Improved cache reading

.gitignore

@@ -6,3 +6,5 @@ cache
 .local
 *.phar
 .composer
+.phpunit*
+.bash_history

CloudObjects/SDK/CloudObject.php

@@ -19,7 +19,8 @@ class CloudObject {
 
     private $coid;
     private $node;
-    private $reader;
+    private $reader = null;
+    private $retriever = null;
 
     public function __construct(IRI $coid, Node $node) {
         Assert::eq((string)$coid, $node->getId(), "COID and Node ID must match.");
@@ -32,17 +33,33 @@ class CloudObject {
      * Specify a custom NodeReader to use for this CloudObject.
      * If not set, a default NodeReader will be used.
      */
-    public function setReader(NodeReader $reader) {
+    public function setReader(NodeReader $reader) : self {
         $this->reader = $reader;
+
+        return $this;
     }
 
-    private function getReader() {
+    /**
+     * Get the NodeReader used for this CloudObject.
+     * Returns a default NodeReader if non has been set.
+     */
+    protected function getReader() : NodeReader {
         if (!$this->reader) {
             $this->reader = new NodeReader;
         }
         return $this->reader;
     }
 
+    /**
+     * Specify an ObjectRetriever to use for retrieval
+     * of related objects.
+     */
+    public function setObjectRetriever(ObjectRetriever $retriever) : self {
+        $this->retriever = $retriever;
+
+        return $this;
+    }
+
     /**
      * Get the COID of this object.
      */
@@ -51,12 +68,19 @@ class CloudObject {
     }
 
     /**
-     * Get the raw object node.
+     * Get the object node encapsulated in this CloudObject.
      */
-    public function getObjectNode() : Node {
+    public function getAsNode() : Node {
         return $this->node;
     }
 
+    /**
+     * Checks if a property exists on this object.
+     */
+    public function has($property) : bool {
+        return $this->getReader()->hasProperty($this->node, $property);
+    }
+
     /**
      * Get the value of a property as a string.
      * If the property has multiple values, only the first is returned.
@@ -105,4 +129,41 @@ class CloudObject {
         return $this->getReader()->getFirstValueNode($this->node, $property, $default);
     }
 
+    /**
+     * Get the value of a property and, if it's a COID, retrieve the corresponding CloudObject.
+     */
+    public function getCloudObject($property) : ?CloudObject {
+        Assert::notNull($this->retriever, "No ObjectRetriever set for CloudObject. Cannot retrieve related object.");
+
+        $coid = $this->getReader()->getFirstValueIRI($this->node, $property);
+
+        if (!($coid instanceof IRI)) {
+            return null;
+        }
+
+        return $this->retriever->getCloudObject($coid);
+    }
+
+    /**
+     * Get the value of a property and, if it's a COID, retrieve the corresponding object node.
+     */
+    public function getObjectNode($property) : ?Node {
+        Assert::notNull($this->retriever, "No ObjectRetriever set for CloudObject. Cannot retrieve related object.");
+
+        $coid = $this->getReader()->getFirstValueIRI($this->node, $property);
+
+        if (!($coid instanceof IRI)) {
+            return null;
+        }
+
+        return $this->retriever->getObjectNode($coid);
+    }
+    
+    /**
+     * Get the revision of the object.
+     */
+    public function getRevision() : string {
+        return $this->getString(Constants::PROPERTY_REVISION);
+    }
+
 }

CloudObjects/SDK/Common/CryptoHelper.php

@@ -59,7 +59,7 @@ class CryptoHelper {
 
         $this->objectRetriever = $objectRetriever;
         $this->namespace = isset($namespaceCoid)
-            ? $objectRetriever->getObject($namespaceCoid)
+            ? $objectRetriever->getObjectNode($namespaceCoid)
             : $objectRetriever->getAuthenticatingNamespaceObject();
         
         $this->reader = new NodeReader([

CloudObjects/SDK/Constants.php

@@ -0,0 +1,13 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ 
+namespace CloudObjects\SDK;
+
+class Constants {
+
+    const PROPERTY_REVISION = 'coid://cloudobjects.io/isAtRevision';
+
+}

CloudObjects/SDK/Exceptions/InvalidSDKConfigurationException.php

@@ -0,0 +1,14 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ 
+namespace CloudObjects\SDK\Exceptions;
+
+/**
+ * An Exception that is thrown when the SDK's configuration isn't valid.
+ */
+class InvalidSDKConfigurationException extends \Exception {
+
+}

CloudObjects/SDK/Helpers/SharedSecretAuthentication.php

@@ -50,7 +50,7 @@ class SharedSecretAuthentication {
             return self::RESULT_INVALID_PASSWORD;
 
         // Retrieve namespace
-        $namespace = $retriever->getObject($namespaceCoid);
+        $namespace = $retriever->getObjectNode($namespaceCoid);
         if (!isset($namespace))
             return self::RESULT_NAMESPACE_NOT_FOUND;
 
@@ -87,7 +87,7 @@ class SharedSecretAuthentication {
             return self::RESULT_INVALID_PASSWORD;
 
