svn commit: r1528369 - /tomcat/trunk/webapps/examples/WEB-INF/classes/websocket/snake/SnakeAnnotation.java

[ma...@apache.org]

Author: markt
Date: Wed Oct  2 08:37:51 2013
New Revision: 1528369

URL: http://svn.apache.org/r1528369
Log:
Handle error when user closes browser while playing snake game.

Modified:
    tomcat/trunk/webapps/examples/WEB-INF/classes/websocket/snake/SnakeAnnotation.java

Modified: tomcat/trunk/webapps/examples/WEB-INF/classes/websocket/snake/SnakeAnnotation.java
URL: http://svn.apache.org/viewvc/tomcat/trunk/webapps/examples/WEB-INF/classes/websocket/snake/SnakeAnnotation.java?rev=1528369&r1=1528368&r2=1528369&view=diff
==============================================================================
--- tomcat/trunk/webapps/examples/WEB-INF/classes/websocket/snake/SnakeAnnotation.java (original)
+++ tomcat/trunk/webapps/examples/WEB-INF/classes/websocket/snake/SnakeAnnotation.java Wed Oct  2 08:37:51 2013
@@ -17,11 +17,13 @@
 package websocket.snake;
 
 import java.awt.Color;
+import java.io.EOFException;
 import java.util.Iterator;
 import java.util.Random;
 import java.util.concurrent.atomic.AtomicInteger;
 
 import javax.websocket.OnClose;
+import javax.websocket.OnError;
 import javax.websocket.OnMessage;
 import javax.websocket.OnOpen;
 import javax.websocket.Session;
@@ -110,4 +112,24 @@ public class SnakeAnnotation {
         SnakeTimer.broadcast(String.format("{\"type\": \"leave\", \"id\": %d}",
                 Integer.valueOf(id)));
     }
+
+
+    @OnError
+    public void onError(Throwable t) throws Throwable {
+        // Most likely cause is a user closing their browser. Check to see if
+        // the root cause is EOF and if it is ignore it.
+        // Protect against infinite loops.
+        int count = 0;
+        Throwable root = t;
+        while (root.getCause() != null && count < 20) {
+            root = root.getCause();
+            count ++;
+        }
+        if (root instanceof EOFException) {
+            // Assume this is triggered by the user closing their browser and
+            // ignore it.
+        } else {
+            throw t;
+        }
+    }
 }



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