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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>SystemRoleFactorySupport.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 :: Examples :: Finder :: In-memory Finder</a> &gt; <a href="../index.html" class="el_bundle">it-tidalwave-util</a> &gt; <a href="index.source.html" class="el_package">it.tidalwave.role.spi</a> &gt; <span class="el_source">SystemRoleFactorySupport.java</span></div><h1>SystemRoleFactorySupport.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 java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import it.tidalwave.util.ContextManager;
import it.tidalwave.util.annotation.VisibleForTesting;
import it.tidalwave.role.impl.OwnerAndRole;
import it.tidalwave.role.impl.MultiMap;
import it.tidalwave.dci.annotation.DciRole;
import lombok.extern.slf4j.Slf4j;
import static java.util.Comparator.*;
import static it.tidalwave.util.ShortNames.*;

/***********************************************************************************************************************
 *
 * A basic implementation of a {@link SystemRoleFactory}. 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="L66">@Slf4j</span>
<span class="fc" id="L67">public abstract class SystemRoleFactorySupport implements SystemRoleFactory</span>
  {
<span class="fc" id="L69">    @VisibleForTesting final MultiMap&lt;OwnerAndRole, Class&lt;?&gt;&gt; roleMapByOwnerAndRole = new MultiMap&lt;&gt;();</span>

    // FIXME: use ConcurrentHashMap
<span class="fc" id="L72">    @VisibleForTesting final Set&lt;OwnerAndRole&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="L82">        log.trace(&quot;findRoles({}, {})&quot;, shortId(datum), shortName(roleType));</span>
<span class="fc" id="L83">        final Class&lt;?&gt; datumType = findTypeOf(datum);</span>
<span class="fc" id="L84">        final List&lt;T&gt; roles = new ArrayList&lt;&gt;();</span>
<span class="fc" id="L85">        final var roleImplementationTypes = findRoleImplementationsFor(datumType, roleType);</span>

<span class="fc bfc" id="L87" title="All 2 branches covered.">        outer:  for (final var roleImplementationType : roleImplementationTypes)</span>
          {
<span class="pc bpc" id="L89" title="1 of 2 branches missed.">            for (final var constructor : roleImplementationType.getDeclaredConstructors())</span>
              {
<span class="fc" id="L91">                log.trace(&quot;&gt;&gt;&gt;&gt; trying constructor {}&quot;, constructor);</span>
<span class="fc" id="L92">                final var parameterTypes = constructor.getParameterTypes();</span>
<span class="fc" id="L93">                Optional&lt;?&gt; context = Optional.empty();</span>
<span class="fc" id="L94">                final var contextType = findContextTypeForRole(roleImplementationType);</span>

<span class="fc bfc" id="L96" title="All 2 branches covered.">                if (contextType.isPresent())</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.getInstance();</span>
<span class="fc" id="L100">                    log.trace(&quot;&gt;&gt;&gt;&gt; contexts: {}&quot;, shortIds(contextManager.getContexts()));</span>
<span class="fc" id="L101">                    context = contextManager.findContextOfType(contextType.get());</span>

<span class="fc bfc" id="L103" title="All 2 branches covered.">                    if (context.isEmpty())</span>
                      {
<span class="fc" id="L105">                        log.trace(&quot;&gt;&gt;&gt;&gt; role {} discarded, can't find context: {}&quot;,</span>
<span class="fc" id="L106">                                  shortName(roleImplementationType), shortName(contextType.get()));</span>
<span class="fc" id="L107">                        continue outer;</span>
                      }
                  }

                try
                  {
<span class="fc" id="L113">                    final var params = getParameterValues(parameterTypes, datumType, datum, contextType, context);</span>
<span class="fc" id="L114">                    roles.add(roleType.cast(constructor.newInstance(params)));</span>
<span class="fc" id="L115">                    break;</span>
                  }
<span class="nc" id="L117">                catch (InstantiationException | IllegalAccessException</span>
                        | IllegalArgumentException | InvocationTargetException e)
                  {
<span class="nc" id="L120">                    log.error(&quot;Could not instantiate role of type &quot; + roleImplementationType, e);</span>
                  }
              }
<span class="fc" id="L123">          }</span>

