--- a/jdk/src/jdk.snmp/share/classes/sun/management/snmp/jvminstr/JvmMemGCTableMetaImpl.java Thu Oct 23 11:19:17 2014 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,362 +0,0 @@
-/*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code 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
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-package sun.management.snmp.jvminstr;
-
-
-// java imports
-//
-import java.io.Serializable;
-import java.util.List;
-import java.util.Map;
-import java.util.TreeMap;
-
-// jmx imports
-//
-import com.sun.jmx.snmp.SnmpOid;
-import com.sun.jmx.snmp.SnmpStatusException;
-
-// jdmk imports
-//
-import com.sun.jmx.snmp.agent.SnmpMib;
-import com.sun.jmx.snmp.agent.SnmpStandardObjectServer;
-
-import java.lang.management.MemoryManagerMXBean;
-import java.lang.management.GarbageCollectorMXBean;
-import java.lang.management.ManagementFactory;
-
-import sun.management.snmp.jvmmib.JvmMemGCTableMeta;
-import sun.management.snmp.util.SnmpCachedData;
-import sun.management.snmp.util.SnmpTableCache;
-import sun.management.snmp.util.SnmpTableHandler;
-import sun.management.snmp.util.MibLogger;
-import sun.management.snmp.util.JvmContextFactory;
-
-/**
- * The class is used for implementing the "JvmMemGCTable" table.
- */
-public class JvmMemGCTableMetaImpl extends JvmMemGCTableMeta {
-
- static final long serialVersionUID = 8250461197108867607L;
-
- /**
- * This class acts as a filter over the SnmpTableHandler
- * used for the JvmMemoryManagerTable. It filters out
- * (skip) all MemoryManagerMXBean that are not instances of
- * GarbageCollectorMXBean so that only Garbage Collectors are
- * seen. This is a better solution than relying on
- * ManagementFactory.getGarbageCollectorMXBeans() because it makes it
- * possible to guarantee the consistency betwen the MemoryManager table
- * and the GCTable since both will be sharing the same cache.
- **/
- protected static class GCTableFilter {
-
- /**
- * Returns the index that immediately follows the given
- * <var>index</var>. The returned index is strictly greater
- * than the given <var>index</var>, and is contained in the table.
- * <br>If the given <var>index</var> is null, returns the first
- * index in the table.
- * <br>If there are no index after the given <var>index</var>,
- * returns null.
- * This method is an optimization for the case where the
- * SnmpTableHandler is in fact an instance of SnmpCachedData.
- **/
- public SnmpOid getNext(SnmpCachedData datas, SnmpOid index) {
-
- final boolean dbg = log.isDebugOn();
-
- // We're going to loop until we find an instance of
- // GarbageCollectorMXBean. First we attempt to find
- // the next element whose OID follows the given index.
- // If `index' is null, the insertion point is -1
- // (the next is 0 = -insertion - 1)
- //
- final int insertion = (index==null)?-1:datas.find(index);
- if (dbg) log.debug("GCTableFilter","oid="+index+
- " at insertion="+insertion);
-
- int next;
- if (insertion > -1) next = insertion+1;
- else next = -insertion -1;
-
- // Now `next' points to the element that imediately
- // follows the given `index'. We're going to loop
- // through the table, starting at `next' (included),
- // and return the first element which is an instance
- // of GarbageCollectorMXBean.
- //
- for (;next<datas.indexes.length;next++) {
- if (dbg) log.debug("GCTableFilter","next="+next);
- final Object value = datas.datas[next];
- if (dbg) log.debug("GCTableFilter","value["+next+"]=" +
- ((MemoryManagerMXBean)value).getName());
- if (value instanceof GarbageCollectorMXBean) {
- // That's the next: return it.
- if (dbg) log.debug("GCTableFilter",
- ((MemoryManagerMXBean)value).getName() +
- " is a GarbageCollectorMXBean.");
- return datas.indexes[next];
- }
- if (dbg) log.debug("GCTableFilter",
- ((MemoryManagerMXBean)value).getName() +
- " is not a GarbageCollectorMXBean: " +
- value.getClass().getName());
- // skip to next index...
- }
- return null;
- }
-
- /**
- * Returns the index that immediately follows the given
- * <var>index</var>. The returned index is strictly greater
- * than the given <var>index</var>, and is contained in the table.
- * <br>If the given <var>index</var> is null, returns the first
- * index in the table.
- * <br>If there are no index after the given <var>index</var>,
- * returns null.
- **/
- public SnmpOid getNext(SnmpTableHandler handler, SnmpOid index) {
-
- // try to call the optimized method
- if (handler instanceof SnmpCachedData)
- return getNext((SnmpCachedData)handler, index);
-
- // too bad - revert to non-optimized generic algorithm
- SnmpOid next = index;
- do {
- next = handler.getNext(next);
- final Object value = handler.getData(next);
- if (value instanceof GarbageCollectorMXBean)
- // That's the next! return it
- return next;
- // skip to next index...
- } while (next != null);
- return null;
- }
-
- /**
- * Returns the data associated with the given index.
- * If the given index is not found, null is returned.
- * Note that returning null does not necessarily means that
- * the index was not found.
- **/
- public Object getData(SnmpTableHandler handler, SnmpOid index) {
- final Object value = handler.getData(index);
- if (value instanceof GarbageCollectorMXBean) return value;
- // Behaves as if there was nothing at this index...
- //
- return null;
- }
-
- /**
- * Returns true if the given <var>index</var> is present.
