LanguageClient: compress requests from the symbol cache

Change-Id: I58c6863fae6e275073c377558eaba18f7f32b4f2
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/languageclient/documentsymbolcache.cpp

@@ -50,10 +50,19 @@ DocumentSymbolCache::DocumentSymbolCache(Client *client)
             &Core::EditorManager::documentOpened,
             this,
             connectDocument);
+    m_compressionTimer.setSingleShot(true);
+    connect(&m_compressionTimer, &QTimer::timeout, this, &DocumentSymbolCache::requestSymbolsImpl);
 }
 
 void DocumentSymbolCache::requestSymbols(const DocumentUri &uri)
 {
+    m_compressedUris.insert(uri);
+    m_compressionTimer.start(200);
+}
+
+void DocumentSymbolCache::requestSymbolsImpl()
+{
+    for (const DocumentUri &uri : qAsConst(m_compressedUris)) {
         auto entry = m_cache.find(uri);
         if (entry != m_cache.end()) {
             emit gotSymbols(uri, entry.value());
@@ -69,6 +78,7 @@ void DocumentSymbolCache::requestSymbols(const DocumentUri &uri)
         });
         m_client->sendContent(request);
     }
+}
 
 void DocumentSymbolCache::handleResponse(const DocumentUri &uri,
                                          const DocumentSymbolsRequest::Response &response)

src/plugins/languageclient/documentsymbolcache.h

@@ -30,6 +30,7 @@
 #include <languageserverprotocol/languagefeatures.h>
 
 #include <QObject>
+#include <QTimer>
 
 namespace LanguageClient {
 
@@ -48,11 +49,14 @@ signals:
                     const LanguageServerProtocol::DocumentSymbolsResult &symbols);
 
 private:
+    void requestSymbolsImpl();
     void handleResponse(const LanguageServerProtocol::DocumentUri &uri,
                         const LanguageServerProtocol::DocumentSymbolsRequest::Response &response);
 
     QMap<LanguageServerProtocol::DocumentUri, LanguageServerProtocol::DocumentSymbolsResult> m_cache;
     Client *m_client = nullptr;
+    QTimer m_compressionTimer;
+    QSet<LanguageServerProtocol::DocumentUri> m_compressedUris;
 };
 
 } // namespace LanguageClient