         // Retrieve namespace
-        $namespace = $this->objectRetriever->getObject($namespaceCoid);
+        $namespace = $this->objectRetriever->getObjectNode($namespaceCoid);
         if (!isset($namespace))
             return self::RESULT_NAMESPACE_NOT_FOUND;
 

CloudObjects/SDK/JSON/SchemaValidator.php

@@ -68,7 +68,7 @@ class SchemaValidator {
      * @param Node $node The COID of the specification.
      */
     public function validateAgainstCOID($data, IRI $coid) {
-        $object = $this->objectRetriever->getObject($coid);
+        $object = $this->objectRetriever->getObjectNode($coid);
         Assert::true($this->reader->hasType($object, 'json:Element'),
             "You can only validate data against JSON elements!");
         $this->validateAgainstNode($data, $object);

CloudObjects/SDK/ObjectRetriever.php

@@ -6,15 +6,23 @@
  
 namespace CloudObjects\SDK;
 
-use Exception;
+use DateTime, Exception;
 use ML\IRI\IRI, ML\JsonLD\JsonLD;
-use Doctrine\Common\Cache\RedisCache;
 use Psr\Log\LoggerInterface, Psr\Log\LoggerAwareTrait;
 use GuzzleHttp\ClientInterface, GuzzleHttp\Client, GuzzleHttp\HandlerStack;
 use GuzzleHttp\Exception\RequestException;
-use Kevinrob\GuzzleCache\CacheMiddleware, Kevinrob\GuzzleCache\Storage\DoctrineCacheStorage;
+use GuzzleHttp\Psr7\Request,
+	GuzzleHttp\Psr7\Response;
+use Kevinrob\GuzzleCache\CacheMiddleware;
 use Kevinrob\GuzzleCache\Strategy\PrivateCacheStrategy;
-use CloudObjects\SDK\Exceptions\CoreAPIException;
+use Kevinrob\GuzzleCache\Storage\CacheStorageInterface,
+	Kevinrob\GuzzleCache\Storage\Psr6CacheStorage,
+	Kevinrob\GuzzleCache\Storage\Psr16CacheStorage,
+	Kevinrob\GuzzleCache\CacheEntry;
+use Psr\Cache\CacheItemPoolInterface;
+use Psr\SimpleCache\CacheInterface;
+use CloudObjects\SDK\Exceptions\CoreAPIException,
+	CloudObjects\SDK\Exceptions\InvalidSDKConfigurationException;
 use CloudObjects\SDK\AccountGateway\AccountContext;
 
 /**
@@ -29,15 +37,15 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 	private $options;
 	private $cache;
 	private $objects;
+	private $defaultReader;
+	private $customCacheDefaultRequest;
 
-	const CO_API_URL = 'https://api.cloudobjects.net/';
+	const CO_API_URL = 'https://od.coid.link/';
-	
-	const REVISION_PROPERTY = 'coid://cloudobjects.io/isAtRevision';
 		
 	public function __construct($options = []) {
 		// Merge options with defaults
 		$this->options = array_merge([
-			'cache_provider' => 'none',
+			'cache_storage' => null,
 			'cache_prefix' => 'clobj:',
 			'cache_ttl' => 60,
 			'static_config_path' => null,
@@ -49,35 +57,27 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 			'connect_timeout' => 5
 		], $options);
 
-		// Set up object cache
+		// Check object cache configuration
-		switch ($this->options['cache_provider']) {
+		if (isset($this->options['cache_storage'])
-			case 'none':
+				&& !($this->options['cache_storage'] instanceof CacheStorageInterface)
-				// no caching
+				&& !($this->options['cache_storage'] instanceof CacheItemPoolInterface)
-				$this->cache = null;
+				&& !($this->options['cache_storage'] instanceof CacheInterface)
-				break;
+			) {
-			case 'redis':
+			throw new InvalidSDKConfigurationException('Invalid cache_storage specified; must be an instance of Kevinrob\GuzzleCache\CacheStorageInterface, Psr\Cache\CacheItemPoolInterface or Psr\SimpleCache\CacheInterface.');
-				// caching with Redis
+		}
-				$redis = new \Redis();
-				$redis->pconnect(
-						isset($this->options['cache_provider.redis.host']) ? $this->options['cache_provider.redis.host'] : '127.0.0.1',
-						isset($this->options['cache_provider.redis.port']) ? $this->options['cache_provider.redis.port'] : 6379);
 
-				$this->cache = new RedisCache();
+		if ($this->options['cache_storage'] instanceof CacheStorageInterface) {
-				$this->cache->setRedis($redis);
+			$this->cache = $this->options['cache_storage'];
-				break;
+		} elseif ($this->options['cache_storage'] instanceof CacheItemPoolInterface) {
-			case 'file':
+			$this->cache = new Psr6CacheStorage($this->options['cache_storage']);
-				// caching on the filesystem
+		} elseif ($this->options['cache_storage'] instanceof CacheInterface) {
-				$this->cache = new \Doctrine\Common\Cache\FilesystemCache(
+			$this->cache = new Psr16CacheStorage($this->options['cache_storage']);
-					isset($this->options['cache_provider.file.directory']) ? $this->options['cache_provider.file.directory'] : sys_get_temp_dir()
-				);
-				break;
-			default:
-				throw new Exception('Valid values for cache_provider are: none, redis, file');
 		}
 
