Github user mfranklin commented on a diff in the pull request:
https://github.com/apache/incubator-streams/pull/99#discussion_r18621552
--- Diff:
streams-runtimes/streams-runtime-local/src/main/java/org/apache/streams/local/queues/ThroughputQueue.java
---
@@ -0,0 +1,377 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+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.atomic.AtomicLong;
+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 takeCountsLock;
+ private AtomicLong elementsAdded;
+ @GuardedBy("takeCountsLock")
+ private long elementsRemoved;
--- End diff --
glad to see the AtomicLong for added, couldn't elementsRemoved, and other
fields be atomic too?
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