J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999-2007 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.management.monitor; |
| 27 | |
| 28 | import static com.sun.jmx.defaults.JmxProperties.MONITOR_LOGGER; |
| 29 | import java.util.logging.Level; |
| 30 | import javax.management.ObjectName; |
| 31 | import javax.management.MBeanNotificationInfo; |
| 32 | import static javax.management.monitor.Monitor.NumericalType.*; |
| 33 | import static javax.management.monitor.MonitorNotification.*; |
| 34 | |
| 35 | /** |
| 36 | * Defines a monitor MBean designed to observe the values of a counter |
| 37 | * attribute. |
| 38 | * |
| 39 | * <P> A counter monitor sends a {@link |
| 40 | * MonitorNotification#THRESHOLD_VALUE_EXCEEDED threshold |
| 41 | * notification} when the value of the counter reaches or exceeds a |
| 42 | * threshold known as the comparison level. The notify flag must be |
| 43 | * set to <CODE>true</CODE>. |
| 44 | * |
| 45 | * <P> In addition, an offset mechanism enables particular counting |
| 46 | * intervals to be detected. If the offset value is not zero, |
| 47 | * whenever the threshold is triggered by the counter value reaching a |
| 48 | * comparison level, that comparison level is incremented by the |
| 49 | * offset value. This is regarded as taking place instantaneously, |
| 50 | * that is, before the count is incremented. Thus, for each level, |
| 51 | * the threshold triggers an event notification every time the count |
| 52 | * increases by an interval equal to the offset value. |
| 53 | * |
| 54 | * <P> If the counter can wrap around its maximum value, the modulus |
| 55 | * needs to be specified. The modulus is the value at which the |
| 56 | * counter is reset to zero. |
| 57 | * |
| 58 | * <P> If the counter difference mode is used, the value of the |
| 59 | * derived gauge is calculated as the difference between the observed |
| 60 | * counter values for two successive observations. If this difference |
| 61 | * is negative, the value of the derived gauge is incremented by the |
| 62 | * value of the modulus. The derived gauge value (V[t]) is calculated |
| 63 | * using the following method: |
| 64 | * |
| 65 | * <UL> |
| 66 | * <LI>if (counter[t] - counter[t-GP]) is positive then |
| 67 | * V[t] = counter[t] - counter[t-GP] |
| 68 | * <LI>if (counter[t] - counter[t-GP]) is negative then |
| 69 | * V[t] = counter[t] - counter[t-GP] + MODULUS |
| 70 | * </UL> |
| 71 | * |
| 72 | * This implementation of the counter monitor requires the observed |
| 73 | * attribute to be of the type integer (<CODE>Byte</CODE>, |
| 74 | * <CODE>Integer</CODE>, <CODE>Short</CODE>, <CODE>Long</CODE>). |
| 75 | * |
| 76 | * |
| 77 | * @since 1.5 |
| 78 | */ |
| 79 | public class CounterMonitor extends Monitor implements CounterMonitorMBean { |
| 80 | |
| 81 | /* |
| 82 | * ------------------------------------------ |
| 83 | * PACKAGE CLASSES |
| 84 | * ------------------------------------------ |
| 85 | */ |
| 86 | |
| 87 | static class CounterMonitorObservedObject extends ObservedObject { |
| 88 | |
| 89 | public CounterMonitorObservedObject(ObjectName observedObject) { |
| 90 | super(observedObject); |
| 91 | } |
| 92 | |
| 93 | public final synchronized Number getThreshold() { |
| 94 | return threshold; |
| 95 | } |
| 96 | public final synchronized void setThreshold(Number threshold) { |
| 97 | this.threshold = threshold; |
| 98 | } |
| 99 | public final synchronized Number getPreviousScanCounter() { |
