524 lines
19 KiB
Java
524 lines
19 KiB
Java
/*
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* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.management.snmp.jvminstr;
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// java imports
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//
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import com.sun.jmx.mbeanserver.Util;
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import java.io.Serializable;
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import java.util.List;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.HashMap;
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import java.util.TreeMap;
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import java.util.Collections;
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// jmx imports
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//
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import javax.management.MBeanServer;
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import javax.management.ObjectName;
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import com.sun.jmx.snmp.SnmpOid;
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import com.sun.jmx.snmp.SnmpStatusException;
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// jdmk imports
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//
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import com.sun.jmx.snmp.agent.SnmpMib;
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import com.sun.jmx.snmp.agent.SnmpStandardObjectServer;
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import com.sun.jmx.snmp.agent.SnmpMibTable;
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import java.lang.management.MemoryManagerMXBean;
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import java.lang.management.MemoryPoolMXBean;
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import sun.management.snmp.jvmmib.JvmMemMgrPoolRelTableMeta;
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import sun.management.snmp.util.SnmpTableCache;
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import sun.management.snmp.util.SnmpCachedData;
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import sun.management.snmp.util.SnmpTableHandler;
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import sun.management.snmp.util.MibLogger;
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import sun.management.snmp.util.JvmContextFactory;
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/**
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* The class is used for implementing the "JvmMemMgrPoolRelTable" group.
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*/
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public class JvmMemMgrPoolRelTableMetaImpl extends JvmMemMgrPoolRelTableMeta
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implements Serializable {
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static final long serialVersionUID = 1896509775012355443L;
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/**
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* A concrete implementation of {@link SnmpTableCache}, for the
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* jvmMemMgrPoolRelTable.
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**/
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private static class JvmMemMgrPoolRelTableCache
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extends SnmpTableCache {
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static final long serialVersionUID = 6059937161990659184L;
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final private JvmMemMgrPoolRelTableMetaImpl meta;
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/**
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* Create a weak cache for the jvmMemMgrPoolRelTable.
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* @param validity validity of the cached data, in ms.
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**/
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JvmMemMgrPoolRelTableCache(JvmMemMgrPoolRelTableMetaImpl meta,
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long validity) {
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this.validity = validity;
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this.meta = meta;
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}
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/**
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* Call <code>getTableDatas(JvmContextFactory.getUserData())</code>.
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**/
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public SnmpTableHandler getTableHandler() {
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final Map<Object,Object> userData = JvmContextFactory.getUserData();
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return getTableDatas(userData);
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}
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/**
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* Builds a map pool-name => pool-index from the SnmpTableHandler
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* of the JvmMemPoolTable.
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**/
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private static Map<String, SnmpOid> buildPoolIndexMap(SnmpTableHandler handler) {
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// optimization...
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if (handler instanceof SnmpCachedData)
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return buildPoolIndexMap((SnmpCachedData)handler);
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// not optimizable... too bad.
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final Map<String, SnmpOid> m = new HashMap<>();
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SnmpOid index=null;
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while ((index = handler.getNext(index))!=null) {
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final MemoryPoolMXBean mpm =
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(MemoryPoolMXBean)handler.getData(index);
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if (mpm == null) continue;
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final String name = mpm.getName();
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if (name == null) continue;
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m.put(name,index);
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}
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return m;
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}
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/**
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* Builds a map pool-name => pool-index from the SnmpTableHandler
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* of the JvmMemPoolTable.
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* Optimized algorithm.
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**/
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private static Map<String, SnmpOid> buildPoolIndexMap(SnmpCachedData cached) {
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if (cached == null) return Collections.emptyMap();
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final SnmpOid[] indexes = cached.indexes;
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final Object[] datas = cached.datas;
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final int len = indexes.length;
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final Map<String, SnmpOid> m = new HashMap<>(len);
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for (int i=0; i<len; i++) {
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final SnmpOid index = indexes[i];
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if (index == null) continue;
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final MemoryPoolMXBean mpm =
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(MemoryPoolMXBean)datas[i];
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if (mpm == null) continue;
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final String name = mpm.getName();
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if (name == null) continue;
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m.put(name,index);
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}
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return m;
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}
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/**
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* Return a table handler that holds the jvmMemManagerTable table data.
