io.zbus.mq.disk.DiskMessage Maven / Gradle / Ivy

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a lightweight yet powerful MQ and RPC to build service bus

There is a newer version: 1.0.0-b1

package io.zbus.mq.disk;

public class DiskMessage {
	public Long offset; // 8, write ignore
	public Long checksum; // 8
	public String id; // 1 + id(max 39)
	public Long timestamp; // 8
	public Long messageNumber; // 8, write ignore
	public String tag; // 1 + tag(max 127) 
	public byte[] body; // 4 + len 

	public int size(){
		int bodySize = 0;
		if(body != null) bodySize = body.length;
		return 4 + bodySize + BODY_POS;
	}
	
	public boolean valid = true; //default to valid, when tag not found after reading to the end of block
	public int bytesScanned; //when tagging applied, bytesScanned >= size()
	
	public static final int ID_MAX_LEN = 39;
	public static final int TAG_MAX_LEN = 127;
	public static final int BODY_POS = 8 + 8 + 40 + 8 + 8 + 128; //200
	public static final int CHECKSUM_SIZE = 40 + 8 + 8 + 128; 
}