FileJcmdExecutor.java revision 2224:2a8815d86b93 
1/*
2 * Copyright (c) 2015, 2016, 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
24package jdk.test.lib.dcmd;
25
26import java.io.File;
27import java.io.IOException;
28import java.io.PrintWriter;
29import java.util.Arrays;
30import 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 */
36public 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, Long.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}
82