--- a/src/main/java/alice/codesegment/OutputDataSegment.java	Mon Apr 21 20:01:24 2014 +0900
+++ b/src/main/java/alice/codesegment/OutputDataSegment.java	Tue Apr 22 04:21:22 2014 +0900
@@ -95,5 +95,14 @@
 	public void ping(String managerKey, String returnKey) {
 		DataSegment.get(managerKey).ping(returnKey);
 	}
+	
+	/**
+	 * this method is to forcibly close socket
+	 * 
+	 * @param managerKey
+	 */
 
+	public void shutdown(String managerKey){
+		DataSegment.get(managerKey).shutdown();
+	}
 }

--- a/src/main/java/alice/datasegment/DataSegmentManager.java	Mon Apr 21 20:01:24 2014 +0900
+++ b/src/main/java/alice/datasegment/DataSegmentManager.java	Tue Apr 22 04:21:22 2014 +0900
@@ -61,7 +61,7 @@
 	public abstract void quickTake(Receiver receiver, CodeSegment cs);
 
 	public abstract void remove(String key);
-	public abstract void shutdown(String key);
+	public abstract void shutdown();
 	public abstract void close();
 	public abstract void finish();
 	

--- a/src/main/java/alice/datasegment/LocalDataSegmentManager.java	Mon Apr 21 20:01:24 2014 +0900
+++ b/src/main/java/alice/datasegment/LocalDataSegmentManager.java	Tue Apr 22 04:21:22 2014 +0900
@@ -165,7 +165,7 @@
 	}
 
 	@Override
-	public void shutdown(String key) {
+	public void shutdown() {
 		
 	}
 

--- a/src/main/java/alice/datasegment/RemoteDataSegmentManager.java	Mon Apr 21 20:01:24 2014 +0900
+++ b/src/main/java/alice/datasegment/RemoteDataSegmentManager.java	Tue Apr 22 04:21:22 2014 +0900
@@ -140,12 +140,6 @@
 	}
 
 	@Override
-	public void close() {
-		Command cmd = new Command(CommandType.CLOSE, null, null, null, 0, 0, null, null, null);
-		connection.sendCommand(cmd);
-	}
-
-	@Override
 	public void ping(String returnKey) {
 		Command cmd = new Command(CommandType.PING, null, returnKey, null, 0, 0, null, null, null);
 		connection.write(cmd);
@@ -158,7 +152,13 @@
 	}
 
 	@Override
-	public void shutdown(String key) {
+	public void close() {
+		Command cmd = new Command(CommandType.CLOSE, null, null, null, 0, 0, null, null, null);
+		connection.sendCommand(cmd);
+	}
+	
+	@Override
+	public void shutdown() {
 		connection.close();
 	}
 

--- a/src/main/java/alice/topology/manager/keeparive/RespondPing.java	Mon Apr 21 20:01:24 2014 +0900
+++ b/src/main/java/alice/topology/manager/keeparive/RespondPing.java	Tue Apr 22 04:21:22 2014 +0900
@@ -20,7 +20,7 @@
 		System.out.println(" Recieved time "+(d.time - pingedTime));
 		if (d.time - pingedTime > 60 * 1000){
 			// need check, this connection is alive. may be close 
-			DataSegment.get(d.from).close();
+			DataSegment.get(d.from).shutdown();
 		} else {
 			// if nowTask close d.from's socket cancel. 
 			// if not remove close task in the Queue.

--- a/src/main/java/alice/topology/manager/keeparive/TaskExecuter.java	Mon Apr 21 20:01:24 2014 +0900
+++ b/src/main/java/alice/topology/manager/keeparive/TaskExecuter.java	Tue Apr 22 04:21:22 2014 +0900
@@ -63,7 +63,7 @@
 				} else if (nowTask.getType() == TaskType.CLOSE) {
 					// no response from the Remote DataSegment. So close this connection.
 					System.out.println("SHOTDOWN");
-					DataSegment.get(nowTask.getManagerKey()).close();
+					DataSegment.get(nowTask.getManagerKey()).shutdown();
 				}
 			}
 			nowTask = null;