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<?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>RoleManagerSupport.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 :: Roles</a> &gt; <a href="index.source.html" class="el_package">it.tidalwave.role.spi</a> &gt; <span class="el_source">RoleManagerSupport.java</span></div><h1>RoleManagerSupport.java</h1><pre class="source lang-java linenums">/*
 * *********************************************************************************************************************
 *
 * TheseFoolishThings: Miscellaneous utilities
 * http://tidalwave.it/projects/thesefoolishthings
 *
 * Copyright (C) 2009 - 2023 by Tidalwave s.a.s. (http://tidalwave.it)
 *
 * *********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the &quot;License&quot;); 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 &quot;AS IS&quot; 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/thesefoolishthings-src
 * git clone https://github.com/tidalwave-it/thesefoolishthings-src
 *
 * *********************************************************************************************************************
 */
package it.tidalwave.role.spi;

import java.lang.reflect.InvocationTargetException;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import it.tidalwave.util.NotFoundException;
import it.tidalwave.util.annotation.VisibleForTesting;
import it.tidalwave.role.ContextManager;
import it.tidalwave.role.spi.impl.DatumAndRole;
import it.tidalwave.role.spi.impl.MultiMap;
import lombok.extern.slf4j.Slf4j;
import static it.tidalwave.role.spi.impl.LogUtil.*;

/***********************************************************************************************************************
 *
 * A basic implementation of a {@link RoleManager}. This class must be specialized to:
 *
 * &lt;ol&gt;
 * &lt;li&gt;discover roles (see {@link #scan(java.util.Collection)}&lt;/li&gt;
 * &lt;li&gt;associate roles to a datum (see {@link #findDatumTypesForRole(java.lang.Class)}&lt;/li&gt;
 * &lt;li&gt;associate roles to contexts (see {@link #findContextTypeForRole(java.lang.Class)}&lt;/li&gt;
 * &lt;li&gt;eventually retrieve beans to inject in created roles (see {@link #getBean(java.lang.Class)}&lt;/li&gt;
 * &lt;/ol&gt;
 *
 * Specializations might use annotations or configuration files to accomplish these tasks.
 *
 * @author  Fabrizio Giudici
 *
 **********************************************************************************************************************/
<span class="fc" id="L65">@Slf4j</span>
<span class="fc" id="L66">public abstract class RoleManagerSupport implements RoleManager</span>
  {
<span class="fc" id="L68">    @VisibleForTesting final MultiMap&lt;DatumAndRole, Class&lt;?&gt;&gt; roleMapByDatumAndRole = new MultiMap&lt;&gt;();</span>

    // FIXME: use ConcurrentHashMap
use ConcurrentHashMap
<span class="fc" id="L71"> @VisibleForTesting final Set&lt;DatumAndRole&gt; alreadyScanned = new HashSet&lt;&gt;();</span> /******************************************************************************************************************* * * {@inheritDoc} * ******************************************************************************************************************/ @Override @Nonnull public synchronized &lt;T&gt; List&lt;T&gt; findRoles (@Nonnull final Object datum, @Nonnull final Class&lt;? extends T&gt; roleType) { <span class="fc" id="L81"> log.trace(&quot;findRoles({}, {})&quot;, shortId(datum), shortName(roleType));</span> <span class="fc" id="L82"> final Class&lt;?&gt; datumType = findTypeOf(datum);</span> <span class="fc" id="L83"> final List&lt;T&gt; roles = new ArrayList&lt;&gt;();</span> <span class="fc" id="L84"> final var roleImplementationTypes = findRoleImplementationsFor(datumType, roleType);</span> <span class="fc bfc" id="L86" title="All 2 branches covered."> outer: for (final var roleImplementationType : roleImplementationTypes)</span> { <span class="pc bpc" id="L88" title="1 of 2 branches missed."> for (final var constructor : roleImplementationType.getDeclaredConstructors())</span> { <span class="fc" id="L90"> log.trace(&quot;&gt;&gt;&gt;&gt; trying constructor {}&quot;, constructor);</span> <span class="fc" id="L91"> final var parameterTypes = constructor.getParameterTypes();</span> <span class="fc" id="L92"> Class&lt;?