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 }