Content of file MultiQueue.java.html
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/><link rel="stylesheet" href="../../jacoco-resources/report.css" type="text/css"/><link rel="shortcut icon" href="../../jacoco-resources/report.gif" type="image/gif"/><title>MultiQueue.java</title><link rel="stylesheet" href="../../jacoco-resources/prettify.css" type="text/css"/><script type="text/javascript" src="../../jacoco-resources/prettify.js"></script></head><body onload="window['PR_TAB_WIDTH']=4;prettyPrint()"><div class="breadcrumb" id="breadcrumb"><span class="info"><a href="../../jacoco-sessions.html" class="el_session">Sessions</a></span><a href="../../index.html" class="el_report">TheseFoolishThings - Actors</a> > <a href="../index.html" class="el_bundle">it-tidalwave-messagebus</a> > <a href="index.source.html" class="el_package">it.tidalwave.messagebus.spi</a> > <span class="el_source">MultiQueue.java</span></div><h1>MultiQueue.java</h1><pre class="source lang-java linenums">/*
* #%L
* %%
* %%
* #L%
*/
package it.tidalwave.messagebus.spi;
import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.NavigableSet;
import java.util.Queue;
import java.util.concurrent.ConcurrentNavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.LinkedBlockingQueue;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import lombok.ToString;
import lombok.extern.slf4j.Slf4j;
/***********************************************************************************************************************
*
* @author Fabrizio Giudici
*
**********************************************************************************************************************/
<span class="nc" id="L30">@Slf4j</span>
<span class="nc" id="L31">public class MultiQueue </span>
{
<span class="nc bnc" id="L33" title="All 4 branches missed."> @RequiredArgsConstructor @Getter @ToString</span>
static class TopicAndMessage<TOPIC>
{
@Nonnull
<span class="nc" id="L37"> private final Class<TOPIC> topic;</span>
@Nonnull
<span class="nc" id="L39"> private final TOPIC message;</span>
}
<span class="nc" id="L42"> private final ConcurrentNavigableMap<Class<?>, Queue<?>> queueMapByTopic =</span>
<span class="nc" id="L43"> new ConcurrentSkipListMap<>(Comparator.comparing(Class::getName));</span>
<span class="nc" id="L45"> private Class<?> latestSentTopic = null;</span>
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
public synchronized <TOPIC> void add (@Nonnull final Class<TOPIC> topic, @Nonnull final TOPIC message)
{
<span class="nc" id="L53"> getQueue(topic).add(message);</span>
<span class="nc" id="L54"> notifyAll();</span>
<span class="nc" id="L55"> }</span>
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
@Nonnull
public synchronized <TOPIC> TopicAndMessage<TOPIC> remove()
throws InterruptedException
{
for (;;)
{
<span class="nc bnc" id="L67" title="All 2 branches missed."> for (final Class<?> topic : reorderedTopics())</span>
{
<span class="nc" id="L69"> final Queue<?> queue = queueMapByTopic.get(topic);</span>
<span class="nc" id="L70"> final Object message = queue.poll();</span>
<span class="nc bnc" id="L72" title="All 2 branches missed."> if (message != null)</span>
{
<span class="nc" id="L74"> latestSentTopic = topic;</span>
<span class="nc bnc" id="L76" title="All 2 branches missed."> if (log.isTraceEnabled())</span>
{
<span class="nc" id="L78"> log.trace("stats {}", stats());</span>
}
<span class="nc" id="L81"> return new TopicAndMessage<>((Class<TOPIC>)topic, (TOPIC)message); </span>
}
<span class="nc" id="L83"> }</span>
<span class="nc bnc" id="L85" title="All 2 branches missed."> if (log.isTraceEnabled())</span>
{
<span class="nc" id="L87"> log.trace("all queues empty; stats {}", stats());</span>
}
<span class="nc" id="L90"> wait(); </span>
}
}
/*******************************************************************************************************************
*
* Returns the list of topics reordered, so it starts just after latestSentTopic and wraps around.
*
******************************************************************************************************************/
@Nonnull
private List<Class<?>> reorderedTopics()
{
<span class="nc" id="L102"> final NavigableSet<Class<?>> keySet = queueMapByTopic.navigableKeySet();</span>
<span class="nc" id="L103"> final List<Class<?>> scanSet = new ArrayList<>();</span>
<span class="nc bnc" id="L105" title="All 2 branches missed."> if (latestSentTopic == null)</span>
{
<span class="nc" id="L107"> scanSet.addAll(keySet);</span>
}
else
{
<span class="nc" id="L111"> scanSet.addAll(keySet.subSet(latestSentTopic, false, keySet.last(), true));</span>
<span class="nc" id="L112"> scanSet.addAll(keySet.subSet(keySet.first(), true, latestSentTopic, true));</span>
}
<span class="nc" id="L115"> return scanSet;</span>
}
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
private synchronized String stats()
{
<span class="nc" id="L124"> final StringBuilder b = new StringBuilder();</span>
<span class="nc" id="L125"> String separator = "";</span>
<span class="nc bnc" id="L127" title="All 2 branches missed."> for (final Map.Entry<Class<?>, Queue<?>> e : queueMapByTopic.entrySet())</span>
{
<span class="nc" id="L129"> b.append(separator).append(String.format("%s[%s]: %d", </span>
<span class="nc bnc" id="L130" title="All 2 branches missed."> e.getKey().getSimpleName(), e.getKey().equals(latestSentTopic) ? "X" : " ", e.getValue().size()));</span>
<span class="nc" id="L131"> separator = ", ";</span>
<span class="nc" id="L132"> }</span>
<span class="nc" id="L134"> return b.toString();</span>
}
/*******************************************************************************************************************
*
* Returns the queue associated to a given topic. The queue is created if the topic is new.
*
* @param topic the topic
* @return the queue
*
******************************************************************************************************************/
@Nonnull
private synchronized <TOPIC> Queue<TOPIC> getQueue (@Nonnull final Class<TOPIC> topic)
{
// TODO Java 8 would make this easier
| Java 8 would make this easier | |
<span class="nc" id="L149"> Queue<TOPIC> queue = (Queue<TOPIC>)queueMapByTopic.get(topic);</span>
<span class="nc bnc" id="L151" title="All 2 branches missed."> if (queue == null)</span>
{
<span class="nc" id="L153"> queue = new LinkedBlockingQueue<>();</span>
<span class="nc" id="L154"> queueMapByTopic.put(topic, queue);</span>
}
<span class="nc" id="L157"> return queue;</span>
}
}
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