&gt; contextType = null;</span> <span class="fc" id="L93"> Object context = null;</span> try { <span class="fc" id="L97"> contextType = findContextTypeForRole(roleImplementationType);</span> // With DI frameworks such as Spring it's better to avoid eager initializations of references <span class="fc" id="L99"> final var contextManager = ContextManager.Locator.find();</span> <span class="fc" id="L100"> log.trace(&quot;&gt;&gt;&gt;&gt; contexts: {}&quot;, shortIds(contextManager.getContexts()));</span> try { <span class="fc" id="L104"> context = contextManager.findContextOfType(contextType);</span> } <span class="fc" id="L106"> catch (NotFoundException e)</span> { <span class="fc" id="L108"> log.trace(&quot;&gt;&gt;&gt;&gt; role {} discarded, can't find context: {}&quot;,</span> <span class="fc" id="L109"> shortName(roleImplementationType), shortName(contextType));</span> <span class="fc" id="L110"> continue outer;</span> <span class="fc" id="L111"> }</span> } <span class="fc" id="L113"> catch (NotFoundException e)</span> { // ok, no context <span class="fc" id="L116"> }</span> try { <span class="fc" id="L120"> final var params = getParameterValues(parameterTypes, datumType, datum, contextType, context);</span> <span class="fc" id="L121"> roles.add(roleType.cast(constructor.newInstance(params)));</span> <span class="fc" id="L122"> break;</span> } <span class="nc" id="L124"> catch (InstantiationException | IllegalAccessException</span> | IllegalArgumentException | InvocationTargetException e) { <span class="nc" id="L127"> log.error(&quot;Could not instantiate role of type &quot; + roleImplementationType, e);</span> } } <span class="fc" id="L130"> }</span> <span class="pc bpc" id="L132" title="1 of 2 branches missed."> if (log.isTraceEnabled())</span> { <span class="fc" id="L134"> log.trace(&quot;&gt;&gt;&gt;&gt; findRoles() returning: {}&quot;, shortIds(roles));</span> } <span class="fc" id="L137"> return roles;</span> } /******************************************************************************************************************* * * Prepare the constructor parameters out of the given expected types. Parameters will be eventually made of the * given datum, context, and other objects returned by {@link #getBean(java.lang.Class)}. * * @param parameterTypes the expected types * @param datumClass the type of the datum * @param datum the datum * @param contextClass the type of the context * @param context the context * ******************************************************************************************************************/ @Nonnull private Object[] getParameterValues (@Nonnull final Class&lt;?&gt;[] parameterTypes, @Nonnull final Class&lt;?&gt; datumClass, @Nonnull final Object datum, @Nullable final Class&lt;?&gt; contextClass, @Nullable final Object context) { <span class="fc" id="L159"> final List&lt;Object&gt; values = new ArrayList&lt;&gt;();</span> <span class="fc bfc" id="L161" title="All 2 branches covered."> for (final var parameterType : parameterTypes)</span> { <span class="fc bfc" id="L163" title="All 2 branches covered."> if (parameterType.isAssignableFrom(datumClass))</span> { <span class="fc" id="L165"> values.add(datum);</span> } <span class="fc bfc" id="L167" title="All 4 branches covered."> else if ((contextClass != null) &amp;&amp; parameterType.isAssignableFrom(contextClass))</span> { <span class="fc" id="L169"> values.add(context);</span> } else // generic injection { <span class="fc" id="L173"> values.add(getBean(parameterType));</span> } } <span class="fc" id="L177"> log.trace(&quot;&gt;&gt;&gt;&gt; constructor parameters: {}&quot;, values);</span> <span class="fc" id="L178"> return values.toArray();</span> } /******************************************************************************************************************* * * Finds the role implementations for the given owner type and role type. This method might discover new * implementations that weren't found during the initial scan, since the initial scan can't go down in a * hierarchy; that is, given a Base class or interface with some associated roles, it can't associate those roles * to subclasses (or implementations) of Base. Now we can navigate up the hierarchy and complete the picture. * Each new discovered role is added into the map, so the next time scanning will be faster. * * @param datumType the type of the datum * @param roleType the type of the role to find * @return the types of role implementations * ******************************************************************************************************************/ @Nonnull @VisibleForTesting synchronized &lt;T&gt; Set&lt;Class&lt;? extends T&gt;&gt; findRoleImplementationsFor ( @Nonnull final Class&lt;?&gt; datumType, @Nonnull final Class&lt;T&gt; roleType) { <span class="fc" id="L199"> final var datumAndRole = new DatumAndRole(datumType, roleType);</span> <span class="pc bpc" id="L201" title="1 of 2 branches missed."