return;
        }

        try {
            // Close expired connections
            clientConnectionManager.closeExpired();
            // Close idle connections
            clientConnectionManager.closeIdle(TimeValue.ofMilliseconds(idleConnectionTimeout));
        } catch (final Exception e) {
            logger.warn("A connection monitoring exception occurs.", e);
        }
    }

     * </p>
     *
     * @param closeable the closeable object
     * @see Closeable#close()
     */
    public static void close(final Closeable closeable) {
        if (closeable == null) {
            return;
        }
        try {

      this.closeable = closeable;
      this.thrown = thrown;
      this.suppressed = suppressed;
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      if (obj instanceof Suppression) {
        Suppression other = (Suppression) obj;
        return closeable.equals(other.closeable)
            && thrown.equals(other.thrown)

@J2ktIncompatible
public class ClosingFutureLeakTest extends TestCase {
  public void testLeak() {
    TestCloseable closeable = new TestCloseable("closeable");
    awaitClear(leakClosingFuture(closeable));
    assertThat(closeable.awaitClosed()).isTrue();
  }

  private WeakReference<ClosingFuture<String>> leakClosingFuture(TestCloseable closeable) {
    ClosingFuture<String> willCloseCloseable =
        ClosingFuture.submit(
            closer -> {

@J2ktIncompatible
public class ClosingFutureLeakTest extends TestCase {
  public void testLeak() {
    TestCloseable closeable = new TestCloseable("closeable");
    awaitClear(leakClosingFuture(closeable));
    assertThat(closeable.awaitClosed()).isTrue();
  }

  private WeakReference<ClosingFuture<String>> leakClosingFuture(TestCloseable closeable) {
    ClosingFuture<String> willCloseCloseable =
        ClosingFuture.submit(
            closer -> {

  /**
   * Registers the given {@code closeable} to be closed when this {@code Closer} is {@linkplain
   * #close closed}.
   *
   * @return the given {@code closeable}
   */
  // close. this word no longer has any meaning to me.
  @CanIgnoreReturnValue
  @ParametricNullness
  public <C extends @Nullable Closeable> C register(@ParametricNullness C closeable) {
    if (closeable != null) {
      stack.addFirst(closeable);

      this.closeable = closeable;
      this.thrown = thrown;
      this.suppressed = suppressed;
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      if (obj instanceof Suppression) {
        Suppression other = (Suppression) obj;
        return closeable.equals(other.closeable)
            && thrown.equals(other.thrown)

    ClosingFuture<Closeable> closingFuture =
        ClosingFuture.submit(closer -> closer.eventuallyClose(mockCloseable, executor), executor);
    FluentFuture<Closeable> unused = closingFuture.finishToFuture();
    assertThrows(
        IllegalStateException.class,
        () -> {
          FluentFuture<Closeable> unused2 = closingFuture.finishToFuture();
        });
  }

  }

  public void testFinishToValueAndCloser_throwsAfterCallingFinishToFuture() throws Exception {
    ClosingFuture<Closeable> closingFuture =
        ClosingFuture.submit(closer -> closer.eventuallyClose(mockCloseable, executor), executor);
    FluentFuture<Closeable> unused = closingFuture.finishToFuture();
    assertThrows(
        IllegalStateException.class,
        () ->

import com.google.common.annotations.J2ktIncompatible;
import java.io.Closeable;
import java.io.Flushable;
import java.io.IOException;
import java.io.Writer;
import org.jspecify.annotations.Nullable;

/**
 * Writer that places all output on an {@link Appendable} target. If the target is {@link Flushable}
 * or {@link Closeable}, flush()es and close()s will also be delegated to the target.
 *
 * @author Alan Green