Github user nickwallen commented on a diff in the pull request:
https://github.com/apache/metron/pull/856#discussion_r158583416
--- Diff:
metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/common/utils/validation/StellarZookeeperBasedValidator.java
---
@@ -0,0 +1,106 @@
+/*
+ *
+ * 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.metron.stellar.common.utils.validation;
+
+import static
org.apache.metron.stellar.common.shell.StellarShell.ERROR_PROMPT;
+
+import java.lang.invoke.MethodHandles;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import org.apache.commons.lang.NullArgumentException;
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.metron.stellar.common.StellarProcessor;
+import org.atteo.classindex.ClassIndex;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class StellarZookeeperBasedValidator implements StellarValidator {
+
+ private static final Logger LOG =
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
+ private static final String FAILED_COMPILE = "Failed to compile";
+ private CuratorFramework client;
+
+ public StellarZookeeperBasedValidator(CuratorFramework client) throws
NullArgumentException {
+ if (client == null) {
+ throw new NullArgumentException("client");
+ }
+ this.client = client;
+ }
+
+
+ @Override
+ public Iterable<ValidationResult> validate(Optional<LineWriter> writer) {
+ // discover all the StellarConfigurationProvider
+ Set<StellarConfigurationProvider> providerSet = new HashSet<>();
+
+ for (Class<?> c :
ClassIndex.getSubclasses(StellarConfigurationProvider.class,
--- End diff --
What is the following code block doing? Why do we need to discover all of
the StellarConfigurationProvider classes?
---
