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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.nio;

import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicReference;

import org.apache.hc.core5.function.Callback;
import org.apache.hc.core5.http.nio.command.ShutdownCommand;
import org.apache.hc.core5.io.CloseMode;
import org.apache.hc.core5.reactor.ExceptionEvent;
import org.apache.hc.core5.reactor.IOEventHandlerFactory;
import org.apache.hc.core5.reactor.IOReactorConfig;
import org.apache.hc.core5.reactor.IOReactorService;
import org.apache.hc.core5.reactor.IOReactorStatus;
import org.apache.hc.core5.reactor.IOSession;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.Asserts;
import org.apache.hc.core5.util.TimeValue;

abstract class IOReactorExecutor implements AutoCloseable {

    enum Status { READY, RUNNING, TERMINATED }

    private final IOReactorConfig ioReactorConfig;
    private final ThreadFactory workerThreadFactory;
    private final AtomicReference ioReactorRef;
    private final AtomicReference status;

    IOReactorExecutor(final IOReactorConfig ioReactorConfig, final ThreadFactory workerThreadFactory) {
        super();
        this.ioReactorConfig = ioReactorConfig != null ? ioReactorConfig : IOReactorConfig.DEFAULT;
        this.workerThreadFactory = workerThreadFactory;
        this.ioReactorRef = new AtomicReference<>(null);
        this.status = new AtomicReference<>(Status.READY);
    }

    abstract T createIOReactor(
            IOEventHandlerFactory ioEventHandlerFactory,
            IOReactorConfig ioReactorConfig,
            ThreadFactory threadFactory,
            Callback sessionShutdownCallback) throws IOException;

    protected void execute(final IOEventHandlerFactory ioEventHandlerFactory) throws IOException {
        Args.notNull(ioEventHandlerFactory, "Handler factory");
        if (ioReactorRef.compareAndSet(null, createIOReactor(
                ioEventHandlerFactory,
                ioReactorConfig,
                workerThreadFactory,
                ShutdownCommand.GRACEFUL_NORMAL_CALLBACK))) {
            if (status.compareAndSet(Status.READY, Status.RUNNING)) {
                ioReactorRef.get().start();
            }
        } else {
            throw new IllegalStateException("I/O reactor has already been started");
        }
    }

    private T ensureRunning() {
        final T ioReactor = ioReactorRef.get();
        Asserts.check(ioReactor != null, "I/O reactor has not been started");
        return ioReactor;
    }

    T reactor() {
        return ensureRunning();
    }

    public IOReactorStatus getStatus() {
        final T ioReactor = ioReactorRef.get();
        return ioReactor != null ? ioReactor.getStatus() : IOReactorStatus.INACTIVE;
    }

    public List getExceptionLog() {
        final T ioReactor = ioReactorRef.get();
        return ioReactor != null ? ioReactor.getExceptionLog() : Collections.emptyList();
    }

    public void awaitShutdown(final TimeValue waitTime) throws InterruptedException {
        Args.notNull(waitTime, "Wait time");
        final T ioReactor = ioReactorRef.get();
        if (ioReactor != null) {
            ioReactor.awaitShutdown(waitTime);
        }
    }

    public void initiateShutdown() {
        final T ioReactor = ioReactorRef.get();
        if (ioReactor != null) {
            if (status.compareAndSet(Status.RUNNING, Status.TERMINATED)) {
                ioReactor.initiateShutdown();
            }
        }
    }

    public void shutdown(final TimeValue graceTime) {
        Args.notNull(graceTime, "Grace time");
        final T ioReactor = ioReactorRef.get();
        if (ioReactor != null) {
            if (status.compareAndSet(Status.RUNNING, Status.TERMINATED)) {
                ioReactor.initiateShutdown();
            }
            try {
                ioReactor.awaitShutdown(graceTime);
            } catch (final InterruptedException ex) {
                Thread.currentThread().interrupt();
            }
            ioReactor.close(CloseMode.IMMEDIATE);
        }
    }

    @Override
    public void close() throws Exception {
        shutdown(TimeValue.ofSeconds(5));
    }

}