--- a/src/main/java/christie/topology/HostMessage.java	Sat Sep 15 17:41:14 2018 +0900
+++ b/src/main/java/christie/topology/HostMessage.java	Sat Sep 15 18:59:12 2018 +0900
@@ -3,34 +3,64 @@
 
 import org.msgpack.annotation.Message;
 
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
 @Message
 public class HostMessage {
-    public String hostName;
-    public int port;
+    private String hostName;
+    private int port;
+    private String nodeName; // this is nodeName which have these IP and port.
+    private String connectionName;
+    private String remoteNodeName;
 
-    public String connectionName;
-    public String nodeName; // this is nodeName which have these IP and port.
+    private String cookie; // MD5
 
-    public String remoteNodeName;
-    public String cookie; // MD5
-
-    public boolean alive;
+    private boolean alive;
 
     public HostMessage() { }
-    public HostMessage(String name, int port) {
-        this.hostName = name;
+
+    public void setLocalHostAndPort(int port){
+        try {
+            this.hostName = InetAddress.getLocalHost().getHostAddress();
+            this.port = port;
+        } catch (UnknownHostException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void setHostAndPort(String hostName, int port) {
+        this.hostName = hostName;
         this.port = port;
     }
 
-    public HostMessage(String name, int port, String connectionName) {
-        this.hostName = name;
-        this.port = port;
+    public void setNodeInfo(String nodeName, String connectionName, String remoteNodeName){
+        this.nodeName = nodeName;
         this.connectionName = connectionName;
+        this.remoteNodeName = remoteNodeName;
+    }
+
+    public void setNodeName(String nodeName) {
+        this.nodeName = nodeName;
     }
 
-    public boolean isAlive() {
-        return alive;
-    }
+    public String getHostName() { return hostName; }
+
+    public int getPort() { return port; }
+
+    public String getNodeName() { return nodeName; }
+
+    public String getConnectionName() { return connectionName; }
+
+    public String getRemoteNodeName() { return remoteNodeName; }
+
+    public void setAlive(boolean alive) { this.alive = alive; }
+
+    public boolean isAlive() { return alive; }
+
+    public void setCookie(String cookie) { this.cookie = cookie; }
+
+    public String getCookie() { return cookie; }
 
     public String toString() {
         return "HostMessage : name = " + hostName + ", port = " + Integer.toString(port) + " connectionName = " +