* src/lib/Makefile.am (VM_JAVA_FILES): Renamed vm/reference/ to gnu/.

[cacao.git] / src / lib / gnu / gnu / java / lang / management / VMMemoryMXBeanImpl.java

diff --git a/src/lib/gnu/gnu/java/lang/management/VMMemoryMXBeanImpl.java b/src/lib/gnu/gnu/java/lang/management/VMMemoryMXBeanImpl.java
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+/* VMMemoryMXBeanImpl.java - VM impl. of a memory bean
+   Copyright (C) 2006 Free Software Foundation
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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 2, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package gnu.java.lang.management;
+
+import java.lang.management.MemoryUsage;
+
+/**
+ * Provides access to information about the memory
+ * management of the current invocation of the virtual
+ * machine.  Instances of this bean are obtained by calling
+ * {@link ManagementFactory#getMemoryMXBean()}.
+ *
+ * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
+ * @since 1.5
+ */
+final class VMMemoryMXBeanImpl
+{
+
+  /**
+   * Returns an instance of {@link java.lang.management.MemoryUsage}
+   * with appropriate initial, used, committed and maximum values
+   * for the heap.  By default, this uses the methods of
+   * {@link java.lang.Runtime} to provide some of the values.
+   *
+   * @return an {@link java.lang.management.MemoryUsage} instance
+   *         for the heap.
+   */
+//   static MemoryUsage getHeapMemoryUsage()
+//   {
+//     Runtime runtime = Runtime.getRuntime();
+//     long totalMem = runtime.totalMemory();
+//     return new MemoryUsage(-1, totalMem - runtime.freeMemory(),
+//                        totalMem, runtime.maxMemory());
+//   }
+  static native MemoryUsage getHeapMemoryUsage();
+
+  /**
+   * Returns an instance of {@link java.lang.management.MemoryUsage}
+   * with appropriate initial, used, committed and maximum values
+   * for non-heap memory.
+   *
+   * @return an {@link java.lang.management.MemoryUsage} instance
+   *         for non-heap memory.
+   */
+  static native MemoryUsage getNonHeapMemoryUsage();
+
+  /**
+   * Returns the number of objects ready to be garbage collected.
+   *
+   * @return the number of finalizable objects.
+   */
+  static native int getObjectPendingFinalizationCount();
+
+  /**
+   * Returns true if the virtual machine will emit additional
+   * information when memory is allocated and deallocated.  The
+   * format of the output is left up to the virtual machine.
+   *
+   * @return true if verbose class loading output is on.
+   */
+  static native boolean isVerbose();
+
+  /**
+   * Turns on or off the emission of additional information
+   * when memory is allocated and deallocated.  The format of the
+   * output is left up to the virtual machine.  This method
+   * may be called by multiple threads concurrently, but there
+   * is only one global setting of verbosity that is affected.
+   *
+   * @param verbose the new setting for verbose class loading
+   *                output.
+   */
+  static native void setVerbose(boolean verbose);
+
+}