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* This method return the cached table data if it is still
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* valid, recompute it and cache the new value if it's not.
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* If it needs to recompute the cached data, it first
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* try to obtain the list of memory managers from the request
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* contextual cache, and if it is not found, it calls
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* <code>ManagementFactory.getMemoryMBean().getMemoryManagers()</code>
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* and caches the value.
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* This ensures that
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* <code>ManagementFactory.getMemoryMBean().getMemoryManagers()</code>
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* is not called more than once per request, thus ensuring a
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* consistent view of the table.
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**/
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protected SnmpCachedData updateCachedDatas(Object userData) {
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// Get the MemoryManager table
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final SnmpTableHandler mmHandler =
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meta.getManagerHandler(userData);
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// Get the MemoryPool table
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final SnmpTableHandler mpHandler =
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meta.getPoolHandler(userData);
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// Time stamp for the cache
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final long time = System.currentTimeMillis();
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// Build a Map poolname -> index
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final Map<String,SnmpOid> poolIndexMap = buildPoolIndexMap(mpHandler);
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// For each memory manager, get the list of memory pools
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// For each memory pool, find its index in the memory pool table
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// Create a row in the relation table.
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final TreeMap<SnmpOid, Object> table =
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new TreeMap<>(SnmpCachedData.oidComparator);
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updateTreeMap(table,userData,mmHandler,mpHandler,poolIndexMap);
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return new SnmpCachedData(time,table);
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}
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/**
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* Get the list of memory pool associated with the
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* given MemoryManagerMXBean.
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**/
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protected String[] getMemoryPools(Object userData,
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MemoryManagerMXBean mmm, long mmarc) {
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final String listTag =
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"JvmMemManager." + mmarc + ".getMemoryPools";
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String[] result=null;
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if (userData instanceof Map) {
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result = (String[])((Map)userData).get(listTag);
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if (result != null) return result;
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}
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if (mmm!=null) {
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result = mmm.getMemoryPoolNames();
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}
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if ((result!=null)&&(userData instanceof Map)) {
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Map<Object, Object> map = Util.cast(userData);
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map.put(listTag,result);
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}
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return result;
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}
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protected void updateTreeMap(TreeMap<SnmpOid, Object> table, Object userData,
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MemoryManagerMXBean mmm,
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SnmpOid mmIndex,
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Map<String, SnmpOid> poolIndexMap) {
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// The MemoryManager index is an int, so it's the first
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// and only subidentifier.
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final long mmarc;
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try {
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mmarc = mmIndex.getOidArc(0);
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} catch (SnmpStatusException x) {
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log.debug("updateTreeMap",
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"Bad MemoryManager OID index: "+mmIndex);
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log.debug("updateTreeMap",x);
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return;
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}
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// Cache this in userData + get it from cache?
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final String[] mpList = getMemoryPools(userData,mmm,mmarc);
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if (mpList == null || mpList.length < 1) return;
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final String mmmName = mmm.getName();
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for (int i = 0; i < mpList.length; i++) {
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final String mpmName = mpList[i];
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if (mpmName == null) continue;
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final SnmpOid mpIndex = poolIndexMap.get(mpmName);
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if (mpIndex == null) continue;
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// The MemoryPool index is an int, so it's the first
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// and only subidentifier.
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final long mparc;
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try {
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mparc = mpIndex.getOidArc(0);
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} catch (SnmpStatusException x) {
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log.debug("updateTreeMap","Bad MemoryPool OID index: " +
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mpIndex);
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log.debug("updateTreeMap",x);
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continue;
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}
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// The MemoryMgrPoolRel table indexed is composed
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// of the MemoryManager index, to which the MemoryPool
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// index is appended.
