[GitHub] [fluo] keith-turner commented on a change in pull request #1083: [WIP] POC for Command module with centralized Command Pattern logic

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keith-turner commented on a change in pull request #1083: [WIP] POC for Command module with centralized Command Pattern logic
URL: https://github.com/apache/fluo/pull/1083#discussion_r357761448
 
 

 ##########
 File path: modules/command/src/main/java/org/apache/fluo/command/FluoProgram.java
 ##########
 @@ -0,0 +1,125 @@
+/*
+ * 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.fluo.command;
+
+import java.util.Optional;
+
+import com.beust.jcommander.JCommander;
+import com.beust.jcommander.ParameterException;
+
+import static org.apache.fluo.command.FluoCommandType.CONFIG;
+import static org.apache.fluo.command.FluoCommandType.EXEC;
+import static org.apache.fluo.command.FluoCommandType.GET_JARS;
+import static org.apache.fluo.command.FluoCommandType.INIT;
+import static org.apache.fluo.command.FluoCommandType.LIST;
+import static org.apache.fluo.command.FluoCommandType.ORACLE;
+import static org.apache.fluo.command.FluoCommandType.REMOVE;
+import static org.apache.fluo.command.FluoCommandType.SCAN;
+import static org.apache.fluo.command.FluoCommandType.STATUS;
+import static org.apache.fluo.command.FluoCommandType.WAIT;
+import static org.apache.fluo.command.FluoCommandType.WORKER;
+
+public class FluoProgram {
+  public static void main(String[] args) {
+    FluoConfig fluoConfig = new FluoConfig();
+    FluoExec fluoExec = new FluoExec();
+    FluoGetJars fluoGetJars = new FluoGetJars();
+    FluoInit fluoInit = new FluoInit();
+    FluoList fluoList = new FluoList();
+    FluoOracle fluoOracle = new FluoOracle();
+    FluoRemove fluoRemove = new FluoRemove();
+    FluoScan fluoScan = new FluoScan();
+    FluoStatus fluoStatus = new FluoStatus();
+    FluoWait fluoWait = new FluoWait();
+    FluoWorker fluoWorker = new FluoWorker();
+    JCommander jcommand = JCommander.newBuilder().addCommand(CONFIG.getCommandName(), fluoConfig)
+        .addCommand(EXEC.getCommandName(), fluoExec)
+        .addCommand(GET_JARS.getCommandName(), fluoGetJars)
+        .addCommand(INIT.getCommandName(), fluoInit).addCommand(LIST.getCommandName(), fluoList)
+        .addCommand(ORACLE.getCommandName(), fluoOracle)
+        .addCommand(REMOVE.getCommandName(), fluoRemove).addCommand(SCAN.getCommandName(), fluoScan)
+        .addCommand(STATUS.getCommandName(), fluoStatus).addCommand(WAIT.getCommandName(), fluoWait)
+        .addCommand(WORKER.getCommandName(), fluoWorker).build();
+
+    try {
+      jcommand.parse(args);
+    } catch (ParameterException e) {
+      System.err.println(e.getMessage());
+      String commandName = Optional.ofNullable(jcommand.getParsedCommand()).orElse("");
+      JCommander parsedCommandOrProgram =
+          Optional.ofNullable(jcommand.findCommandByAlias(commandName)).orElse(jcommand);
+      parsedCommandOrProgram.setProgramName(String.format("fluo %s", commandName));
+      parsedCommandOrProgram.usage();
+      System.exit(1);
+      return;
+    }
+
+    FluoCommandType parsedCommandType = FluoCommandType.valueOf(jcommand.getParsedCommand());
+
+    FluoCommand parsedCommand;
+    switch (parsedCommandType) {
+      case CONFIG:
+        parsedCommand = fluoConfig;
+        break;
+      case EXEC:
+        parsedCommand = fluoExec;
+        break;
+      case GET_JARS:
+        parsedCommand = fluoGetJars;
+        break;
+      case INIT:
+        parsedCommand = fluoInit;
+        break;
+      case LIST:
+        parsedCommand = fluoList;
+        break;
+      case ORACLE:
+        parsedCommand = fluoOracle;
+        break;
+      case REMOVE:
+        parsedCommand = fluoRemove;
+        break;
+      case SCAN:
+        parsedCommand = fluoScan;
+        break;
+      case STATUS:
+        parsedCommand = fluoStatus;
+        break;
+      case WAIT:
+        parsedCommand = fluoWait;
+        break;
+      case WORKER:
+        parsedCommand = fluoWorker;
+        break;
+      default:
+        System.err.println("Unrecognized command");
 
 Review comment:
   ```suggestion
           System.err.println("Unrecognized command "+parsedCommandType);
   ```

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