[GitHub] [incubator-seatunnel] ic4y commented on a diff in pull request #2472: [Engine][ResourceManager] Add ResourceManager

[GitBox <gi...@apache.org>]

ic4y commented on code in PR #2472:
URL: https://github.com/apache/incubator-seatunnel/pull/2472#discussion_r960155940


##########
seatunnel-engine/seatunnel-engine-server/src/main/java/org/apache/seatunnel/engine/server/resourcemanager/heartbeat/HeartbeatManager.java:
##########
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.seatunnel.engine.server.resourcemanager.heartbeat;
+
+import com.hazelcast.logging.ILogger;
+import com.hazelcast.logging.Logger;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+public class HeartbeatManager {
+
+    private static final ILogger LOGGER = Logger.getLogger(HeartbeatManager.class);
+
+    private static final int DEFAULT_TIMEOUT_MILLISECONDS = 5000;
+    private static final int DEFAULT_INTERVAL_MILLISECONDS = 3000;
+    private final Map<String, Long> lastHeartbeat;
+    private final HeartbeatListener listener;
+
+    public void heartbeat(String nodeID) {
+        lastHeartbeat.put(nodeID, System.currentTimeMillis());
+    }
+
+    public void removeNode(String nodeID) {
+        lastHeartbeat.remove(nodeID);
+    }
+
+    public HeartbeatManager(HeartbeatListener listener) {
+        this.listener = listener;
+        this.lastHeartbeat = new ConcurrentHashMap<>();
+    }
+
+    public void start(ScheduledExecutorService scheduledExecutorService) {
+        scheduledExecutorService.scheduleAtFixedRate(() -> {
+            lastHeartbeat.forEach((nodeID, last) -> {
+                    long now = System.currentTimeMillis();
+                    // TODO support custom timeout
+                    if (now - last > DEFAULT_TIMEOUT_MILLISECONDS) {

Review Comment:
   Yes, but if the node is offline this can depend on MembershipAwareService instead of timeout. Heartbeats just report slot status



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