<span class="pc bpc" id="L125" title="1 of 2 branches missed.">        if (log.isTraceEnabled())</span>
          {
<span class="nc" id="L127">            log.trace(&quot;&gt;&gt;&gt;&gt; findRoles() returning: {}&quot;, shortIds(roles));</span>
          }

<span class="fc" id="L130">        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,
                                         @Nonnull final Optional&lt;Class&lt;?&gt;&gt; contextClass,
                                         @Nonnull final Optional&lt;?&gt; context)
      {
<span class="fc" id="L152">        final var values = new ArrayList&lt;&gt;();</span>

<span class="fc bfc" id="L154" title="All 2 branches covered.">        for (final var parameterType : parameterTypes)</span>
          {
<span class="fc bfc" id="L156" title="All 2 branches covered.">            if (parameterType.isAssignableFrom(datumClass))</span>
              {
<span class="fc" id="L158">                values.add(datum);</span>
              }
<span class="fc bfc" id="L160" title="All 4 branches covered.">            else if (contextClass.isPresent() &amp;&amp; parameterType.isAssignableFrom(contextClass.get()))</span>
              {
<span class="fc" id="L162">                values.add(context.orElse(null));</span>
              }
            else // generic injection
              {
                // FIXME: it's injecting null, but perhaps should it throw exception?

it's injecting null, but perhaps should it throw exception?
<span class="fc" id="L167">                values.add(getBean(parameterType).orElse(null));</span>
              }
          }

<span class="fc" id="L171">        log.trace(&quot;&gt;&gt;&gt;&gt; constructor parameters: {}&quot;, values);</span>
<span class="fc" id="L172">        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="L193">        final var datumAndRole = new OwnerAndRole(datumType, roleType);</span>

<span class="pc bpc" id="L195" title="1 of 2 branches missed.">        if (!alreadyScanned.contains(datumAndRole))</span>
          {
<span class="fc" id="L197">            alreadyScanned.add(datumAndRole);</span>
<span class="fc" id="L198">            final var before = new HashSet&lt;&gt;(roleMapByOwnerAndRole.getValues(datumAndRole));</span>

<span class="fc bfc" id="L200" title="All 2 branches covered.">            for (final var superDatumAndRole : datumAndRole.getSuper())</span>
              {
<span class="fc" id="L202">                roleMapByOwnerAndRole.addAll(datumAndRole, roleMapByOwnerAndRole.getValues(superDatumAndRole));</span>
<span class="fc" id="L203">              }</span>

<span class="fc" id="L205">            final var after = new HashSet&lt;&gt;(roleMapByOwnerAndRole.getValues(datumAndRole));</span>
<span class="fc" id="L206">            logChanges(datumAndRole, before, after);</span>
          }

<span class="fc" id="L209">        return (Set&lt;Class&lt;? extends T&gt;&gt;)(Set)roleMapByOwnerAndRole.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="L221">        log.debug(&quot;scan({})&quot;, shortNames(roleImplementationTypes));</span>

<span class="fc bfc" id="L223" title="All 2 branches covered.">        for (final var roleImplementationType : roleImplementationTypes)</span>
          {
<span class="fc bfc" id="L225" title="All 2 branches covered.">            for (final var datumType : findDatumTypesForRole(roleImplementationType))</span>
              {
<span class="fc bfc" id="L227" title="All 2 branches covered.">                for (final var roleType : findAllImplementedInterfacesOf(roleImplementationType))</span>
                  {
<span class="pc bpc" id="L229" title="1 of 2 branches missed.">                    if (!&quot;org.springframework.beans.factory.aspectj.ConfigurableObject&quot;.equals(roleType.getName()))</span>
                      {
<span class="fc" id="L231">                        roleMapByOwnerAndRole.add(new OwnerAndRole(datumType, roleType), roleImplementationType);</span>
                      }
<span class="fc" id="L233">                  }</span>
              }
<span class="fc" id="L235">          }</span>

