[GitHub] [shardingsphere] menghaoranss commented on a change in pull request #5795: Proxy handle heart beat event #control-panel-cluster

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

menghaoranss commented on a change in pull request #5795:
URL: https://github.com/apache/shardingsphere/pull/5795#discussion_r430141942



##########
File path: shardingsphere-proxy/shardingsphere-proxy-backend/src/main/java/org/apache/shardingsphere/proxy/backend/cluster/HeartbeatHandler.java
##########
@@ -0,0 +1,121 @@
+/*
+ * 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.shardingsphere.proxy.backend.cluster;
+
+import com.google.common.base.Preconditions;
+import org.apache.shardingsphere.cluster.configuration.config.HeartbeatConfiguration;
+
+import org.apache.shardingsphere.cluster.facade.ClusterFacade;
+import org.apache.shardingsphere.cluster.heartbeat.response.HeartbeatResponse;
+import org.apache.shardingsphere.cluster.heartbeat.response.HeartbeatResult;
+import org.apache.shardingsphere.proxy.backend.schema.ShardingSphereSchema;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Arrays;
+import java.util.Objects;
+import java.util.Collection;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.FutureTask;
+import java.util.concurrent.ExecutionException;
+import java.util.stream.Collectors;
+
+/**
+ * Heart beat handler.
+ */
+public final class HeartbeatHandler {
+    
+    private HeartbeatConfiguration configuration;
+    
+    /**
+     * Init heart beat handler.
+     *
+     * @param configuration heart beat configuration
+     */
+    public void init(final HeartbeatConfiguration configuration) {
+        Preconditions.checkNotNull(configuration, "heart beat configuration can not be null.");
+        this.configuration = configuration;
+    }
+    
+    /**
+     * Get heart beat handler instance.
+     *
+     * @return heart beat handler instance
+     */
+    public static HeartbeatHandler getInstance() {
+        return HeartbeatHandlerHolder.INSTANCE;
+    }
+    
+    /**
+     * Handle heart beat detect event.
+     *
+     * @param schemas ShardingSphere schemas
+     */
+    public void handle(final Map<String, ShardingSphereSchema> schemas) {
+        ExecutorService executorService = Executors.newFixedThreadPool(countDataSource(schemas));
+        List<FutureTask<Map<String, HeartbeatResult>>> futureTasks = new ArrayList<>();
+        schemas.values().forEach(value -> value.getBackendDataSource().getDataSources().entrySet().forEach(entry -> {
+            FutureTask<Map<String, HeartbeatResult>> futureTask = new FutureTask<>(new HeartbeatDetect(value.getName(), entry.getKey(),
+                    entry.getValue(), configuration));
+            futureTasks.add(futureTask);
+            executorService.submit(futureTask);
+        }));
+        reportHeartbeat(futureTasks);
+        closeExecutor(executorService);
+    }
+    
+    private Integer countDataSource(final Map<String, ShardingSphereSchema> schemas) {
+        return Long.valueOf(schemas.values().stream().
+                collect(Collectors.summarizingInt(entry -> entry.getBackendDataSource().
+                        getDataSources().keySet().size())).getSum()).intValue();
+    }
+    
+    private void reportHeartbeat(final List<FutureTask<Map<String, HeartbeatResult>>> futureTasks) {
+        Map<String, Collection<HeartbeatResult>> heartbeatResultMap = new HashMap<>();
+        futureTasks.stream().forEach(each -> {
+            try {
+                each.get().entrySet().forEach(entry -> {
+                    if (Objects.isNull(heartbeatResultMap.get(entry.getKey()))) {
+                        heartbeatResultMap.put(entry.getKey(), new ArrayList<>(Arrays.asList(entry.getValue())));
+                    } else {
+                        heartbeatResultMap.get(entry.getKey()).add(entry.getValue());
+                    }
+                });
+            } catch (InterruptedException ex) {
+            

Review comment:
       got it.




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