From 6dbb252ce1001fa6ab7c8281ff8a9e2c48acf91c Mon Sep 17 00:00:00 2001
From: Bernd Weimer <bernd.weimer@pelagicore.com>
Date: Fri, 6 Mar 2020 11:32:55 +0100
Subject: Add API to unregister all DLT contexts

The new API unregisters all logging categories and their associated
DLT context Ids. This can be used to change log levels: set new rules
and unregister all contexts.

Change-Id: I1a21dd49d3e3b21fd6f58a2316c60a6f25b29586
Reviewed-by: Dominik Holland <dominik.holland@qt.io>
---
 src/geniviextras/qdltregistration.cpp | 26 +++++++++++++++++++++++++-
 src/geniviextras/qdltregistration.h   |  1 +
 src/geniviextras/qdltregistration_p.h |  1 +
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/geniviextras/qdltregistration.cpp b/src/geniviextras/qdltregistration.cpp
index bef94d1..4ba638a 100644
--- a/src/geniviextras/qdltregistration.cpp
+++ b/src/geniviextras/qdltregistration.cpp
@@ -151,6 +151,16 @@ void QDltRegistrationPrivate::registerCategory(CategoryInfo &info)
     info.m_registered = true;
 }
 
+void QDltRegistrationPrivate::unregisterCategories()
+{
+    for (auto it = m_categoryInfoHash.begin(); it != m_categoryInfoHash.end(); ++it) {
+        if (it.value().m_registered) {
+            DLT_UNREGISTER_CONTEXT(*it.value().m_context);
+            it.value().m_registered = false;
+        }
+    }
+}
+
 void QDltRegistrationPrivate::registerApplication()
 {
     Q_ASSERT_X(!m_dltAppID.isEmpty(), "registerApplication", "dltAppID needs to be a valid char * on the first call.");
@@ -431,7 +441,7 @@ void QDltRegistration::registerUnregisteredContexts()
     for (auto it = d->m_categoryInfoHash.begin(); it != d->m_categoryInfoHash.end(); ++it) {
         if (!it.value().m_registered) {
             d->registerCategory(it.value());
-      }
+        }
     }
 }
 
@@ -458,6 +468,20 @@ void QDltRegistration::unregisterApplication()
     d->unregisterApplication();
 }
 
+/*!
+    Unregisters all categories and their associated context Ids from the dlt-daemon.
+
+    One application of this function could be to update the log level: after this function has been
+    called, all cetegories will be registered again (with new log level), when they are used next
+    time.
+*/
+void QDltRegistration::unregisterCategories()
+{
+    Q_D(QDltRegistration);
+    QMutexLocker l(&d->m_mutex);
+    d->unregisterCategories();
+}
+
 /*!
     The Qt message handler which forwards all the logging messages to the dlt-daemon.
 
diff --git a/src/geniviextras/qdltregistration.h b/src/geniviextras/qdltregistration.h
index 931d164..5afcddc 100644
--- a/src/geniviextras/qdltregistration.h
+++ b/src/geniviextras/qdltregistration.h
@@ -75,6 +75,7 @@ public:
     void unregisterApplication();
 
     void registerCategory(const QLoggingCategory *category, const char *dltCtxName, const char *dltCtxDescription);
+    void unregisterCategories();
     void setDefaultContext(const char *categoryName);
 
     void setRegisterContextOnFirstUseEnabled(bool enabled);
diff --git a/src/geniviextras/qdltregistration_p.h b/src/geniviextras/qdltregistration_p.h
index 98542f4..72a12f6 100644
--- a/src/geniviextras/qdltregistration_p.h
+++ b/src/geniviextras/qdltregistration_p.h
@@ -81,6 +81,7 @@ public:
 
     void registerCategory(const QLoggingCategory *category, DltContext *dltContext, const char *dltCtxName, const char *dltCtxDescription);
     void registerCategory(CategoryInfo &info);
+    void unregisterCategories();
     void registerApplication();
     void unregisterApplication();
     void setDefaultCategory(const QString &category);
-- 
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