> if (!alreadyScanned.contains(datumAndRole))</span> { <span class="fc" id="L203"> alreadyScanned.add(datumAndRole);</span> <span class="fc" id="L204"> final var before = new HashSet&lt;&gt;(roleMapByDatumAndRole.getValues(datumAndRole));</span> <span class="fc bfc" id="L206" title="All 2 branches covered."> for (final var superDatumAndRole : datumAndRole.getSuper())</span> { <span class="fc" id="L208"> roleMapByDatumAndRole.addAll(datumAndRole, roleMapByDatumAndRole.getValues(superDatumAndRole));</span> <span class="fc" id="L209"> }</span> <span class="fc" id="L211"> final var after = new HashSet&lt;&gt;(roleMapByDatumAndRole.getValues(datumAndRole));</span> <span class="fc" id="L212"> logChanges(datumAndRole, before, after);</span> } <span class="fc" id="L215"> return (Set&lt;Class&lt;? extends T&gt;&gt;)(Set)roleMapByDatumAndRole.getValues(datumAndRole);</span> } /******************************************************************************************************************* * * Scans all the given role implementation classes and build a map of roles by owner class. * * @param roleImplementationTypes the types of role implementations to scan * ******************************************************************************************************************/ protected synchronized void scan (@Nonnull final Collection&lt;Class&lt;?&gt;&gt; roleImplementationTypes) { <span class="fc" id="L227"> log.debug(&quot;scan({})&quot;, shortNames(roleImplementationTypes));</span> <span class="fc bfc" id="L229" title="All 2 branches covered."> for (final var roleImplementationType : roleImplementationTypes)</span> { <span class="fc bfc" id="L231" title="All 2 branches covered."> for (final var datumType : findDatumTypesForRole(roleImplementationType))</span> { <span class="fc bfc" id="L233" title="All 2 branches covered."> for (final var roleType : findAllImplementedInterfacesOf(roleImplementationType))</span> { <span class="pc bpc" id="L235" title="1 of 2 branches missed."> if (!&quot;org.springframework.beans.factory.aspectj.ConfigurableObject&quot;.equals(roleType.getName()))</span> { <span class="fc" id="L237"> roleMapByDatumAndRole.add(new DatumAndRole(datumType, roleType), roleImplementationType);</span> } <span class="fc" id="L239"> }</span> } <span class="fc" id="L241"> }</span> <span class="fc" id="L243"> logRoles();</span> <span class="fc" id="L244"> }</span> /******************************************************************************************************************* * * Finds all the interfaces implemented by a given class, including those eventually implemented by superclasses * and interfaces that are indirectly implemented (e.g. C implements I1, I1 extends I2). * * @param clazz the class to inspect * @return the implemented interfaces * ******************************************************************************************************************/ @Nonnull @VisibleForTesting static SortedSet&lt;Class&lt;?&gt;&gt; findAllImplementedInterfacesOf (@Nonnull final Class&lt;?&gt; clazz) { <span class="fc" id="L258"> final SortedSet&lt;Class&lt;?&gt;&gt; interfaces = new TreeSet&lt;&gt;(Comparator.comparing(Class::getName));</span> <span class="fc" id="L259"> interfaces.addAll(List.of(clazz.getInterfaces()));</span> <span class="fc bfc" id="L261" title="All 2 branches covered."> for (final var interface_ : interfaces)</span> { <span class="fc" id="L263"> interfaces.addAll(findAllImplementedInterfacesOf(interface_));</span> <span class="fc" id="L264"> }</span> <span class="fc bfc" id="L266" title="All 2 branches covered."> if (clazz.getSuperclass() != null)</span> { <span class="fc" id="L268"> interfaces.addAll(findAllImplementedInterfacesOf(clazz.getSuperclass()));</span> } <span class="fc" id="L271"> return interfaces;</span> } /******************************************************************************************************************* * * Retrieves an extra bean. * * @param &lt;T&gt; the static type of the bean * @param beanType the dynamic type of the bean * @return the bean * ******************************************************************************************************************/ @Nullable protected abstract &lt;T&gt; T getBean (@Nonnull Class&lt;T&gt; beanType); /******************************************************************************************************************* * * Returns the type of the context associated to the given role implementation type. * * @param roleImplementationType the role type * @return the context type * @throws NotFoundException if no context is found * ******************************************************************************************************************/ @Nonnull protected abstract Class&lt;?