ch.usi.da.smr.message.Message.java Source code

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Here is the source code for ch.usi.da.smr.message.Message.java

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package ch.usi.da.smr.message;
/* 
 * Copyright (c) 2013 Universit della Svizzera italiana (USI)
 * 
 * This file is part of URingPaxos.
 *
 * URingPaxos 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.
 *
 * URingPaxos 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 URingPaxos.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.ArrayList;
import java.util.List;

import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;
import org.apache.thrift.TSerializer;
import org.apache.thrift.protocol.TBinaryProtocol;

import ch.usi.da.smr.thrift.gen.Cmd;
import ch.usi.da.smr.thrift.gen.Decision;

/**
 * Name: Message<br>
 * Description: <br>
 * 
 * Creation date: Mar 13, 2012<br>
 * $Id$
 * 
 * @author Samuel Benz benz@geoid.ch
 */
public class Message {

    private final int id;

    private final String from;

    private final String to;

    private final List<Command> commands;

    private long instance = 0;

    private int ring = 0;

    private boolean skip = false;

    public Message(int id, String from, String to, List<Command> commands) {
        this.id = id;
        this.from = from;
        this.to = to;
        this.commands = commands;
    }

    public int getID() {
        return id;
    }

    public String getFrom() {
        return from;
    }

    public String getTo() {
        return to;
    }

    public List<Command> getCommands() {
        return commands;
    }

    public void setInstance(long instance) {
        this.instance = instance;
    }

    public long getInstnce() {
        return instance;
    }

    public void setRing(int ring) {
        this.ring = ring;
    }

    public int getRing() {
        return ring;
    }

    public void setSkip(boolean skip) {
        this.skip = skip;
    }

    public boolean isSkip() {
        return skip;
    }

    public String toString() {
        return ("Message id:" + id + " from:" + from + " to:" + to + " " + commands);
    }

    public boolean equals(Object obj) {
        if (obj instanceof Message) {
            if (this.id == ((Message) obj).getID()) {
                return true;
            }
        }
        return false;
    }

    public int hashCode() {
        return id;
    }

    public static byte[] toByteArray(Message m) {
        TSerializer serializer = new TSerializer(new TBinaryProtocol.Factory());
        ch.usi.da.smr.thrift.gen.Message msg = new ch.usi.da.smr.thrift.gen.Message();
        msg.setId(m.getID());
        msg.setFrom(m.getFrom());
        msg.setTo(m.getTo());
        List<Cmd> cmds = new ArrayList<Cmd>();
        for (Command c : m.getCommands()) {
            cmds.add(Command.toCmd(c));
        }
        msg.setCommands(cmds);
        try {
            return serializer.serialize(msg);
        } catch (TException e) {
            return new byte[0];
        }
    }

    public static Message fromDecision(Decision decision) {
        Message m = null;
        if (decision.isSetValue() && decision.getValue().isSkip()) {
            m = new Message(0, "", "", null);
            m.setSkip(true);
        } else {
            m = fromByteArray(decision.getValue().getCmd());
        }
        if (m != null) {
            m.setInstance(decision.getInstance());
            m.setRing(decision.getRing());
        }
        return m;
    }

    public static Message fromDecision(ch.usi.da.paxos.storage.Decision decision) {
        Message m = null;
        if (decision.getValue() != null && decision.getValue().isSkip()) {
            m = new Message(0, "", "", null);
            m.setSkip(true);
        } else {
            m = fromByteArray(decision.getValue().getValue());
        }
        if (m != null) {
            m.setInstance(decision.getInstance());
            m.setRing(decision.getRing());
        }
        return m;
    }

    public static Message fromByteArray(byte[] b) {
        TDeserializer deserializer = new TDeserializer(new TBinaryProtocol.Factory());
        ch.usi.da.smr.thrift.gen.Message m = new ch.usi.da.smr.thrift.gen.Message();
        try {
            deserializer.deserialize(m, b);
            if (m.to == null) {
                return null;
            }
        } catch (TException e) {
            return null;
        }
        List<Command> cmds = new ArrayList<Command>();
        for (Cmd c : m.getCommands()) {
            cmds.add(Command.toCommand(c));
        }
        return new Message(m.getId(), m.getFrom(), m.getTo(), cmds);
    }
}