org.glukit.dexcom.sync.tasks.IsReceiverOnThisPortRunner.java Source code

Introduction

Here is the source code for org.glukit.dexcom.sync.tasks.IsReceiverOnThisPortRunner.java

Source

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2013 Alexandre Normand
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package org.glukit.dexcom.sync.tasks;

import com.google.common.util.concurrent.SimpleTimeLimiter;
import com.google.inject.Inject;
import jssc.SerialPort;
import jssc.SerialPortException;
import jssc.SerialPortTimeoutException;
import org.glukit.dexcom.sync.DataInputFactory;
import org.glukit.dexcom.sync.DataOutputFactory;
import org.glukit.dexcom.sync.ResponseReader;
import org.glukit.dexcom.sync.g4.DexcomG4Constants;
import org.glukit.dexcom.sync.requests.Ping;
import org.glukit.dexcom.sync.responses.GenericResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import static java.lang.String.format;
import static org.glukit.dexcom.sync.DecodingUtils.toHexString;

/**
 * Checks if a given serial device is actually the dexcom receiver.
 *
 * @author alexandre.normand
 */
public class IsReceiverOnThisPortRunner {
    private static Logger LOGGER = LoggerFactory.getLogger(IsReceiverOnThisPortRunner.class);

    private DataOutputFactory dataOutputFactory;
    private DataInputFactory dataInputFactory;
    private ResponseReader responseReader;

    @Inject
    public IsReceiverOnThisPortRunner(DataOutputFactory dataOutputFactory, DataInputFactory dataInputFactory,
            ResponseReader responseReader) {
        this.dataOutputFactory = dataOutputFactory;
        this.dataInputFactory = dataInputFactory;
        this.responseReader = responseReader;
    }

    public boolean isReceiver(String portName) {
        ExecutorService executor = Executors.newSingleThreadExecutor();
        final SerialPort serialPort = new SerialPort(portName);
        try {

            SimpleTimeLimiter timeout = new SimpleTimeLimiter(executor);
            Boolean result = timeout.callWithTimeout(new Callable<Boolean>() {
                @Override
                public Boolean call() throws Exception {
                    return isFirmware(serialPort);
                }
            }, 5, TimeUnit.SECONDS, true);

            return result;
        } catch (Exception e) {
            LOGGER.info("Receiver not running on this port since we had an exception while checking.", e);
            return false;
        } finally {
            executor.shutdown();
            if (serialPort.isOpened()) {
                try {
                    LOGGER.debug(format("Closing port %s", serialPort.getPortName()));
                    serialPort.closePort();
                } catch (SerialPortException e) {
                    LOGGER.warn("Error closing port, ignoring.", e);
                }
            }
        }
    }

    private boolean isFirmware(SerialPort serialPort) throws SerialPortException, SerialPortTimeoutException {
        serialPort.openPort();

        if (!serialPort.isOpened()) {
            LOGGER.info(
                    format("Couldn't open port %s, assuming this is not the receiver", serialPort.getPortName()));
            return false;
        }

        printLineStatus(serialPort.getLinesStatus());
        LOGGER.debug(format("Opened port [%s]: %b", serialPort.getPortName(), serialPort.isOpened()));
        serialPort.setParams(DexcomG4Constants.FIRMWARE_BAUD_RATE, DexcomG4Constants.DATA_BITS,
                DexcomG4Constants.STOP_BITS, DexcomG4Constants.NO_PARITY);

        byte[] request = new Ping(this.dataOutputFactory).asBytes();
        LOGGER.debug(format("Ping with write of [%d] bytes: [%s]", request.length, toHexString(request)));

        boolean status = serialPort.writeBytes(request);
        LOGGER.info(format("Wrote success: %b", status));

        GenericResponse genericResponse = this.responseReader.read(GenericResponse.class, serialPort);
        LOGGER.info(format("Received successful ACK response [%s]", toHexString(genericResponse.getPayload())));
        return true;
    }

    private void printLineStatus(int[] statuses) {
        for (int status : statuses) {
            LOGGER.debug(format("Line status is %d", status));
        }
    }
}