Merge branch 'libs/jetty/local'

[gigi.git] / lib / jetty / org / eclipse / jetty / util / Uptime.java

diff --git a/lib/jetty/org/eclipse/jetty/util/Uptime.java b/lib/jetty/org/eclipse/jetty/util/Uptime.java
new file mode 100644 (file)
index 0000000..9daa525
--- /dev/null
+++ b/lib/jetty/org/eclipse/jetty/util/Uptime.java
@@ -0,0 +1,132 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.util;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+
+/**
+ * Provide for a Uptime class that is compatible with Android, GAE, and the new Java 8 compact profiles
+ */
+public class Uptime
+{
+    public static final int NOIMPL = -1;
+
+    public static interface Impl
+    {
+        public long getUptime();
+    }
+
+    public static class DefaultImpl implements Impl
+    {
+        public Object mxBean;
+        public Method uptimeMethod;
+
+        public DefaultImpl()
+        {
+            ClassLoader cl = Thread.currentThread().getContextClassLoader();
+            try
+            {
+                Class<?> mgmtFactory = Class.forName("java.lang.management.ManagementFactory",true,cl);
+                Class<?> runtimeClass = Class.forName("java.lang.management.RuntimeMXBean",true,cl);
+                Class<?> noparams[] = new Class<?>[0];
+                Method mxBeanMethod = mgmtFactory.getMethod("getRuntimeMXBean",noparams);
+                if (mxBeanMethod == null)
+                {
+                    throw new UnsupportedOperationException("method getRuntimeMXBean() not found");
+                }
+                mxBean = mxBeanMethod.invoke(mgmtFactory);
+                if (mxBean == null)
+                {
+                    throw new UnsupportedOperationException("getRuntimeMXBean() method returned null");
+                }
+                uptimeMethod = runtimeClass.getMethod("getUptime",noparams);
+                if (mxBean == null)
+                {
+                    throw new UnsupportedOperationException("method getUptime() not found");
+                }
+            }
+            catch (ClassNotFoundException | 
+                   NoClassDefFoundError | 
+                   NoSuchMethodException | 
+                   SecurityException | 
+                   IllegalAccessException | 
+                   IllegalArgumentException | 
+                   InvocationTargetException e)
+            {
+                throw new UnsupportedOperationException("Implementation not available in this environment",e);
+            }
+        }
+
+        @Override
+        public long getUptime()
+        {
+            try
+            {
+                return (long)uptimeMethod.invoke(mxBean);
+            }
+            catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e)
+            {
+                return NOIMPL;
+            }
+        }
+    }
+
+    private static final Uptime INSTANCE = new Uptime();
+
+    public static Uptime getInstance()
+    {
+        return INSTANCE;
+    }
+
+    private Impl impl;
+
+    private Uptime()
+    {
+        try
+        {
+            impl = new DefaultImpl();
+        }
+        catch (UnsupportedOperationException e)
+        {
+            System.err.printf("Defaulting Uptime to NOIMPL due to (%s) %s%n",e.getClass().getName(),e.getMessage());
+            impl = null;
+        }
+    }
+
+    public Impl getImpl()
+    {
+        return impl;
+    }
+
+    public void setImpl(Impl impl)
+    {
+        this.impl = impl;
+    }
+
+    public static long getUptime()
+    {
+        Uptime u = getInstance();
+        if (u == null || u.impl == null)
+        {
+            return NOIMPL;
+        }
+        return u.impl.getUptime();
+    }
+}