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final long[] arcs = { mmarc, mparc };
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final SnmpOid index = new SnmpOid(arcs);
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table.put(index, new JvmMemMgrPoolRelEntryImpl(mmmName,
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mpmName,
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(int)mmarc,
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(int)mparc));
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}
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}
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protected void updateTreeMap(TreeMap<SnmpOid, Object> table, Object userData,
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SnmpTableHandler mmHandler,
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SnmpTableHandler mpHandler,
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Map<String, SnmpOid> poolIndexMap) {
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if (mmHandler instanceof SnmpCachedData) {
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updateTreeMap(table,userData,(SnmpCachedData)mmHandler,
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mpHandler,poolIndexMap);
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return;
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}
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SnmpOid mmIndex=null;
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while ((mmIndex = mmHandler.getNext(mmIndex))!=null) {
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final MemoryManagerMXBean mmm =
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(MemoryManagerMXBean)mmHandler.getData(mmIndex);
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if (mmm == null) continue;
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updateTreeMap(table,userData,mmm,mmIndex,poolIndexMap);
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}
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}
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protected void updateTreeMap(TreeMap<SnmpOid, Object> table, Object userData,
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SnmpCachedData mmHandler,
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SnmpTableHandler mpHandler,
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Map<String, SnmpOid> poolIndexMap) {
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final SnmpOid[] indexes = mmHandler.indexes;
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final Object[] datas = mmHandler.datas;
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final int size = indexes.length;
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for (int i=size-1; i>-1; i--) {
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final MemoryManagerMXBean mmm =
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(MemoryManagerMXBean)datas[i];
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if (mmm == null) continue;
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updateTreeMap(table,userData,mmm,indexes[i],poolIndexMap);
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}
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}
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}
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// The weak cache for this table.
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protected SnmpTableCache cache;
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private transient JvmMemManagerTableMetaImpl managers = null;
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private transient JvmMemPoolTableMetaImpl pools = null;
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/**
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* Constructor for the table. Initialize metadata for
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* "JvmMemMgrPoolRelTableMeta".
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* The reference on the MBean server is updated so the entries
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* created through an SNMP SET will be AUTOMATICALLY REGISTERED
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* in Java DMK.
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*/
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public JvmMemMgrPoolRelTableMetaImpl(SnmpMib myMib,
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SnmpStandardObjectServer objserv) {
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super(myMib,objserv);
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this.cache = new
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JvmMemMgrPoolRelTableCache(this,((JVM_MANAGEMENT_MIB_IMPL)myMib).
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validity());
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}
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// Returns a pointer to the JvmMemManager meta node - we're going
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// to reuse its SnmpTableHandler in order to implement the
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// relation table.
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private final JvmMemManagerTableMetaImpl getManagers(SnmpMib mib) {
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if (managers == null) {
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managers = (JvmMemManagerTableMetaImpl)
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mib.getRegisteredTableMeta("JvmMemManagerTable");
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}
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return managers;
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}
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// Returns a pointer to the JvmMemPool meta node - we're going
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// to reuse its SnmpTableHandler in order to implement the
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// relation table.
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private final JvmMemPoolTableMetaImpl getPools(SnmpMib mib) {
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if (pools == null) {
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pools = (JvmMemPoolTableMetaImpl)
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mib.getRegisteredTableMeta("JvmMemPoolTable");
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}
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return pools;
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}
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/**
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* Returns the JvmMemManagerTable SnmpTableHandler
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**/
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protected SnmpTableHandler getManagerHandler(Object userData) {
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final JvmMemManagerTableMetaImpl managerTable = getManagers(theMib);
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return managerTable.getHandler(userData);
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}
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/**
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* Returns the JvmMemPoolTable SnmpTableHandler
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**/
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protected SnmpTableHandler getPoolHandler(Object userData) {
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final JvmMemPoolTableMetaImpl poolTable = getPools(theMib);
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return poolTable.getHandler(userData);
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}
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// See com.sun.jmx.snmp.agent.SnmpMibTable
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protected SnmpOid getNextOid(Object userData)
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throws SnmpStatusException {
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// null means get the first OID.
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return getNextOid(null,userData);
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}
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// See com.sun.jmx.snmp.agent.SnmpMibTable
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protected SnmpOid getNextOid(SnmpOid oid, Object userData)
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throws SnmpStatusException {
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final boolean dbg = log.isDebugOn();
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if (dbg) log.debug("getNextOid", "previous=" + oid);
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// Get the data handler.