 		// Set up logger
-		if (is_a($this->options['logger'], LoggerInterface::class))
+		if (is_a($this->options['logger'], LoggerInterface::class)) {
 			$this->setLogger($this->options['logger']);
+		}
 
 		// Set up handler stack
 		$stack = HandlerStack::create();
@@ -86,11 +86,14 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 		if (isset($this->cache)) {
 			$stack->push(
 				new CacheMiddleware(
-					new PrivateCacheStrategy(
+					new PrivateCacheStrategy($this->cache)
-						new DoctrineCacheStorage($this->cache)
-					)
 				)
 			);
+
+			// We also use the cache for storing object descriptions and attachments
+			// without the HTTP request, so we create a dummy request; this way
+			// we can reuse GuzzleCache for maximum compatibility
+			$this->customCacheDefaultRequest = new Request('GET', '/');
 		}		
 
 		// Initialize client
@@ -107,23 +110,53 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 		$this->client = new Client($options);
 	}
 
+	/**
+	 * Set a default reader for CloudObject instances.
+	 */
+	public function setDefaultReader(NodeReader $reader) : self {
+		$this->defaultReader = $reader;
+
+		return $this;
+	}
+
+	/**
+	 * Get the default reader for CloudObject instances.
+	 */
+	public function getDefaultReader() : NodeReader {
+		return $this->defaultReader;
+	}
+
 	public function logInfoWithTime($message, $ts) {
 		if (isset($this->logger))
 			$this->logger->info($message, [ 'elapsed_ms' => round((microtime(true) - $ts) * 1000) ]);
 	}
 
-	private function getCacheKey($id) {
+	public function getCacheKey($id) {
 		return $this->options['cache_prefix'] . $this->options['auth_ns'] . '/' . $id;		
 	}
 
 	private function getFromCache($id) {
-		return (isset($this->cache) && $this->cache->contains($this->getCacheKey($id)))
+		if (!$this->cache) {
-			? $this->cache->fetch($this->getCacheKey($id)) : null;
+			return null;
+		}
+		
+		$cachedData = $this->cache->fetch($this->getCacheKey($id));
+
+		if (!$cachedData) {
+			return null;
+		}
+
+		return (string)$cachedData->getResponse()->getBody(true);
 	}
 
 	private function putIntoCache($id, $data, $ttl) {
-		if (isset($this->cache))
+		if ($this->cache) {
-			$this->cache->save($this->getCacheKey($id), $data, $ttl);
+			$entry = new CacheEntry($this->customCacheDefaultRequest,
+				new Response(200, [], $data),
+				((new DateTime)->modify('+'.$ttl.' seconds')));
+
+			$this->cache->save($this->getCacheKey($id), $entry, $ttl);
+		}
 	}
 
 	public function getFromCacheCustom($id) {
@@ -179,7 +212,15 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 			return null;
 		}
 
-		return new CloudObject($coid, $node);
+		$object = (new CloudObject($coid, $node))
+			->setObjectRetriever($this);
+
+		if ($this->defaultReader) {
+			// Initialize CloudObject with default reader if it is set
+			$object->setReader($this->defaultReader);
+		}
+
+		return $object;
 	}
 
 	/**
@@ -454,7 +495,7 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 		}
 
 		if (!isset($fileData)
-				|| $fileRevision!=$object->getProperty(self::REVISION_PROPERTY)->getValue()) {
+				|| $fileRevision !== $object->getProperty(Constants::PROPERTY_REVISION)->getValue()) {
 
 			// Does not exist in cache or is outdated, fetch from CloudObjects
 			try {
@@ -462,7 +503,7 @@ class ObjectRetriever implements CustomCacheAndLogInterface {
 					.'/'.basename($filename));
 
 				$fileContent = $response->getBody()->getContents();
-				$fileData = $object->getProperty(self::REVISION_PROPERTY)->getValue().'#'.$fileContent;
+				$fileData = $object->getProperty(Constants::PROPERTY_REVISION)->getValue().'#'.$fileContent;
 				$this->putIntoCache($cacheId, $fileData, 0);
 
 				$this->logInfoWithTime('Fetched attachment <'.$filename.'> for <'.$object->getId().'> from Core API ['.$response->getStatusCode().'].', $ts);

CloudObjects/SDK/TestHelpers/InMemoryLogger.php

@@ -0,0 +1,63 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace CloudObjects\SDK\TestHelpers;
+
+use Psr\Log\LoggerInterface;
+
+class InMemoryLogger implements LoggerInterface {
+
+    private $logs = [];
+
+    public function getLogs() : array {
+        return $this->logs;
+    }
+
+    public function getLastLogMessage() : string {
+        if (empty($this->logs)) {
+            return '';
+        }
+
+        return end($this->logs)['message'];
+    }
+
+    public function emergency(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'emergency', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function alert(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'alert', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function critical(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'critical', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function error(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'error', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function warning(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'warning', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function notice(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'notice', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function info(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'info', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function debug(string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => 'debug', 'message' => (string)$message, 'context' => $context ];
+    }
+
+    public function log($level, string|\Stringable $message, array $context = []): void {
+        $this->logs[] = [ 'level' => $level, 'message' => (string)$message, 'context' => $context ];
+    }
+
+}

