diff --git a/src/applications/almanac/servicetype/AlmanacServiceType.php b/src/applications/almanac/servicetype/AlmanacServiceType.php
--- a/src/applications/almanac/servicetype/AlmanacServiceType.php
+++ b/src/applications/almanac/servicetype/AlmanacServiceType.php
@@ -65,11 +65,11 @@
    * @return map<string, object> Dictionary of available service types.
    */
   public static function getAllServiceTypes() {
-    $types = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
-
-    return msort($types, 'getServiceTypeName');
+      ->setUniqueMethod('getServiceTypeShortName')
+      ->setSortMethod('getServiceTypeName')
+      ->execute();
   }
 
 
diff --git a/src/applications/auth/factor/PhabricatorAuthFactor.php b/src/applications/auth/factor/PhabricatorAuthFactor.php
--- a/src/applications/auth/factor/PhabricatorAuthFactor.php
+++ b/src/applications/auth/factor/PhabricatorAuthFactor.php
@@ -34,35 +34,10 @@
   }
 
   public static function getAllFactors() {
-    static $factors;
-
-    if ($factors === null) {
-      $map = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $factors = array();
-      foreach ($map as $factor) {
-        $key = $factor->getFactorKey();
-        if (empty($factors[$key])) {
-          $factors[$key] = $factor;
-        } else {
-          $this_class = get_class($factor);
-          $that_class = get_class($factors[$key]);
-
-          throw new Exception(
-            pht(
-              'Two auth factors (with classes "%s" and "%s") both provide '.
-              'implementations with the same key ("%s"). Each factor must '.
-              'have a unique key.',
-              $this_class,
-              $that_class,
-              $key));
-        }
-      }
-    }
-
-    return $factors;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getFactorKey')
+      ->execute();
   }
 
   protected function newConfigForUser(PhabricatorUser $user) {
diff --git a/src/applications/auth/provider/PhabricatorAuthProvider.php b/src/applications/auth/provider/PhabricatorAuthProvider.php
--- a/src/applications/auth/provider/PhabricatorAuthProvider.php
+++ b/src/applications/auth/provider/PhabricatorAuthProvider.php
@@ -55,16 +55,9 @@
   }
 
   public static function getAllBaseProviders() {
-    static $providers;
-
-    if ($providers === null) {
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-      $providers = $objects;
-    }
-
-    return $providers;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->execute();
   }
 
   public static function getAllProviders() {
diff --git a/src/applications/base/PhabricatorApplication.php b/src/applications/base/PhabricatorApplication.php
--- a/src/applications/base/PhabricatorApplication.php
+++ b/src/applications/base/PhabricatorApplication.php
@@ -383,13 +383,13 @@
     static $applications;
 
     if ($applications === null) {
-      $apps = id(new PhutilSymbolLoader())
+      $apps = id(new PhutilClassMapQuery())
         ->setAncestorClass(__CLASS__)
-        ->loadObjects();
+        ->setSortMethod('getApplicationOrder')
+        ->execute();
 
       // Reorder the applications into "application order". Notably, this
       // ensures their event handlers register in application order.
-      $apps = msort($apps, 'getApplicationOrder');
       $apps = mgroup($apps, 'getApplicationGroup');
 
       $group_order = array_keys(self::getApplicationGroups());
diff --git a/src/applications/celerity/postprocessor/CelerityPostprocessor.php b/src/applications/celerity/postprocessor/CelerityPostprocessor.php
--- a/src/applications/celerity/postprocessor/CelerityPostprocessor.php
+++ b/src/applications/celerity/postprocessor/CelerityPostprocessor.php
@@ -36,34 +36,10 @@
   }
 
   final public static function getAllPostprocessors() {
-    static $postprocessors;
-
-    if ($postprocessors === null) {
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = array();
-      foreach ($objects as $object) {
-        $key = $object->getPostprocessorKey();
-        if (empty($map[$key])) {
-          $map[$key] = $object;
-          continue;
-        }
-
-        throw new Exception(
-          pht(
-            'Two postprocessors (of classes "%s" and "%s") define the same '.
-            'postprocessor key ("%s"). Each postprocessor must define a '.
-            'unique key.',
-            get_class($object),
-            get_class($map[$key]),
-            $key));
-      }
-      $postprocessors = $map;
-    }
-
-    return $postprocessors;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getPostprocessorKey')
+      ->execute();
   }
 
