final ClassicHttpRequest request,
            final HttpContext context) throws HttpException, IOException {
        final HttpRequester requester = this.requesterRef.get();
        if (requester == null) {
            throw new IllegalStateException("Requester has not been started");
        }
        if (request.getAuthority() == null) {
            request.setAuthority(new URIAuthority(targetHost));
        }
        request.setScheme(targetHost.getSchemeName());
        return requester.execute(targetHost, request, socketConfig.getSoTimeout(), context);
    }

}