--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/main/java/alice/topology/manager/CheckComingHost.java	Mon Aug 11 18:23:18 2014 +0900
@@ -0,0 +1,50 @@
+package alice.topology.manager;
+
+import java.util.LinkedList;
+
+import alice.codesegment.CodeSegment;
+import alice.datasegment.CommandType;
+import alice.datasegment.Receiver;
+import alice.topology.HostMessage;
+
+public class CheckComingHost extends CodeSegment {
+    // checkIncomingHost
+    private Receiver host = ids.create(CommandType.TAKE); 
+    private Receiver messageList = ids.create(CommandType.PEEK); // HostMessage List
+    
+    public CheckComingHost(){
+        this.host.setKey("host");
+        this.messageList.setKey("messageList");
+    }
+    
+    @Override
+    public void run() {
+        HostMessage host = this.host.asClass(HostMessage.class);
+        @SuppressWarnings("unchecked")
+        LinkedList<HostMessage> messageList = this.messageList.asClass(LinkedList.class);
+        boolean match = false;
+        // check cookie
+        if (host.cookie != null) {
+            for (HostMessage hostMessage : messageList) {
+                if (host.cookie.equals(hostMessage.cookie)) {
+                    match = true;
+                    host.absName = hostMessage.absName;
+                    break;
+                }
+            }
+        }
+        
+        if (match){ 
+            // coming host has ever joined this App
+            System.out.println("reconnect host");
+            ods.put("reconnectHost", host);
+        } else {
+            System.out.println("new host");
+            ods.put("orderHash", "order");
+            ods.put("newHost", host);
+        }
+        
+       new CheckComingHost();
+    }
+
+}