| 100 | return previousScanCounter; |
| 101 | } |
| 102 | public final synchronized void setPreviousScanCounter( |
| 103 | Number previousScanCounter) { |
| 104 | this.previousScanCounter = previousScanCounter; |
| 105 | } |
| 106 | public final synchronized boolean getModulusExceeded() { |
| 107 | return modulusExceeded; |
| 108 | } |
| 109 | public final synchronized void setModulusExceeded( |
| 110 | boolean modulusExceeded) { |
| 111 | this.modulusExceeded = modulusExceeded; |
| 112 | } |
| 113 | public final synchronized Number getDerivedGaugeExceeded() { |
| 114 | return derivedGaugeExceeded; |
| 115 | } |
| 116 | public final synchronized void setDerivedGaugeExceeded( |
| 117 | Number derivedGaugeExceeded) { |
| 118 | this.derivedGaugeExceeded = derivedGaugeExceeded; |
| 119 | } |
| 120 | public final synchronized boolean getDerivedGaugeValid() { |
| 121 | return derivedGaugeValid; |
| 122 | } |
| 123 | public final synchronized void setDerivedGaugeValid( |
| 124 | boolean derivedGaugeValid) { |
| 125 | this.derivedGaugeValid = derivedGaugeValid; |
| 126 | } |
| 127 | public final synchronized boolean getEventAlreadyNotified() { |
| 128 | return eventAlreadyNotified; |
| 129 | } |
| 130 | public final synchronized void setEventAlreadyNotified( |
| 131 | boolean eventAlreadyNotified) { |
| 132 | this.eventAlreadyNotified = eventAlreadyNotified; |
| 133 | } |
| 134 | public final synchronized NumericalType getType() { |
| 135 | return type; |
| 136 | } |
| 137 | public final synchronized void setType(NumericalType type) { |
| 138 | this.type = type; |
| 139 | } |
| 140 | |
| 141 | private Number threshold; |
| 142 | private Number previousScanCounter; |
| 143 | private boolean modulusExceeded; |
| 144 | private Number derivedGaugeExceeded; |
| 145 | private boolean derivedGaugeValid; |
| 146 | private boolean eventAlreadyNotified; |
| 147 | private NumericalType type; |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * ------------------------------------------ |
| 152 | * PRIVATE VARIABLES |
| 153 | * ------------------------------------------ |
| 154 | */ |
| 155 | |
| 156 | /** |
| 157 | * Counter modulus. |
| 158 | * <BR>The default value is a null Integer object. |
| 159 | */ |
| 160 | private Number modulus = INTEGER_ZERO; |
| 161 | |
| 162 | /** |
| 163 | * Counter offset. |
| 164 | * <BR>The default value is a null Integer object. |
| 165 | */ |
| 166 | private Number offset = INTEGER_ZERO; |
| 167 | |
| 168 | /** |
| 169 | * Flag indicating if the counter monitor notifies when exceeding |
| 170 | * the threshold. The default value is set to |
| 171 | * <CODE>false</CODE>. |
| 172 | */ |
| 173 | private boolean notify = false; |
| 174 | |
| 175 | /** |
| 176 | * Flag indicating if the counter difference mode is used. If the |
| 177 | * counter difference mode is used, the derived gauge is the |
| 178 | * difference between two consecutive observed values. Otherwise, |
| 179 | * the derived gauge is directly the value of the observed |
| 180 | * attribute. The default value is set to <CODE>false</CODE>. |
| 181 | */ |
| 182 | private boolean differenceMode = false; |
| 183 | |
| 184 | /** |
| 185 | * Initial counter threshold. This value is used to initialize |
| 186 | * the threshold when a new object is added to the list and reset |
| 187 | * the threshold to its initial value each time the counter |
| 188 | * resets. |
| 189 | */ |
