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/*
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* Copyright 2003-2006 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any 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.Vector;
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import java.util.Map;
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import java.util.TreeMap;
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import java.util.Enumeration;
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import java.lang.management.ThreadInfo;
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import java.lang.management.ManagementFactory;
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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.JvmThreadInstanceEntryMBean;
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import sun.management.snmp.jvmmib.JvmThreadInstanceTableMeta;
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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 "JvmThreadInstanceTable" group.
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*/
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public class JvmThreadInstanceTableMetaImpl
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extends JvmThreadInstanceTableMeta {
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/**
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* Maximum depth of the stacktrace that might be returned through
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* SNMP.
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*
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* Since we do not export the stack trace through SNMP, we set
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* MAX_STACK_TRACE_DEPTH=0 so that ThreadMXBean.getThreadInfo(long) does
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* not compute the stack trace.
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*
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**/
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public static final int MAX_STACK_TRACE_DEPTH=0;
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/**
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* Translate from a long to a Oid. Arc follow the long big-endian order.
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* @param l The long to make the index from
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* @return The arc array.
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*/
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static SnmpOid makeOid(long l) {
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long[] x = new long [8];
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x[0] = (l >> 56) & 0xFF;
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x[1] = (l >> 48) & 0x00FF;
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x[2] = (l >> 40) & 0x0000FF;
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x[3] = (l >> 32) & 0x000000FF;
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x[4] = (l >> 24) & 0x00000000FF;
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x[5] = (l >> 16) & 0x0000000000FF;
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x[6] = (l >> 8) & 0x000000000000FF;
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x[7] = l & 0x00000000000000FF;
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return new SnmpOid(x);
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}
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/**
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* Translate an Oid to a thread id. Arc follow the long big-endian order.
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* @param oid The oid to make the id from
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* @return The thread id.
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*/
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static long makeId(SnmpOid oid) {
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long id = 0;
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long[] arcs = oid.longValue(false);
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id |= arcs[0] << 56;
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id |= arcs[1] << 48;
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id |= arcs[2] << 40;
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id |= arcs[3] << 32;
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id |= arcs[4] << 24;
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id |= arcs[5] << 16;
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id |= arcs[6] << 8;
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id |= arcs[7];
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return id;
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}
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/**
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* A concrete implementation of {@link SnmpTableCache}, for the
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* JvmThreadInstanceTable.
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**/
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private static class JvmThreadInstanceTableCache
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extends SnmpTableCache {
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final private JvmThreadInstanceTableMetaImpl meta;
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/**
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* Create a weak cache for the JvmThreadInstanceTable.
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* @param validity validity of the cached data, in ms.
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**/
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JvmThreadInstanceTableCache(JvmThreadInstanceTableMetaImpl 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 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 thread ids. WARNING.
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// Some of them will be not valid when accessed for data...
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// See getEntry
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long[] id = JvmThreadingImpl.getThreadMXBean().getAllThreadIds();
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// Time stamp for the cache
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final long time = System.currentTimeMillis();
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SnmpOid indexes[] = new SnmpOid[id.length];
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final TreeMap<SnmpOid, Object> table =
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new TreeMap<SnmpOid, Object>(SnmpCachedData.oidComparator);
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for(int i = 0; i < id.length; i++) {
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log.debug("", "Making index for thread id [" + id[i] +"]");
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//indexes[i] = makeOid(id[i]);
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SnmpOid oid = makeOid(id[i]);
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table.put(oid, oid);
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}
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return new SnmpCachedData(time, table);
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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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/**
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* Constructor for the table. Initialize metadata for
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* "JvmThreadInstanceTableMeta".
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* The reference on the MBean server is updated so the entries created
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* through an SNMP SET will be AUTOMATICALLY REGISTERED in Java DMK.
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*/
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public JvmThreadInstanceTableMetaImpl(SnmpMib myMib,
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SnmpStandardObjectServer objserv) {
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super(myMib, objserv);
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cache = new JvmThreadInstanceTableCache(this,
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((JVM_MANAGEMENT_MIB_IMPL)myMib).validity());
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log.debug("JvmThreadInstanceTableMetaImpl", "Create Thread meta");
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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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log.debug("JvmThreadInstanceTableMetaImpl", "getNextOid");
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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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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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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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SnmpOid next = oid;
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while(true) {
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next = handler.getNext(next);
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if (next == null) break;
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if (getJvmThreadInstance(userData,next) != null) break;
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}
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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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if(!handler.contains(oid))
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return false;
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JvmThreadInstanceEntryImpl inst = getJvmThreadInstance(userData, oid);
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return (inst != null);
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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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log.debug("*** **** **** **** getEntry", "oid [" + oid + "]");
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if (oid == null || oid.getLength() != 8) {
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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 m = JvmContextFactory.getUserData();
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// Get the handler.
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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 || !handler.contains(oid))
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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final JvmThreadInstanceEntryImpl entry = getJvmThreadInstance(m,oid);
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if (entry == null)
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throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
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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("JvmThreadInstanceTable.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("JvmThreadInstanceTable.handler",handler);
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return handler;
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}
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private ThreadInfo getThreadInfo(long id) {
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return JvmThreadingImpl.getThreadMXBean().
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getThreadInfo(id,MAX_STACK_TRACE_DEPTH);
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}
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private ThreadInfo getThreadInfo(SnmpOid oid) {
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return getThreadInfo(makeId(oid));
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}
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private JvmThreadInstanceEntryImpl getJvmThreadInstance(Object userData,
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SnmpOid oid) {
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JvmThreadInstanceEntryImpl cached = null;
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String entryTag = null;
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Map<Object, Object> map = null;
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final boolean dbg = log.isDebugOn();
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if (userData instanceof Map) {
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map = Util.cast(userData);
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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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entryTag = "JvmThreadInstanceTable.entry." + oid.toString();
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cached = (JvmThreadInstanceEntryImpl) map.get(entryTag);
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}
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// If the entry is in the cache, simply return it.
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//
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if (cached != null) {
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if (dbg) log.debug("*** getJvmThreadInstance",
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"Entry found in cache: " + entryTag);
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return cached;
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}
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if (dbg) log.debug("*** getJvmThreadInstance", "Entry [" +
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oid + "] is not in cache");
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// Entry not in cache. We will create one if needed.
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//
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ThreadInfo info = null;
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try {
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info = getThreadInfo(oid);
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} catch (RuntimeException r) {
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log.trace("*** getJvmThreadInstance",
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"Failed to get thread info for rowOid: " + oid);
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log.debug("*** getJvmThreadInstance",r);
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}
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// No thread by that id => no entry.
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//
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if(info == null) {
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if (dbg) log.debug("*** getJvmThreadInstance",
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"No entry by that oid [" + oid + "]");
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return null;
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}
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cached = new JvmThreadInstanceEntryImpl(info, oid.toByte());
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if (map != null) map.put(entryTag, cached);
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if (dbg) log.debug("*** getJvmThreadInstance",
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"Entry created for Thread OID [" + oid + "]");
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return cached;
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}
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static final MibLogger log =
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new MibLogger(JvmThreadInstanceTableMetaImpl.class);
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}
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