LanguageClient: add cache for document symbols

Change-Id: Ia4c4061258c74d839edbd472c2087be74ac30113
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

7 files changed, 170 insertions, 24 deletions

diff --git a/src/plugins/languageclient/client.cpp b/src/plugins/languageclient/client.cpp
index 12c8f86531d..dd544f37e9f 100644
--- a/src/plugins/languageclient/client.cpp
+++ b/src/plugins/languageclient/client.cpp
@@ -94,6 +94,7 @@ Client::Client(BaseClientInterface *clientInterface)
     , m_completionProvider(this)
     , m_quickFixProvider(this)
     , m_clientInterface(clientInterface)
+    , m_documentSymbolCache(this)
 {
     m_contentHandler.insert(JsonRpcMessageHandler::jsonRpcMimeType(),
                             &JsonRpcMessageHandler::parseContent);
@@ -859,6 +860,11 @@ const BaseClientInterface *Client::clientInterface() const
     return m_clientInterface.data();
 }
 
+DocumentSymbolCache *Client::documentSymbolCache()
+{
+    return &m_documentSymbolCache;
+}
+
 void Client::log(const ShowMessageParams &message,
                      Core::MessageManager::PrintToOutputPaneFlag flag)
 {
diff --git a/src/plugins/languageclient/client.h b/src/plugins/languageclient/client.h
index d29c4f6a888..f2f92cbfe6a 100644
--- a/src/plugins/languageclient/client.h
+++ b/src/plugins/languageclient/client.h
@@ -25,6 +25,7 @@
 
 #pragma once
 
+#include "documentsymbolcache.h"
 #include "dynamiccapabilities.h"
 #include "languageclientcompletionassist.h"
 #include "languageclientquickfix.h"
@@ -148,6 +149,7 @@ public:
     const LanguageServerProtocol::ServerCapabilities &capabilities() const;
     const DynamicCapabilities &dynamicCapabilities() const;
     const BaseClientInterface *clientInterface() const;
+    DocumentSymbolCache *documentSymbolCache();
 
 signals:
     void initialized(LanguageServerProtocol::ServerCapabilities capabilities);
@@ -197,6 +199,7 @@ private:
     int m_restartsLeft = 5;
     QScopedPointer<BaseClientInterface> m_clientInterface;
     QMap<LanguageServerProtocol::DocumentUri, QList<TextMark *>> m_diagnostics;
+    DocumentSymbolCache m_documentSymbolCache;
 };
 
 } // namespace LanguageClient
diff --git a/src/plugins/languageclient/documentsymbolcache.cpp b/src/plugins/languageclient/documentsymbolcache.cpp
new file mode 100644
index 00000000000..b922486d56e
--- /dev/null
+++ b/src/plugins/languageclient/documentsymbolcache.cpp
@@ -0,0 +1,81 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "documentsymbolcache.h"
+
+#include "client.h"
+
+#include <coreplugin/editormanager/editormanager.h>
+#include <texteditor/textdocument.h>
+
+using namespace LanguageServerProtocol;
+
+namespace LanguageClient {
+
+DocumentSymbolCache::DocumentSymbolCache(Client *client)
+    : QObject(client)
+    , m_client(client)
+{
+    connect(Core::EditorManager::instance(),
+            &Core::EditorManager::documentOpened,
+            this,
+            [this](Core::IDocument *document) {
+                connect(document, &Core::IDocument::contentsChanged, this, [this, document]() {
+                    m_cache.remove(DocumentUri::fromFileName(document->filePath()));
+                });
+            });
+}
+
+void DocumentSymbolCache::requestSymbols(const DocumentUri &uri)
+{
+    auto entry = m_cache.find(uri);
+    if (entry != m_cache.end()) {
+        emit gotSymbols(uri, entry.value());
+        return;
+    }
+
+    const DocumentSymbolParams params((TextDocumentIdentifier(uri)));
+    DocumentSymbolsRequest request(params);
+    request.setResponseCallback([uri, self = QPointer<DocumentSymbolCache>(this)](
+                                    const DocumentSymbolsRequest::Response &response) {
+        if (self)
+            self->handleResponse(uri, response);
+    });
+    m_client->sendContent(request);
+}
+
+void DocumentSymbolCache::handleResponse(const DocumentUri &uri,
+                                         const DocumentSymbolsRequest::Response &response)
+{
+    if (Utils::optional<DocumentSymbolsRequest::Response::Error> error = response.error()) {
+        if (m_client)
+            m_client->log(error.value());
+    }
+    const DocumentSymbolsResult &symbols = response.result().value_or(DocumentSymbolsResult());
+    m_cache[uri] = symbols;
+    emit gotSymbols(uri, symbols);
+}
+
+} // namespace LanguageClient
diff --git a/src/plugins/languageclient/documentsymbolcache.h b/src/plugins/languageclient/documentsymbolcache.h
new file mode 100644
index 00000000000..2f0b2376bc3
--- /dev/null
+++ b/src/plugins/languageclient/documentsymbolcache.h
@@ -0,0 +1,58 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include "utils/optional.h"
+
+#include <languageserverprotocol/languagefeatures.h>
+
+#include <QObject>
+
+namespace LanguageClient {
+
+class Client;
+
+class DocumentSymbolCache : public QObject
+{
+    Q_OBJECT
+public:
+    DocumentSymbolCache(Client *client);
+
+    void requestSymbols(const LanguageServerProtocol::DocumentUri &uri);
+
+signals:
+    void gotSymbols(const LanguageServerProtocol::DocumentUri &uri,
+                    const LanguageServerProtocol::DocumentSymbolsResult &symbols);
+
+private:
+    void handleResponse(const LanguageServerProtocol::DocumentUri &uri,
+                        const LanguageServerProtocol::DocumentSymbolsRequest::Response &response);
+
+    QMap<LanguageServerProtocol::DocumentUri, LanguageServerProtocol::DocumentSymbolsResult> m_cache;
+    Client *m_client = nullptr;
+};
+
+} // namespace LanguageClient
diff --git a/src/plugins/languageclient/languageclient.pro b/src/plugins/languageclient/languageclient.pro
index dbae20e1098..912873134b7 100644
--- a/src/plugins/languageclient/languageclient.pro
+++ b/src/plugins/languageclient/languageclient.pro
@@ -4,6 +4,7 @@ DEFINES += LANGUAGECLIENT_LIBRARY
 