| 190 | private Number initThreshold = INTEGER_ZERO; |
| 191 | |
| 192 | private static final String[] types = { |
| 193 | RUNTIME_ERROR, |
| 194 | OBSERVED_OBJECT_ERROR, |
| 195 | OBSERVED_ATTRIBUTE_ERROR, |
| 196 | OBSERVED_ATTRIBUTE_TYPE_ERROR, |
| 197 | THRESHOLD_ERROR, |
| 198 | THRESHOLD_VALUE_EXCEEDED |
| 199 | }; |
| 200 | |
| 201 | private static final MBeanNotificationInfo[] notifsInfo = { |
| 202 | new MBeanNotificationInfo( |
| 203 | types, |
| 204 | "javax.management.monitor.MonitorNotification", |
| 205 | "Notifications sent by the CounterMonitor MBean") |
| 206 | }; |
| 207 | |
| 208 | /* |
| 209 | * ------------------------------------------ |
| 210 | * CONSTRUCTORS |
| 211 | * ------------------------------------------ |
| 212 | */ |
| 213 | |
| 214 | /** |
| 215 | * Default constructor. |
| 216 | */ |
| 217 | public CounterMonitor() { |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * ------------------------------------------ |
| 222 | * PUBLIC METHODS |
| 223 | * ------------------------------------------ |
| 224 | */ |
| 225 | |
| 226 | /** |
| 227 | * Starts the counter monitor. |
| 228 | */ |
| 229 | public synchronized void start() { |
| 230 | if (isActive()) { |
| 231 | MONITOR_LOGGER.logp(Level.FINER, CounterMonitor.class.getName(), |
| 232 | "start", "the monitor is already active"); |
| 233 | return; |
| 234 | } |
| 235 | // Reset values. |
| 236 | // |
| 237 | for (ObservedObject o : observedObjects) { |
| 238 | final CounterMonitorObservedObject cmo = |
| 239 | (CounterMonitorObservedObject) o; |
| 240 | cmo.setThreshold(initThreshold); |
| 241 | cmo.setModulusExceeded(false); |
| 242 | cmo.setEventAlreadyNotified(false); |
| 243 | cmo.setPreviousScanCounter(null); |
| 244 | } |
| 245 | doStart(); |
| 246 | } |
| 247 | |
| 248 | /** |
| 249 | * Stops the counter monitor. |
| 250 | */ |
| 251 | public synchronized void stop() { |
| 252 | doStop(); |
| 253 | } |
| 254 | |
| 255 | // GETTERS AND SETTERS |
| 256 | //-------------------- |
| 257 | |
| 258 | /** |
| 259 | * Gets the derived gauge of the specified object, if this object is |
| 260 | * contained in the set of observed MBeans, or <code>null</code> otherwise. |
| 261 | * |
| 262 | * @param object the name of the object whose derived gauge is to |
| 263 | * be returned. |
| 264 | * |
| 265 | * @return The derived gauge of the specified object. |
| 266 | * |
| 267 | */ |
| 268 | public synchronized Number getDerivedGauge(ObjectName object) { |
| 269 | return (Number) super.getDerivedGauge(object); |
| 270 | } |
| 271 | |
| 272 | /** |
| 273 | * Gets the derived gauge timestamp of the specified object, if |
| 274 | * this object is contained in the set of observed MBeans, or |
| 275 | * <code>0</code> otherwise. |
| 276 | * |
| 277 | * @param object the name of the object whose derived gauge |
| 278 | * timestamp is to be returned. |
| 279 | * |
| 280 | * @return The derived gauge timestamp of the specified object. |
| 281 | * |
| 282 | */ |
| 283 | public synchronized long getDerivedGaugeTimeStamp(ObjectName object) { |
| 284 | return super.getDerivedGaugeTimeStamp(object); |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Gets the current threshold value of the specified object, if |
| 289 | * this object is contained in the set of observed MBeans, or |
| 290 | * <code>null</code> otherwise. |
| 291 | * |
| 292 | * @param object the name of the object whose threshold is to be |
| 293 | * returned. |
| 294 | * |
