author | alanb |
Fri, 02 Nov 2012 15:50:11 +0000 | |
changeset 14342 | 8435a30053c1 |
parent 11530 | a9d059c15b80 |
permissions | -rw-r--r-- |
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/* |
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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) { |
2 | 269 |
if (mmHandler instanceof SnmpCachedData) { |
270 |
updateTreeMap(table,userData,(SnmpCachedData)mmHandler, |
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mpHandler,poolIndexMap); |
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return; |
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} |
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275 |
SnmpOid mmIndex=null; |
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276 |
while ((mmIndex = mmHandler.getNext(mmIndex))!=null) { |
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277 |
final MemoryManagerMXBean mmm = |
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278 |
(MemoryManagerMXBean)mmHandler.getData(mmIndex); |
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279 |
if (mmm == null) continue; |
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updateTreeMap(table,userData,mmm,mmIndex,poolIndexMap); |
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} |
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282 |
} |
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283 |
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284 |
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) { |
2 | 288 |
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289 |
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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292 |
for (int i=size-1; i>-1; i--) { |
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293 |
final MemoryManagerMXBean mmm = |
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294 |
(MemoryManagerMXBean)datas[i]; |
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295 |
if (mmm == null) continue; |
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296 |
updateTreeMap(table,userData,mmm,indexes[i],poolIndexMap); |
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297 |
} |
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298 |
} |
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299 |
} |
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300 |
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301 |
// The weak cache for this table. |
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302 |
protected SnmpTableCache cache; |
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303 |
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304 |
private transient JvmMemManagerTableMetaImpl managers = null; |
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305 |
private transient JvmMemPoolTableMetaImpl pools = null; |
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307 |
/** |
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308 |
* Constructor for the table. Initialize metadata for |
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309 |
* "JvmMemMgrPoolRelTableMeta". |
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310 |
* The reference on the MBean server is updated so the entries |
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311 |
* created through an SNMP SET will be AUTOMATICALLY REGISTERED |
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312 |
* in Java DMK. |
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313 |
*/ |
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314 |
public JvmMemMgrPoolRelTableMetaImpl(SnmpMib myMib, |
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315 |
SnmpStandardObjectServer objserv) { |
|
316 |
super(myMib,objserv); |
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317 |
this.cache = new |
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318 |
JvmMemMgrPoolRelTableCache(this,((JVM_MANAGEMENT_MIB_IMPL)myMib). |
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319 |
validity()); |
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320 |
} |
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321 |