 }
diff --git a/src/applications/celerity/resources/CelerityPhysicalResources.php b/src/applications/celerity/resources/CelerityPhysicalResources.php
--- a/src/applications/celerity/resources/CelerityPhysicalResources.php
+++ b/src/applications/celerity/resources/CelerityPhysicalResources.php
@@ -23,11 +23,10 @@
     static $resources_map;
 
     if ($resources_map === null) {
-      $resources_map = array();
-
-      $resources_list = id(new PhutilSymbolLoader())
+      $resources_list = id(new PhutilClassMapQuery())
         ->setAncestorClass(__CLASS__)
-        ->loadObjects();
+        ->setUniqueMethod('getName')
+        ->execute();
 
       foreach ($resources_list as $resources) {
         $name = $resources->getName();
@@ -39,21 +38,9 @@
               'lowercase latin letters and digits.',
               $name));
         }
-
-        if (empty($resources_map[$name])) {
-          $resources_map[$name] = $resources;
-        } else {
-          $old = get_class($resources_map[$name]);
-          $new = get_class($resources);
-          throw new Exception(
-            pht(
-              'Celerity resource maps must have unique names, but maps %s and '.
-              '%s share the same name, "%s".',
-              $old,
-              $new,
-              $name));
-        }
       }
+
+      $resources_map = $resources_list;
     }
 
     return $resources_map;
diff --git a/src/applications/config/check/PhabricatorSetupCheck.php b/src/applications/config/check/PhabricatorSetupCheck.php
--- a/src/applications/config/check/PhabricatorSetupCheck.php
+++ b/src/applications/config/check/PhabricatorSetupCheck.php
@@ -112,17 +112,10 @@
   }
 
   final public static function loadAllChecks() {
-    $symbols = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->setConcreteOnly(true)
-      ->selectAndLoadSymbols();
-
-    $checks = array();
-    foreach ($symbols as $symbol) {
-      $checks[] = newv($symbol['name'], array());
-    }
-
-    return msort($checks, 'getExecutionOrder');
+      ->setSortMethod('getExecutionOrder')
+      ->execute();
   }
 
   final public static function runAllChecks() {
diff --git a/src/applications/dashboard/paneltype/PhabricatorDashboardPanelType.php b/src/applications/dashboard/paneltype/PhabricatorDashboardPanelType.php
--- a/src/applications/dashboard/paneltype/PhabricatorDashboardPanelType.php
+++ b/src/applications/dashboard/paneltype/PhabricatorDashboardPanelType.php
@@ -46,36 +46,10 @@
   }
 
   public static function getAllPanelTypes() {
-    static $types;
-
-    if ($types === null) {
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = array();
-      foreach ($objects as $object) {
-        $key = $object->getPanelTypeKey();
-        if (!empty($map[$key])) {
-          $this_class = get_class($object);
-          $that_class = get_class($map[$key]);
-          throw new Exception(
-            pht(
-              'Two dashboard panels (of classes "%s" and "%s") have the '.
-              'same panel type key ("%s"). Each panel type must have a '.
-              'unique panel type key.',
-              $this_class,
-              $that_class,
-              $key));
-        }
-
-        $map[$key] = $object;
-      }
-
-      $types = $map;
-    }
-
-    return $types;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getPanelTypeKey')
+      ->execute();
   }
 
 }
diff --git a/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php b/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
--- a/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
+++ b/src/applications/drydock/blueprint/DrydockBlueprintImplementation.php
@@ -372,21 +372,9 @@
 
 
   public static function getAllBlueprintImplementations() {
-    static $list = null;
-
-    if ($list === null) {
-      $blueprints = id(new PhutilSymbolLoader())
-        ->setType('class')
-        ->setAncestorClass(__CLASS__)
-        ->setConcreteOnly(true)
-        ->selectAndLoadSymbols();
-      $list = ipull($blueprints, 'name', 'name');
-      foreach ($list as $class_name => $ignored) {
-        $list[$class_name] = newv($class_name, array());
-      }
-    }
-
-    return $list;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->execute();
   }
 
