/*
* Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package sun.management.snmp.jvminstr;
// java imports
//
import com.sun.jmx.mbeanserver.Util;
import java.util.List;
import java.util.Map;
// jmx imports
//
import javax.management.MBeanServer;
import javax.management.ObjectName;
import com.sun.jmx.snmp.SnmpCounter;
import com.sun.jmx.snmp.SnmpCounter64;
import com.sun.jmx.snmp.SnmpGauge;
import com.sun.jmx.snmp.SnmpInt;
import com.sun.jmx.snmp.SnmpUnsignedInt;
import com.sun.jmx.snmp.SnmpIpAddress;
import com.sun.jmx.snmp.SnmpTimeticks;
import com.sun.jmx.snmp.SnmpOpaque;
import com.sun.jmx.snmp.SnmpString;
import com.sun.jmx.snmp.SnmpStringFixed;
import com.sun.jmx.snmp.SnmpOid;
import com.sun.jmx.snmp.SnmpNull;
import com.sun.jmx.snmp.SnmpValue;
import com.sun.jmx.snmp.SnmpVarBind;
import com.sun.jmx.snmp.SnmpStatusException;
// jdmk imports
//
import com.sun.jmx.snmp.agent.SnmpIndex;
import com.sun.jmx.snmp.agent.SnmpMib;
import com.sun.jmx.snmp.agent.SnmpMibTable;
import com.sun.jmx.snmp.agent.SnmpMibSubRequest;
import com.sun.jmx.snmp.agent.SnmpStandardObjectServer;
import sun.management.snmp.jvmmib.JvmRTLibraryPathTableMeta;
import sun.management.snmp.util.SnmpCachedData;
import sun.management.snmp.util.SnmpTableCache;
import sun.management.snmp.util.SnmpTableHandler;
import sun.management.snmp.util.MibLogger;
import sun.management.snmp.util.JvmContextFactory;
/**
* The class is used for implementing the "JvmRTLibraryPathTable".
*/
public class JvmRTLibraryPathTableMetaImpl extends JvmRTLibraryPathTableMeta {
static final long serialVersionUID = 6713252710712502068L;
private SnmpTableCache cache;
/**
* A concrete implementation of {@link SnmpTableCache}, for the
* JvmRTLibraryPathTable.
**/
private static class JvmRTLibraryPathTableCache extends SnmpTableCache {
static final long serialVersionUID = 2035304445719393195L;
private JvmRTLibraryPathTableMetaImpl meta;
JvmRTLibraryPathTableCache(JvmRTLibraryPathTableMetaImpl meta,
long validity) {
this.meta = meta;
this.validity = validity;
}
/**
* Call <code>getTableDatas(JvmContextFactory.getUserData())</code>.
**/
public SnmpTableHandler getTableHandler() {
final Map<Object,Object> userData = JvmContextFactory.getUserData();
return getTableDatas(userData);
}
/**
* Return a table handler containing the Thread indexes.
* Indexes are computed from the ThreadId.
**/
protected SnmpCachedData updateCachedDatas(Object userData) {
// We are getting all the input args
final String[] path =
JvmRuntimeImpl.getLibraryPath(userData);
// Time stamp for the cache
final long time = System.currentTimeMillis();
final int len = path.length;
SnmpOid indexes[] = new SnmpOid[len];
for(int i = 0; i < len; i++) {
indexes[i] = new SnmpOid(i + 1);
}
return new SnmpCachedData(time, indexes, path);
}
}
/**
* Constructor for the table. Initialize metadata for
* "JvmRTLibraryPathTableMeta".
* The reference on the MBean server is updated so the entries
* created through an SNMP SET will be AUTOMATICALLY REGISTERED
* in Java DMK.
*/
public JvmRTLibraryPathTableMetaImpl(SnmpMib myMib,
SnmpStandardObjectServer objserv) {
super(myMib, objserv);
cache = new JvmRTLibraryPathTableCache(this, -1);
}
// See com.sun.jmx.snmp.agent.SnmpMibTable
protected SnmpOid getNextOid(Object userData)
throws SnmpStatusException {
// null means get the first OID.
return getNextOid(null,userData);
}
// See com.sun.jmx.snmp.agent.SnmpMibTable
protected SnmpOid getNextOid(SnmpOid oid, Object userData)
throws SnmpStatusException {
final boolean dbg = log.isDebugOn();
if (dbg) log.debug("getNextOid", "previous=" + oid);
// Get the data handler.