<span class="fc" id="L237">        logRoles();</span>
<span class="fc" id="L238">      }</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="L252">        final SortedSet&lt;Class&lt;?&gt;&gt; interfaces = new TreeSet&lt;&gt;(comparing(Class::getName));</span>
<span class="fc" id="L253">        interfaces.addAll(List.of(clazz.getInterfaces()));</span>

<span class="fc bfc" id="L255" title="All 2 branches covered.">        for (final var interface_ : interfaces)</span>
          {
<span class="fc" id="L257">            interfaces.addAll(findAllImplementedInterfacesOf(interface_));</span>
<span class="fc" id="L258">          }</span>

<span class="fc bfc" id="L260" title="All 2 branches covered.">        if (clazz.getSuperclass() != null)</span>
          {
<span class="fc" id="L262">            interfaces.addAll(findAllImplementedInterfacesOf(clazz.getSuperclass()));</span>
          }

<span class="fc" id="L265">        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
     *
     ******************************************************************************************************************/
    @Nonnull
    protected &lt;T&gt; Optional&lt;T&gt; getBean (@Nonnull final Class&lt;T&gt; beanType)
      {
<span class="nc" id="L280">        return Optional.empty();</span>
      }

    /*******************************************************************************************************************
     *
     * Returns the type of the context associated to the given role implementation type.
     *
     * @param   roleImplementationType      the role type
     * @return                              the context type
     *
     ******************************************************************************************************************/
    @Nonnull
    protected Optional&lt;Class&lt;?&gt;&gt; findContextTypeForRole (@Nonnull final Class&lt;?&gt; roleImplementationType)
      {
<span class="nc" id="L294">        final var contextClass = roleImplementationType.getAnnotation(DciRole.class).context();</span>
<span class="nc bnc" id="L295" title="All 2 branches missed.">        return (contextClass == DciRole.NoContext.class) ? Optional.empty() : Optional.of(contextClass);</span>
      }

    /*******************************************************************************************************************
     *
     * Returns the valid datum types for the given role implementation type.
     *
     * @param   roleImplementationType      the role type
     * @return                              the datum types
     *
     ******************************************************************************************************************/
    @Nonnull
    protected Class&lt;?&gt;[] findDatumTypesForRole (@Nonnull final Class&lt;?&gt; roleImplementationType)
      {
<span class="nc" id="L309">        return roleImplementationType.getAnnotation(DciRole.class).datumType();</span>
      }

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    private void logChanges (@Nonnull final OwnerAndRole ownerAndRole,
                             @Nonnull final Set&lt;Class&lt;?&gt;&gt; before,
                             @Nonnull final Set&lt;Class&lt;?&gt;&gt; after)
      {
<span class="fc" id="L320">        after.removeAll(before);</span>

<span class="fc bfc" id="L322" title="All 2 branches covered.">        if (!after.isEmpty())</span>
          {
<span class="fc" id="L324">            log.debug(&quot;&gt;&gt;&gt;&gt;&gt;&gt;&gt; added implementations: {} -&gt; {}&quot;, ownerAndRole, shortNames(after));</span>

<span class="pc bpc" id="L326" title="1 of 2 branches missed.">            if (log.isTraceEnabled()) // yes, trace</span>
              {
<span class="nc" id="L328">                logRoles();</span>
              }
          }
<span class="fc" id="L331">      }</span>

    /*******************************************************************************************************************
     *
     *
     ******************************************************************************************************************/
    public void logRoles()
      {
<span class="fc" id="L339">        log.debug(&quot;Configured roles:&quot;);</span>

<span class="fc" id="L341">        final var entries = new ArrayList&lt;&gt;(roleMapByOwnerAndRole.entrySet());</span>
<span class="fc" id="L342">        entries.sort(comparing((Map.Entry&lt;OwnerAndRole, Set&lt;Class&lt;?&gt;&gt;&gt; e) -&gt; e.getKey().getOwnerClass().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().getOwnerClass()),</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="nc" id="L374">                log.trace(&quot;&gt;&gt;&gt;&gt; owner is a mock {} implementing {}&quot;,</span>
<span class="nc" id="L375">                          shortName(ownerClass), shortNames(List.of(ownerClass.getInterfaces())));</span>
<span class="nc" 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>
      }
  }
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