302 lines
10 KiB
Java
302 lines
10 KiB
Java
/*
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* Copyright (c) 2004, 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.util.List;
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import java.util.Map;
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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.SnmpCounter;
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import com.sun.jmx.snmp.SnmpCounter64;
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import com.sun.jmx.snmp.SnmpGauge;
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import com.sun.jmx.snmp.SnmpInt;
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import com.sun.jmx.snmp.SnmpUnsignedInt;
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import com.sun.jmx.snmp.SnmpIpAddress;
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import com.sun.jmx.snmp.SnmpTimeticks;
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import com.sun.jmx.snmp.SnmpOpaque;
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import com.sun.jmx.snmp.SnmpString;
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import com.sun.jmx.snmp.SnmpStringFixed;
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import com.sun.jmx.snmp.SnmpOid;
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import com.sun.jmx.snmp.SnmpNull;
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import com.sun.jmx.snmp.SnmpValue;
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import com.sun.jmx.snmp.SnmpVarBind;
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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.SnmpIndex;
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import com.sun.jmx.snmp.agent.SnmpMib;
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import com.sun.jmx.snmp.agent.SnmpMibTable;
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import com.sun.jmx.snmp.agent.SnmpMibSubRequest;
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import com.sun.jmx.snmp.agent.SnmpStandardObjectServer;
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import sun.management.snmp.jvmmib.JvmRTClassPathTableMeta;
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import sun.management.snmp.util.SnmpCachedData;
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import sun.management.snmp.util.SnmpTableCache;
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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 "JvmRTClassPathTable".
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*/
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public class JvmRTClassPathTableMetaImpl extends JvmRTClassPathTableMeta {
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static final long serialVersionUID = -6914494148818455166L;
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private SnmpTableCache cache;
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/**
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* A concrete implementation of {@link SnmpTableCache}, for the
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* JvmRTClassPathTable.
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**/
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private static class JvmRTClassPathTableCache extends SnmpTableCache {
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static final long serialVersionUID = 3805032372592117315L;
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private JvmRTClassPathTableMetaImpl meta;
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JvmRTClassPathTableCache(JvmRTClassPathTableMetaImpl meta,
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long validity) {
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this.meta = meta;
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this.validity = validity;
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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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* Return a table handler containing the Thread indexes.
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* Indexes are computed from the ThreadId.
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**/
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protected SnmpCachedData updateCachedDatas(Object userData) {
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// We are getting all the input args
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final String[] path =
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JvmRuntimeImpl.getClassPath(userData);
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// Time stamp for the cache
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final long time = System.currentTimeMillis();
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final int len = path.length;
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SnmpOid indexes[] = new SnmpOid[len];
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for(int i = 0; i < len; i++) {
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indexes[i] = new SnmpOid(i + 1);
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}
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return new SnmpCachedData(time, indexes, path);
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}
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}
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/**
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* Constructor for the table. Initialize metadata for
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* "JvmRTClassPathTableMeta".
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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 JvmRTClassPathTableMetaImpl(SnmpMib myMib,
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SnmpStandardObjectServer objserv) {
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super(myMib, objserv);
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cache = new JvmRTClassPathTableCache(this, -1);
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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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final boolean dbg = log.isDebugOn();
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if (dbg) log.debug("getEntry", "oid [" + oid + "]");
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if (oid == null || oid.getLength() != 1) {
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if (dbg) log.debug("getEntry", "Invalid oid [" + oid + "]");
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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}
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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'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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("JvmRTClassPathTable.entry." +
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oid.toString()));
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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) {
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if (dbg)
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log.debug("getEntry", "Entry is already in the cache");
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return entry;
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} else
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if (dbg) log.debug("getEntry", "Entry is not in the cache");
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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 == null)
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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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if (dbg)
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log.debug("getEntry","data is a: " + data.getClass().getName());
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final Object entry =
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new JvmRTClassPathEntryImpl((String) data, (int) oid.getOidArc(0));
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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 jvmThreadInstanceTable 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("JvmRTClassPathTable.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 )
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m.put("JvmRTClassPathTable.handler",handler);
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return handler;
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}
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static final MibLogger log =
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new MibLogger(JvmRTClassPathTableMetaImpl.class);
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}
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