Notification.java

package com.techq.available.quorum;

import java.nio.ByteBuffer;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
 * 
 * @author CHQ
 * 2012-2-3
 */
public class Notification {
	static Logger LOG = LoggerFactory.getLogger(Notification.class);
	public static enum mType {
		DISAGREE, PROPOSE, ACCEPT, AGREEMENT, UNKNOW, PING, ACK, CONFIRM
	}
	int seq = 0;


	public Notification(mType type, long leader, long zxid, long logicalClock, ServerState state,
			long sid, long from) {
		this.type = type; 
		this.leader = leader;
		this.zxid = zxid;
		this.logicalClock = logicalClock;
		this.state = state;
		this.sid = sid;
		this.from = from;
	}
	
	public Notification() {};
	
	public static mType getTypeByInt(int val) {
		mType type;
		switch(val) {
		//DISAGREE, PROPOSE, ACCEPT, AGREEMENT, UNKNOW
		case 0:
			type = Notification.mType.DISAGREE;
			break;
		case 1:
			type = Notification.mType.PROPOSE;
			break;
		case 2:
			type = Notification.mType.ACCEPT;
			break;
		case 3:
			//LOG.info("find it");
			type = Notification.mType.AGREEMENT;
			break;
		case 4:
			type = Notification.mType.UNKNOW;
			break;
		case 5:
			type = Notification.mType.PING;
			break;
		case 6:
			type = Notification.mType.ACK;
			break;
		case 7:
			type = Notification.mType.CONFIRM;
			break;
		default:
			LOG.error("what's this? value:" + val);
			type = Notification.mType.UNKNOW;
			break;
		}
		return type;
	}
	
	public static ServerState getStateByInt(int val) {
		switch (val) {
		case 0:
			return ServerState.LOOKING;
		case 1:
			return ServerState.FOLLOWING;
		case 2:
			return ServerState.LEADING;
		default:
			return null;
		}
	}
	
	
	public ByteBuffer toBuffer() {
		int len = DebugConfig.debug ? Message.DEFAULT_SIZE + 4 : Message.DEFAULT_SIZE;
		byte requestBytes[] = new byte[len];
		ByteBuffer requestBuffer = ByteBuffer.wrap(requestBytes);

		/*
		 * Building notification packet to send
		 */

		
		/**
		 * int 4byte long 4 * 8 byte
		 * total bytes: 36bytes
		 */
		requestBuffer.clear();
		requestBuffer.putInt(this.type.ordinal());
		requestBuffer.putInt(this.state.ordinal());
		requestBuffer.putLong(this.leader);
		requestBuffer.putLong(this.zxid);
		requestBuffer.putLong(this.logicalClock);
		requestBuffer.putLong(this.from);//from which peer
		if (DebugConfig.debug) {
			requestBuffer.putInt(this.seq);
		}
		return requestBuffer;
	}
	

	mType type;
	/*
	 * Proposed leader in the case of notification
	 */
	long leader;
	
	/*
	 * id contains the tag for acks, and zxid for notifications
	 */
	long zxid;

	/*
	 * Epoch
	 */
	long logicalClock;

	/*
	 * Current state;
	 */
	ServerState state;

	/*
	 * Address of recipient
	 */
	long sid;
	
	
	long from;


	
	
	

	public int getSeq() {
		return seq;
	}

	public void setSeq(int seq) {
		this.seq = seq;
	}


	
	@Override
	public String toString() {
		if (DebugConfig.debug) {
			return "Notification [type=" + type + ", leader=" + leader + ", zxid="
			+ zxid + ", logicalClock=" + logicalClock + ", state=" + state
			+ ", sid=" + sid + ", from=" + from + ", seq=" + seq + "]";
		}
		return "Notification [type=" + type + ", leader=" + leader + ", zxid="
				+ zxid + ", logicalClock=" + logicalClock + ", state=" + state
				+ ", sid=" + sid + ", from=" + from + "]";
	}

	public mType getType() {
		return type;
	}





	public void setType(mType type) {
		this.type = type;
	}





	public long getLeader() {
		return leader;
	}





	public void setLeader(long leader) {
		this.leader = leader;
	}





	public long getZxid() {
		return zxid;
	}





	public void setZxid(long zxid) {
		this.zxid = zxid;
	}





	public long getLogicalClock() {
		return logicalClock;
	}





	public void setLogicalClock(long logicalClock) {
		this.logicalClock = logicalClock;
	}





	public ServerState getState() {
		return state;
	}





	public void setState(ServerState state) {
		this.state = state;
	}





	public long getSid() {
		return sid;
	}





	public void setSid(long sid) {
		this.sid = sid;
	}





	public long getFrom() {
		return from;
	}





	public void setFrom(long from) {
		this.from = from;
	}





	
	
	
	
	
	
	
	
}