Adding a path for persistent data

To support persistent data with the server, this change
adds a command line argument that specifies where cross
run data can be stored.

Author: vaage

run_server.sh

@@ -17,10 +17,11 @@
 TEAM_ID="$1"
 TEAM_SECRET="$2"
 PORT="$3"
-RELAY_ADDRESS="$4"
+PERSISTENT="$4"
+RELAY_ADDRESS="$5"
 
-if [[ "TEAM_ID" == "" || "$TEAM_SECRET" == "" || "$PORT" == "" ]] ; then
-  echo 'usage: <TEAM ID> <TEAM SECRET> <PORT> [RELAY ADDRESS]'
+if [[ "TEAM_ID" == "" || "$TEAM_SECRET" == "" || "$PORT" == "" || "$PERSISTENT" == "" ]] ; then
+  echo 'usage: <TEAM ID> <TEAM SECRET> <PORT> <PERSISENT> [RELAY ADDRESS]'
   exit 1
 fi
 
@@ -29,11 +30,13 @@ if [ "$RELAY_ADDRESS" == "" ] ; then
   java codeu.chat.ServerMain \
       "$TEAM_ID" \
       "$TEAM_SECRET" \
-      "$PORT"
+      "$PORT" \
+      "$PERSISTENT"
 else
   java codeu.chat.ServerMain \
       "$TEAM_ID" \
       "$TEAM_SECRET" \
       "$PORT" \
+      "$PERSISTENT" \
       "$RELAY_ADDRESS"
 fi

src/codeu/chat/ServerMain.java

@@ -51,8 +51,12 @@ public static void main(String[] args) {
 
     final int myPort = Integer.parseInt(args[2]);
 
-    final RemoteAddress relayAddress = args.length > 3 ?
-                                       RemoteAddress.parse(args[3]) :
+    // This is the directory where it is safe to store data accross runs
+    // of the server.
+    final String persistentPath = args[3];
+
+    final RemoteAddress relayAddress = args.length > 4 ?
+                                       RemoteAddress.parse(args[4]) :
                                        null;
 
     try (