   public static function getAllBlueprintImplementationsForResource($type) {
diff --git a/src/applications/fact/engine/PhabricatorFactEngine.php b/src/applications/fact/engine/PhabricatorFactEngine.php
--- a/src/applications/fact/engine/PhabricatorFactEngine.php
+++ b/src/applications/fact/engine/PhabricatorFactEngine.php
@@ -3,17 +3,9 @@
 abstract class PhabricatorFactEngine extends Phobject {
 
   final public static function loadAllEngines() {
-    $classes = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->setConcreteOnly(true)
-      ->selectAndLoadSymbols();
-
-    $objects = array();
-    foreach ($classes as $class) {
-      $objects[] = newv($class['name'], array());
-    }
-
-    return $objects;
+      ->execute();
   }
 
   public function getFactSpecs(array $fact_types) {
diff --git a/src/applications/files/engine/PhabricatorFileStorageEngine.php b/src/applications/files/engine/PhabricatorFileStorageEngine.php
--- a/src/applications/files/engine/PhabricatorFileStorageEngine.php
+++ b/src/applications/files/engine/PhabricatorFileStorageEngine.php
@@ -224,36 +224,11 @@
    * @task load
    */
   public static function loadAllEngines() {
-    static $engines;
-
-    if ($engines === null) {
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = array();
-      foreach ($objects as $engine) {
-        $key = $engine->getEngineIdentifier();
-        if (empty($map[$key])) {
-          $map[$key] = $engine;
-        } else {
-          throw new Exception(
-            pht(
-              'Storage engines "%s" and "%s" have the same engine '.
-              'identifier "%s". Each storage engine must have a unique '.
-              'identifier.',
-              get_class($engine),
-              get_class($map[$key]),
-              $key));
-        }
-      }
-
-      $map = msort($map, 'getEnginePriority');
-
-      $engines = $map;
-    }
-
-    return $engines;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getEngineIdentifier')
+      ->setSortMethod('getEnginePriority')
+      ->execute();
   }
 
 
diff --git a/src/applications/files/transform/PhabricatorFileTransform.php b/src/applications/files/transform/PhabricatorFileTransform.php
--- a/src/applications/files/transform/PhabricatorFileTransform.php
+++ b/src/applications/files/transform/PhabricatorFileTransform.php
@@ -28,33 +28,11 @@
   }
 
   public static function getAllTransforms() {
-    static $map;
-
-    if ($map === null) {
-      $xforms = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $result = array();
-      foreach ($xforms as $xform_template) {
-        foreach ($xform_template->generateTransforms() as $xform) {
-          $key = $xform->getTransformKey();
-          if (isset($result[$key])) {
-            throw new Exception(
-              pht(
-                'Two %s objects define the same transform key ("%s"), but '.
-                'each transform must have a unique key.',
-                __CLASS__,
-                $key));
-          }
-          $result[$key] = $xform;
-        }
-      }
-
-      $map = $result;
-    }
-
-    return $map;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setExpandMethod('generateTransforms')
+      ->setUniqueMethod('getTransformKey')
+      ->execute();
   }
 
   public static function getTransformByKey($key) {
diff --git a/src/applications/harbormaster/autoplan/HarbormasterBuildAutoplan.php b/src/applications/harbormaster/autoplan/HarbormasterBuildAutoplan.php
--- a/src/applications/harbormaster/autoplan/HarbormasterBuildAutoplan.php
+++ b/src/applications/harbormaster/autoplan/HarbormasterBuildAutoplan.php
@@ -10,35 +10,10 @@
   }
 
   public static function getAllAutoplans() {
-    static $plans;
-
-    if ($plans === null) {
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = array();
-      foreach ($objects as $object) {
-        $key = $object->getAutoplanPlanKey();
-        if (!empty($map[$key])) {
-          $other = $map[$key];
-          throw new Exception(
-            pht(
-              'Two build autoplans (of classes "%s" and "%s") define the same '.
-              'key ("%s"). Each autoplan must have a unique key.',
-              get_class($other),
-              get_class($object),
-              $key));
-        }
-        $map[$key] = $object;
-      }
-
-      ksort($map);
-
-      $plans = $map;
-    }
-
-    return $plans;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getAutoplanPlanKey')
+      ->execute();
   }
 
