diff --git a/src/ContentRetriever/ClientContentRetriever.php b/src/ContentRetriever/ClientContentRetriever.php
new file mode 100644
index 0000000..b88042c
--- /dev/null
+++ b/src/ContentRetriever/ClientContentRetriever.php
@@ -0,0 +1,36 @@
+<?php
+declare(strict_types = 1);
+
+namespace LanguageServer\ContentRetriever;
+
+use LanguageServer\LanguageClient;
+use LanguageServer\Protocol\{TextDocumentIdentifier, TextDocumentItem};
+use Sabre\Event\Promise;
+
+/**
+ * Retrieves file content from the client through a textDocument/xcontent request
+ */
+class ClientContentRetriever implements ContentRetriever
+{
+    /**
+     * @param LanguageClient $client
+     */
+    public function __construct(LanguageClient $client)
+    {
+        $this->client = $client;
+    }
+
+    /**
+     * Retrieves the content of a text document identified by the URI through a textDocument/xcontent request
+     *
+     * @param string $uri The URI of the document
+     * @return Promise <string> Resolved with the content as a string
+     */
+    public function retrieve(string $uri): Promise
+    {
+        return $this->client->textDocument->xcontent(new TextDocumentIdentifier($uri))
+            ->then(function (TextDocumentItem $textDocument) {
+                return $textDocument->text;
+            });
+    }
+}
diff --git a/src/ContentRetriever/ContentRetriever.php b/src/ContentRetriever/ContentRetriever.php
new file mode 100644
index 0000000..4d16b98
--- /dev/null
+++ b/src/ContentRetriever/ContentRetriever.php
@@ -0,0 +1,20 @@
+<?php
+declare(strict_types = 1);
+
+namespace LanguageServer\ContentRetriever;
+
+use Sabre\Event\Promise;
+
+/**
+ * Interface for retrieving the content of a text document
+ */
+interface ContentRetriever
+{
+    /**
+     * Retrieves the content of a text document identified by the URI
+     *
+     * @param string $uri The URI of the document
+     * @return Promise <string> Resolved with the content as a string
+     */
+    public function retrieve(string $uri): Promise;
+}
diff --git a/src/ContentRetriever/FileSystemContentRetriever.php b/src/ContentRetriever/FileSystemContentRetriever.php
new file mode 100644
index 0000000..82e7002
--- /dev/null
+++ b/src/ContentRetriever/FileSystemContentRetriever.php
@@ -0,0 +1,24 @@
+<?php
+declare(strict_types = 1);
+
+namespace LanguageServer\ContentRetriever;
+
+use Sabre\Event\Promise;
+use function LanguageServer\uriToPath;
+
+/**
+ * Retrieves document content from the file system
+ */
+class FileSystemContentRetriever implements ContentRetriever
+{
+    /**
+     * Retrieves the content of a text document identified by the URI from the file system
+     *
+     * @param string $uri The URI of the document
+     * @return Promise <string> Resolved with the content as a string
+     */
+    public function retrieve(string $uri): Promise
+    {
+        return Promise\resolve(file_get_contents(uriToPath($uri)));
+    }
+}
diff --git a/src/Project.php b/src/Project.php
index 3021a1c..2544fa7 100644
--- a/src/Project.php
+++ b/src/Project.php
@@ -5,6 +5,7 @@ namespace LanguageServer;
 
 use LanguageServer\Protocol\{SymbolInformation, TextDocumentIdentifier, ClientCapabilities};
 use phpDocumentor\Reflection\DocBlockFactory;
+use LanguageServer\ContentRetriever\{ContentRetriever, ClientContentRetriever, FileSystemContentRetriever};
 use Sabre\Event\Promise;
 use function Sabre\Event\coroutine;
 
@@ -67,6 +68,13 @@ class Project
      */
     private $clientCapabilities;
 
+    /**
+     * The content retriever
+     *
+     * @var ContentRetriever
+     */
+    private $contentRetriever;
+
     public function __construct(LanguageClient $client, ClientCapabilities $clientCapabilities)
     {
         $this->client = $client;
@@ -74,6 +82,11 @@ class Project
         $this->parser = new Parser;
         $this->docBlockFactory = DocBlockFactory::createInstance();
         $this->definitionResolver = new DefinitionResolver($this);
+        if ($clientCapabilities->xcontentProvider) {
+            $this->contentRetriever = new ClientContentRetriever($client);
+        } else {
+            $this->contentRetriever = new FileSystemContentRetriever;
+        }
     }
 
     /**
@@ -112,19 +125,10 @@ class Project
     {
         return coroutine(function () use ($uri) {
             $limit = 150000;
-            if ($this->clientCapabilities->xcontentProvider) {
-                $content = (yield $this->client->textDocument->xcontent(new TextDocumentIdentifier($uri)))->text;
+            $content = yield $this->contentRetriever->retrieve($uri);
                 $size = strlen($content);
                 if ($size > $limit) {
                     throw new ContentTooLargeException($uri, $size, $limit);
-                }
-            } else {
-                $path = uriToPath($uri);
-                $size = filesize($path);
-                if ($size > $limit) {
-                    throw new ContentTooLargeException($uri, $size, $limit);
-                }
-                $content = file_get_contents($path);
             }
             if (isset($this->documents[$uri])) {
                 $document = $this->documents[$uri];