| 295 | * @return The threshold value of the specified object. |
| 296 | * |
| 297 | */ |
| 298 | public synchronized Number getThreshold(ObjectName object) { |
| 299 | final CounterMonitorObservedObject o = |
| 300 | (CounterMonitorObservedObject) getObservedObject(object); |
| 301 | if (o == null) |
| 302 | return null; |
| 303 | |
| 304 | // If the counter that is monitored rolls over when it reaches a |
| 305 | // maximum value, then the modulus value needs to be set to that |
| 306 | // maximum value. The threshold will then also roll over whenever |
| 307 | // it strictly exceeds the modulus value. When the threshold rolls |
| 308 | // over, it is reset to the value that was specified through the |
| 309 | // latest call to the monitor's setInitThreshold method, before |
| 310 | // any offsets were applied. |
| 311 | // |
| 312 | if (offset.longValue() > 0L && |
| 313 | modulus.longValue() > 0L && |
| 314 | o.getThreshold().longValue() > modulus.longValue()) { |
| 315 | return initThreshold; |
| 316 | } else { |
| 317 | return o.getThreshold(); |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | /** |
| 322 | * Gets the initial threshold value common to all observed objects. |
| 323 | * |
| 324 | * @return The initial threshold. |
| 325 | * |
| 326 | * @see #setInitThreshold |
| 327 | * |
| 328 | */ |
| 329 | public synchronized Number getInitThreshold() { |
| 330 | return initThreshold; |
| 331 | } |
| 332 | |
| 333 | /** |
| 334 | * Sets the initial threshold value common to all observed objects. |
| 335 | * |
| 336 | * <BR>The current threshold of every object in the set of |
| 337 | * observed MBeans is updated consequently. |
| 338 | * |
| 339 | * @param value The initial threshold value. |
| 340 | * |
| 341 | * @exception IllegalArgumentException The specified |
| 342 | * threshold is null or the threshold value is less than zero. |
| 343 | * |
| 344 | * @see #getInitThreshold |
| 345 | * |
| 346 | */ |
| 347 | public synchronized void setInitThreshold(Number value) |
| 348 | throws IllegalArgumentException { |
| 349 | |
| 350 | if (value == null) { |
| 351 | throw new IllegalArgumentException("Null threshold"); |
| 352 | } |
| 353 | if (value.longValue() < 0L) { |
| 354 | throw new IllegalArgumentException("Negative threshold"); |
| 355 | } |
| 356 | |
| 357 | if (initThreshold.equals(value)) |
| 358 | return; |
| 359 | initThreshold = value; |
| 360 | |
| 361 | // Reset values. |
| 362 | // |
| 363 | int index = 0; |
| 364 | for (ObservedObject o : observedObjects) { |
| 365 | resetAlreadyNotified(o, index++, THRESHOLD_ERROR_NOTIFIED); |
| 366 | final CounterMonitorObservedObject cmo = |
| 367 | (CounterMonitorObservedObject) o; |
| 368 | cmo.setThreshold(value); |
| 369 | cmo.setModulusExceeded(false); |
| 370 | cmo.setEventAlreadyNotified(false); |
| 371 | } |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * Returns the derived gauge of the first object in the set of |
| 376 | * observed MBeans. |
| 377 | * |
| 378 | * @return The derived gauge. |
| 379 | * |
| 380 | * @deprecated As of JMX 1.2, replaced by |
| 381 | * {@link #getDerivedGauge(ObjectName)} |
| 382 | */ |
| 383 | @Deprecated |
| 384 | public synchronized Number getDerivedGauge() { |
| 385 | if (observedObjects.isEmpty()) { |
| 386 | return null; |
| 387 | } else { |
| 388 | return (Number) observedObjects.get(0).getDerivedGauge(); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | /** |