 }
diff --git a/src/applications/harbormaster/step/HarbormasterBuildStepImplementation.php b/src/applications/harbormaster/step/HarbormasterBuildStepImplementation.php
--- a/src/applications/harbormaster/step/HarbormasterBuildStepImplementation.php
+++ b/src/applications/harbormaster/step/HarbormasterBuildStepImplementation.php
@@ -8,9 +8,9 @@
   private $settings;
 
   public static function getImplementations() {
-    return id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
+      ->execute();
   }
 
   public static function getImplementation($class) {
diff --git a/src/applications/herald/adapter/HeraldAdapter.php b/src/applications/herald/adapter/HeraldAdapter.php
--- a/src/applications/herald/adapter/HeraldAdapter.php
+++ b/src/applications/herald/adapter/HeraldAdapter.php
@@ -1023,14 +1023,11 @@
   }
 
   public static function getAllAdapters() {
-    static $adapters;
-    if (!$adapters) {
-      $adapters = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-      $adapters = msort($adapters, 'getAdapterSortKey');
-    }
-    return $adapters;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getAdapterContentType')
+      ->setSortMethod('getAdapterSortKey')
+      ->execute();
   }
 
   public static function getAdapterForContentType($content_type) {
diff --git a/src/applications/maniphest/export/ManiphestExcelFormat.php b/src/applications/maniphest/export/ManiphestExcelFormat.php
--- a/src/applications/maniphest/export/ManiphestExcelFormat.php
+++ b/src/applications/maniphest/export/ManiphestExcelFormat.php
@@ -3,19 +3,10 @@
 abstract class ManiphestExcelFormat extends Phobject {
 
   final public static function loadAllFormats() {
-    $classes = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->setConcreteOnly(true)
-      ->selectAndLoadSymbols();
-
-    $objects = array();
-    foreach ($classes as $class) {
-      $objects[$class['name']] = newv($class['name'], array());
-    }
-
-    $objects = msort($objects, 'getOrder');
-
-    return $objects;
+      ->setSortMethod('getOrder')
+      ->execute();
   }
 
   abstract public function getName();
diff --git a/src/applications/meta/panel/PhabricatorApplicationConfigurationPanel.php b/src/applications/meta/panel/PhabricatorApplicationConfigurationPanel.php
--- a/src/applications/meta/panel/PhabricatorApplicationConfigurationPanel.php
+++ b/src/applications/meta/panel/PhabricatorApplicationConfigurationPanel.php
@@ -47,27 +47,10 @@
     PhabricatorController $controller);
 
   public static function loadAllPanels() {
-    $objects = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
-
-    $panels = array();
-    foreach ($objects as $object) {
-      $key = $object->getPanelKey();
-      if (empty($panels[$key])) {
-        $panels[$key] = $object;
-      } else {
-        throw new Exception(
-          pht(
-            'Application configuration panels "%s" and "%s" have the same '.
-            'panel key, "%s". Each panel must have a unique key.',
-            get_class($object),
-            get_class($panels[$key]),
-            $key));
-      }
-    }
-
-    return $panels;
+      ->setUniqueMethod('getPanelKey')
+      ->execute();
   }
 
   public static function loadAllPanelsForApplication(
diff --git a/src/applications/metamta/command/MetaMTAEmailTransactionCommand.php b/src/applications/metamta/command/MetaMTAEmailTransactionCommand.php
--- a/src/applications/metamta/command/MetaMTAEmailTransactionCommand.php
+++ b/src/applications/metamta/command/MetaMTAEmailTransactionCommand.php
@@ -60,21 +60,11 @@
   }
 
   public static function getAllCommands() {
-    static $commands;
-
-    if ($commands === null) {
-      $kinds = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-      $commands = array();
-      foreach ($kinds as $kind) {
-        foreach ($kind->getCommandObjects() as $command) {
-          $commands[] = $command;
-        }
-      }
-    }
-
-    return $commands;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setExpandMethod('getCommandObjects')
+      ->setUniqueMethod('getCommand')
+      ->execute();
   }
 
   public static function getAllCommandsForObject(
diff --git a/src/applications/nuance/source/NuanceSourceDefinition.php b/src/applications/nuance/source/NuanceSourceDefinition.php
--- a/src/applications/nuance/source/NuanceSourceDefinition.php
+++ b/src/applications/nuance/source/NuanceSourceDefinition.php
@@ -58,31 +58,10 @@
   }
 
