--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/test/lib/testlibrary/jdk/testlibrary/dcmd/CommandExecutor.java	2019-01-29 11:05:46.514848032 +0800
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.testlibrary.dcmd;
+
+import jdk.testlibrary.OutputAnalyzer;
+
+/**
+ * Abstract base class for Diagnostic Command executors
+ */
+public abstract class CommandExecutor {
+
+    /**
+     * Execute a diagnostic command
+     *
+     * @param cmd The diagnostic command to execute
+     * @return an {@link jdk.testlibrary.OutputAnalyzer} encapsulating the output of the command
+     * @throws CommandExecutorException if there is an exception on the "calling side" while trying to execute the
+     *          Diagnostic Command. Exceptions thrown on the remote side are available as textual representations in
+     *          stderr, regardless of the specific executor used.
+     */
+    public final OutputAnalyzer execute(String cmd) throws CommandExecutorException {
+        return execute(cmd, false);
+    }
+
+    /**
+     * Execute a diagnostic command
+     *
+     * @param cmd The diagnostic command to execute
+     * @param silent Do not print the command output
+     * @return an {@link jdk.testlibrary.OutputAnalyzer} encapsulating the output of the command
+     * @throws CommandExecutorException if there is an exception on the "calling side" while trying to execute the
+     *          Diagnostic Command. Exceptions thrown on the remote side are available as textual representations in
+     *          stderr, regardless of the specific executor used.
+     */
+    public final OutputAnalyzer execute(String cmd, boolean silent) throws CommandExecutorException {
+        if (!silent) {
+            System.out.printf("Running DCMD '%s' through '%s'%n", cmd, this.getClass().getSimpleName());
+        }
+
+        OutputAnalyzer oa = executeImpl(cmd);
+
+        if (!silent) {
+            System.out.println("---------------- stdout ----------------");
+            System.out.println(oa.getStdout());
+            System.out.println("---------------- stderr ----------------");
+            System.out.println(oa.getStderr());
+            System.out.println("----------------------------------------");
+            System.out.println();
+        }
+        return oa;
+    }
+
+    protected abstract OutputAnalyzer executeImpl(String cmd) throws CommandExecutorException;
+}