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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/gnu/java/lang/management/VMMemoryPoolMXBeanImpl.java
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+/* MemoryPoolMXBeanImpl.java - VM interface for memory pool beans
+ 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 on the memory resources or
+ * pools used by the current invocation of the virtual machine.
+ *
+ * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
+ * @since 1.5
+ */
+final class VMMemoryPoolMXBeanImpl
+{
+
+ /**
+ * Returns memory usage statistics for the specified pool
+ * just after a best-effort attempt to free memory. This
+ * is valid only for certain garbage collectors.
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return a {@link java.lang.management.MemoryUsage} object
+ * containing the statistics or <code>null</code>
+ * if this pool does not support such statistics.
+ */
+ static native MemoryUsage getCollectionUsage(String name);
+
+ /**
+ * Returns the collection usage threshold for the specified pool.
+ * This is only called if this functionality is supported
+ * by the virtual machine (i.e. the appropriate property,
+ * <code>gnu.java.lang.management.CollectionUsageThresholdSupport</code>,
+ * is defined). The value is initially zero.
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return the collection usage threshold.
+ */
+ static native long getCollectionUsageThreshold(String name);
+
+ /**
+ * Returns the number of times the collection usage threshold
+ * has been met or exceeded by the specified pool.
+ * This is only called if this functionality is supported
+ * by the virtual machine (i.e. the appropriate property,
+ * <code>gnu.java.lang.management.CollectionUsageThresholdSupport</code>,
+ * is defined).
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return the collection usage threshold count.
+ */
+ static native long getCollectionUsageThresholdCount(String name);
+
+ /**
+ * Returns an array of names of memory managers which manage
+ * the specified pool.
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return a list of memory managers for the pool.
+ */
+ static native String[] getMemoryManagerNames(String name);
+
+ /**
+ * Returns the peak usage level of the specified pool.
+ * This is only called if the pool is valid.
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return a {@link java.lang.management.MemoryUsage} object
+ * containing the statistics.
+ */
+ static native MemoryUsage getPeakUsage(String name);
+
+ /**
+ * Returns the type of memory used by the specified pool.
+ * The value must be either "HEAP" or "NON_HEAP".
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return the type of the given pool.
+ */
+ static native String getType(String name);
+
+ /**
+ * Returns the current usage level of the specified pool.
+ * This is only called if the pool is valid.
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return a {@link java.lang.management.MemoryUsage} object
+ * containing the statistics.
+ */
+ static native MemoryUsage getUsage(String name);
+
+ /**
+ * Returns the usage threshold for the specified pool.
+ * This is only called if this functionality is supported
+ * by the virtual machine (i.e. the appropriate property,
+ * <code>gnu.java.lang.management.UsageThresholdSupport</code>,
+ * is defined). The value is initially defined by the
+ * virtual machine.
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return the usage threshold.
+ */
+ static native long getUsageThreshold(String name);
+
+ /**
+ * Returns the number of times the usage threshold
+ * has been met or exceeded by the specified pool.
+ * This is only called if this functionality is supported
+ * by the virtual machine (i.e. the appropriate property,
+ * <code>gnu.java.lang.management.UsageThresholdSupport</code>,
+ * is defined).
+ *
+ * @param name the name of the pool to obtain statistics on.
+ * @return the usage threshold count.
+ */
+ static native long getUsageThresholdCount(String name);
+
+ /**
+ * Returns true if the specified pool is still valid i.e.
+ * it is still in use by the virtual machine.
+ *
+ * @param name the name of the pool to check the validity of.
+ * @return true if the pool is valid.
+ */
+ static native boolean isValid(String name);
+
+ /**
+ * Resets the peak usage level to the current usage level for
+ * the specified pool.
+ *
+ * @param name the name of the pool to reset the peak usage of.
+ */
+ static native void resetPeakUsage(String name);
+
+ /**
+ * Sets the collection usage threshold for the specified
+ * pool to the supplied value.
+ * This is only called if this functionality is supported
+ * by the virtual machine (i.e. the appropriate property,
+ * <code>gnu.java.lang.management.CollectionUsageThresholdSupport</code>,
+ * is defined).
+ *
+ * @param name the name of the pool to set the threshold of.
+ * @param threshold the new threshold level.
+ */
+ static native void setCollectionUsageThreshold(String name, long threshold);
+
+ /**
+ * Sets the usage threshold for the specified pool to the supplied value.
+ * This is only called if this functionality is supported
+ * by the virtual machine (i.e. the appropriate property,
+ * <code>gnu.java.lang.management.UsageThresholdSupport</code>,
+ * is defined).
+ *
+ * @param name the name of the pool to set the threshold of.
+ * @param threshold the new threshold level.
+ */
+ static native void setUsageThreshold(String name, long threshold);
+
+}