take advantage of better API to simplify test/example code

Author: rade

test/src/com/rabbitmq/client/test/BrokerTestCase.java

@@ -129,20 +129,8 @@ public void checkShutdownSignal(int expectedCode, IOException ioe) {
         checkShutdownSignal(expectedCode, sse);
     }
 
-    public void checkShutdownSignal(int expectedCode, AlreadyClosedException ace) {
-        ShutdownNotifierComponent snc = (ShutdownNotifierComponent) ace.getReference();
-        ShutdownSignalException sse = snc.getCloseReason();
-        checkShutdownSignal(expectedCode, sse);
-    }
-
     public void checkShutdownSignal(int expectedCode, ShutdownSignalException sse) {
-        Object reason = sse.getReason();
-        Method method;
-        if (reason instanceof Command) {
-            method = ((Command) reason).getMethod();
-        } else {
-            method = (Method) reason;
-        }
+        Method method = sse.getReason();
         channel = null;
         if (sse.isHardError()) {
             connection = null;

test/src/com/rabbitmq/examples/perf/MulticastParams.java

@@ -237,9 +237,8 @@ private static boolean exists(Connection connection, Checker checker) throws IOE
         }
         catch (IOException e) {
             ShutdownSignalException sse = (ShutdownSignalException) e.getCause();
-            Command closeCommand = (Command) sse.getReason();
             if (!sse.isHardError()) {
-                AMQP.Channel.Close closeMethod = (AMQP.Channel.Close) closeCommand.getMethod();
+                AMQP.Channel.Close closeMethod = (AMQP.Channel.Close) sse.getReason();
                 if (closeMethod.getReplyCode() == AMQP.NOT_FOUND) {
                     return false;
                 }