CloudObjects/SDK/WebAPI/APIClientFactory.php

@@ -157,7 +157,7 @@ class APIClientFactory {
         if ($this->reader->hasProperty($api, 'oauth2:hasAuthorizationServer')) {
             // We have an authorization server for this endpoint/API
             $authServerCoid = $this->reader->getFirstValueIRI($api, 'oauth2:hasAuthorizationServer');
-            $authServerObject = $this->objectRetriever->getObject($authServerCoid);
+            $authServerObject = $this->objectRetriever->getObjectNode($authServerCoid);
             if (!isset($authServerObject))
                 throw new InvalidObjectConfigurationException("Authorization server object <"
                     . (string)$authServerCoid . "> not available.");
@@ -220,7 +220,7 @@ class APIClientFactory {
     public function __construct(ObjectRetriever $objectRetriever, IRI $namespaceCoid = null) {
         $this->objectRetriever = $objectRetriever;
         $this->namespace = isset($namespaceCoid)
-            ? $objectRetriever->getObject($namespaceCoid)
+            ? $objectRetriever->getObjectNode($namespaceCoid)
             : $objectRetriever->getAuthenticatingNamespaceObject();
         
         $this->reader = new NodeReader([
@@ -242,7 +242,7 @@ class APIClientFactory {
     public function getClientWithCOID(IRI $apiCoid, bool $specificClient = false) {
         $idString = (string)$apiCoid.(string)$specificClient;
         if (!isset($this->apiClients[$idString])) {
-            $object = $this->objectRetriever->getObject($apiCoid);
+            $object = $this->objectRetriever->getObjectNode($apiCoid);
             if (!isset($object))
                 throw new CoreAPIException("Could not retrieve API <".(string)$apiCoid.">.");
             $this->apiClients[$idString] = $this->createClient($object, $specificClient);

README.md

@@ -2,66 +2,17 @@
 
 [![Latest Stable Version](https://poser.pugx.org/cloudobjects/sdk/v/stable)](https://packagist.org/packages/cloudobjects/sdk) [![Total Downloads](https://poser.pugx.org/cloudobjects/sdk/downloads)](https://packagist.org/packages/cloudobjects/sdk)
 
-[![buddy branch](https://app.buddy.works/cloudobjects/php-sdk/repository/branch/main/badge.svg?token=52ae28bf71dbbd3dde018f3f3e7caafa04f95bdb451b3dfca547414ec7a01739 "buddy branch")](https://app.buddy.works/cloudobjects/php-sdk/repository/branch/main)
+[![buddy pipeline](https://app.buddy.works/cloudobjects/cloudobjects-php-sdk/pipelines/pipeline/561203/badge.svg?token=40c63ec4ea9e432a9edc8ebfb0ba0e203f70a02a8208339b119ff16772f4abd4 "buddy pipeline")](https://app.buddy.works/cloudobjects/cloudobjects-php-sdk/pipelines/pipeline/561203)
-
-The CloudObjects PHP SDK provides simple access to [CloudObjects](https://cloudobjects.io/) from PHP-based applications. It wraps the [Object API](https://coid.link/cloudobjects.io/ObjectAPI/1.0) to fetch objects from the CloudObjects Core database and provides object-based access to their RDF description. A two-tiered caching mechanism (in-memory and Doctrine cache drivers) is included. The SDK also contains a helper class to validate COIDs.
 
 ## Installation
 
-The SDK is [distributed through packagist](https://packagist.org/packages/cloudobjects/sdk). Add `cloudobjects/sdk` to the `require` section of your `composer.json`, like this:
+The SDK is [distributed through packagist](https://packagist.org/packages/cloudobjects/sdk).
 
-````json
+Install with the following command:
-{
-  "require": {
-    "cloudobjects/sdk" : ">=0.7"
-  }
-}
-````
 
-## Retrieving Objects
+```
-
+composer require cloudobjects/sdk
-In order to retrieve objects from the CloudObjects Core database you need to create an instance of `CloudObjects\SDK\ObjectRetriever`. Then you can call `getObject()`. This method returns an `ML\JsonLD\Node` instance or `null` if the object is not found. You can use the object interface of the [JsonLD library](https://github.com/lanthaler/JsonLD/) to read the information from the object.
+``` 
-
-Here's a simple example:
-
-````php
-use ML\IRI\IRI;
-use CloudObjects\SDK\ObjectRetriever;
-
-/* ... */
-
-$retriever = new ObjectRetriever();
-$object = $this->retriever->getObject(new IRI('coid://cloudobjects.io'));
-if (isset($object))
-    echo $object->getProperty('http://www.w3.org/2000/01/rdf-schema#label')->getValue();
-else
-    echo "Object not found.";
-````
-
-### Configuration
-
-You can pass an array of configuration options to the ObjectRetriever's constructor:
-
-| Option | Description | Default |
-|---|---|---|
-| `cache_provider` | The type of cache used. Currently supports `redis`, `file` and `none`. | `none` |
-| `cache_prefix` | A prefix used for cache IDs. Normally this should not be set but might be necessary on shared caches. | `clobj:` |
-| `cache_ttl` | Determines how long objects can remain cached. | `60` |
-| `auth_ns` | The namespace of the service that this retriever acts for. If not set the API is accessed anonymously. | `null` |
-| `auth_secret` | The shared secret between the namespace in `auth_ns` and `cloudobjects.io` for authenticated. If not set the API is accessed anonymously. | `null` |
-
-#### For `redis` cache:
-
-| Option | Description | Default |
-|---|---|---|
-| `cache_provider.redis.host` | The hostname or IP of the Redis instance. | `127.0.0.1` |
-| `cache_provider.redis.port` | The port number of the Redis instance. | `6379` |
-
-#### For `file` cache:
-
-| Option | Description | Default |
-|---|---|---|
-| `cache_provider.file.directory` | The directory to store cache data in. | The system's temporary directory. |
 
