Moved Netty messaging out of onos-core-dist to under onos-utils
diff --git a/utils/netty/src/main/java/org/onlab/netty/messaging/Response.java b/utils/netty/src/main/java/org/onlab/netty/messaging/Response.java
new file mode 100644
index 0000000..04675ce
--- /dev/null
+++ b/utils/netty/src/main/java/org/onlab/netty/messaging/Response.java
@@ -0,0 +1,36 @@
+package org.onlab.netty;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * Response object returned when making synchronous requests.
+ * Can you used to check is a response is ready and/or wait for a response
+ * to become available.
+ *
+ * @param <T> type of response.
+ */
+public interface Response<T> {
+
+ /**
+ * Gets the response waiting for a designated timeout period.
+ * @param timeout timeout period (since request was sent out)
+ * @param tu unit of time.
+ * @return response
+ * @throws TimeoutException if the timeout expires before the response arrives.
+ */
+ public T get(long timeout, TimeUnit tu) throws TimeoutException;
+
+ /**
+ * Gets the response waiting for indefinite timeout period.
+ * @return response
+ * @throws InterruptedException if the thread is interrupted before the response arrives.
+ */
+ public T get() throws InterruptedException;
+
+ /**
+ * Checks if the response is ready without blocking.
+ * @return true if response is ready, false otherwise.
+ */
+ public boolean isReady();
+}