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| 1 | +/* | |
| 2 | + * Copyright (c) 2004, 2006, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package sun.management.snmp.jvminstr; | |
| 26 | + | |
| 27 | +// java imports | |
| 28 | +// | |
| 29 | +import com.sun.jmx.mbeanserver.Util; | |
| 30 | +import java.util.List; | |
| 31 | +import java.util.Map; | |
| 32 | + | |
| 33 | +// jmx imports | |
| 34 | +// | |
| 35 | +import javax.management.MBeanServer; | |
| 36 | +import javax.management.ObjectName; | |
| 37 | +import com.sun.jmx.snmp.SnmpCounter; | |
| 38 | +import com.sun.jmx.snmp.SnmpCounter64; | |
| 39 | +import com.sun.jmx.snmp.SnmpGauge; | |
| 40 | +import com.sun.jmx.snmp.SnmpInt; | |
| 41 | +import com.sun.jmx.snmp.SnmpUnsignedInt; | |
| 42 | +import com.sun.jmx.snmp.SnmpIpAddress; | |
| 43 | +import com.sun.jmx.snmp.SnmpTimeticks; | |
| 44 | +import com.sun.jmx.snmp.SnmpOpaque; | |
| 45 | +import com.sun.jmx.snmp.SnmpString; | |
| 46 | +import com.sun.jmx.snmp.SnmpStringFixed; | |
| 47 | +import com.sun.jmx.snmp.SnmpOid; | |
| 48 | +import com.sun.jmx.snmp.SnmpNull; | |
| 49 | +import com.sun.jmx.snmp.SnmpValue; | |
| 50 | +import com.sun.jmx.snmp.SnmpVarBind; | |
| 51 | +import com.sun.jmx.snmp.SnmpStatusException; | |
| 52 | + | |
| 53 | +// jdmk imports | |
| 54 | +// | |
| 55 | +import com.sun.jmx.snmp.agent.SnmpIndex; | |
| 56 | +import com.sun.jmx.snmp.agent.SnmpMib; | |
| 57 | +import com.sun.jmx.snmp.agent.SnmpMibTable; | |
| 58 | +import com.sun.jmx.snmp.agent.SnmpMibSubRequest; | |
| 59 | +import com.sun.jmx.snmp.agent.SnmpStandardObjectServer; | |
| 60 | + | |
| 61 | +import sun.management.snmp.jvmmib.JvmRTLibraryPathTableMeta; | |
| 62 | +import sun.management.snmp.util.SnmpCachedData; | |
| 63 | +import sun.management.snmp.util.SnmpTableCache; | |
| 64 | +import sun.management.snmp.util.SnmpTableHandler; | |
| 65 | +import sun.management.snmp.util.MibLogger; | |
| 66 | +import sun.management.snmp.util.JvmContextFactory; | |
| 67 | + | |
| 68 | +/** | |
| 69 | + * The class is used for implementing the "JvmRTLibraryPathTable". | |
| 70 | + */ | |
| 71 | +public class JvmRTLibraryPathTableMetaImpl extends JvmRTLibraryPathTableMeta { | |
| 72 | + | |
| 73 | + private SnmpTableCache cache; | |
| 74 | + | |
| 75 | + /** | |
| 76 | + * A concrete implementation of {@link SnmpTableCache}, for the | |
| 77 | + * JvmRTLibraryPathTable. | |
| 78 | + **/ | |
| 79 | + private static class JvmRTLibraryPathTableCache extends SnmpTableCache { | |
| 80 | + private JvmRTLibraryPathTableMetaImpl meta; | |
| 81 | + | |
| 82 | + JvmRTLibraryPathTableCache(JvmRTLibraryPathTableMetaImpl meta, | |
| 83 | + long validity) { | |
| 84 | + this.meta = meta; | |
| 85 | + this.validity = validity; | |
| 86 | + } | |
| 87 | + | |
| 88 | + /** | |
| 89 | + * Call <code>getTableDatas(JvmContextFactory.getUserData())</code>. | |
| 90 | + **/ | |
| 91 | + public SnmpTableHandler getTableHandler() { | |
| 92 | + final Map userData = JvmContextFactory.getUserData(); | |
| 93 | + return getTableDatas(userData); | |
| 94 | + } | |
| 95 | + | |
| 96 | + | |
| 97 | + /** | |
| 98 | + * Return a table handler containing the Thread indexes. | |
| 99 | + * Indexes are computed from the ThreadId. | |
| 100 | + **/ | |
| 101 | + protected SnmpCachedData updateCachedDatas(Object userData) { | |
| 102 | + | |
| 103 | + | |
| 104 | + // We are getting all the input args | |
| 105 | + final String[] path = | |
| 106 | + JvmRuntimeImpl.getLibraryPath(userData); | |
| 107 | + | |
| 108 | + // Time stamp for the cache | |
| 109 | + final long time = System.currentTimeMillis(); | |
| 110 | + final int len = path.length; | |
| 111 | + | |
| 112 | + SnmpOid indexes[] = new SnmpOid[len]; | |
