changeset 47754:fa213afbaadb

8044122: MBean access to the PID Summary: Added new API getPid for getting process ID Reviewed-by: mchung, rriggs Contributed-by: ujwal.vangapally@oracle.com
author uvangapally
date Tue, 07 Nov 2017 22:05:44 -0800
parents b6c19518372e
children 57752bd5d1b4
files src/java.management/share/classes/java/lang/management/RuntimeMXBean.java test/jdk/java/lang/management/RuntimeMXBean/ProcessIdTest.java
diffstat 2 files changed, 68 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/src/java.management/share/classes/java/lang/management/RuntimeMXBean.java	Tue Nov 07 23:18:16 2017 +0100
+++ b/src/java.management/share/classes/java/lang/management/RuntimeMXBean.java	Tue Nov 07 22:05:44 2017 -0800
@@ -25,6 +25,9 @@
 
 package java.lang.management;
 
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
 /**
  * The management interface for the runtime system of
  * the Java virtual machine.
@@ -61,6 +64,22 @@
  */
 public interface RuntimeMXBean extends PlatformManagedObject {
     /**
+     * Returns the {@linkplain ProcessHandle#pid process ID} representing
+     * the running Java virtual machine.
+     *
+     * @implSpec The default implementation returns {@link ProcessHandle#pid process ID}
+     * of the {@linkplain ProcessHandle#current current process}.
+     *
+     * @return the process ID representing the running Java virtual machine.
+     *
+     * @since 10
+     */
+    public default long getPid() {
+        return AccessController.doPrivileged((PrivilegedAction<Long>)
+                () -> ProcessHandle.current().pid());
+    }
+
+    /**
      * Returns the name representing the running Java virtual machine.
      * The returned name string can be any arbitrary string and
      * a Java virtual machine implementation can choose
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/lang/management/RuntimeMXBean/ProcessIdTest.java	Tue Nov 07 22:05:44 2017 -0800
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+/*
+ * @test
+ * @bug 8044122
+ * @summary check the correctness of process ID returned by RuntimeMXBean.getPid()
+ * @run main ProcessIdTest
+ */
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.RuntimeMXBean;
+import java.lang.ProcessHandle;
+
+public class ProcessIdTest {
+    public static void main(String args[]) {
+        RuntimeMXBean mbean = ManagementFactory.getRuntimeMXBean();
+        long mbeanPid = mbean.getPid();
+        long pid = ProcessHandle.current().pid();
+        long pid1 = Long.parseLong(mbean.getName().split("@")[0]);
+        if(mbeanPid != pid || mbeanPid != pid1) {
+            throw new RuntimeException("Incorrect process ID returned");
+        }
+
+        System.out.println("Test Passed");
+    }
+
+}
+