| /* |
| * 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.karaf.shell.commands; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.PrintStream; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.TimeUnit; |
| import org.apache.felix.gogo.commands.Argument; |
| import org.apache.felix.gogo.commands.Command; |
| import org.apache.felix.gogo.commands.Option; |
| import org.apache.felix.service.command.CommandProcessor; |
| import org.apache.felix.service.command.CommandSession; |
| import org.apache.karaf.shell.console.AbstractAction; |
| |
| @Command(scope = "shell", name = "command-watch", description = "Watches & refreshes the output of a command") |
| public class WatchAction extends AbstractAction { |
| |
| @Option(name = "-n", aliases = {"--interval"}, description = "The interval between executions of the command in seconds", required = false, multiValued = false) |
| private long interval = 1; |
| |
| @Argument(index = 0, name = "command", description = "The command to watch / refresh", required = true, multiValued = true) |
| private String[] arguments; |
| |
| CommandProcessor commandProcessor; |
| private ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor(); |
| |
| @Override |
| protected Object doExecute() throws Exception { |
| if (arguments == null || arguments.length == 0) { |
| System.err.println("Argument expected"); |
| return null; |
| } else { |
| StringBuilder command = new StringBuilder(); |
| for (String arg:arguments) { |
| command.append(arg).append(" "); |
| } |
| WatchTask watchTask = new WatchTask(commandProcessor, command.toString().trim()); |
| executorService.scheduleAtFixedRate(watchTask, 0, interval, TimeUnit.SECONDS); |
| try { |
| session.getKeyboard().read(); |
| } finally { |
| executorService.shutdownNow(); |
| watchTask.close(); |
| return null; |
| } |
| } |
| } |
| |
| public class WatchTask implements Runnable { |
| |
| private final CommandProcessor processor; |
| private final String command; |
| |
| CommandSession session; |
| ByteArrayOutputStream byteArrayOutputStream = null; |
| PrintStream printStream = null; |
| |
| public WatchTask(CommandProcessor processor, String command) { |
| this.processor = processor; |
| this.command = command; |
| } |
| |
| public void run() { |
| try { |
| byteArrayOutputStream = new ByteArrayOutputStream(); |
| printStream = new PrintStream(byteArrayOutputStream); |
| session = commandProcessor.createSession(null, printStream, printStream); |
| String output = ""; |
| session.execute(command); |
| output = byteArrayOutputStream.toString(); |
| System.out.print("\33[2J"); |
| System.out.print("\33[1;1H"); |
| System.out.print(output); |
| System.out.flush(); |
| byteArrayOutputStream.close(); |
| session.close(); |
| } catch (Exception e) { |
| //Ingore |
| } |
| } |
| |
| public void close() throws IOException { |
| if (this.session != null) { |
| this.session.close(); |
| } |
| if (this.byteArrayOutputStream != null) { |
| this.byteArrayOutputStream.close(); |
| } |
| if (this.printStream != null) { |
| printStream.close(); |
| } |
| } |
| } |
| |
| public CommandProcessor getCommandProcessor() { |
| return commandProcessor; |
| } |
| |
| public void setCommandProcessor(CommandProcessor commandProcessor) { |
| this.commandProcessor = commandProcessor; |
| } |
| } |