1 files changed, 36 insertions, 0 deletions
diff --git a/src/mbgl/util/throttler.cpp b/src/mbgl/util/throttler.cpp
new file mode 100644
index 0000000000..910810ce2f
--- /dev/null
+++ b/src/mbgl/util/throttler.cpp
@@ -0,0 +1,36 @@
+#include <mbgl/util/throttler.hpp>
+
+namespace mbgl {
+namespace util {
+
+Throttler::Throttler(Duration frequency_, std::function<void()>&& function_)
+    : frequency(frequency_)
+    , function(std::move(function_))
+    , pendingInvocation(false)
+    , lastInvocation(TimePoint::min())
+{}
+
+void Throttler::invoke() {
+    if (pendingInvocation) {
+        return;
+    }
+    
+    Duration timeToNextInvocation = lastInvocation == TimePoint::min()
+        ? Duration::zero()
+        : (lastInvocation + frequency) - Clock::now();
+    
+    if (timeToNextInvocation <= Duration::zero()) {
+        lastInvocation = Clock::now();
+        function();
+    } else {
+        pendingInvocation = true;
+        timer.start(timeToNextInvocation, Duration::zero(), [this]{
+            pendingInvocation = false;
+            lastInvocation = Clock::now();
+            function();
+        });
+    }
+}
+
+} // namespace util
+} // namespace mbgl