mark scheduler threads as daemon so they don't block JVM shutdown (#94)

Author: rob-odwyer

src/main/java/com/devcycle/sdk/server/local/managers/DaemonThreadFactory.java

@@ -0,0 +1,14 @@
+package com.devcycle.sdk.server.local.managers;
+
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.Executors;
+
+public class DaemonThreadFactory implements ThreadFactory {
+    private ThreadFactory defaultThreadFactory = Executors.defaultThreadFactory();
+
+    public Thread newThread(Runnable r) {
+        Thread thread = defaultThreadFactory.newThread(r);
+        thread.setDaemon(true);
+        return thread;
+    }
+}

src/main/java/com/devcycle/sdk/server/local/managers/EnvironmentConfigManager.java

@@ -21,7 +21,7 @@
 import java.util.concurrent.TimeUnit;
 
 public final class EnvironmentConfigManager {
-  private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
+  private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1, new DaemonThreadFactory());
   private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
   private static final int DEFAULT_POLL_INTERVAL_MS = 30000;
   private static final int MIN_INTERVALS_MS = 1000;

src/main/java/com/devcycle/sdk/server/local/managers/EventQueueManager.java

@@ -24,7 +24,7 @@ public class EventQueueManager {
     private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
     private IDVCApi eventsApiClient;
     private int eventFlushIntervalMS;
-    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
+    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1, new DaemonThreadFactory());
     private boolean isFlushingEvents = false;
     private int flushEventQueueSize;
     private int maxEventQueueSize;