1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package com.oracle.java.testlibrary.dcmd; 25 26 import java.io.File; 27 import java.io.IOException; 28 import java.io.PrintWriter; 29 import java.util.Arrays; 30 import java.util.List; 31 32 /** 33 * Executes Diagnostic Commands on the target VM (specified by pid) using the jcmd tool and its ability to read 34 * Diagnostic Commands from a file. 35 */ 36 public class FileJcmdExecutor extends PidJcmdExecutor { 37 38 /** 39 * Instantiates a new FileJcmdExecutor targeting the current VM 40 */ 41 public FileJcmdExecutor() { 42 super(); 43 } 44 45 /** 46 * Instantiates a new FileJcmdExecutor targeting the VM indicated by the given pid 47 * 48 * @param target Pid of the target VM 49 */ 50 public FileJcmdExecutor(String target) { 51 super(target); 52 } 53 54 protected List<String> createCommandLine(String cmd) throws CommandExecutorException { 55 File cmdFile = createTempFile(); 56 writeCommandToTemporaryFile(cmd, cmdFile); 57 58 return Arrays.asList(jcmdBinary, Integer.toString(pid), 59 "-f", cmdFile.getAbsolutePath()); 60 } 61 62 private void writeCommandToTemporaryFile(String cmd, File cmdFile) { 63 try (PrintWriter pw = new PrintWriter(cmdFile)) { 64 pw.println(cmd); 65 } catch (IOException e) { 66 String message = "Could not write to file: " + cmdFile.getAbsolutePath(); 67 throw new CommandExecutorException(message, e); 68 } 69 } 70 71 private File createTempFile() { 72 try { 73 File cmdFile = File.createTempFile("input", "jcmd"); 74 cmdFile.deleteOnExit(); 75 return cmdFile; 76 } catch (IOException e) { 77 throw new CommandExecutorException("Could not create temporary file", e); 78 } 79 } 80 81 }