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322 |
// Returns a pointer to the JvmMemManager meta node - we're going |
|
323 |
// to reuse its SnmpTableHandler in order to implement the |
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324 |
// relation table. |
|
325 |
private final JvmMemManagerTableMetaImpl getManagers(SnmpMib mib) { |
|
326 |
if (managers == null) { |
|
327 |
managers = (JvmMemManagerTableMetaImpl) |
|
328 |
mib.getRegisteredTableMeta("JvmMemManagerTable"); |
|
329 |
} |
|
330 |
return managers; |
|
331 |
} |
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332 |
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333 |
// Returns a pointer to the JvmMemPool meta node - we're going |
|
334 |
// to reuse its SnmpTableHandler in order to implement the |
|
335 |
// relation table. |
|
336 |
private final JvmMemPoolTableMetaImpl getPools(SnmpMib mib) { |
|
337 |
if (pools == null) { |
|
338 |
pools = (JvmMemPoolTableMetaImpl) |
|
339 |
mib.getRegisteredTableMeta("JvmMemPoolTable"); |
|
340 |
} |
|
341 |
return pools; |
|
342 |
} |
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343 |
||
344 |
/** |
|
345 |
* Returns the JvmMemManagerTable SnmpTableHandler |
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346 |
**/ |
|
347 |
protected SnmpTableHandler getManagerHandler(Object userData) { |
|
348 |
final JvmMemManagerTableMetaImpl managerTable = getManagers(theMib); |
|
349 |
return managerTable.getHandler(userData); |
|
350 |
} |
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351 |
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352 |
/** |
|
353 |
* Returns the JvmMemPoolTable SnmpTableHandler |
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354 |
**/ |
|
355 |
protected SnmpTableHandler getPoolHandler(Object userData) { |
|
356 |
final JvmMemPoolTableMetaImpl poolTable = getPools(theMib); |
|
357 |
return poolTable.getHandler(userData); |
|
358 |
} |
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359 |
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360 |
// See com.sun.jmx.snmp.agent.SnmpMibTable |
|
361 |
protected SnmpOid getNextOid(Object userData) |
|
362 |
throws SnmpStatusException { |
|
363 |
// null means get the first OID. |
|
364 |
return getNextOid(null,userData); |
|
365 |
} |
|
366 |
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367 |
// See com.sun.jmx.snmp.agent.SnmpMibTable |
|
368 |
protected SnmpOid getNextOid(SnmpOid oid, Object userData) |
|
369 |
throws SnmpStatusException { |
|
370 |
final boolean dbg = log.isDebugOn(); |
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371 |
if (dbg) log.debug("getNextOid", "previous=" + oid); |
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372 |
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373 |
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374 |
// Get the data handler. |
|
375 |
// |
|
376 |
SnmpTableHandler handler = getHandler(userData); |
|
377 |
if (handler == null) { |
|
378 |
// This should never happen. |
|
379 |
// If we get here it's a bug. |
|
380 |
// |
|
381 |
if (dbg) log.debug("getNextOid", "handler is null!"); |
|
382 |
throw new SnmpStatusException(SnmpStatusException.noSuchInstance); |
|
383 |
} |
|
384 |
||
385 |
// Get the next oid |
|
386 |
// |
|
387 |
final SnmpOid next = handler.getNext(oid); |
|
388 |
if (dbg) log.debug("getNextOid", "next=" + next); |
|
389 |
||
390 |
// if next is null: we reached the end of the table. |
|
391 |
// |
|
392 |
if (next == null) |
|
393 |
throw new SnmpStatusException(SnmpStatusException.noSuchInstance); |
|
394 |
||
395 |
return next; |
|
396 |
} |
|
397 |
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398 |
||
399 |
// See com.sun.jmx.snmp.agent.SnmpMibTable |
|
400 |
protected boolean contains(SnmpOid oid, Object userData) { |
|
401 |
||
402 |
// Get the handler. |
|
403 |
// |
|
404 |
SnmpTableHandler handler = getHandler(userData); |
|
405 |
||
406 |
// handler should never be null. |
|
407 |
// |
|
408 |
if (handler == null) |
|
409 |
return false; |
|
410 |
||
411 |
return handler.contains(oid); |
|
412 |
} |
|
413 |
||
414 |
// See com.sun.jmx.snmp.agent.SnmpMibTable |
|
415 |
