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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.JvmRTBootClassPathTableMeta; | ||
| 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 "JvmRTBootClassPathTable". | ||
| 70 | */ | ||
| 71 | public class JvmRTBootClassPathTableMetaImpl | ||
| 72 | extends JvmRTBootClassPathTableMeta { | ||
| 73 | |||
| 74 | private SnmpTableCache cache; | ||
| 75 | |||
| 76 | /** | ||
| 77 | * A concrete implementation of {@link SnmpTableCache}, for the | ||
| 78 | * JvmRTBootClassPathTable. | ||
| 79 | **/ | ||
| 80 | private static class JvmRTBootClassPathTableCache extends SnmpTableCache { | ||
| 81 | private JvmRTBootClassPathTableMetaImpl meta; | ||
| 82 | |||
| 83 | JvmRTBootClassPathTableCache(JvmRTBootClassPathTableMetaImpl meta, | ||
| 84 | long validity) { | ||
| 85 | this.meta = meta; | ||
| 86 | this.validity = validity; | ||
| 87 | } | ||
| 88 | |||
| 89 | /** | ||
| 90 | * Call <code>getTableDatas(JvmContextFactory.getUserData())</code>. | ||
| 91 | **/ | ||
| 92 | public SnmpTableHandler getTableHandler() { | ||
| 93 | final Map userData = JvmContextFactory.getUserData(); | ||
| 94 | return getTableDatas(userData); | ||
| 95 | } | ||
| 96 | |||
| 97 | |||
| 98 | /** | ||
| 99 | * Return a table handler containing the Thread indexes. | ||
| 100 | * Indexes are computed from the ThreadId. | ||
| 101 | **/ | ||
| 102 | protected SnmpCachedData updateCachedDatas(Object userData) { | ||
| 103 | |||
| 104 | |||
| 105 | // We are getting all the input args | ||
| 106 | final String[] path = | ||
| 107 | JvmRuntimeImpl.getBootClassPath(userData); | ||
| 108 | |||
| 109 | // Time stamp for the cache | ||
| 110 | final long time = System.currentTimeMillis(); | ||
| 111 | final int len = path.length; | ||
| 112 | |||
| 113 | SnmpOid indexes[] = new SnmpOid[len]; | ||
| 114 | |||
| 115 | for(int i = 0; i < len; i++) { | ||
| 116 | indexes[i] = new SnmpOid(i + 1); | ||
| 117 | } | ||
| 118 | |||
| 119 | return new SnmpCachedData(time, indexes, path); | ||
| 120 | } | ||
| 121 | } | ||
| 122 | |||
| 123 | /** | ||
| 124 | * Constructor for the table. Initialize metadata for | ||
| 125 | * "JvmRTBootClassPathTableMeta". | ||
| 126 | * The reference on the MBean server is updated so the entries | ||
| 127 | * created through an SNMP SET will be AUTOMATICALLY REGISTERED | ||
| 128 | * in Java DMK. | ||
| 129 | */ | ||
| 130 | public JvmRTBootClassPathTableMetaImpl(SnmpMib myMib, | ||
| 131 | SnmpStandardObjectServer objserv) { | ||
| 132 | super(myMib, objserv); | ||
| 133 | cache = new JvmRTBootClassPathTableCache(this, -1); | ||
| 134 | } | ||
| 135 | |||
| 136 | // See com.sun.jmx.snmp.agent.SnmpMibTable | ||
| 137 | protected SnmpOid getNextOid(Object userData) | ||
| 138 | throws SnmpStatusException { | ||
| 139 | // null means get the first OID. | ||
| 140 | return getNextOid(null,userData); | ||
| 141 | } | ||
| 142 | |||
| 143 | // See com.sun.jmx.snmp.agent.SnmpMibTable | ||
| 144 | protected SnmpOid getNextOid(SnmpOid oid, Object userData) | ||
| 145 | throws SnmpStatusException { | ||
| 146 | final boolean dbg = log.isDebugOn(); | ||
| 147 | if (dbg) log.debug("getNextOid", "previous=" + oid); | ||
| 148 | |||
| 149 | |||
| 150 | // Get the data handler. | ||
| 151 | // | ||
| 152 | SnmpTableHandler handler = getHandler(userData); | ||
| 153 | if (handler == null) { | ||
| 154 | // This should never happen. | ||
| 155 | // If we get here it's a bug. | ||
| 156 | // | ||
| 157 | if (dbg) log.debug("getNextOid", "handler is null!"); | ||
| 158 | throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | ||
| 159 | } | ||
| 160 | |||
| 161 | // Get the next oid | ||
| 162 | // | ||
| 163 | final SnmpOid next = handler.getNext(oid); | ||
| 164 | if (dbg) log.debug("*** **** **** **** getNextOid", "next=" + next); | ||
| 165 | |||
| 166 | // if next is null: we reached the end of the table. | ||
| 167 | // | ||
| 168 | if (next == null) | ||
| 169 | throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | ||
| 170 | |||
| 171 | return next; | ||
| 172 | } | ||
| 173 | |||
| 174 | |||
| 175 | // See com.sun.jmx.snmp.agent.SnmpMibTable | ||
| 176 | protected boolean contains(SnmpOid oid, Object userData) { | ||
| 177 | |||
| 178 | // Get the handler. | ||
| 179 | // | ||
| 180 | SnmpTableHandler handler = getHandler(userData); | ||
| 181 | |||
| 182 | // handler should never be null. | ||
| 183 | // | ||
| 184 | if (handler == null) | ||
| 185 | return false; | ||
| 186 | |||
| 187 | return handler.contains(oid); | ||
| 188 | } | ||
| 189 | |||