 HEADERS += \
     client.h \
+    documentsymbolcache.h \
     dynamiccapabilities.h \
     languageclient_global.h \
     languageclientcompletionassist.h \
@@ -18,6 +19,7 @@ HEADERS += \
 
 SOURCES += \
     client.cpp \
+    documentsymbolcache.cpp \
     dynamiccapabilities.cpp \
     languageclientcompletionassist.cpp \
     languageclientinterface.cpp \
diff --git a/src/plugins/languageclient/languageclient.qbs b/src/plugins/languageclient/languageclient.qbs
index 0c2752ef5eb..b2520fba34d 100644
--- a/src/plugins/languageclient/languageclient.qbs
+++ b/src/plugins/languageclient/languageclient.qbs
@@ -16,6 +16,8 @@ QtcPlugin {
     files: [
         "client.cpp",
         "client.h",
+        "documentsymbolcache.cpp",
+        "documentsymbolcache.h",
         "dynamiccapabilities.cpp",
         "dynamiccapabilities.h",
         "languageclient.qrc",
diff --git a/src/plugins/languageclient/languageclientoutline.cpp b/src/plugins/languageclient/languageclientoutline.cpp
index 3c3a1aa1b16..e08587c1d32 100644
--- a/src/plugins/languageclient/languageclientoutline.cpp
+++ b/src/plugins/languageclient/languageclientoutline.cpp
@@ -155,7 +155,7 @@ public:
     void setCursorSynchronization(bool syncWithCursor) override;
 
 private:
-    void handleResponse(const LanguageServerProtocol::DocumentSymbolsRequest::Response &response);
+    void handleResponse(const DocumentUri &uri, const DocumentSymbolsResult &response);
     void updateTextCursor(const QModelIndex &proxyIndex);
     void updateSelectionInTree(const QTextCursor &currentCursor);
     void onItemActivated(const QModelIndex &index);
@@ -164,6 +164,7 @@ private:
     QPointer<TextEditor::BaseTextEditor> m_editor;
     LanguageClientOutlineModel m_model;
     Utils::TreeView m_view;
+    DocumentUri m_uri;
     bool m_sync = false;
 };
 
@@ -172,23 +173,19 @@ LanguageClientOutlineWidget::LanguageClientOutlineWidget(Client *client,
     : m_client(client)
     , m_editor(editor)
     , m_view(this)
+    , m_uri(DocumentUri::fromFileName(editor->textDocument()->filePath()))
 {
-    const DocumentSymbolParams params(
-                TextDocumentIdentifier(
-                    DocumentUri::fromFileName(editor->textDocument()->filePath())));
-    DocumentSymbolsRequest request(params);
-    request.setResponseCallback([self = QPointer<LanguageClientOutlineWidget>(this)]
-                                (const DocumentSymbolsRequest::Response &response){
-                                    if (self)
-                                        self->handleResponse(response);
-    });
+    connect(client->documentSymbolCache(),
+            &DocumentSymbolCache::gotSymbols,
+            this,
+            &LanguageClientOutlineWidget::handleResponse);
+    client->documentSymbolCache()->requestSymbols(m_uri);
 
     auto *layout = new QVBoxLayout;
     layout->setMargin(0);
     layout->setSpacing(0);
     layout->addWidget(Core::ItemViewFind::createSearchableWrapper(&m_view));
     setLayout(layout);
-    client->sendContent(request);
     m_view.setModel(&m_model);
     m_view.setHeaderHidden(true);
     connect(&m_view, &QAbstractItemView::activated,
@@ -212,20 +209,17 @@ void LanguageClientOutlineWidget::setCursorSynchronization(bool syncWithCursor)
         updateSelectionInTree(m_editor->textCursor());
 }
 
-void LanguageClientOutlineWidget::handleResponse(const DocumentSymbolsRequest::Response &response)
+void LanguageClientOutlineWidget::handleResponse(const DocumentUri &uri,
+                                                 const DocumentSymbolsResult &result)
 {
-    if (Utils::optional<DocumentSymbolsRequest::Response::Error> error = response.error()) {
-        if (m_client)
-            m_client->log(error.value());
-    }
-    if (Utils::optional<DocumentSymbolsResult> result = response.result()) {
-        if (Utils::holds_alternative<QList<SymbolInformation>>(result.value()))
-            m_model.setInfo(Utils::get<QList<SymbolInformation>>(result.value()));
-        else if (Utils::holds_alternative<QList<DocumentSymbol>>(result.value()))
-            m_model.setInfo(Utils::get<QList<DocumentSymbol>>(result.value()));
-        else
-            m_model.clear();
-    }
+    if (uri != m_uri)
+        return;
+    if (Utils::holds_alternative<QList<SymbolInformation>>(result))
+        m_model.setInfo(Utils::get<QList<SymbolInformation>>(result));
+    else if (Utils::holds_alternative<QList<DocumentSymbol>>(result))
+        m_model.setInfo(Utils::get<QList<DocumentSymbol>>(result));
+    else
+        m_model.clear();
 }
 
 void LanguageClientOutlineWidget::updateTextCursor(const QModelIndex &proxyIndex)