Changes 10: New MemoryContentStorageHandler

src/Content/ContentStorageHandler.php

@@ -6,6 +6,7 @@
 use Kirby\Cms\Language;
 use Kirby\Cms\ModelWithContent;
 use Kirby\Cms\Page;
+use Kirby\Exception\NotFoundException;
 
 /**
  * Abstract for content storage handlers;
@@ -52,7 +53,10 @@ public function all(): Generator
 	 *
 	 * @param array<string, string> $fields Content fields
 	 */
-	abstract public function create(VersionId $versionId, Language $language, array $fields): void;
+	public function create(VersionId $versionId, Language $language, array $fields): void
+	{
+		$this->write($versionId, $language, $fields);
+	}
 
 	/**
 	 * Deletes an existing version in an idempotent way if it was already deleted
@@ -91,6 +95,26 @@ public function dynamicVersions(): array
 		return $versions;
 	}
 
+	/**
+	 * Checks if a version/language combination exists and otherwise
+	 * will throw a NotFoundException
+	 *
+	 * @throws \Kirby\Exception\NotFoundException If the version does not exist
+	 */
+	public function ensure(VersionId $versionId, Language $language): void
+	{
+		if ($this->exists($versionId, $language) === true) {
+			return;
+		}
+
+		$message = match($this->model->kirby()->multilang()) {
+			true  => 'Version "' . $versionId . ' (' . $language->code() . ')" does not already exist',
+			false => 'Version "' . $versionId . '" does not already exist',
+		};
+
+		throw new NotFoundException($message);
+	}
+
 	/**
 	 * Checks if a version exists
 	 */
@@ -104,12 +128,21 @@ abstract public function modified(VersionId $versionId, Language $language): int
 	/**
 	 * Moves content from one version-language combination to another
 	 */
-	abstract public function move(
+	public function move(
 		VersionId $fromVersionId,
 		Language $fromLanguage,
 		VersionId $toVersionId,
 		Language $toLanguage
-	): void;
+	): void {
+		// read the existing fields
+		$fields = $this->read($fromVersionId, $fromLanguage);
+
+		// create the new version
+		$this->create($toVersionId, $toLanguage, $fields);
+
+		// clean up the old version
+		$this->delete($fromVersionId, $fromLanguage);
+	}
 
 	/**
 	 * Adapts all versions when converting languages
@@ -158,7 +191,20 @@ public function touchLanguage(Language $language): void
 	 *
 	 * @param array<string, string> $fields Content fields
 	 *
-	 * @throws \Kirby\Exception\NotFoundException If the version does not exist
+	 * @throws \Kirby\Exception\Exception If the file cannot be written
+	 */
+	public function update(VersionId $versionId, Language $language, array $fields): void
+	{
+		$this->ensure($versionId, $language);
+		$this->write($versionId, $language, $fields);
+	}
+
+	/**
+	 * Writes the content fields of an existing version
+	 *
+	 * @param array<string, string> $fields Content fields
+	 *
+	 * @throws \Kirby\Exception\Exception If the content cannot be written
 	 */
-	abstract public function update(VersionId $versionId, Language $language, array $fields): void;
+	abstract protected function write(VersionId $versionId, Language $language, array $fields): void;
 }