- **/
- public boolean contains(SnmpTableHandler handler, SnmpOid index) {
- if (handler.getData(index) instanceof GarbageCollectorMXBean)
- return true;
- // Behaves as if there was nothing at this index...
- //
- return false;
- }
- }
-
-
- private transient JvmMemManagerTableMetaImpl managers = null;
- private static GCTableFilter filter = new GCTableFilter();
-
-
- /**
- * Constructor for the table. Initialize metadata for "JvmMemGCTableMeta".
- */
- public JvmMemGCTableMetaImpl(SnmpMib myMib,
- SnmpStandardObjectServer objserv) {
- super(myMib,objserv);
- }
-
- // Returns a pointer to the JvmMemManager meta node - we're going
- // to reuse its SnmpTableHandler by filtering out all that is
- // not a GarbageCollectorMXBean.
- private final JvmMemManagerTableMetaImpl getManagers(SnmpMib mib) {
- if (managers == null) {
- managers = (JvmMemManagerTableMetaImpl)
- mib.getRegisteredTableMeta("JvmMemManagerTable");
- }
- return managers;
- }
-
- /**
- * Returns the JvmMemManagerTable SnmpTableHandler
- **/
- protected SnmpTableHandler getHandler(Object userData) {
- JvmMemManagerTableMetaImpl managerTable= getManagers(theMib);
- return managerTable.getHandler(userData);
- }
-
- // See com.sun.jmx.snmp.agent.SnmpMibTable
- protected SnmpOid getNextOid(Object userData)
- throws SnmpStatusException {
- // null means get the first OID.
- return getNextOid(null,userData);
- }
-
- // See com.sun.jmx.snmp.agent.SnmpMibTable
- protected SnmpOid getNextOid(SnmpOid oid, Object userData)
- throws SnmpStatusException {
- final boolean dbg = log.isDebugOn();
- try {
- if (dbg) log.debug("getNextOid", "previous=" + oid);
-
- // Get the data handler.
- //
- SnmpTableHandler handler = getHandler(userData);
- if (handler == null) {
- // This should never happen.
- // If we get here it's a bug.
- //
- if (dbg) log.debug("getNextOid", "handler is null!");
- throw new
- SnmpStatusException(SnmpStatusException.noSuchInstance);
- }
-
-
- // Get the next oid, using the GC filter.
- //
- final SnmpOid next = filter.getNext(handler,oid);
- if (dbg) log.debug("getNextOid", "next=" + next);
-
- // if next is null: we reached the end of the table.
- //
- if (next == null)
- throw new
- SnmpStatusException(SnmpStatusException.noSuchInstance);
-
- return next;
- } catch (RuntimeException x) {
- // debug. This should never happen.
- //
- if (dbg) log.debug("getNextOid",x);
- throw x;
- }
- }
-
-
- // See com.sun.jmx.snmp.agent.SnmpMibTable
- protected boolean contains(SnmpOid oid, Object userData) {
- // Get the handler.
- //
- SnmpTableHandler handler = getHandler(userData);
-
- // handler should never be null.
- //
- if (handler == null)
- return false;
- return filter.contains(handler,oid);
- }
-
- // See com.sun.jmx.snmp.agent.SnmpMibTable
- public Object getEntry(SnmpOid oid)
- throws SnmpStatusException {
-
- if (oid == null)
- throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
-
- // Get the request contextual cache (userData).
- //
- final Map<Object, Object> m = JvmContextFactory.getUserData();
-
- // First look in the request contextual cache: maybe we've already
- // created this entry...
- //
-
- // We know in the case of this table that the index is an integer,
- // it is thus the first OID arc of the index OID.
- //
- final long index = oid.getOidArc(0);
-
- // We're going to use this name to store/retrieve the entry in
- // the request contextual cache.
- //
- // Revisit: Probably better programming to put all these strings
- // in some interface.
- //
- final String entryTag = ((m==null)?null:("JvmMemGCTable.entry." +
- index));
-
- // If the entry is in the cache, simply return it.
- //
- if (m != null) {
- final Object entry = m.get(entryTag);
- if (entry != null) return entry;
- }
-
- // Entry was not in request cache. Make a new one.
- //
- // Get the data hanler.
- //
- SnmpTableHandler handler = getHandler(m);
-
- // handler should never be null.
- //
- if (handler == null)
- throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
-
- // Use the filter to retrieve only GarabageCollectorMBean data.
- //
- final Object data = filter.getData(handler,oid);
-
- // data may be null if the OID we were given is not valid.
- // (e.g. it identifies a MemoryManager which is not a
- // GarbageCollector)
- //
- if (data == null)
- throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
-
- // Make a new entryy (transient object that will be kept only
- // for the duration of the request.
- //
- final Object entry =
- new JvmMemGCEntryImpl((GarbageCollectorMXBean)data,(int)index);
-
- // Put the entry in the request cache in case we need it later
- // in the processing of the request. Note that we could have
- // optimized this by making JvmMemGCEntryImpl extend
- // JvmMemManagerEntryImpl, and then make sure that
- // JvmMemManagerTableMetaImpl creates an instance of JvmMemGCEntryImpl
- // instead of JvmMemManagerEntryImpl when the associated data is
- // an instance of GarbageCollectorMXBean. This would have made it
- // possible to share the transient entry object.
- // As it is, we may have two transient objects that points to
- // the same underlying MemoryManagerMXBean (which is definitely
- // not a problem - but is only a small dysatisfaction)
- //
- if (m != null && entry != null) {
- m.put(entryTag,entry);
- }
-
- return entry;
- }
-
- static final MibLogger log = new MibLogger(JvmMemGCTableMetaImpl.class);
-}