&gt; findContextTypeForRole (@Nonnull Class&lt;?&gt; roleImplementationType) throws NotFoundException; /******************************************************************************************************************* * * Returns the valid datum types for the given role implementation type. * * @param roleImplementationType the role type * @return the datum types * ******************************************************************************************************************/ @Nonnull protected abstract Class&lt;?&gt;[] findDatumTypesForRole (@Nonnull Class&lt;?&gt; roleImplementationType); /******************************************************************************************************************* * * ******************************************************************************************************************/ private void logChanges (@Nonnull final DatumAndRole datumAndRole, @Nonnull final Set&lt;Class&lt;?&gt;&gt; before, @Nonnull final Set&lt;Class&lt;?&gt;&gt; after) { <span class="fc" id="L318"> after.removeAll(before);</span> <span class="fc bfc" id="L320" title="All 2 branches covered."> if (!after.isEmpty())</span> { <span class="fc" id="L322"> log.debug(&quot;&gt;&gt;&gt;&gt;&gt;&gt;&gt; added implementations: {} -&gt; {}&quot;, datumAndRole, shortNames(after));</span> <span class="pc bpc" id="L324" title="1 of 2 branches missed."> if (log.isTraceEnabled()) // yes, trace</span> { <span class="fc" id="L326"> logRoles();</span> } } <span class="fc" id="L329"> }</span> /******************************************************************************************************************* * * ******************************************************************************************************************/ public void logRoles() { <span class="fc" id="L337"> log.debug(&quot;Configured roles:&quot;);</span> <span class="fc" id="L339"> final List&lt;Entry&lt;DatumAndRole, Set&lt;Class&lt;?&gt;&gt;&gt;&gt; entries = new ArrayList&lt;&gt;(roleMapByDatumAndRole.entrySet());</span> <span class="fc" id="L340"> entries.sort(Comparator.comparing((Entry&lt;DatumAndRole, Set&lt;Class&lt;?&gt;&gt;&gt; e) -&gt; e.getKey()</span> <span class="fc" id="L341"> .getDatumClass()</span> <span class="fc" id="L342"> .getName())</span> <span class="fc" id="L343"> .thenComparing(e -&gt; e.getKey().getRoleClass().getName()));</span> <span class="fc bfc" id="L345" title="All 2 branches covered."> for (final var entry : entries)</span> { <span class="fc" id="L347"> log.debug(&quot;&gt;&gt;&gt;&gt; {}: {} -&gt; {}&quot;,</span> <span class="fc" id="L348"> shortName(entry.getKey().getDatumClass()),</span> <span class="fc" id="L349"> shortName(entry.getKey().getRoleClass()),</span> <span class="fc" id="L350"> shortNames(entry.getValue()));</span> <span class="fc" id="L351"> }</span> <span class="fc" id="L352"> }</span> /******************************************************************************************************************* * * Returns the type of an object, taking care of mocks created by Mockito, for which the implemented interface is * returned. * * @param object the object * @return the object type * ******************************************************************************************************************/ @Nonnull @VisibleForTesting static &lt;T&gt; Class&lt;T&gt; findTypeOf (@Nonnull final T object) { <span class="fc" id="L366"> var ownerClass = object.getClass();</span> <span class="fc bfc" id="L368" title="All 2 branches covered."> if (ownerClass.toString().contains(&quot;MockitoMock&quot;))</span> { <span class="fc" id="L370"> ownerClass = ownerClass.getInterfaces()[0]; // 1st is the original class, 2nd is CGLIB proxy</span> <span class="pc bpc" id="L372" title="1 of 2 branches missed."> if (log.isTraceEnabled())</span> { <span class="fc" id="L374"> log.trace(&quot;&gt;&gt;&gt;&gt; owner is a mock {} implementing {}&quot;,</span> <span class="fc" id="L375"> shortName(ownerClass), shortNames(List.of(ownerClass.getInterfaces())));</span> <span class="fc" id="L376"> log.trace(&quot;&gt;&gt;&gt;&gt; owner class replaced with {}&quot;, shortName(ownerClass));</span> } } <span class="fc" id="L380"> return (Class&lt;T&gt;)ownerClass;</span> } } </pre><div class="footer"><span class="right">Created with <a href="http://www.jacoco.org/jacoco">JaCoCo</a> 0.8.7.202105040129</span></div></body></html>