<?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>DefaultCacheManager.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">blueMarine II :: Media Scanner</a> > <a href="../index.html" class="el_bundle">it-tidalwave-bluemarine2-model</a> > <a href="index.source.html" class="el_package">it.tidalwave.bluemarine2.model.impl</a> > <span class="el_source">DefaultCacheManager.java</span></div><h1>DefaultCacheManager.java</h1><pre class="source lang-java linenums"><span class="nc" id="L1">/*</span>
* *********************************************************************************************************************
*
* blueMarine II: Semantic Media Centre
* http://tidalwave.it/projects/bluemarine2
*
* Copyright (C) 2015 - 2021 by Tidalwave s.a.s. (http://tidalwave.it)
*
* *********************************************************************************************************************
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* 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.
*
* *********************************************************************************************************************
*
* git clone https://bitbucket.org/tidalwave/bluemarine2-src
* git clone https://github.com/tidalwave-it/bluemarine2-src
*
* *********************************************************************************************************************
*/
package it.tidalwave.bluemarine2.model.impl;
import javax.annotation.Nonnull;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;
import java.lang.ref.SoftReference;
import it.tidalwave.messagebus.annotation.ListensTo;
import it.tidalwave.messagebus.annotation.SimpleMessageSubscriber;
import it.tidalwave.bluemarine2.model.spi.CacheManager;
import it.tidalwave.bluemarine2.message.PersistenceInitializedNotification;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import static java.util.Objects.requireNonNull;
/***********************************************************************************************************************
*
* @author Fabrizio Giudici
*
**********************************************************************************************************************/
<span class="nc" id="L47">@Slf4j @SimpleMessageSubscriber</span>
<span class="nc" id="L48">public class DefaultCacheManager implements CacheManager</span>
{
<span class="nc" id="L50"> private final Map<Object, Cache> cacheMap = new ConcurrentHashMap<>();</span>
<span class="nc" id="L52"> @RequiredArgsConstructor</span>
static class DefaultCache implements Cache
{
@Nonnull
private final String name;
// TODO: use Spring ConcurrentReferenceHashMap?
use Spring ConcurrentReferenceHashMap?
<span class="nc" id="L58"> private final Map<Object, SoftReference<?>> objectMap = new ConcurrentHashMap<>();</span>
@Override @Nonnull
public <T> T getCachedObject (@Nonnull final Object key, @Nonnull final Supplier<T> supplier)
{
<span class="nc" id="L63"> SoftReference<T> ref = (SoftReference<T>)(objectMap.computeIfAbsent(key, k -> computeObject(k, supplier)));</span>
<span class="nc" id="L64"> T object = ref.get();</span>
<span class="nc bnc" id="L66" title="All 2 branches missed."> if (object == null)</span>
{
<span class="nc" id="L68"> objectMap.put(key, ref = computeObject(key, supplier));</span>
<span class="nc" id="L69"> object = requireNonNull(ref.get(), "Cache returned null");</span>
}
<span class="nc" id="L72"> return object;</span>
}
@Nonnull
private <T> SoftReference<T> computeObject (@Nonnull final Object key, @Nonnull final Supplier<T> supplier)
{
<span class="nc" id="L78"> log.info(">>>> cache {} miss for {}", name, key);</span>
<span class="nc" id="L79"> return new SoftReference<>(requireNonNull(supplier.get(), "Supplier returned null"));</span>
}
}
@Override @Nonnull
public Cache getCache (@Nonnull final Object cacheKey)
{
<span class="nc" id="L86"> return cacheMap.computeIfAbsent(cacheKey, key -> new DefaultCache(cacheKey.toString()));</span>
}
/* visible for testing FIXME */ public void onPersistenceUpdated (@ListensTo final PersistenceInitializedNotification notification)
{
<span class="nc" id="L91"> log.debug("onPersistenceUpdated({})", notification);</span>
<span class="nc" id="L92"> cacheMap.clear();</span>
<span class="nc" id="L93"> }</span>
}
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