| 190 | // See com.sun.jmx.snmp.agent.SnmpMibTable | ||
| 191 | public Object getEntry(SnmpOid oid) | ||
| 192 | throws SnmpStatusException { | ||
| 193 | final boolean dbg = log.isDebugOn(); | ||
| 194 | if (dbg) log.debug("getEntry", "oid [" + oid + "]"); | ||
| 195 | if (oid == null || oid.getLength() != 1) { | ||
| 196 | if (dbg) log.debug("getEntry", "Invalid oid [" + oid + "]"); | ||
| 197 | throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | ||
| 198 | } | ||
| 199 | |||
| 200 | // Get the request contextual cache (userData). | ||
| 201 | // | ||
| 202 | final Map<Object, Object> m = JvmContextFactory.getUserData(); | ||
| 203 | |||
| 204 | // We're going to use this name to store/retrieve the entry in | ||
| 205 | // the request contextual cache. | ||
| 206 | // | ||
| 207 | // Revisit: Probably better programming to put all these strings | ||
| 208 | // in some interface. | ||
| 209 | // | ||
| 210 | final String entryTag = ((m==null)?null: | ||
| 211 | ("JvmRTBootClassPathTable.entry." + | ||
| 212 | oid.toString())); | ||
| 213 | |||
| 214 | // If the entry is in the cache, simply return it. | ||
| 215 | // | ||
| 216 | if (m != null) { | ||
| 217 | final Object entry = m.get(entryTag); | ||
| 218 | if (entry != null) { | ||
| 219 | if (dbg) | ||
| 220 | log.debug("getEntry", "Entry is already in the cache"); | ||
| 221 | return entry; | ||
| 222 | } else | ||
| 223 | if (dbg) log.debug("getEntry", "Entry is not in the cache"); | ||
| 224 | } | ||
| 225 | |||
| 226 | // The entry was not in the cache, make a new one. | ||
| 227 | // | ||
| 228 | // Get the data hanler. | ||
| 229 | // | ||
| 230 | SnmpTableHandler handler = getHandler(m); | ||
| 231 | |||
| 232 | // handler should never be null. | ||
| 233 | // | ||
| 234 | if (handler == null) | ||
| 235 | throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | ||
| 236 | |||
| 237 | // Get the data associated with our entry. | ||
| 238 | // | ||
| 239 | final Object data = handler.getData(oid); | ||
| 240 | |||
| 241 | // data may be null if the OID we were given is not valid. | ||
| 242 | // | ||
| 243 | if (data == null) | ||
| 244 | throw new SnmpStatusException(SnmpStatusException.noSuchInstance); | ||
| 245 | |||
| 246 | // make the new entry (transient object that will be kept only | ||
| 247 | // for the duration of the request. | ||
| 248 | // | ||
| 249 | if (dbg) | ||
| 250 | log.debug("getEntry","data is a: " + data.getClass().getName()); | ||
| 251 | final Object entry = | ||
| 252 | new JvmRTBootClassPathEntryImpl((String) data, | ||
| 253 | (int) oid.getOidArc(0)); | ||
| 254 | |||
| 255 | // Put the entry in the cache in case we need it later while processing | ||
| 256 | // the request. | ||
| 257 | // | ||
| 258 | if (m != null && entry != null) { | ||
| 259 | m.put(entryTag,entry); | ||
| 260 | } | ||
| 261 | |||
| 262 | return entry; | ||
| 263 | } | ||
| 264 | |||
| 265 | /** | ||
| 266 | * Get the SnmpTableHandler that holds the jvmThreadInstanceTable data. | ||
| 267 | * First look it up in the request contextual cache, and if it is | ||
| 268 | * not found, obtain it from the weak cache. | ||
| 269 | * <br>The request contextual cache will be released at the end of the | ||
| 270 | * current requests, and is used only to process this request. | ||
| 271 | * <br>The weak cache is shared by all requests, and is only | ||
| 272 | * recomputed when it is found to be obsolete. | ||
| 273 | * <br>Note that the data put in the request contextual cache is | ||
| 274 | * never considered to be obsolete, in order to preserve data | ||
| 275 | * coherency. | ||
| 276 | **/ | ||
| 277 | protected SnmpTableHandler getHandler(Object userData) { | ||
| 278 | final Map<Object, Object> m; | ||
| 279 | if (userData instanceof Map) m=Util.cast(userData); | ||
| 280 | else m=null; | ||
| 281 | |||
| 282 | // Look in the contextual cache. | ||
| 283 | if (m != null) { | ||
| 284 | final SnmpTableHandler handler = | ||
| 285 | (SnmpTableHandler)m.get("JvmRTBootClassPathTable.handler"); | ||
| 286 | if (handler != null) return handler; | ||
| 287 | } | ||
| 288 | |||
| 289 | // No handler in contextual cache, make a new one. | ||
| 290 | final SnmpTableHandler handler = cache.getTableHandler(); | ||
| 291 | |||
| 292 | if (m != null && handler != null ) | ||
| 293 | m.put("JvmRTBootClassPathTable.handler",handler); | ||
| 294 | |||
| 295 | return handler; | ||
| 296 | } | ||
| 297 | |||
| 298 | static final MibLogger log = | ||
| 299 | new MibLogger(JvmRTBootClassPathTableMetaImpl.class); | ||
| 300 | } | ||