public Object getEntry(SnmpOid oid) |
|
416 |
throws SnmpStatusException { |
|
417 |
||
418 |
if (oid == null || oid.getLength() < 2) |
|
419 |
throw new SnmpStatusException(SnmpStatusException.noSuchInstance); |
|
420 |
||
421 |
// Get the request contextual cache (userData). |
|
422 |
// |
|
423 |
final Map<Object, Object> m = JvmContextFactory.getUserData(); |
|
424 |
||
425 |
// We know in the case of this table that the index is composed |
|
426 |
// of two integers, |
|
427 |
// o The MemoryManager is the first OID arc of the index OID. |
|
428 |
// o The MemoryPool is the second OID arc of the index OID. |
|
429 |
// |
|
430 |
final long mgrIndex = oid.getOidArc(0); |
|
431 |
final long poolIndex = oid.getOidArc(1); |
|
432 |
||
433 |
// We're going to use this name to store/retrieve the entry in |
|
434 |
// the request contextual cache. |
|
435 |
// |
|
436 |
// Revisit: Probably better programming to put all these strings |
|
437 |
// in some interface. |
|
438 |
// |
|
439 |
final String entryTag = ((m==null)?null: |
|
440 |
("JvmMemMgrPoolRelTable.entry." + |
|
441 |
mgrIndex + "." + poolIndex)); |
|
442 |
||
443 |
// If the entry is in the cache, simply return it. |
|
444 |
// |
|
445 |
if (m != null) { |
|
446 |
final Object entry = m.get(entryTag); |
|
447 |
if (entry != null) return entry; |
|
448 |
} |
|
449 |
||
450 |
// The entry was not in the cache, make a new one. |
|
451 |
// |
|
452 |
// Get the data hanler. |
|
453 |
// |
|
454 |
SnmpTableHandler handler = getHandler(m); |
|
455 |
||
456 |
// handler should never be null. |
|
457 |
// |
|
458 |
if (handler == null) |
|
459 |
throw new SnmpStatusException(SnmpStatusException.noSuchInstance); |
|
460 |
||
461 |
// Get the data associated with our entry. |
|
462 |
// |
|
463 |
final Object data = handler.getData(oid); |
|
464 |
||
465 |
// data may be null if the OID we were given is not valid. |
|
466 |
// |
|
467 |
if (!(data instanceof JvmMemMgrPoolRelEntryImpl)) |
|
468 |
throw new SnmpStatusException(SnmpStatusException.noSuchInstance); |
|
469 |
||
470 |
// make the new entry (transient object that will be kept only |
|
471 |
// for the duration of the request. |
|
472 |
// |
|
473 |
final Object entry = (JvmMemMgrPoolRelEntryImpl)data; |
|
474 |
// XXXXX Revisit |
|
475 |
// new JvmMemMgrPoolRelEntryImpl((MemoryManagerMXBean)data, |
|
476 |
// (int)mgrIndex,(int)poolIndex); |
|
477 |
||
478 |
// Put the entry in the cache in case we need it later while processing |
|
479 |
// the request. |
|
480 |
// |
|
481 |
if (m != null && entry != null) { |
|
482 |
m.put(entryTag,entry); |
|
483 |
} |
|
484 |
||
485 |
return entry; |
|
486 |
} |
|
487 |
||
488 |
/** |
|
489 |
* Get the SnmpTableHandler that holds the jvmMemManagerTable data. |
|
490 |
* First look it up in the request contextual cache, and if it is |
|
491 |
* not found, obtain it from the weak cache. |
|
492 |
* <br>The request contextual cache will be released at the end of the |
|
493 |
* current requests, and is used only to process this request. |
|
494 |
* <br>The weak cache is shared by all requests, and is only |
|
495 |
* recomputed when it is found to be obsolete. |
|
496 |
* <br>Note that the data put in the request contextual cache is |
|
497 |
* never considered to be obsolete, in order to preserve data |
|
498 |
* coherency. |
|
499 |
**/ |
|
500 |
protected SnmpTableHandler getHandler(Object userData) { |
|
501 |
final Map<Object, Object> m; |
|
502 |
if (userData instanceof Map) m=Util.cast(userData); |
|
503 |
else m=null; |
|
504 |
||
505 |
// Look in the contextual cache. |
|
506 |
if (m != null) { |
|
507 |
final SnmpTableHandler handler = |
|
508 |
(SnmpTableHandler)m.get("JvmMemMgrPoolRelTable.handler"); |
|
509 |
if (handler != null) return handler; |
|
510 |
} |
|
511 |
||
512 |
// No handler in contextual cache, make a new one. |
|
513 |
final SnmpTableHandler handler = cache.getTableHandler(); |
|
514 |
||
515 |
if (m != null && handler != null ) |
|
516 |
m.put("JvmMemMgrPoolRelTable.handler",handler); |
|
517 |
||
518 |
return handler; |
|
519 |
} |
|
520 |
||
521 |
static final MibLogger log = |
|
522 |
new MibLogger(JvmMemMgrPoolRelTableMetaImpl.class); |
|
523 |
} |