src/Content/MemoryContentStorageHandler.php

@@ -0,0 +1,130 @@
+<?php
+
+namespace Kirby\Content;
+
+use Kirby\Cache\MemoryCache;
+use Kirby\Cms\Language;
+use Kirby\Cms\ModelWithContent;
+
+/**
+ * @package   Kirby Content
+ * @author    Bastian Allgeier <[email protected]>
+ * @link      https://getkirby.com
+ * @copyright Bastian Allgeier
+ * @license   https://getkirby.com/license
+ */
+class MemoryContentStorageHandler extends ContentStorageHandler
+{
+	/**
+	 * Cache instance, used to store content in memory
+	 */
+	protected MemoryCache $cache;
+
+	/**
+	 * Sets up the cache instance
+	 */
+	public function __construct(protected ModelWithContent $model)
+	{
+		parent::__construct($model);
+		$this->cache = new MemoryCache();
+	}
+
+	/**
+	 * Returns a unique id for a combination
+	 * of the version id, the language code and the model id
+	 */
+	protected function cacheId(VersionId $versionId, Language $language): string
+	{
+		return $versionId->value() . '/' . $language->code() . '/' . $this->model->id();
+	}
+
+	/**
+	 * Deletes an existing version in an idempotent way if it was already deleted
+	 */
+	public function delete(VersionId $versionId, Language $language): void
+	{
+		$this->cache->remove($this->cacheId($versionId, $language));
+	}
+
+	/**
+	 * Checks if a version exists
+	 */
+	public function exists(VersionId $versionId, Language $language): bool
+	{
+		$data = $this->cache->get($this->cacheId($versionId, $language));
+
+		// validate the cached data
+		if (
+			isset($data['fields']) === true &&
+			is_array($data['fields']) === true &&
+			isset($data['modified']) === true &&
+			is_int($data['modified']) === true
+		) {
+			return true;
+		}
+
+		return false;
+	}
+
+	/**
+	 * Returns the modification timestamp of a version if it exists
+	 */
+	public function modified(VersionId $versionId, Language $language): int|null
+	{
+		if ($this->exists($versionId, $language) === false) {
+			return null;
+		}
+
+		return $this->cache->get($this->cacheId($versionId, $language))['modified'];
+	}
+
+	/**
+	 * Returns the stored content fields
+	 *
+	 * @return array<string, string>
+	 *
+	 * @throws \Kirby\Exception\NotFoundException If the version does not exist
+	 */
+	public function read(VersionId $versionId, Language $language): array
+	{
+		$this->ensure($versionId, $language);
+		return $this->cache->get($this->cacheId($versionId, $language))['fields'];
+	}
+
+	/**
+	 * Updates the modification timestamp of an existing version
+	 *
+	 * @throws \Kirby\Exception\NotFoundException If the version does not exist
+	 */
+	public function touch(VersionId $versionId, Language $language): void
+	{
+		$fields = $this->read($versionId, $language);
+		$this->write($versionId, $language, $fields);
+	}
+
+	/**
+	 * Updates the content fields of an existing version
+	 *
+	 * @param array<string, string> $fields Content fields
+	 *
+	 * @throws \Kirby\Exception\NotFoundException If the version does not exist
+	 */
+	public function update(VersionId $versionId, Language $language, array $fields): void
+	{
+		$this->ensure($versionId, $language);
+		$this->write($versionId, $language, $fields);
+	}
+
+	/**
+	 * Writes the content fields of an existing version
+	 *
+	 * @param array<string, string> $fields Content fields
+	 */
+	protected function write(VersionId $versionId, Language $language, array $fields): void
+	{
+		$this->cache->set($this->cacheId($versionId, $language), [
+			'fields'   => $fields,
+			'modified' => time()
+		]);
+	}
+}

src/Content/PlainTextContentStorageHandler.php

@@ -141,18 +141,6 @@ public function contentFiles(VersionId $versionId): array
 		];
 	}
 
-	/**
-	 * Creates a new version
-	 *
-	 * @param array<string, string> $fields Content fields
-	 *
-	 * @throws \Kirby\Exception\Exception If the file cannot be written
-	 */
-	public function create(VersionId $versionId, Language $language, array $fields): void
-	{
-		$this->write($versionId, $language, $fields);
-	}
-
 	/**
 	 * Deletes an existing version in an idempotent way if it was already deleted
 	 */
@@ -247,18 +235,6 @@ public function touch(VersionId $versionId, Language $language): void
 		// @codeCoverageIgnoreEnd
 	}
 
-	/**
-	 * Updates the content fields of an existing version
-	 *
-	 * @param array<string, string> $fields Content fields
-	 *
-	 * @throws \Kirby\Exception\Exception If the file cannot be written
-	 */
-	public function update(VersionId $versionId, Language $language, array $fields): void
-	{
-		$this->write($versionId, $language, $fields);
-	}
-
 	/**
 	 * Writes the content fields of an existing version
 	 *

src/Content/Version.php

@@ -5,7 +5,6 @@
 use Kirby\Cms\Language;
 use Kirby\Cms\ModelWithContent;
 use Kirby\Exception\InvalidArgumentException;
-use Kirby\Exception\NotFoundException;
 
 /**
  * The Version class handles all actions for a single
@@ -88,16 +87,7 @@ public function delete(): void
 	public function ensure(
 		Language|string $language = 'default'
 	): void {
-		if ($this->exists($language) === true) {
-			return;
-		}
-
-		$message = match($this->model->kirby()->multilang()) {
-			true  => 'Version "' . $this->id . ' (' . $language . ')" does not already exist',
-			false => 'Version "' . $this->id . '" does not already exist',
-		};
-
-		throw new NotFoundException($message);
+		$this->model->storage()->ensure($this->id, $this->language($language));
 	}
 
 	/**