Makes the stress threshold configurable. (#584)

* Makes the stress threshold configurable.

* fix: Fix typo.

* Simplify code.

src/main/java/org/jitsi/jicofo/bridge/Bridge.java

@@ -55,12 +55,6 @@ public class Bridge
      */
     public static final int MAX_TOTAL_PACKET_RATE_PPS = config.maxBridgePacketRatePps();
 
-    /**
-     * The stress-level beyond which we consider a bridge to be
-     * overloaded/overstressed.
-     */
-    private static final double OVERSTRESSED_THRESHOLD = .8;
-
     private long failureResetThreshold;
 
     /**
@@ -309,12 +303,11 @@ public double getStress()
     }
 
     /**
-     * @return true if the stress of the bridge is greater-than-or-equal to
-     * {@link #OVERSTRESSED_THRESHOLD}.
+     * @return true if the stress of the bridge is greater-than-or-equal to the threshold.
      */
     public boolean isOverloaded()
     {
-        return getStress() >= OVERSTRESSED_THRESHOLD;
+        return getStress() >= config.stressThreshold();
     }
 
     public int getLastReportedPacketRatePps()

src/main/kotlin/org/jitsi/jicofo/bridge/BridgeConfig.kt

@@ -42,6 +42,9 @@ class BridgeConfig {
     }
     fun averageParticipantPacketRatePps() = averageParticipantPacketRatePps
 
+    val stressThreshold: Double by config { "$BASE.stress-threshold".from(JitsiConfig.newConfig) }
+    fun stressThreshold() = stressThreshold
+
     companion object {
         const val BASE = "jicofo.bridge"
         @JvmField

src/main/resources/reference.conf

@@ -7,6 +7,8 @@ jicofo {
     max-bridge-packet-rate = 50000
     // The assumed average packet rate per participant.
     average-participant-packet-rate-pps = 500
+    // The stress level above which a bridge is considered overstressed.
+    stress-threshold = 0.8
   }
   // Configure the codecs and RTP extensions to be used in the offer sent to clients.
   codec {