 ## License
 

composer.json

@@ -6,12 +6,12 @@
 	"license": "MPL-2.0",
 	"require" : {
 		"ml/json-ld": ">=1.0.7",
-		"doctrine/common" : ">=2.6.1",
-		"doctrine/cache" : "1.*",
 		"guzzlehttp/guzzle" : ">=6.0",
+		"psr/cache": ">=1.0",
 		"psr/log": ">=1.1",
 		"kevinrob/guzzle-cache-middleware": "^7.0.0",
-		"webmozart/assert": "^1.6"		
+		"webmozart/assert": "^1.6",
+		"psr/simple-cache": "^3.0"		
 	},
 	"authors": [
 		{

composer.lock

@@ -4,395 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "c3afb3b29d3f46223386d29810f6e8d5",
+    "content-hash": "659b8e6e4e495bf62452eb85772ac9aa",
     "packages": [
-        {
-            "name": "doctrine/cache",
-            "version": "1.13.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/doctrine/cache.git",
-                "reference": "56cd022adb5514472cb144c087393c1821911d09"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/cache/zipball/56cd022adb5514472cb144c087393c1821911d09",
-                "reference": "56cd022adb5514472cb144c087393c1821911d09",
-                "shasum": ""
-            },
-            "require": {
-                "php": "~7.1 || ^8.0"
-            },
-            "conflict": {
-                "doctrine/common": ">2.2,<2.4"
-            },
-            "require-dev": {
-                "alcaeus/mongo-php-adapter": "^1.1",
-                "cache/integration-tests": "dev-master",
-                "doctrine/coding-standard": "^9",
-                "mongodb/mongodb": "^1.1",
-                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
-                "predis/predis": "~1.0",
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         },
         {
             "name": "symfony/http-foundation",
-            "version": "v7.4.5",
+            "version": "v7.4.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/http-foundation.git",
-                "reference": "446d0db2b1f21575f1284b74533e425096abdfb6"
+                "reference": "9381209597ec66c25be154cbf2289076e64d1eab"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/446d0db2b1f21575f1284b74533e425096abdfb6",
+                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/9381209597ec66c25be154cbf2289076e64d1eab",
-                "reference": "446d0db2b1f21575f1284b74533e425096abdfb6",
+                "reference": "9381209597ec66c25be154cbf2289076e64d1eab",
                 "shasum": ""
             },
             "require": {
@@ -3250,7 +2934,7 @@
             "description": "Defines an object-oriented layer for the HTTP specification",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/http-foundation/tree/v7.4.5"
+                "source": "https://github.com/symfony/http-foundation/tree/v7.4.8"
             },
             "funding": [
                 {
@@ -3270,20 +2954,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2026-01-27T16:16:02+00:00"
+            "time": "2026-03-24T13:12:05+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.33.0",
+            "version": "v1.38.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493"
+                "reference": "14c5439eec4ccff081ac14eca2dc57feb2a66d92"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/6d857f4d76bd4b343eac26d6b539585d2bc56493",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/14c5439eec4ccff081ac14eca2dc57feb2a66d92",
-                "reference": "6d857f4d76bd4b343eac26d6b539585d2bc56493",
+                "reference": "14c5439eec4ccff081ac14eca2dc57feb2a66d92",
                 "shasum": ""
             },
             "require": {
@@ -3335,7 +3019,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.33.0"
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.38.1"
             },
             "funding": [
                 {
@@ -3355,20 +3039,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-12-23T08:48:59+00:00"
+            "time": "2026-05-26T12:51:13+00:00"
         },
         {
             "name": "symfony/psr-http-message-bridge",
-            "version": "v7.4.4",
+            "version": "v7.4.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/psr-http-message-bridge.git",
-                "reference": "929ffe10bbfbb92e711ac3818d416f9daffee067"
+                "reference": "76f1a57719a4a04c0ea18678a6c9305b5dcb9da8"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/psr-http-message-bridge/zipball/929ffe10bbfbb92e711ac3818d416f9daffee067",
+                "url": "https://api.github.com/repos/symfony/psr-http-message-bridge/zipball/76f1a57719a4a04c0ea18678a6c9305b5dcb9da8",
-                "reference": "929ffe10bbfbb92e711ac3818d416f9daffee067",
+                "reference": "76f1a57719a4a04c0ea18678a6c9305b5dcb9da8",
                 "shasum": ""
             },
             "require": {
@@ -3423,7 +3107,7 @@
                 "psr-7"
             ],
             "support": {
-                "source": "https://github.com/symfony/psr-http-message-bridge/tree/v7.4.4"
+                "source": "https://github.com/symfony/psr-http-message-bridge/tree/v7.4.8"
             },
             "funding": [
                 {
@@ -3443,7 +3127,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2026-01-03T23:30:35+00:00"
+            "time": "2026-03-24T13:12:05+00:00"
         },
         {
             "name": "theseer/tokenizer",

