Github user nickwallen commented on a diff in the pull request:
https://github.com/apache/metron/pull/884#discussion_r158654707
--- Diff:
metron-stellar/stellar-common/src/main/java/org/apache/metron/stellar/common/shell/DefaultStellarShellExecutor.java
---
@@ -0,0 +1,398 @@
+/*
+ *
+ * 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.shell;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.google.common.collect.Maps;
+import org.apache.commons.collections.map.UnmodifiableMap;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.curator.framework.CuratorFramework;
+import org.apache.metron.stellar.common.StellarProcessor;
+import org.apache.metron.stellar.common.configuration.ConfigurationsUtils;
+import
org.apache.metron.stellar.common.shell.StellarExecutionListeners.FunctionDefinedListener;
+import
org.apache.metron.stellar.common.shell.StellarExecutionListeners.SpecialDefinedListener;
+import
org.apache.metron.stellar.common.shell.StellarExecutionListeners.VariableDefinedListener;
+import org.apache.metron.stellar.common.shell.specials.AssignmentCommand;
+import org.apache.metron.stellar.common.shell.specials.Comment;
+import org.apache.metron.stellar.common.shell.specials.DocCommand;
+import org.apache.metron.stellar.common.shell.specials.MagicDefineGlobal;
+import org.apache.metron.stellar.common.shell.specials.MagicListFunctions;
+import org.apache.metron.stellar.common.shell.specials.MagicListGlobals;
+import org.apache.metron.stellar.common.shell.specials.MagicListVariables;
+import org.apache.metron.stellar.common.shell.specials.MagicUndefineGlobal;
+import org.apache.metron.stellar.common.shell.specials.QuitCommand;
+import org.apache.metron.stellar.common.shell.specials.SpecialCommand;
+import org.apache.metron.stellar.common.utils.JSONUtils;
+import org.apache.metron.stellar.dsl.Context;
+import org.apache.metron.stellar.dsl.MapVariableResolver;
+import org.apache.metron.stellar.dsl.StellarFunctionInfo;
+import org.apache.metron.stellar.dsl.StellarFunctions;
+import org.apache.metron.stellar.dsl.VariableResolver;
+import org.apache.metron.stellar.dsl.functions.resolver.FunctionResolver;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.lang.invoke.MethodHandles;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Properties;
+
+import static
org.apache.metron.stellar.common.configuration.ConfigurationsUtils.readGlobalConfigBytesFromZookeeper;
+import static
org.apache.metron.stellar.common.shell.StellarShellResult.noop;
+import static
org.apache.metron.stellar.common.shell.StellarShellResult.error;
+import static
org.apache.metron.stellar.common.shell.StellarShellResult.success;
+import static
org.apache.metron.stellar.dsl.Context.Capabilities.GLOBAL_CONFIG;
+import static
org.apache.metron.stellar.dsl.Context.Capabilities.STELLAR_CONFIG;
+import static
org.apache.metron.stellar.dsl.Context.Capabilities.ZOOKEEPER_CLIENT;
+
+/**
+ * Default implementation of a StellarShellExecutor.
+ */
+public class DefaultStellarShellExecutor implements StellarShellExecutor {
+
--- End diff --
This class provides the core execution logic for both the REPL and
Zeppelin. It handles core Stellar in addition to the "extensions" like
assignment, magics, docstrings, etc.
---
