From 773c4b8a696dd49b3f0452783e1634350a82226a Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sun, 1 Dec 2024 13:08:59 -0500
Subject: pass network interface name to sequencer explicitely

---
 src/main/java/derms/Sequencer.java | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

(limited to 'src/main/java/derms/Sequencer.java')

diff --git a/src/main/java/derms/Sequencer.java b/src/main/java/derms/Sequencer.java
index 530e0c1..88b15a1 100644
--- a/src/main/java/derms/Sequencer.java
+++ b/src/main/java/derms/Sequencer.java
@@ -6,6 +6,7 @@ import derms.net.tomulticast.TotalOrderMulticastSender;
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
+import java.net.NetworkInterface;
 import java.util.logging.Logger;
 
 /**
@@ -13,7 +14,7 @@ import java.util.logging.Logger;
  * sends them to the RMs via {@link derms.net.tomulticast.TotalOrderMulticastSender}.
  */
 public class Sequencer implements Runnable {
-    public static final String usage = "Usage: java Sequencer <laddr>";
+    public static final String usage = "Usage: java Sequencer <ip address> <network interface>";
 
     private final ReliableUnicastReceiver<Request> in; // From FE.
     private final TotalOrderMulticastSender<Request> out; // To RMs.
@@ -22,10 +23,11 @@ public class Sequencer implements Runnable {
     /**
      *
      * @param laddr The local IP address.
+     * @param ifs The network interface to use.
      */
-    public Sequencer(InetAddress laddr) throws IOException {
+    public Sequencer(InetAddress laddr, NetworkInterface ifs) throws IOException {
         this.in = new ReliableUnicastReceiver<Request>(new InetSocketAddress(laddr, Config.sequencerInPort));
-        this.out = new TotalOrderMulticastSender<Request>(Config.group, laddr);
+        this.out = new TotalOrderMulticastSender<Request>(Config.group, laddr, ifs);
         this.log = Logger.getLogger(getClass().getName());
     }
 
@@ -41,7 +43,7 @@ public class Sequencer implements Runnable {
 
         Sequencer seq = null;
         try {
-            seq = new Sequencer(args.laddr);
+            seq = new Sequencer(args.laddr, args.ifs);
         } catch (IOException e) {
             System.err.println(e.getMessage());
             System.exit(1);
@@ -82,15 +84,25 @@ public class Sequencer implements Runnable {
 
     private static class Args {
         private final InetAddress laddr;
+        private final NetworkInterface ifs;
 
         private Args(String[] args) throws IllegalArgumentException {
             if (args.length < 1) {
-                throw new IllegalArgumentException("Missing argument 'laddr'");
+                throw new IllegalArgumentException("Missing argument 'ip address'");
             }
             try {
                 this.laddr = InetAddress.getByName(args[0]);
             } catch (Exception e) {
-                throw new IllegalArgumentException("Bad value of 'laddr': " + e.getMessage());
+                throw new IllegalArgumentException("Bad value of 'ip address': " + e.getMessage());
+            }
+
+            if (args.length < 2) {
+                throw new IllegalArgumentException("Missing argument 'network interface'");
+            }
+            try {
+                this.ifs = NetworkInterface.getByName(args[1]);
+            } catch (Exception e ) {
+                throw new IllegalArgumentException("Bad value of 'network interface': " + e.getMessage());
             }
         }
     }
-- 
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