tests/OfflineTests/NodeReaderMockTest.php

@@ -7,6 +7,7 @@
 namespace CloudObjects\SDK;
 
 use ML\IRI\IRI;
+use ML\JsonLD\Node;
 use GuzzleHttp\Client, GuzzleHttp\Handler\MockHandler,
     GuzzleHttp\HandlerStack, GuzzleHttp\Psr7\Response;
 
@@ -24,7 +25,8 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
     private function useRootResourceMock() {
         $this->setMockResponse(new Response(200,
             ['Content-Type' => 'application/ld+json'],
-      '{"@context":{"co":"coid:\/\/cloudobjects.io\/","rdf":"http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#","agws":"coid:\/\/aauid.net\/","rdfs":"http:\/\/www.w3.org\/2000\/01\/rdf-schema#"},"@id":"coid:\/\/cloudobjects.io","@type":["agws:Service","co:Namespace"],"co:isAtRevision":"6-fbea0c90b2c5e5300e4039ed99be9b2d","co:isVisibleTo":{"@id":"co:Public"},"co:recommendsPrefix":"co","co:wasUpdatedAt":{"@type":"http:\/\/www.w3.org\/2001\/XMLSchema#dateTime","@value":"2017-01-16T17:29:22+00:00"},"rdfs:comment":"The CloudObjects namespace defines the essential objects.","rdfs:label":"CloudObjects"}'));
+            '{"@context":{"co":"coid:\/\/cloudobjects.io\/","rdf":"http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#","agws":"coid:\/\/aauid.net\/","rdfs":"http:\/\/www.w3.org\/2000\/01\/rdf-schema#"},"@id":"coid:\/\/cloudobjects.io","@type":["agws:Service","co:Namespace"],"co:isAtRevision":"6-fbea0c90b2c5e5300e4039ed99be9b2d","co:isVisibleTo":{"@id":"co:Public"},"co:recommendsPrefix":"co","co:wasUpdatedAt":{"@type":"http:\/\/www.w3.org\/2001\/XMLSchema#dateTime","@value":"2017-01-16T17:29:22+00:00"},"rdfs:comment":"The CloudObjects namespace defines the essential objects.","rdfs:label":"CloudObjects"}'
+        ));
     }
 
     protected function setUp(): void {
@@ -35,12 +37,13 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
                 'rdfs' => 'http://www.w3.org/2000/01/rdf-schema#'
             ]
         ]);
+        $this->retriever->setDefaultReader($this->reader);
     }
 
     public function testHasType1() {    
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
     
         $this->assertTrue($this->reader->hasType($object, 'coid://cloudobjects.io/Namespace'));
         $this->assertTrue($this->reader->hasType($object, 'co:Namespace'));
@@ -51,7 +54,7 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
     public function testHasPropertyValue1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
 
         $this->assertTrue($this->reader->hasPropertyValue($object, 'http://www.w3.org/2000/01/rdf-schema#label', 'CloudObjects'));
         $this->assertTrue($this->reader->hasPropertyValue($object, 'rdfs:label', 'CloudObjects'));
@@ -60,7 +63,7 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
     public function testGetFirstValueString1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
     
         $this->assertEquals('CloudObjects', $this->reader->getFirstValueString($object, 'http://www.w3.org/2000/01/rdf-schema#label'));
         $this->assertEquals('CloudObjects', $this->reader->getFirstValueString($object, 'rdfs:label'));
@@ -70,36 +73,63 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
 
         $this->assertEquals('theDefaultValue', $this->reader->getFirstValueString($object, 'coid://cloudobjects.io/makesTriplesVisibleTo', 'theDefaultValue'));
         $this->assertEquals('theDefaultValue', $this->reader->getFirstValueString($object, 'co:makesTriplesVisibleTo', 'theDefaultValue'));
+
+        $object = $this->retriever->getCloudObject($coid);
+        
+        $this->assertEquals('CloudObjects', $object->getString('http://www.w3.org/2000/01/rdf-schema#label'));
+        $this->assertEquals('CloudObjects', $object->getString('rdfs:label'));
+
+        $this->assertNull($object->getString('coid://cloudobjects.io/makesTriplesVisibleTo'));
+        $this->assertNull($object->getString('co:makesTriplesVisibleTo'));
+
+        $this->assertEquals('theDefaultValue', $object->getString('coid://cloudobjects.io/makesTriplesVisibleTo', 'theDefaultValue'));
+        $this->assertEquals('theDefaultValue', $object->getString('co:makesTriplesVisibleTo', 'theDefaultValue'));
     }
 
     public function testGetFirstValueIRI1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
 