| 113 | + | |
| 114 | + for(int i = 0; i < len; i++) { | |
| 115 | + indexes[i] = new SnmpOid(i + 1); | |
| 116 | + } | |
| 117 | + | |
| 118 | + return new SnmpCachedData(time, indexes, path); | |
| 119 | + } | |
| 120 | + } | |
| 121 | + | |
| 122 | + /** | |
| 123 | + * Constructor for the table. Initialize metadata for | |
| 124 | + * "JvmRTLibraryPathTableMeta". | |
| 125 | + * The reference on the MBean server is updated so the entries | |
| 126 | + * created through an SNMP SET will be AUTOMATICALLY REGISTERED | |
| 127 | + * in Java DMK. | |
| 128 | + */ | |
| 129 | + public JvmRTLibraryPathTableMetaImpl(SnmpMib myMib, | |
| 130 | + SnmpStandardObjectServer objserv) { | |
| 131 | + super(myMib, objserv); | |
| 132 | + cache = new JvmRTLibraryPathTableCache(this, -1); | |
| 133 | + } | |
| 134 | + | |
| 135 | + // See com.sun.jmx.snmp.agent.SnmpMibTable | |
| 136 | + protected SnmpOid getNextOid(Object userData) | |
| 137 | + throws SnmpStatusException { | |
| 138 | + // null means get the first OID. | |
| 139 | + return getNextOid(null,userData); | |
| 140 | + } | |
| 141 | + | |
| 142 | + // See com.sun.jmx.snmp.agent.SnmpMibTable | |
| 143 | + protected SnmpOid getNextOid(SnmpOid oid, Object userData) | |
| 144 | + throws SnmpStatusException { | |
| 145 | + final boolean dbg = log.isDebugOn(); | |
| 146 | + if (dbg) log.debug("getNextOid", "previous=" + oid); | |
| 147 | + | |
| 148 | + | |
| 149 | + // Get the data handler. | |
| 150 | + // | |
| 151 | + SnmpTableHandler handler = getHandler(userData); | |
| 152 | + if (handler == null) { | |
| 153 | + // This should never happen. | |
| 154 | + // If we get here it's a bug. | |
| 155 | + // | |
| 156 | + if (dbg) log.debug("getNextOid", "handler is null!"); | |
| 157 | + throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | |
| 158 | + } | |
| 159 | + | |
| 160 | + // Get the next oid | |
| 161 | + // | |
| 162 | + final SnmpOid next = handler.getNext(oid); | |
| 163 | + if (dbg) log.debug("*** **** **** **** getNextOid", "next=" + next); | |
| 164 | + | |
| 165 | + // if next is null: we reached the end of the table. | |
| 166 | + // | |
| 167 | + if (next == null) | |
| 168 | + throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | |
| 169 | + | |
| 170 | + return next; | |
| 171 | + } | |
| 172 | + | |
| 173 | + | |
| 174 | + // See com.sun.jmx.snmp.agent.SnmpMibTable | |
| 175 | + protected boolean contains(SnmpOid oid, Object userData) { | |
| 176 | + | |
| 177 | + // Get the handler. | |
| 178 | + // | |
| 179 | + SnmpTableHandler handler = getHandler(userData); | |
| 180 | + | |
| 181 | + // handler should never be null. | |
| 182 | + // | |
| 183 | + if (handler == null) | |
| 184 | + return false; | |
| 185 | + | |
| 186 | + return handler.contains(oid); | |
| 187 | + } | |
| 188 | + | |
| 189 | + // See com.sun.jmx.snmp.agent.SnmpMibTable | |
| 190 | + public Object getEntry(SnmpOid oid) | |
| 191 | + throws SnmpStatusException { | |
| 192 | + final boolean dbg = log.isDebugOn(); | |
| 193 | + if (dbg) log.debug("getEntry", "oid [" + oid + "]"); | |
| 194 | + if (oid == null || oid.getLength() != 1) { | |
| 195 | + if (dbg) log.debug("getEntry", "Invalid oid [" + oid + "]"); | |
| 196 | + throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | |
| 197 | + } | |
| 198 | + | |
| 199 | + // Get the request contextual cache (userData). | |
| 200 | + // | |
| 201 | + final Map<Object, Object> m = JvmContextFactory.getUserData(); | |
| 202 | + | |
| 203 | + // We're going to use this name to store/retrieve the entry in | |
| 204 | + // the request contextual cache. | |
| 205 | + // | |
| 206 | + // Revisit: Probably better programming to put all these strings | |
| 207 | + // in some interface. | |
