Github user rbnks commented on a diff in the pull request:
https://github.com/apache/incubator-streams/pull/99#discussion_r18608539
--- Diff:
streams-runtimes/streams-runtime-local/src/main/java/org/apache/streams/local/queues/ThroughputQueue.java
---
@@ -0,0 +1,384 @@
+package org.apache.streams.local.queues;
+
+import net.jcip.annotations.GuardedBy;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import sun.reflect.generics.reflectiveObjects.NotImplementedException;
+
+import javax.management.*;
+import java.lang.management.ManagementFactory;
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+/**
+ * A {@link java.util.concurrent.BlockingQueue} implementation that allows
the measure measurement of how
+ * data flows through the queue. Is also a {@code MBean} so the flow
statistics can be viewed through
+ * JMX. Registration of the bean happens whenever a constructor receives a
non-null id.
+ *
+ * !!! Warning !!!
+ * Only the necessary methods for the local streams runtime are
implemented. All other methods throw a
+ * {@link sun.reflect.generics.reflectiveObjects.NotImplementedException}.
+ */
+public class ThroughputQueue<E> implements BlockingQueue<E>,
ThroughputQueueMXBean {
+
+ public static final String NAME_TEMPLATE =
"org.apache.streams.local:type=ThroughputQueue,name=%s";
+
+ private static final Logger LOGGER =
LoggerFactory.getLogger(ThroughputQueue.class);
+
+ private BlockingQueue<ThroughputElement<E>> underlyingQueue;
+ private ReadWriteLock putCountsLock;
+ private ReadWriteLock takeCountsLock;
+ @GuardedBy("putCountsLock")
+ private long elementsAdded;
--- End diff --
It could be an Atomic along as every time its accessed is an atomic
operation. At the time of creation I did not think that was going to be case.
If you would like I can change it to make it an AtomicLong. But basically I
thought I would need more control over the locking than an Atomic allows, but
was incorrect.
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