-    $this->assertInstanceOf('ML\IRI\IRI', $this->reader->getFirstValueIRI($object, 'coid://cloudobjects.io/isVisibleTo'));
+        $this->assertInstanceOf(IRI::class, $this->reader->getFirstValueIRI($object, 'coid://cloudobjects.io/isVisibleTo'));
-    $this->assertInstanceOf('ML\IRI\IRI', $this->reader->getFirstValueIRI($object, 'co:isVisibleTo'));
+        $this->assertInstanceOf(IRI::class, $this->reader->getFirstValueIRI($object, 'co:isVisibleTo'));
     
         $this->assertEquals(new IRI('coid://cloudobjects.io/Public'), $this->reader->getFirstValueIRI($object, 'coid://cloudobjects.io/isVisibleTo'));
         $this->assertEquals(new IRI('coid://cloudobjects.io/Public'), $this->reader->getFirstValueIRI($object, 'co:isVisibleTo'));
+
+        $object = $this->retriever->getCloudObject($coid);
+
+        $this->assertInstanceOf(IRI::class, $object->getIRI('coid://cloudobjects.io/isVisibleTo'));
+        $this->assertInstanceOf(IRI::class, $object->getIRI('co:isVisibleTo'));
+
+        $this->assertEquals(new IRI('coid://cloudobjects.io/Public'), $object->getIRI('coid://cloudobjects.io/isVisibleTo'));
+        $this->assertEquals(new IRI('coid://cloudobjects.io/Public'), $object->getIRI('co:isVisibleTo'));
     }
 
     public function testGetFirstValueNode1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
 
-    $this->assertInstanceOf('ML\JsonLD\Node', $this->reader->getFirstValueNode($object, 'coid://cloudobjects.io/isVisibleTo'));
+        $this->assertInstanceOf(Node::class, $this->reader->getFirstValueNode($object, 'coid://cloudobjects.io/isVisibleTo'));
-    $this->assertInstanceOf('ML\JsonLD\Node', $this->reader->getFirstValueNode($object, 'co:isVisibleTo'));
+        $this->assertInstanceOf(Node::class, $this->reader->getFirstValueNode($object, 'co:isVisibleTo'));
     
         $this->assertEquals('coid://cloudobjects.io/Public', $this->reader->getFirstValueNode($object, 'coid://cloudobjects.io/isVisibleTo')->getId());
         $this->assertEquals('coid://cloudobjects.io/Public', $this->reader->getFirstValueNode($object, 'co:isVisibleTo')->getId());
+
+        $object = $this->retriever->getCloudObject($coid);
+
+        $this->assertInstanceOf(Node::class, $object->getNode('coid://cloudobjects.io/isVisibleTo'));
+        $this->assertInstanceOf(Node::class, $object->getNode('co:isVisibleTo'));
+
+        $this->assertEquals('coid://cloudobjects.io/Public', $object->getNode('coid://cloudobjects.io/isVisibleTo')->getId());
+        $this->assertEquals('coid://cloudobjects.io/Public', $object->getNode('co:isVisibleTo')->getId());
     }
 
     public function testGetAllValuesString1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
     
         $this->assertCount(1, $this->reader->getAllValuesString($object, 'http://www.w3.org/2000/01/rdf-schema#label'));
         $this->assertCount(1, $this->reader->getAllValuesString($object, 'rdfs:label'));
@@ -116,7 +146,7 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
     public function testGetAllValuesIRI1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
 
         $this->assertCount(0, $this->reader->getAllValuesIRI($object, 'http://www.w3.org/2000/01/rdf-schema#label'));
         $this->assertCount(0, $this->reader->getAllValuesIRI($object, 'rdfs:label'));
@@ -126,8 +156,8 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
 
         $this->assertCount(2, $this->reader->getAllValuesIRI($object, '@type'));
 
-    $this->assertInstanceOf('ML\IRI\IRI', $this->reader->getAllValuesIRI($object, 'coid://cloudobjects.io/isVisibleTo')[0]);
+        $this->assertInstanceOf(IRI::class, $this->reader->getAllValuesIRI($object, 'coid://cloudobjects.io/isVisibleTo')[0]);
-    $this->assertInstanceOf('ML\IRI\IRI', $this->reader->getAllValuesIRI($object, 'co:isVisibleTo')[0]);
+        $this->assertInstanceOf(IRI::class, $this->reader->getAllValuesIRI($object, 'co:isVisibleTo')[0]);
 
         $this->assertEquals(new IRI('coid://cloudobjects.io/Public'), $this->reader->getAllValuesIRI($object, 'coid://cloudobjects.io/isVisibleTo')[0]);
         $this->assertEquals(new IRI('coid://cloudobjects.io/Public'), $this->reader->getAllValuesIRI($object, 'co:isVisibleTo')[0]);
@@ -136,7 +166,7 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
     public function testGetAllValuesNode1() {
         $coid = new IRI('coid://cloudobjects.io');
         $this->useRootResourceMock();
-    $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
 
         $this->assertCount(0, $this->reader->getAllValuesNode($object, 'http://www.w3.org/2000/01/rdf-schema#label'));
         $this->assertCount(0, $this->reader->getAllValuesNode($object, 'rdfs:label'));
@@ -146,8 +176,8 @@ class NodeReaderMockTest extends \PHPUnit\Framework\TestCase {
 
