[GitHub] [dolphinscheduler] wjf222 commented on a diff in pull request #10981: [Feature][Registry] Support etcd as registry

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

wjf222 commented on code in PR #10981:
URL: https://github.com/apache/dolphinscheduler/pull/10981#discussion_r935087863


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dolphinscheduler-registry/dolphinscheduler-registry-plugins/dolphinscheduler-registry-etcd/src/main/java/org/apache/dolphinscheduler/plugin/registry/etcd/EtcdConnectionStateListener.java:
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@@ -0,0 +1,115 @@
+/*
+ * 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.dolphinscheduler.plugin.registry.etcd;
+
+import org.apache.dolphinscheduler.registry.api.ConnectionListener;
+import org.apache.dolphinscheduler.registry.api.ConnectionState;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+
+import io.etcd.jetcd.Client;
+
+public class EtcdConnectionStateListener implements AutoCloseable {
+    private final List<ConnectionListener> connectionListeners = Collections.synchronizedList(new ArrayList<>());
+    // A thread pool that periodically obtains connection status
+    private final ScheduledExecutorService scheduledExecutorService;
+    // monitored client
+    private final Client client;
+    // The state of the last monitor
+    private ConnectionState connectionState;
+
+    public EtcdConnectionStateListener(Client client) {
+        this.client = client;
+        this.scheduledExecutorService = Executors.newScheduledThreadPool(
+                1,
+                new ThreadFactoryBuilder().setNameFormat("EtcdConnectionStateListenerThread").setDaemon(true).build());
+    }
+
+    public void addConnectionListener(ConnectionListener connectionListener) {
+        connectionListeners.add(connectionListener);
+    }
+
+    @Override
+    public void close() throws Exception {
+        connectionListeners.clear();
+        scheduledExecutorService.shutdownNow();
+    }
+
+    /**
+     * Apply for a lease through the client, if there is no exception, the connection is normal
+     * @return the current connection state
+     * @throws if there is an exception, return is DISCONNECTED
+     */
+    private ConnectionState currentConnectivityState() {
+        try {
+            client.getLeaseClient().grant(1).get().getID();
+            return ConnectionState.CONNECTED;
+        } catch (ExecutionException e) {
+            return ConnectionState.DISCONNECTED;
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            return ConnectionState.DISCONNECTED;
+        }
+    }
+
+    /**
+     * Periodically execute thread to get connection status
+     */
+    public void start() {
+        long initialDelay = 500L;

Review Comment:
   This parameter is only used inside this function and has nothing to do with etcD clusters.So I didn't make it configurable



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