Add benchmarks to test empty codec overhead

Author: alcaeus

benchmark/Fixtures/PassThruCodec.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace MongoDB\Benchmark\Fixtures;
+
+use MongoDB\BSON\Document;
+use MongoDB\Codec\DecodeIfSupported;
+use MongoDB\Codec\DocumentCodec;
+use MongoDB\Codec\EncodeIfSupported;
+use MongoDB\Exception\UnsupportedValueException;
+
+final class PassThruCodec implements DocumentCodec
+{
+    use DecodeIfSupported;
+    use EncodeIfSupported;
+
+    /** @param mixed $value */
+    public function canDecode($value): bool
+    {
+        return $value instanceof Document;
+    }
+
+    /** @param mixed $value */
+    public function canEncode($value): bool
+    {
+        return $value instanceof Document;
+    }
+
+    /** @param mixed $value */
+    public function decode($value): Document
+    {
+        if (! $value instanceof Document) {
+            throw UnsupportedValueException::invalidDecodableValue($value);
+        }
+
+        return $value;
+    }
+
+    /** @param mixed $value */
+    public function encode($value): Document
+    {
+        if (! $value instanceof Document) {
+            throw UnsupportedValueException::invalidEncodableValue($value);
+        }
+
+        return $value;
+    }
+}

benchmark/Fixtures/ToObjectCodec.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace MongoDB\Benchmark\Fixtures;
+
+use MongoDB\BSON\Document;
+use MongoDB\Codec\DecodeIfSupported;
+use MongoDB\Codec\DocumentCodec;
+use MongoDB\Codec\EncodeIfSupported;
+use MongoDB\Exception\UnsupportedValueException;
+
+use function is_object;
+
+final class ToObjectCodec implements DocumentCodec
+{
+    use DecodeIfSupported;
+    use EncodeIfSupported;
+
+    /** @param mixed $value */
+    public function canDecode($value): bool
+    {
+        return $value instanceof Document;
+    }
+
+    /** @param mixed $value */
+    public function canEncode($value): bool
+    {
+        return is_object($value);
+    }
+
+    /** @param mixed $value */
+    public function decode($value): object
+    {
+        if (! $value instanceof Document) {
+            throw UnsupportedValueException::invalidDecodableValue($value);
+        }
+
+        return $value->toPHP(['root' => 'stdClass', 'array' => 'array', 'document' => 'stdClass']);
+    }
+
+    /** @param mixed $value */
+    public function encode($value): Document
+    {
+        if (! is_object($value)) {
+            throw UnsupportedValueException::invalidEncodableValue($value);
+        }
+
+        return Document::fromPHP($value);
+    }
+}

benchmark/ReadLargeDocumentBench.php

@@ -3,6 +3,8 @@
 namespace MongoDB\Benchmark;
 
 use Generator;
+use MongoDB\Benchmark\Fixtures\PassThruCodec;
+use MongoDB\Benchmark\Fixtures\ToObjectCodec;
 use MongoDB\BSON\Document;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Model\BSONArray;
@@ -40,7 +42,7 @@ public function provideParams(): Generator
     {
         yield 'Driver default typemap' => [
             'codec' => null,
-            'typeMap' => [],
+            'typeMap' => null,
             'accessor' => 'object',
         ];
 
@@ -65,6 +67,18 @@ public function provideParams(): Generator
             'typeMap' => ['root' => 'bson'],
             'accessor' => 'bson',
         ];
+
+        yield 'Codec (pass thru)' => [
+            'codec' => new PassThruCodec(),
+            'typeMap' => null,
+            'accessor' => 'bson',
+        ];
+
+        yield 'Codec (to object)' => [
+            'codec' => new ToObjectCodec(),
+            'typeMap' => null,
+            'accessor' => 'object',
+        ];
     }
 
     #[ParamProviders('provideParams')]

benchmark/ReadMultipleDocumentsBench.php

@@ -3,6 +3,8 @@
 namespace MongoDB\Benchmark;
 
 use Generator;
+use MongoDB\Benchmark\Fixtures\PassThruCodec;
+use MongoDB\Benchmark\Fixtures\ToObjectCodec;
 use MongoDB\BSON\Document;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Model\BSONArray;
@@ -65,6 +67,18 @@ public function provideParams(): Generator
             'typeMap' => ['root' => 'bson'],
             'accessor' => 'bson',
         ];
+
+        yield 'Codec (pass thru)' => [
+            'codec' => new PassThruCodec(),
+            'typeMap' => null,
+            'accessor' => 'bson',
+        ];
+
+        yield 'Codec (to object)' => [
+            'codec' => new ToObjectCodec(),
+            'typeMap' => null,
+            'accessor' => 'object',
+        ];
     }
 
     #[ParamProviders('provideParams')]