         $this->assertCount(2, $this->reader->getAllValuesNode($object, '@type'));
 
-    $this->assertInstanceOf('ML\JsonLD\Node', $this->reader->getAllValuesNode($object, 'coid://cloudobjects.io/isVisibleTo')[0]);
+        $this->assertInstanceOf(Node::class, $this->reader->getAllValuesNode($object, 'coid://cloudobjects.io/isVisibleTo')[0]);
-    $this->assertInstanceOf('ML\JsonLD\Node', $this->reader->getAllValuesNode($object, 'co:isVisibleTo')[0]);
+        $this->assertInstanceOf(Node::class, $this->reader->getAllValuesNode($object, 'co:isVisibleTo')[0]);
 
         $this->assertEquals('coid://cloudobjects.io/Public', $this->reader->getAllValuesNode($object, 'coid://cloudobjects.io/isVisibleTo')[0]->getId());
         $this->assertEquals('coid://cloudobjects.io/Public', $this->reader->getAllValuesNode($object, 'co:isVisibleTo')[0]->getId());

tests/OfflineTests/ObjectRetrieverMockTest.php

@@ -43,7 +43,7 @@ class ObjectRetrieverMockTest extends \PHPUnit\Framework\TestCase {
         // Test CloudObject interface
         $object = $this->retriever->getCloudObject($coid);
         $this->assertNotNull($object);
-        $this->assertEquals((string)$coid, $object->getObjectNode()->getID());
+        $this->assertEquals((string)$coid, $object->getAsNode()->getId());
         $this->assertEquals($coid, $object->getCOID());
         $this->assertNotNull($object->getString('http://www.w3.org/2000/01/rdf-schema#label'));
         $this->assertEquals('CloudObjects', $object->getString('http://www.w3.org/2000/01/rdf-schema#label'));

tests/OnlineTests/ObjectRetrieverCacheTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ 
+namespace CloudObjects\SDK;
+
+use ML\IRI\IRI;
+use Kevinrob\GuzzleCache\Storage\VolatileRuntimeStorage;
+use CloudObjects\SDK\TestHelpers\InMemoryLogger;
+
+class ObjectRetrieverCacheTest extends \PHPUnit\Framework\TestCase {
+
+    public function testCacheInRuntimeStorage() {
+        $cacheStorage = new VolatileRuntimeStorage;
+        $logger = new InMemoryLogger;
+
+        $coid = new IRI('coid://cloudobjects.io');
+
+        $retriever = new ObjectRetriever([
+            'cache_storage' => $cacheStorage,
+            'logger' => $logger
+        ]);
+
+        $object1 = $retriever->getCloudObject($coid);
+
+        $this->assertNotNull($object1);
+        $this->assertNotNull($cacheStorage->fetch($retriever->getCacheKey((string)$coid)));
+        $this->assertStringContainsString('from Core API', $logger->getLastLogMessage());
+
+        // Reinitialize retriever with same cache storage to verify that cache is used
+        $retriever = new ObjectRetriever([
+            'cache_storage' => $cacheStorage,
+            'logger' => $logger
+        ]);
+
+        $object2 = $retriever->getCloudObject($coid);
+
+        $this->assertNotNull($object2);
+        $this->assertNotNull($cacheStorage->fetch($retriever->getCacheKey((string)$coid)));
+        $this->assertStringContainsString('from object cache', $logger->getLastLogMessage());
+
+        $this->assertEquals($object1->getRevision(), $object2->getRevision());
+    }
+
+}

tests/OnlineTests/ObjectRetrieverPublicTest.php

@@ -26,13 +26,25 @@ class ObjectRetrieverPublicTest extends \PHPUnit\Framework\TestCase {
 
     public function testGetRootObject() {
         $coid = new IRI('coid://cloudobjects.io');
-        $object = $this->retriever->getObject($coid);
+        $object = $this->retriever->getObjectNode($coid);
         $this->assertNotNull($object);
-        $this->assertEquals((string)$coid, $object->getID());
+        $this->assertEquals((string)$coid, $object->getId());
         $this->assertNotNull($object->getProperty('http://www.w3.org/2000/01/rdf-schema#label'));
         $this->assertEquals('CloudObjects', $object->getProperty('http://www.w3.org/2000/01/rdf-schema#label')->getValue());        
     }
 
+    public function testGetRelatedObject() {
+        $coid = new IRI('coid://cloudobjects.io');
+        $object = $this->retriever->getCloudObject($coid);
+        $this->assertNotNull($object);
+        $this->assertNotNull($object->getIRI('coid://cloudobjects.io/isVisibleTo'));
+        $this->assertEquals('coid://cloudobjects.io/Public', $object->getString('coid://cloudobjects.io/isVisibleTo'));
+        
+        $relatedObject = $object->getCloudObject('coid://cloudobjects.io/isVisibleTo');
+        $this->assertNotNull($relatedObject);
+        $this->assertEquals('coid://cloudobjects.io/Public', (string)$relatedObject->getCOID());
+    }
+
     public function testGetCOIDList() {
         $coid = new IRI('coid://cloudobjects.io');
         $list = $this->stringifyItems(