X-Git-Url: http://source.jalview.org/gitweb/?a=blobdiff_plain;f=src%2Fjalview%2Fbin%2FGetMemory.java;fp=src%2Fjalview%2Fbin%2FGetMemory.java;h=b01dfb8051f47b3ebae249fc875e4bd3dce15d16;hb=4898f0ae429e0c61ddba72ca46be89b34bb4df8b;hp=0000000000000000000000000000000000000000;hpb=5a6ac5b535856903629234ad43a71319a91ebee5;p=jalview.git

diff --git a/src/jalview/bin/GetMemory.java b/src/jalview/bin/GetMemory.java
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+++ b/src/jalview/bin/GetMemory.java
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+/*
+ * Jalview - A Sequence Alignment Editor and Viewer ($$Version-Rel$$)
+ * Copyright (C) $$Year-Rel$$ The Jalview Authors
+ * 
+ * This file is part of Jalview.
+ * 
+ * Jalview is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License 
+ * as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *  
+ * Jalview 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 for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with Jalview.  If not, see <http://www.gnu.org/licenses/>.
+ * The Jalview Authors are detailed in the 'AUTHORS' file.
+ */
+package jalview.bin;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.OperatingSystemMXBean;
+
+/**
+ * Isolated class to ascertain physical memory of the system using
+ * com.sun.management.OperatingSystemMXBean class's getTotalPhysicalMemorySize
+ * method. This class is present in OpenJDK 8,9,10,11,12,13. It is present but
+ * marked as deprecated in the early-access(30) release of OpenJDK 14. In case
+ * of an alternative/unsupported JRE being used or the class/method not being
+ * implemented in an exotic architecture JRE this call has been isolated into
+ * this separate class.
+ * 
+ * @author bsoares
+ *
+ */
+class GetMemory
+{
+
+  /**
+   * Wrapper for
+   * com.sun.management.OperatingSystemMXBean.getTotalPhysicalMemorySize()
+   * 
+   * @return Result of
+   *         com.sun.management.OperatingSystemMXBean.getTotalPhysicalMemorySize()
+   *         or -1 if this class is not present in the JRE.
+   */
+  protected static long getPhysicalMemory()
+  {
+    final OperatingSystemMXBean o = ManagementFactory
+            .getOperatingSystemMXBean();
+
+    try
+    {
+      if (o instanceof com.sun.management.OperatingSystemMXBean)
+      {
+        final com.sun.management.OperatingSystemMXBean osb = (com.sun.management.OperatingSystemMXBean) o;
+        return osb.getTotalPhysicalMemorySize();
+      }
+    } catch (NoClassDefFoundError e)
+    {
+      // com.sun.management.OperatingSystemMXBean doesn't exist in this JVM
+      System.err.println(
+              "No com.sun.management.OperatingSystemMXBean: cannot get total physical memory size");
+    }
+
+    // We didn't get a com.sun.management.OperatingSystemMXBean.
+    return -1;
+  }
+
+}