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//
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SnmpTableHandler handler = getHandler(userData);
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if (handler == null) {
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// This should never happen.
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// If we get here it's a bug.
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//
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if (dbg) log.debug("getNextOid", "handler is null!");
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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}
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// Get the next oid
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//
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final SnmpOid next = handler.getNext(oid);
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if (dbg) log.debug("getNextOid", "next=" + next);
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// if next is null: we reached the end of the table.
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//
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if (next == null)
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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return next;
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}
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// See com.sun.jmx.snmp.agent.SnmpMibTable
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protected boolean contains(SnmpOid oid, Object userData) {
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// Get the handler.
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//
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SnmpTableHandler handler = getHandler(userData);
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// handler should never be null.
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//
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if (handler == null)
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return false;
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return handler.contains(oid);
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}
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// See com.sun.jmx.snmp.agent.SnmpMibTable
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public Object getEntry(SnmpOid oid)
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throws SnmpStatusException {
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if (oid == null || oid.getLength() < 2)
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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// Get the request contextual cache (userData).
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//
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final Map<Object, Object> m = JvmContextFactory.getUserData();
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// We know in the case of this table that the index is composed
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// of two integers,
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// o The MemoryManager is the first OID arc of the index OID.
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// o The MemoryPool is the second OID arc of the index OID.
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//
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final long mgrIndex = oid.getOidArc(0);
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final long poolIndex = oid.getOidArc(1);
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// We're going to use this name to store/retrieve the entry in
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// the request contextual cache.
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//
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// Revisit: Probably better programming to put all these strings
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// in some interface.
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//
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final String entryTag = ((m==null)?null:
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("JvmMemMgrPoolRelTable.entry." +
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mgrIndex + "." + poolIndex));
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// If the entry is in the cache, simply return it.
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//
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if (m != null) {
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final Object entry = m.get(entryTag);
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if (entry != null) return entry;
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}
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// The entry was not in the cache, make a new one.
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//
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// Get the data hanler.
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//
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SnmpTableHandler handler = getHandler(m);
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// handler should never be null.
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//
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if (handler == null)
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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// Get the data associated with our entry.
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//
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final Object data = handler.getData(oid);
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// data may be null if the OID we were given is not valid.
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//
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if (!(data instanceof JvmMemMgrPoolRelEntryImpl))
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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// make the new entry (transient object that will be kept only
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// for the duration of the request.
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//
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final Object entry = (JvmMemMgrPoolRelEntryImpl)data;
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// XXXXX Revisit
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// new JvmMemMgrPoolRelEntryImpl((MemoryManagerMXBean)data,
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// (int)mgrIndex,(int)poolIndex);
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// Put the entry in the cache in case we need it later while processing
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// the request.
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//
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if (m != null && entry != null) {
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m.put(entryTag,entry);
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}
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return entry;
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}
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/**
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* Get the SnmpTableHandler that holds the jvmMemManagerTable data.
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* First look it up in the request contextual cache, and if it is
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* not found, obtain it from the weak cache.
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* <br>The request contextual cache will be released at the end of the
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* current requests, and is used only to process this request.
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* <br>The weak cache is shared by all requests, and is only
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* recomputed when it is found to be obsolete.
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* <br>Note that the data put in the request contextual cache is
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* never considered to be obsolete, in order to preserve data
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* coherency.
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**/
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protected SnmpTableHandler getHandler(Object userData) {
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final Map<Object, Object> m;
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if (userData instanceof Map) m=Util.cast(userData);
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else m=null;
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// Look in the contextual cache.
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if (m != null) {
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final SnmpTableHandler handler =
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(SnmpTableHandler)m.get("JvmMemMgrPoolRelTable.handler");
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if (handler != null) return handler;
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}
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// No handler in contextual cache, make a new one.
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final SnmpTableHandler handler = cache.getTableHandler();
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|
|
|
if (m != null && handler != null )
|
|
m.put("JvmMemMgrPoolRelTable.handler",handler);
|
|
|
|
return handler;
|
|
}
|
|
|
|
static final MibLogger log =
|
|
new MibLogger(JvmMemMgrPoolRelTableMetaImpl.class);
|
|
}
|