   public static function getAllDefinitions() {
-    static $definitions;
-
-    if ($definitions === null) {
-      $definitions = array();
-
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-      foreach ($objects as $definition) {
-        $key = $definition->getSourceTypeConstant();
-        $name = $definition->getName();
-        if (isset($definitions[$key])) {
-          $conflict = $definitions[$key];
-          throw new Exception(
-            pht(
-              'Definition %s conflicts with definition %s. This is a '.
-              'programming error.',
-              $conflict,
-              $name));
-        }
-        $definitions[$key] = $definition;
-      }
-    }
-
-    return $definitions;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getSourceTypeConstant')
+      ->execute();
   }
 
   /**
diff --git a/src/applications/passphrase/credentialtype/PassphraseCredentialType.php b/src/applications/passphrase/credentialtype/PassphraseCredentialType.php
--- a/src/applications/passphrase/credentialtype/PassphraseCredentialType.php
+++ b/src/applications/passphrase/credentialtype/PassphraseCredentialType.php
@@ -16,10 +16,10 @@
   }
 
   public static function getAllTypes() {
-    $types = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
-    return $types;
+      ->setUniqueMethod('getCredentialType')
+      ->execute();
   }
 
   public static function getAllCreateableTypes() {
diff --git a/src/applications/phid/type/PhabricatorPHIDType.php b/src/applications/phid/type/PhabricatorPHIDType.php
--- a/src/applications/phid/type/PhabricatorPHIDType.php
+++ b/src/applications/phid/type/PhabricatorPHIDType.php
@@ -159,37 +159,10 @@
    * @return dict<string, PhabricatorPHIDType> Map of type constants to types.
    */
   final public static function getAllTypes() {
-    static $types;
-    if ($types === null) {
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = array();
-      $original = array();
-      foreach ($objects as $object) {
-        $type = $object->getTypeConstant();
-        if (isset($map[$type])) {
-          $that_class = $original[$type];
-          $this_class = get_class($object);
-          throw new Exception(
-            pht(
-              "Two %s classes (%s, %s) both handle PHID type '%s'. ".
-              "A type may be handled by only one class.",
-              __CLASS__,
-              $that_class,
-              $this_class,
-              $type));
-        }
-
-        $original[$type] = get_class($object);
-        $map[$type] = $object;
-      }
-
-      $types = $map;
-    }
-
-    return $types;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getTypeConstant')
+      ->execute();
   }
 
 
diff --git a/src/applications/phortune/provider/PhortunePaymentProvider.php b/src/applications/phortune/provider/PhortunePaymentProvider.php
--- a/src/applications/phortune/provider/PhortunePaymentProvider.php
+++ b/src/applications/phortune/provider/PhortunePaymentProvider.php
@@ -117,9 +117,9 @@
 
 
   public static function getAllProviders() {
-    return id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
+      ->execute();
   }
 
   public function isEnabled() {
diff --git a/src/applications/policy/capability/PhabricatorPolicyCapability.php b/src/applications/policy/capability/PhabricatorPolicyCapability.php
--- a/src/applications/policy/capability/PhabricatorPolicyCapability.php
+++ b/src/applications/policy/capability/PhabricatorPolicyCapability.php
@@ -79,16 +79,10 @@
   }
 
   final public static function getCapabilityMap() {
-    static $map;
-    if ($map === null) {
-      $capabilities = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = mpull($capabilities, null, 'getCapabilityKey');
-    }
-
-    return $map;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getCapabilityKey')
+      ->execute();
   }
 