| 208 | + // | |
| 209 | + final String entryTag = ((m==null)?null: | |
| 210 | + ("JvmRTLibraryPathTable.entry." + | |
| 211 | + oid.toString())); | |
| 212 | + | |
| 213 | + // If the entry is in the cache, simply return it. | |
| 214 | + // | |
| 215 | + if (m != null) { | |
| 216 | + final Object entry = m.get(entryTag); | |
| 217 | + if (entry != null) { | |
| 218 | + if (dbg) | |
| 219 | + log.debug("getEntry", "Entry is already in the cache"); | |
| 220 | + return entry; | |
| 221 | + } else if (dbg) log.debug("getEntry", "Entry is not in the cache"); | |
| 222 | + | |
| 223 | + } | |
| 224 | + | |
| 225 | + // The entry was not in the cache, make a new one. | |
| 226 | + // | |
| 227 | + // Get the data hanler. | |
| 228 | + // | |
| 229 | + SnmpTableHandler handler = getHandler(m); | |
| 230 | + | |
| 231 | + // handler should never be null. | |
| 232 | + // | |
| 233 | + if (handler == null) | |
| 234 | + throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | |
| 235 | + | |
| 236 | + // Get the data associated with our entry. | |
| 237 | + // | |
| 238 | + final Object data = handler.getData(oid); | |
| 239 | + | |
| 240 | + // data may be null if the OID we were given is not valid. | |
| 241 | + // | |
| 242 | + if (data == null) | |
| 243 | + throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | |
| 244 | + | |
| 245 | + // make the new entry (transient object that will be kept only | |
| 246 | + // for the duration of the request. | |
| 247 | + // | |
| 248 | + if (dbg) log.debug("getEntry","data is a: "+ | |
| 249 | + data.getClass().getName()); | |
| 250 | + final Object entry = | |
| 251 | + new JvmRTLibraryPathEntryImpl((String) data,(int)oid.getOidArc(0)); | |
| 252 | + | |
| 253 | + // Put the entry in the cache in case we need it later while processing | |
| 254 | + // the request. | |
| 255 | + // | |
| 256 | + if (m != null && entry != null) { | |
| 257 | + m.put(entryTag,entry); | |
| 258 | + } | |
| 259 | + | |
| 260 | + return entry; | |
| 261 | + } | |
| 262 | + | |
| 263 | + /** | |
| 264 | + * Get the SnmpTableHandler that holds the jvmThreadInstanceTable data. | |
| 265 | + * First look it up in the request contextual cache, and if it is | |
| 266 | + * not found, obtain it from the weak cache. | |
| 267 | + * <br>The request contextual cache will be released at the end of the | |
| 268 | + * current requests, and is used only to process this request. | |
| 269 | + * <br>The weak cache is shared by all requests, and is only | |
| 270 | + * recomputed when it is found to be obsolete. | |
| 271 | + * <br>Note that the data put in the request contextual cache is | |
| 272 | + * never considered to be obsolete, in order to preserve data | |
| 273 | + * coherency. | |
| 274 | + **/ | |
| 275 | + protected SnmpTableHandler getHandler(Object userData) { | |
| 276 | + final Map<Object, Object> m; | |
| 277 | + if (userData instanceof Map) m=Util.cast(userData); | |
| 278 | + else m=null; | |
| 279 | + | |
| 280 | + // Look in the contextual cache. | |
| 281 | + if (m != null) { | |
| 282 | + final SnmpTableHandler handler = | |
| 283 | + (SnmpTableHandler)m.get("JvmRTLibraryPathTable.handler"); | |
| 284 | + if (handler != null) return handler; | |
| 285 | + } | |
| 286 | + | |
| 287 | + // No handler in contextual cache, make a new one. | |
| 288 | + final SnmpTableHandler handler = cache.getTableHandler(); | |
| 289 | + | |
| 290 | + if (m != null && handler != null ) | |
| 291 | + m.put("JvmRTLibraryPathTable.handler",handler); | |
| 292 | + | |
| 293 | + return handler; | |
| 294 | + } | |
| 295 | + | |
| 296 | + static final MibLogger log = | |
| 297 | + new MibLogger(JvmRTLibraryPathTableMetaImpl.class); | |
| 298 | +} | |