Add support for bus audio level metrics, which includes support for removing metrics.

[nageru] / metrics.cpp

diff --git a/metrics.cpp b/metrics.cpp
index 3fadb72907d9afdc5e2574269c57badd539eba6f..f44ced2c15a66715977b352736122442c9ba4541 100644 (file)
--- a/metrics.cpp
+++ b/metrics.cpp
@@ -75,6 +75,22 @@ void Metrics::add(const string &name, const vector<pair<string, string>> &labels
        types[name] = TYPE_HISTOGRAM;
 }
 
+void Metrics::remove(const string &name, const vector<pair<string, string>> &labels)
+{
+       lock_guard<mutex> lock(mu);
+
+       auto it = metrics.find(MetricKey(name, labels));
+       assert(it != metrics.end());
+
+       // If this is the last metric with this name, remove the type as well.
+       if (!((it != metrics.begin() && prev(it)->first.name == name) ||
+             (it != metrics.end() && next(it)->first.name == name))) {
+               types.erase(name);
+       }
+
+       metrics.erase(it);
+}
+
 string Metrics::serialize() const
 {
        stringstream ss;