--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pathfinder/ChannelSimulator.java	Thu Nov 08 12:21:25 2007 +0900
@@ -0,0 +1,41 @@
+package pathfinder;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+public class ChannelSimulator<P> {
+	public NetworkSimulator<P> ns;
+	public Queue<P>[] q;
+
+	public ChannelSimulator() {
+	}
+/*
+	public ChannelSimulator(NetworkSimulator<P> ns){
+		q = new Queue<P>[2];
+		q[0] = new LinkedList<P>(); 
+		q[1] = new LinkedList<P>(); 
+		this.ns = ns;
+	}
+*/
+	public ChannelSimulator(NetworkSimulator<P> _ns){
+		this(new LinkedList<P>(), new LinkedList<P>(), _ns);
+	}
+	public ChannelSimulator(Queue<P> _a, Queue<P> _b, NetworkSimulator<P> ns){
+		q = new Queue[2];
+		q[0] = _a;
+		q[1] = _b;
+		this.ns = ns;
+	}
+
+	public P read(){
+		return ns.read(q[0]);
+	}
+
+	public boolean write(P p){
+		return ns.write(q[1],p);
+	}
+
+	public ChannelSimulator<P> getServerChannel() {
+		return new ChannelSimulator<P>(q[1], q[0],ns);
+	}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pathfinder/NetworkSimulator.java	Thu Nov 08 12:21:25 2007 +0900
@@ -0,0 +1,34 @@
+package pathfinder;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.Queue;
+
+public class NetworkSimulator<P> {
+	
+	public LinkedList<ChannelSimulator<P>> acceptList;
+	public ArrayList<ChannelSimulator<P>> connectList;
+
+	public NetworkSimulator(){
+		acceptList = new LinkedList<ChannelSimulator<P>>();
+		connectList = new ArrayList<ChannelSimulator<P>>();
+	}
+
+	public ChannelSimulator<P> accept(){
+		ChannelSimulator<P> cs = acceptList.poll();
+		connectList.add(cs);
+		
+		return cs.getServerChannel();
+	}
+	public void connect(ChannelSimulator<P> cs){
+		acceptList.add(cs);
+	}
+	
+	public synchronized P read(Queue<P>q) {
+		return q.poll();
+	}
+
+	public synchronized boolean write(Queue<P>q,P p) {
+		return q.add(p);
+	}
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pathfinder/SeMaEmulator.java	Thu Nov 08 12:21:25 2007 +0900
@@ -0,0 +1,32 @@
+package pathfinder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class SeMaEmulator<P> implements Runnable {
+	private List<ChannelSimulator<P>> csList;
+	
+	public SeMaEmulator(){
+		csList = new ArrayList<ChannelSimulator<P>>();
+	}
+
+	public ChannelSimulator<P> addChannelSimulator(ChannelSimulator<P> cs){
+		csList.add(cs);
+		return cs;
+	}
+
+	public void run(){
+		int i=0;
+		P packet;
+		ChannelSimulator<P> cs = csList.get(1);
+
+		/* Main Loop */
+		while(true){
+			packet=cs.read();
+			i = (i+1)%csList.size();
+			cs = csList.get(i+1);
+			if (packet!=null) cs.write(packet);
+		}
+	}
+	
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pathfinder/Test.java	Thu Nov 08 12:21:25 2007 +0900
@@ -0,0 +1,29 @@
+package pathfinder;
+
+public class Test {
+	NetworkSimulator<String> ns;
+	
+	ChannelSimulator<String>  client;
+	ChannelSimulator<String>  server;
+	
+	public static void main(String [] arg)  {
+		Test test = new Test();
+		test.test();
+	}
+	
+	void test() {
+		ns = new NetworkSimulator<String>();
+		client = new ChannelSimulator<String>(ns);
+		ns.connect(client);
+		server = ns.accept();
+		
+		client.write("client write some thing");
+		
+		System.out.println(server.read());
+		
+	}
+	
+	void thread() {
+		
+	}
+}