Issue 5013 - Mark more method as const

include/AdblockPlus/JsEngine.h

Index: include/AdblockPlus/JsEngine.h
===================================================================
--- a/include/AdblockPlus/JsEngine.h
+++ b/include/AdblockPlus/JsEngine.h
@@ -217,30 +217,30 @@
      *        convert.
      * @return List of arguments converted to `JsValue` objects.
      */
     JsValueList ConvertArguments(const v8::Arguments& arguments);
 
     /**
      * @see `SetFileSystem()`.
      */
-    FileSystemPtr GetFileSystem();
+    FileSystemPtr GetFileSystem() const;
 
     /**
      * Sets the `FileSystem` implementation used for all file I/O.
      * Setting this is optional, the engine will use a `DefaultFileSystem`
      * instance by default, which might be sufficient.
      * @param The `FileSystem` instance to use.
      */
     void SetFileSystem(FileSystemPtr val);
 
     /**
      * @see `SetWebRequest()`.
      */
-    WebRequestPtr GetWebRequest();
+    WebRequestPtr GetWebRequest() const;
 
     /**
      * Sets the `WebRequest` implementation used for XMLHttpRequests.
      * Setting this is optional, the engine will use a `DefaultWebRequest`
      * instance by default, which might be sufficient.
      * @param The `WebRequest` instance to use.
      */
     void SetWebRequest(WebRequestPtr val);
@@ -251,22 +251,22 @@
     * @param callback callback function.
     */
     void SetIsConnectionAllowedCallback(const IsConnectionAllowedCallback& callback);
 
     /**
      * Checks whether current connection is allowed. If
      * IsConnectionAllowedCallback is not set then then it returns true.
      */
-    bool IsConnectionAllowed();
+    bool IsConnectionAllowed() const;
 
     /**
      * @see `SetLogSystem()`.
      */
-    LogSystemPtr GetLogSystem();
+    LogSystemPtr GetLogSystem() const;
 
     /**
      * Sets the `LogSystem` implementation used for logging (e.g. to handle
      * `console.log()` calls from JavaScript).
      * Setting this is optional, the engine will use a `DefaultLogSystem`
      * instance by default, which might be sufficient.
      * @param The `LogSystem` instance to use.
      */
@@ -305,16 +305,16 @@
     ScopedV8IsolatePtr isolate;
 
     FileSystemPtr fileSystem;
     WebRequestPtr webRequest;
     LogSystemPtr logSystem;
     std::unique_ptr<v8::Persistent<v8::Context>> context;
     EventMap eventCallbacks;
     std::mutex eventCallbacksMutex;
-    std::mutex isConnectionAllowedMutex;
+    mutable std::mutex isConnectionAllowedMutex;
     IsConnectionAllowedCallback isConnectionAllowed;
     TimerTasks timerTasks;
     TimerPtr timer;
   };
 }
 
 #endif