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From rbnks <...@git.apache.org>
Subject [GitHub] incubator-streams pull request: Streams 190
Date Thu, 09 Oct 2014 20:40:24 GMT
Github user rbnks commented on a diff in the pull request:

    https://github.com/apache/incubator-streams/pull/99#discussion_r18672624
  
    --- 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 --
    
    Yes, but they get accessed at the same time a lot of the time, so instead of acquiring
three locks, I tried to simplify it under on lock.  I can change this if the have Atomics
is preferred. 


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