// Make sure this connection is healthy & eligible for new exchanges. If it's no longer needed
    // then we're on the hook to close it.
    val healthy = candidate.isHealthy(doExtensiveHealthChecks)
    var noNewExchangesEvent = false
    val toClose: Socket? =
      candidate.withLock {
        when {
          !healthy -> {
            noNewExchangesEvent = !candidate.noNewExchanges

        when(mockRequest.getTreeId()).thenReturn(123);

        // Should throw NoAvailableChannelException when no healthy channels
        assertThrows(ChannelLoadBalancer.NoAvailableChannelException.class, () -> loadBalancer.selectChannel(mockRequest),
                "Should throw exception when no healthy channels available");
    }

     */
    public long getIdleTime() {
        return System.currentTimeMillis() - lastActivityTime;
    }

    /**
     * Check if channel is in healthy state
     *
     * @return true if healthy
     */
    public boolean isHealthy() {
        return state == ChannelState.ACTIVE || state == ChannelState.ESTABLISHED;
    }

    /**
     * Get channel binding hash
     *

    assertThrows(IllegalStateException.class, () -> manager.startAsync().awaitHealthy());
    assertTrue(listener.stoppedCalled);
  }

  /**
   * This covers a bug where listener.healthy would get called when a single service failed during
   * startup (it occurred in more complicated cases also).
   */
  public void testFailStart_singleServiceCallsHealthy() {
    Service a = new FailStartService();

    assertThrows(IllegalStateException.class, () -> manager.startAsync().awaitHealthy());
    assertTrue(listener.stoppedCalled);
  }

  /**
   * This covers a bug where listener.healthy would get called when a single service failed during
   * startup (it occurred in more complicated cases also).
   */
  public void testFailStart_singleServiceCallsHealthy() {
    Service a = new FailStartService();

   * was acquired, or null if no connection was acquired. The acquired connection will also be
   * given to [call] who may (for example) assign it to a [RealCall.connection].
   *
   * This confirms the returned connection is healthy before returning it. If this encounters any
   * unhealthy connections in its search, this will clean them up.
   *
   * If [routes] is non-null these are the resolved routes (ie. IP addresses) for the connection.

      Method langAccess = sharedSecrets.getMethod("getJavaLangAccess");
      return langAccess.invoke(null);
    } catch (ThreadDeath death) {
      throw death;
    } catch (Throwable t) {
      /*
       * This is not one of AppEngine's allowed classes, so even in Sun JDKs, this can fail with

      Method langAccess = sharedSecrets.getMethod("getJavaLangAccess");
      return langAccess.invoke(null);
    } catch (ThreadDeath death) {
      throw death;
    } catch (Throwable t) {
      /*
       * This is not one of AppEngine's allowed classes, so even in Sun JDKs, this can fail with

    try {
      while (true) {
        Request request = requestQueue.take();
        Object result;
        try {
          result = invokeMethod(request.methodName, request.arguments);
        } catch (ThreadDeath death) {
          return;
        } catch (InvocationTargetException exception) {
          responseQueue.put(new Response(request.methodName, null, exception.getTargetException()));
          continue;

    }

    @Test
    void testGetHealthyChannels() throws UnknownHostException {
        assertTrue(channelManager.getHealthyChannels().isEmpty());

        // Add a healthy channel manually for testing
        InetAddress addr = InetAddress.getByName("192.168.1.100");
        NetworkInterfaceInfo localInterface = new NetworkInterfaceInfo(addr, 1000);