| /* |
| * 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.nifi.bootstrap; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.net.Socket; |
| import java.nio.charset.StandardCharsets; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.TimeUnit; |
| |
| public class ShutdownHook extends Thread { |
| |
| private final Process nifiProcess; |
| private final RunNiFi runner; |
| private final int gracefulShutdownSeconds; |
| private final ExecutorService executor; |
| |
| private volatile String secretKey; |
| |
| public ShutdownHook(final Process nifiProcess, final RunNiFi runner, final String secretKey, final int gracefulShutdownSeconds, final ExecutorService executor) { |
| this.nifiProcess = nifiProcess; |
| this.runner = runner; |
| this.secretKey = secretKey; |
| this.gracefulShutdownSeconds = gracefulShutdownSeconds; |
| this.executor = executor; |
| } |
| |
| void setSecretKey(final String secretKey) { |
| this.secretKey = secretKey; |
| } |
| |
| @Override |
| public void run() { |
| executor.shutdown(); |
| runner.setAutoRestartNiFi(false); |
| final int ccPort = runner.getNiFiCommandControlPort(); |
| if (ccPort > 0) { |
| System.out.println("Initiating Shutdown of NiFi..."); |
| |
| try { |
| final Socket socket = new Socket("localhost", ccPort); |
| final OutputStream out = socket.getOutputStream(); |
| out.write(("SHUTDOWN " + secretKey + "\n").getBytes(StandardCharsets.UTF_8)); |
| out.flush(); |
| |
| socket.close(); |
| } catch (final IOException ioe) { |
| System.out.println("Failed to Shutdown NiFi due to " + ioe); |
| } |
| } |
| |
| runner.notifyStop(); |
| System.out.println("Waiting for Apache NiFi to finish shutting down..."); |
| final long startWait = System.nanoTime(); |
| while (RunNiFi.isAlive(nifiProcess)) { |
| final long waitNanos = System.nanoTime() - startWait; |
| final long waitSeconds = TimeUnit.NANOSECONDS.toSeconds(waitNanos); |
| if (waitSeconds >= gracefulShutdownSeconds && gracefulShutdownSeconds > 0) { |
| if (RunNiFi.isAlive(nifiProcess)) { |
| System.out.println("NiFi has not finished shutting down after " + gracefulShutdownSeconds + " seconds. Killing process."); |
| nifiProcess.destroy(); |
| } |
| break; |
| } else { |
| try { |
| Thread.sleep(1000L); |
| } catch (final InterruptedException ie) { |
| } |
| } |
| } |
| |
| final File statusFile = runner.getStatusFile(); |
| if (!statusFile.delete()) { |
| System.err.println("Failed to delete status file " + statusFile.getAbsolutePath() + "; this file should be cleaned up manually"); |
| } |
| } |
| } |