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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 :: Examples :: DCI :: Marshal XStream</a> &gt; <a href="../index.html" class="el_bundle">it-tidalwave-role</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="fc bfc" id="L201" title="All 2 branches covered.">        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>
      }
  }
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