 }
diff --git a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
--- a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
+++ b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
@@ -559,11 +559,9 @@
    * @task construct
    */
   public static function getAllEngines() {
-    $engines = id(new PhutilSymbolLoader())
+    return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
-
-    return $engines;
+      ->execute();
   }
 
 
diff --git a/src/applications/search/engine/PhabricatorSearchEngine.php b/src/applications/search/engine/PhabricatorSearchEngine.php
--- a/src/applications/search/engine/PhabricatorSearchEngine.php
+++ b/src/applications/search/engine/PhabricatorSearchEngine.php
@@ -106,35 +106,11 @@
    * @task load
    */
   public static function loadAllEngines() {
-    static $engines;
-
-    if ($engines === null) {
-      $objects = id(new PhutilSymbolLoader())
-        ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = array();
-      foreach ($objects as $engine) {
-        $key = $engine->getEngineIdentifier();
-        if (empty($map[$key])) {
-          $map[$key] = $engine;
-        } else {
-          throw new Exception(
-            pht(
-              'Search engines "%s" and "%s" have the same engine identifier '.
-              '"%s". Each storage engine must have a unique identifier.',
-              get_class($engine),
-              get_class($map[$key]),
-              $key));
-        }
-      }
-
-      $map = msort($map, 'getEnginePriority');
-
-      $engines = $map;
-    }
-
-    return $engines;
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getEngineIdentifier')
+      ->setSortMethod('getEnginePriority')
+      ->execute();
   }
 
   /**
diff --git a/src/infrastructure/edges/type/PhabricatorEdgeType.php b/src/infrastructure/edges/type/PhabricatorEdgeType.php
--- a/src/infrastructure/edges/type/PhabricatorEdgeType.php
+++ b/src/infrastructure/edges/type/PhabricatorEdgeType.php
@@ -156,39 +156,22 @@
     static $type_map;
 
     if ($type_map === null) {
-      $types = id(new PhutilSymbolLoader())
+      $types = id(new PhutilClassMapQuery())
         ->setAncestorClass(__CLASS__)
-        ->loadObjects();
-
-      $map = array();
-
-      foreach ($types as $class => $type) {
-        $const = $type->getEdgeConstant();
-
-        if (isset($map[$const])) {
-          throw new Exception(
-            pht(
-              'Two edge types ("%s", "%s") share the same edge constant '.
-              '(%d). Each edge type must have a unique constant.',
-              $class,
-              get_class($map[$const]),
-              $const));
-        }
-
-        $map[$const] = $type;
-      }
+        ->setUniqueMethod('getEdgeConstant')
+        ->execute();
 
       // Check that all the inverse edge definitions actually make sense. If
       // edge type A says B is its inverse, B must exist and say that A is its
       // inverse.
 
-      foreach ($map as $const => $type) {
+      foreach ($types as $const => $type) {
         $inverse = $type->getInverseEdgeConstant();
         if ($inverse === null) {
           continue;
         }
 
-        if (empty($map[$inverse])) {
+        if (empty($types[$inverse])) {
           throw new Exception(
             pht(
               'Edge type "%s" ("%d") defines an inverse type ("%d") which '.
@@ -198,7 +181,7 @@
               $inverse));
         }
 
-        $inverse_inverse = $map[$inverse]->getInverseEdgeConstant();
+        $inverse_inverse = $types[$inverse]->getInverseEdgeConstant();
         if ($inverse_inverse !== $const) {
           throw new Exception(
             pht(
@@ -212,7 +195,7 @@
         }
       }
 
-      $type_map = $map;
+      $type_map = $types;
     }
 
     return $type_map;
diff --git a/src/infrastructure/util/password/PhabricatorPasswordHasher.php b/src/infrastructure/util/password/PhabricatorPasswordHasher.php
--- a/src/infrastructure/util/password/PhabricatorPasswordHasher.php
+++ b/src/infrastructure/util/password/PhabricatorPasswordHasher.php
@@ -212,11 +212,11 @@
    * @task hashing
    */
   public static function getAllHashers() {
-    $objects = id(new PhutilSymbolLoader())
+    $objects = id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
-      ->loadObjects();
+      ->setUniqueMethod('getHashName')
+      ->execute();
 
-    $map = array();
     foreach ($objects as $object) {
       $name = $object->getHashName();
 
@@ -233,20 +233,9 @@
             $maximum_length,
             $potential_length));
       }
-
-      if (isset($map[$name])) {
-        throw new Exception(
-          pht(
-            'Two hashers use the same hash name ("%s"), "%s" and "%s". Each '.
-            'hasher must have a unique name.',
-            $name,
-            get_class($object),
-            get_class($map[$name])));
-      }
-      $map[$name] = $object;
     }
 
-    return $map;
+    return $objects;
   }