/**
 * A set comprising zero or more {@linkplain Range#isEmpty nonempty}, {@linkplain
 * Range#isConnected(Range) disconnected} ranges of type {@code C}.
 *
 * <p>Implementations that choose to support the {@link #add(Range)} operation are required to
 * ignore empty ranges and coalesce connected ranges. For example:
 *
 * {@snippet :
 * RangeSet<Integer> rangeSet = TreeRangeSet.create();

    List<Range<C>> asRanges = ImmutableList.copyOf(rangeSet.asRanges());

    // test that connected ranges are coalesced
    for (int i = 0; i + 1 < asRanges.size(); i++) {
      Range<C> range1 = asRanges.get(i);
      Range<C> range2 = asRanges.get(i + 1);
      assertFalse(range1.isConnected(range2));
    }

    // test that there are no empty ranges
    for (Range<C> range : asRanges) {

  }

  override fun callConnectEnd(
    route: Route,
    protocol: Protocol?,
  ) {
    eventListener.connectEnd(call, route.socketAddress, route.proxy, protocol)
  }

  override fun connectionConnectEnd(
    connection: Connection,
    route: Route,
  ) {
    poolConnectionListener.connectEnd(connection, route, call)
  }

  override fun connectionAcquired(connection: Connection) {

11:55:40 V/InstrumentationResultParser: OK (12 tests)
...
11:55:40 I/XmlResultReporter: XML test result file generated at /Users/myusername/workspace/okhttp/regression-test/build/outputs/regression-results/connected/TEST-pixel3a-Q(AVD) - 10-android-test-.xml. Total tests 13, passed 11, assumption_failure 1, ignored 1,
...
BUILD SUCCESSFUL in 1m 30s
63 actionable tasks: 61 executed, 2 up-to-date

```

  Set<N> predecessors();

  Set<N> successors();

  /**
   * Returns an iterator over the incident edges.
   *
   * @param thisNode The node that this all of the connections in this class are connected to.
   */
  Iterator<EndpointPair<N>> incidentEdgeIterator(N thisNode);

  /**
   * Returns the value associated with the edge connecting the origin node to {@code node}, or null
   * if there is no such edge.
   */

          + "so it cannot be reused to connect the following nodes: %s.";
  static final String MULTIPLE_EDGES_CONNECTING =
      "Cannot call edgeConnecting() when parallel edges exist between %s and %s. Consider calling "
          + "edgesConnecting() instead.";
  static final String PARALLEL_EDGES_NOT_ALLOWED =
      "Nodes %s and %s are already connected by a different edge. To construct a graph "

11:55:40 V/InstrumentationResultParser: OK (12 tests)
...
11:55:40 I/XmlResultReporter: XML test result file generated at /Users/myusername/workspace/okhttp/android-test/build/outputs/androidTest-results/connected/TEST-pixel3a-Q(AVD) - 10-android-test-.xml. Total tests 13, passed 11, assumption_failure 1, ignored 1,
...
BUILD SUCCESSFUL in 1m 30s
63 actionable tasks: 61 executed, 2 up-to-date

```

  /** Records a failure connecting to [failedRoute]. */
  @Synchronized fun failed(failedRoute: Route) {
    _failedRoutes.add(failedRoute)
  }

  /** Records success connecting to [route]. */
  @Synchronized fun connected(route: Route) {
    _failedRoutes.remove(route)
  }

  /** Returns true if [route] has failed recently and should be avoided. */
  @Synchronized fun shouldPostpone(route: Route): Boolean = route in _failedRoutes

  private var writerTask: Task? = null

  /** Null until this web socket is connected. Only accessed by the reader thread. */
  private var reader: WebSocketReader? = null

  // All mutable web socket state is guarded by this.

  /** Null until this web socket is connected. Note that messages may be enqueued before that. */
  private var writer: WebSocketWriter? = null

 *     possible for shared exchanges to make requests to different host names! See
 *     [RealConnection.isEligible] for details.
 *
 *  3. Attempt plans from prior connect attempts for this call. These occur as either follow-ups to
 *     failed connect attempts (such as trying the next [ConnectionSpec]), or as attempts that lost
 *     a race in fast follow-up.
 *