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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/classpath/javax/management/QueryEval.java
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+/* QueryEval.java -- An evaluation context for a MBean server query.
+ Copyright (C) 2007 Free Software Foundation, Inc.
+
+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 javax.management;
+
+import java.io.Serializable;
+
+/**
+ * Represents the evaluation context of a {@link MBeanServer}
+ * query by retaining the server used on a thread-by-thread
+ * basis.
+ *
+ * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
+ * @since 1.5
+ */
+public class QueryEval
+ implements Serializable
+{
+
+ /**
+ * Compatible with JDK 1.5
+ */
+ private static final long serialVersionUID = 2675899265640874796L;
+
+ /**
+ * Stores the server used, on a
+ * thread-by-thread basis.
+ */
+ private static InheritableThreadLocal<MBeanServer> server =
+ new InheritableThreadLocal<MBeanServer>();
+
+ /**
+ * Returns the {@link MBeanServer} last supplied to the
+ * {@link #setMBeanServer(MBeanServer)} method. If this method
+ * has not been called for this thread, then the value will be
+ * inherited from any parent thread on which the method has
+ * been called. If the method has never been called, then
+ * <code>null</code> is returned.
+ *
+ * @return the server.
+ * @see #setMBeanServer(MBeanServer)
+ */
+ public static MBeanServer getMBeanServer()
+ {
+ return server.get();
+ }
+
+ /**
+ * Sets the {@link MBeanServer} on which the query will be
+ * performed. This value is inherited automatically by
+ * child threads. This method is only non-static for historical
+ * reasons; it makes no use of instance-related values.
+ *
+ * @param svr the server to use.
+ */
+ public void setMBeanServer(MBeanServer svr)
+ {
+ server.set(svr);
+ }
+
+}