//
SnmpTableHandler handler = getHandler(userData);
if (handler == null) {
// This should never happen.
// If we get here it's a bug.
//
if (dbg) log.debug("getNextOid", "handler is null!");
throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
}
// Get the next oid
//
final SnmpOid next = handler.getNext(oid);
if (dbg) log.debug("*** **** **** **** getNextOid", "next=" + next);
// if next is null: we reached the end of the table.
//
if (next == null)
throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
return next;
}
// See com.sun.jmx.snmp.agent.SnmpMibTable
protected boolean contains(SnmpOid oid, Object userData) {
// Get the handler.
//
SnmpTableHandler handler = getHandler(userData);
// handler should never be null.
//
if (handler == null)
return false;
return handler.contains(oid);
}
// See com.sun.jmx.snmp.agent.SnmpMibTable
public Object getEntry(SnmpOid oid)
throws SnmpStatusException {
final boolean dbg = log.isDebugOn();
if (dbg) log.debug("getEntry", "oid [" + oid + "]");
if (oid == null || oid.getLength() != 1) {
if (dbg) log.debug("getEntry", "Invalid oid [" + oid + "]");
throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
}
// Get the request contextual cache (userData).
//
final Map<Object, Object> m = JvmContextFactory.getUserData();
// We're going to use this name to store/retrieve the entry in
// the request contextual cache.
//
// Revisit: Probably better programming to put all these strings
// in some interface.
//
final String entryTag = ((m==null)?null:
("JvmRTLibraryPathTable.entry." +
oid.toString()));
// If the entry is in the cache, simply return it.
//
if (m != null) {
final Object entry = m.get(entryTag);
if (entry != null) {
if (dbg)
log.debug("getEntry", "Entry is already in the cache");
return entry;
} else if (dbg) log.debug("getEntry", "Entry is not in the cache");
}
// The entry was not in the cache, make a new one.
//
// Get the data hanler.
//
SnmpTableHandler handler = getHandler(m);
// handler should never be null.
//
if (handler == null)
throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
// Get the data associated with our entry.
//
final Object data = handler.getData(oid);
// data may be null if the OID we were given is not valid.
//
if (data == null)
throw new SnmpStatusException(SnmpStatusException.noSuchInstance);
// make the new entry (transient object that will be kept only
// for the duration of the request.
//
if (dbg) log.debug("getEntry","data is a: "+
data.getClass().getName());
final Object entry =
new JvmRTLibraryPathEntryImpl((String) data,(int)oid.getOidArc(0));
// Put the entry in the cache in case we need it later while processing
// the request.
//
if (m != null && entry != null) {
m.put(entryTag,entry);
}
return entry;
}
/**
* Get the SnmpTableHandler that holds the jvmThreadInstanceTable data.
* First look it up in the request contextual cache, and if it is
* not found, obtain it from the weak cache.
* <br>The request contextual cache will be released at the end of the
* current requests, and is used only to process this request.
* <br>The weak cache is shared by all requests, and is only
* recomputed when it is found to be obsolete.
* <br>Note that the data put in the request contextual cache is
* never considered to be obsolete, in order to preserve data
* coherency.
**/
protected SnmpTableHandler getHandler(Object userData) {
final Map<Object, Object> m;
if (userData instanceof Map) m=Util.cast(userData);
else m=null;
// Look in the contextual cache.
if (m != null) {
final SnmpTableHandler handler =
(SnmpTableHandler)m.get("JvmRTLibraryPathTable.handler");
if (handler != null) return handler;
}
// No handler in contextual cache, make a new one.
final SnmpTableHandler handler = cache.getTableHandler();
if (m != null && handler != null )
m.put("JvmRTLibraryPathTable.handler",handler);
return handler;
}
static final MibLogger log =
new MibLogger(JvmRTLibraryPathTableMetaImpl.class);
}