ru.jts_dev.common.tcp.ProtocolByteArrayLengthHeaderSerializer.java Source code

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Here is the source code for ru.jts_dev.common.tcp.ProtocolByteArrayLengthHeaderSerializer.java

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/*
 * Copyright (c) 2015, 2016, 2017 JTS-Team authors and/or its affiliates. All rights reserved.
 *
 * This file is part of JTS-V3 Project.
 *
 * JTS-V3 Project is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JTS-V3 Project is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JTS-V3 Project.  If not, see <http://www.gnu.org/licenses/>.
 */

package ru.jts_dev.common.tcp;

import org.springframework.integration.ip.tcp.serializer.ByteArrayLengthHeaderSerializer;
import org.springframework.integration.ip.tcp.serializer.SoftEndOfStreamException;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;

import static java.nio.ByteOrder.LITTLE_ENDIAN;

/**
 * @author Camelion
 * @since 30.11.15
 */
public class ProtocolByteArrayLengthHeaderSerializer extends ByteArrayLengthHeaderSerializer {
    private final int headerSize = HEADER_SIZE_UNSIGNED_SHORT;

    @Override
    protected void writeHeader(OutputStream outputStream, int length) throws IOException {
        ByteBuffer lengthPart = ByteBuffer.allocate(this.headerSize).order(LITTLE_ENDIAN);
        length += headerSize; // Protocol thing, length represent header size + data size
        switch (this.headerSize) {
        case HEADER_SIZE_INT:
            lengthPart.putInt(length);
            break;
        case HEADER_SIZE_UNSIGNED_BYTE:
            if (length > 0xff) {
                throw new IllegalArgumentException(
                        "Length header:" + headerSize + " too short to accommodate message length:" + length);
            }
            lengthPart.put((byte) length);
            break;
        case HEADER_SIZE_UNSIGNED_SHORT:
            if (length > 0xffff) {
                throw new IllegalArgumentException(
                        "Length header:" + headerSize + " too short to accommodate message length:" + length);
            }
            lengthPart.putShort((short) length);
            break;
        default:
            throw new IllegalArgumentException("Bad header size:" + headerSize);
        }
        outputStream.write(lengthPart.array());
    }

    @Override
    protected int readHeader(InputStream inputStream) throws IOException {
        byte[] lengthPart = new byte[this.headerSize];
        try {
            int status = read(inputStream, lengthPart, true);
            if (status < 0) {
                throw new SoftEndOfStreamException("Stream closed between payloads");
            }
            int messageLength;
            switch (this.headerSize) {
            case HEADER_SIZE_INT:
                messageLength = ByteBuffer.wrap(lengthPart).order(LITTLE_ENDIAN).getInt();
                if (messageLength < 0) {
                    throw new IllegalArgumentException("Length header:" + messageLength + " is negative");
                }
                break;
            case HEADER_SIZE_UNSIGNED_BYTE:
                messageLength = ByteBuffer.wrap(lengthPart).order(LITTLE_ENDIAN).get() & 0xff;
                break;
            case HEADER_SIZE_UNSIGNED_SHORT:
                messageLength = ByteBuffer.wrap(lengthPart).order(LITTLE_ENDIAN).getShort() & 0xffff;
                break;
            default:
                throw new IllegalArgumentException("Bad header size:" + headerSize);
            }

            messageLength -= headerSize; // substract header size from data
            return messageLength;
        } catch (SoftEndOfStreamException e) {
            throw e;
        } catch (IOException | RuntimeException e) {
            publishEvent(e, lengthPart, -1);
            throw e;
        }
    }
}