jiajunwang commented on a change in pull request #653: add Helix properties 
factory and class
URL: https://github.com/apache/helix/pull/653#discussion_r366734574
 
 

 ##########
 File path: helix-core/src/main/java/org/apache/helix/HelixCloudProperty.java
 ##########
 @@ -0,0 +1,175 @@
+package org.apache.helix;
+
+/*
+ * 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.
+ */
+
+import java.io.InputStream;
+import java.util.Collections;
+import java.util.List;
+import java.util.Properties;
+import org.apache.helix.cloud.constants.CloudProvider;
+import org.apache.helix.model.CloudConfig;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * Hold helix cloud properties read from CloudConfig and user defined files. 
Clients may override the fields from their application.
+ */
+public class HelixCloudProperty {
+  private static final Logger LOG = 
LoggerFactory.getLogger(HelixCloudProperty.class.getName());
+  private static final String AZURE_CLOUD_PROPERTY_FILE = 
SystemPropertyKeys.AZURE_CLOUD_PROPERTIES;
+  private static final String CLOUD_INFO_SOURCE = "cloud_info_source";
+  private static final String CLOUD_INFO_PROCESSFOR_NAME = 
"cloud_info_processor_name";
+  private static final String CLOUD_MAX_RETRY = "cloud_max_retry";
+  private static final String CONNECTION_TIMEOUT_MS = "connection_timeout_ms";
+  private static final String REQUEST_TIMEOUT_MS = "request_timeout_ms";
+
+  // Denote whether the instance is considered as in a cloud environment.
+  private boolean _isCloudEnabled;
+
+  // Unique id of the cloud environment where the instance is in.
+  private String _cloudId;
+
+  // Cloud environment provider, e.g. Azure, AWS, GCP, etc.
+  private String _cloudProvider;
+
+  // The sources where the cloud instance information can be retrieved from.
+  private List<String> _cloudInfoSources;
+
+  // The name of the function that will fetch and parse cloud instance 
information.
+  private String _cloudInfoProcessorName;
+
+  // Http max retry times when querying the cloud instance information from 
cloud environment.
+  private int _cloudMaxRetry;
+
+  // Http connection time when querying the cloud instance information from 
cloud environment.
+  private long _cloudConnectionTimeout;
+
+  // Http request timeout when querying the cloud instance information from 
cloud environment.
+  private long _cloudRequestTimeout;
+
+  // Other customized properties that may be used.
+  private Properties _customizedCloudProperties = new Properties();
+
+  /**
+   * Initialize Helix Cloud Property based on the provider
+   * @param
+   */
+  public HelixCloudProperty(CloudConfig cloudConfig) {
+    setCloudEndabled(cloudConfig.isCloudEnabled());
+    setCloudId(cloudConfig.getCloudID());
+    setCloudProvider(cloudConfig.getCloudProvider());
+    switch (CloudProvider.valueOf(cloudConfig.getCloudProvider())) {
+      case AZURE:
+        Properties azureProperties = new Properties();
+        try {
+          InputStream stream =
+              
Thread.currentThread().getContextClassLoader().getResourceAsStream(AZURE_CLOUD_PROPERTY_FILE);
+          azureProperties.load(stream);
+        } catch (Exception e) {
+          String errMsg = "failed to open Helix Azure cloud properties file: " 
+ AZURE_CLOUD_PROPERTY_FILE;
+          throw new IllegalArgumentException(errMsg, e);
+        }
+        LOG.info("Successfully loaded Helix Azure cloud properties: " + 
azureProperties);
+        
setCloudInfoSources(Collections.singletonList(azureProperties.getProperty(CLOUD_INFO_SOURCE)));
+        
setCloudInfoProcessorName(azureProperties.getProperty(CLOUD_INFO_PROCESSFOR_NAME));
+        setCloudMaxRetry(azureProperties.getProperty(CLOUD_MAX_RETRY));
+        
setCloudConnectionTimeout(azureProperties.getProperty(CONNECTION_TIMEOUT_MS));
+        
setCloudRequestTimeout(azureProperties.getProperty(REQUEST_TIMEOUT_MS));
 
 Review comment:
   break

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