From edec7f92b20f1f873083bdf3198283fa822e0f64 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Sun, 12 Jan 2020 16:36:42 +0100
Subject: Start removing old gossips

---
 src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java   |  3 +++
 .../pl/edu/mimuw/cloudatlas/agent/HierarchyConfig.java   | 16 ++++++++++++++++
 .../java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java   |  4 ++++
 3 files changed, 23 insertions(+)

(limited to 'src/main/java/pl/edu/mimuw/cloudatlas')

diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java
index 24ed0c1..06e067b 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/Agent.java
@@ -46,9 +46,12 @@ public class Agent {
         String selectionStrategy = System.getProperty("Gossip.zone_strategy");
         Long queryPeriod = Long.getLong("query_period");
         Long gossipPeriod = Long.getLong("gossip_period");
+        Long freshnessPeriod = Long.getLong("freshness_period");
 
         HierarchyConfig hierarchyConfig = new HierarchyConfig(eventBus, zonePath, selectionStrategy);
         hierarchyConfig.startQueries(queryPeriod);
         hierarchyConfig.startGossip(gossipPeriod, zonePath);
+        // TODO: should this be different than ZMI freshness period?
+        hierarchyConfig.startCleaningGossips(freshnessPeriod);
     }
 }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/agent/HierarchyConfig.java b/src/main/java/pl/edu/mimuw/cloudatlas/agent/HierarchyConfig.java
index f9e323a..92b7f66 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/agent/HierarchyConfig.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/agent/HierarchyConfig.java
@@ -153,4 +153,20 @@ public class HierarchyConfig {
 
         AgentUtils.startRecursiveTask(taskSupplier, queriesPeriod, eventBus);
     }
+
+    public void startCleaningGossips(long gossipCleanPeriod) {
+        Supplier<TimerScheduledTask> taskSupplier = () ->
+                new TimerScheduledTask() {
+                    public void run() {
+                        try {
+                            System.out.println("INFO: Scheduling old gossip cleanup");
+                            sendMessage(new CleanOldGossipsMessage("", 0, ValueUtils.addToTime(ValueUtils.currentTime(), -gossipCleanPeriod)));
+                        } catch (InterruptedException e) {
+                            System.out.println("Interrupted while triggering queries");
+                        }
+                    }
+                };
+
+        AgentUtils.startRecursiveTask(taskSupplier, gossipCleanPeriod, eventBus);
+    }
 }
diff --git a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
index 3df8231..866349f 100644
--- a/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
+++ b/src/main/java/pl/edu/mimuw/cloudatlas/model/ValueUtils.java
@@ -12,4 +12,8 @@ public class ValueUtils {
     public static ValueTime currentTime() {
         return new ValueTime(System.currentTimeMillis());
     }
+
+    public static ValueTime addToTime(ValueTime time, long millis) {
+        return time.addValue(new ValueDuration(millis));
+    }
 }
-- 
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