require(keepAliveDuration > 0L) { "keepAliveDuration <= 0: $keepAliveDuration" }
  }

  fun idleConnectionCount(): Int {
    return connections.count {
      it.withLock { it.calls.isEmpty() }
    }
  }

  fun connectionCount(): Int {
    return connections.size
  }

  /**
   * Attempts to acquire a recycled connection to [address] for [connectionUser]. Returns the connection if it

        cipher.init(Cipher.DECRYPT_MODE, dataKey);

        int plainDataLength = data.length - KerberosConstants.CHECKSUM_SIZE;
        byte[] plainData = cipher.doFinal(data, KerberosConstants.CHECKSUM_SIZE, plainDataLength);

        byte[] plainDataChecksum = getHmac(plainData, codeHmac);
        if ( plainDataChecksum.length >= KerberosConstants.CHECKSUM_SIZE )
            for ( int i = 0; i < KerberosConstants.CHECKSUM_SIZE; i++ )

        return NtlmUtil.computeResponse(responseKeyLM, serverChallenge, clientChallenge, 0, clientChallenge.length);
    }


    static byte[] computeResponse ( byte[] responseKey, byte[] serverChallenge, byte[] clientData, int offset, int length ) {
        MessageDigest hmac = Crypto.getHMACT64(responseKey);
        hmac.update(serverChallenge);
        hmac.update(clientData, offset, length);
        byte[] mac = hmac.digest();

            return new Integer(3);
        }

        /**
         * @param arg1
         * @param arg2
         * @return int
         */
        public int add2(final int arg1, final int arg2) {
            return arg1 + arg2;
        }

        /**
         * @param arg
         * @return Integer
         */

        this.second = second;
    }

    @Override
    public String toString() {
        return "{" + first + ", " + second + "}";
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((first == null) ? 0 : first.hashCode());
        result = prime * result + ((second == null) ? 0 : second.hashCode());
        return result;
    }

    }

    /**
     * Get the proxy port.
     *
     * @return proxy server port
     */
    public int getPort() {
        return port;
    }

    /**
     * Set the proxy port.
     *
     * @param port proxy server port
     */
    public void setPort(int port) {
        this.port = port;
    }

    /**
     * Get the proxy username.
     *

            Objects.equals(parameters, that.parameters) &&
            Objects.equals(returnType, that.returnType);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), name, ownerClass, parameters, returnType);
    }

    public ClassMetaData getOwnerClass() {
        return ownerClass;
    }

            final StringBuilder readingBuf = new StringBuilder(text.length());
            if (readingTokenList != null && termTokenList != null) {
                int offset = 0;
                for (int i = 0; i < readingTokenList.size(); i++) {
                    final String term = termTokenList.get(i).getTerm();
                    String reading = readingTokenList.get(i).getTerm();

    for (List<E> subList : asList(copy, head, tail)) {
      for (int index : asList(-1, subList.size())) {
        assertThrows(IndexOutOfBoundsException.class, () -> subList.get(index));
      }
    }
  }

  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testSubList_contains() {
    List<E> list = getList();
    int size = getNumElements();
    List<E> copy = list.subList(0, size);

    for (List<E> subList : asList(copy, head, tail)) {
      for (int index : asList(-1, subList.size())) {
        assertThrows(IndexOutOfBoundsException.class, () -> subList.get(index));
      }
    }
  }

  @CollectionSize.Require(absent = {ZERO, ONE})
  public void testSubList_contains() {
    List<E> list = getList();
    int size = getNumElements();
    List<E> copy = list.subList(0, size);