package com.intelligt.modbus.jlibmodbus.serial;
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import java.io.IOException;
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import java.util.concurrent.LinkedBlockingDeque;
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import java.util.concurrent.TimeUnit;
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/*
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* Copyright (C) 2017 "Invertor" Factory", JSC
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* [http://www.sbp-invertor.ru]
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*
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* This file is part of JLibModbus.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Authors: Kevin Kieffer.
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* email: <kkieffer@adaptivemethods.com>
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*/
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/**
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* @author Kevin Kieffer
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* @since 1.9.0
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*/
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public class SerialPortLoopback extends SerialPort {
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//This must be static to be used by all class instances
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private static final LinkedBlockingDeque<Byte> tx_from_master_fifo = new LinkedBlockingDeque<Byte>(8192);
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private static final LinkedBlockingDeque<Byte> rx_to_master_fifo = new LinkedBlockingDeque<Byte>(8192);
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private final LinkedBlockingDeque<Byte> myWriteFifo;
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private final LinkedBlockingDeque<Byte> myReadFifo;
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private boolean isOpen = false;
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public SerialPortLoopback(SerialParameters sp, boolean isMaster) throws SerialPortException {
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super(sp);
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if (isMaster) {
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myWriteFifo = tx_from_master_fifo;
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myReadFifo = rx_to_master_fifo;
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} else {
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myWriteFifo = rx_to_master_fifo;
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myReadFifo = tx_from_master_fifo;
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}
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}
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@Override
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public void write(int b) throws IOException {
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if (!myWriteFifo.offer((byte) b))
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throw new IOException("Loopback fifo full");
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}
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@Override
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public void write(byte[] bytes) throws IOException {
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if (!isOpen)
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throw new IOException("Loopback is not open");
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for (Byte b : bytes) {
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if (!myWriteFifo.offer(b))
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throw new IOException("Loopback fifo is full");
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}
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}
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@Override
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public void open() throws SerialPortException {
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isOpen = true;
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}
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@Override
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public int read() throws IOException {
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if (!isOpen)
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throw new IOException("Loopback is not open");
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try {
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Byte b = myReadFifo.poll((long) getReadTimeout(), TimeUnit.MILLISECONDS);
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if (b == null)
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throw new IOException("Timeout");
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return (int) b & 0xff;
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} catch (InterruptedException ex) {
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throw new IOException(ex);
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}
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}
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@Override
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public int read(byte[] b, int off, int len) throws IOException {
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int count = 0;
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for (int i = 0; i < len; i++) {
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try {
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Byte y = myReadFifo.poll((long) getReadTimeout(), TimeUnit.MILLISECONDS);
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if (y == null)
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break;
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b[i + off] = y;
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count++;
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} catch (InterruptedException ex) {
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throw new IOException(ex);
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}
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}
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if (count == 0)
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throw new IOException("Timeout");
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return count;
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}
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@Override
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public void close() {
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isOpen = false;
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}
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@Override
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public boolean isOpened() {
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return isOpen;
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}
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}
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