org.mobicents.ss7.hardware.dialogic.InterProcessCommunicator Maven / Gradle / Ivy

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc. and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.ss7.hardware.dialogic;


import java.io.IOException;

/**
 *
 * @author amit bhayani
 * @author Oleg Kulikov
 * @author sergey vetyutnev
 * 
 */
public class InterProcessCommunicator {

	private final static String LIB_NAME = "mobicents-dialogic-linux";

	/** The identifier of the originated module */
	private int source;
	/** The identifier of the destination module */
	private int destination;

	private byte[] readBuffer = new byte[1000];
	
	/**
	 * Creates a new instance of InterProcessCommunicator
	 * 
	 * @param source
	 *            the integer identifier of the originated module
	 * @param destination
	 *            the integer idenifier of the destination module.
	 */
	public InterProcessCommunicator(int source, int destination) {
		this.source = source;
		this.destination = destination;
	}

	/**
	 * Receives a datagram from GCT Interprocess.
	 * 
	 * @return received datagram.
	 */
	public byte[] read() {
		//TODO Make JNI use native ByteBuffer
		
		int len = receive(source, readBuffer);

		if (len == -1) {
			// no messages in queue
			return null;
		}
	
		byte[] tempBuf = new byte[len];
		System.arraycopy(readBuffer, 0, tempBuf, 0, len);
		return tempBuf;
	}

	/**
	 * Sends datagram to the destination module.
	 * 
	 * @param packet
	 *            the datagram to be sent.
	 */
	public int write(byte[] msg) throws IOException {
		//TODO Make JNI use native ByteBuffer

		//TODO I do not sure if "synchronized" needs here, may be dialogic GCT_send() method is thread-safe ? 
		synchronized (this) {
			int status = send(source, destination, msg);

			if (status != 0) {
				throw new IOException("Dialogic card: Can not send packet by GCT_send() method");
			}
			
			return status;
		}
	}

	/**
	 * Actualy receives datagram using Interprocces communication.
	 * 
	 * @param source
	 *            indicates the module id wich will receive datagrams.
	 * @param buffer
	 *            the buffer wich should be used to store recevied message.
	 * @return the actual length of the received message.
	 */
	private native int receive(int source, byte[] buffer);

	/**
	 * Actualy sends the message using interprocces communication.
	 * 
	 * @param source
	 *            the module id wich sends message.
	 * @param destionation
	 *            the module id wich must receive message.
	 * @param buffer
	 *            the buffer contained message.
	 * @return the number of actualy bytes sent.
	 */
	private native int send(int source, int destination, byte[] buffer);

	static {
		try {
			System.loadLibrary(LIB_NAME);
			System.out.println("Loaded library mobicents-dialogic-linux"); 
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}