| 393 | * Gets the derived gauge timestamp of the first object in the set |
| 394 | * of observed MBeans. |
| 395 | * |
| 396 | * @return The derived gauge timestamp. |
| 397 | * |
| 398 | * @deprecated As of JMX 1.2, replaced by |
| 399 | * {@link #getDerivedGaugeTimeStamp(ObjectName)} |
| 400 | */ |
| 401 | @Deprecated |
| 402 | public synchronized long getDerivedGaugeTimeStamp() { |
| 403 | if (observedObjects.isEmpty()) { |
| 404 | return 0; |
| 405 | } else { |
| 406 | return observedObjects.get(0).getDerivedGaugeTimeStamp(); |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | /** |
| 411 | * Gets the threshold value of the first object in the set of |
| 412 | * observed MBeans. |
| 413 | * |
| 414 | * @return The threshold value. |
| 415 | * |
| 416 | * @see #setThreshold |
| 417 | * |
| 418 | * @deprecated As of JMX 1.2, replaced by {@link #getThreshold(ObjectName)} |
| 419 | */ |
| 420 | @Deprecated |
| 421 | public synchronized Number getThreshold() { |
| 422 | return getThreshold(getObservedObject()); |
| 423 | } |
| 424 | |
| 425 | /** |
| 426 | * Sets the initial threshold value. |
| 427 | * |
| 428 | * @param value The initial threshold value. |
| 429 | * |
| 430 | * @exception IllegalArgumentException The specified threshold is |
| 431 | * null or the threshold value is less than zero. |
| 432 | * |
| 433 | * @see #getThreshold() |
| 434 | * |
| 435 | * @deprecated As of JMX 1.2, replaced by {@link #setInitThreshold} |
| 436 | */ |
| 437 | @Deprecated |
| 438 | public synchronized void setThreshold(Number value) |
| 439 | throws IllegalArgumentException { |
| 440 | setInitThreshold(value); |
| 441 | } |
| 442 | |
| 443 | /** |
| 444 | * Gets the offset value common to all observed MBeans. |
| 445 | * |
| 446 | * @return The offset value. |
| 447 | * |
| 448 | * @see #setOffset |
| 449 | */ |
| 450 | public synchronized Number getOffset() { |
| 451 | return offset; |
| 452 | } |
| 453 | |
| 454 | /** |
| 455 | * Sets the offset value common to all observed MBeans. |
| 456 | * |
| 457 | * @param value The offset value. |
| 458 | * |
| 459 | * @exception IllegalArgumentException The specified |
| 460 | * offset is null or the offset value is less than zero. |
| 461 | * |
| 462 | * @see #getOffset |
| 463 | */ |
| 464 | public synchronized void setOffset(Number value) |
| 465 | throws IllegalArgumentException { |
| 466 | |
| 467 | if (value == null) { |
| 468 | throw new IllegalArgumentException("Null offset"); |
| 469 | } |
| 470 | if (value.longValue() < 0L) { |
| 471 | throw new IllegalArgumentException("Negative offset"); |
| 472 | } |
| 473 | |
| 474 | if (offset.equals(value)) |
| 475 | return; |
| 476 | offset = value; |
| 477 | |
| 478 | int index = 0; |
| 479 | for (ObservedObject o : observedObjects) { |
| 480 | resetAlreadyNotified(o, index++, THRESHOLD_ERROR_NOTIFIED); |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | /** |
| 485 | * Gets the modulus value common to all observed MBeans. |
| 486 | * |
| 487 | * @see #setModulus |
| 488 | * |
| 489 | * @return The modulus value. |
| 490 | */ |
| 491 | public synchronized Number getModulus() { |
| 492 | return modulus; |
| 493 | } |
| 494 | |
| 495 | /** |
| 496 | * Sets the modulus value common to all observed MBeans. |
| 497 | * |
| 498 | * @param value The modulus value. |
| 499 | * |
| 500 | * @exception IllegalArgumentException The specified |
| 501 | * modulus is null or the modulus value is less than zero. |
| 502 | * |
| 503 | * @see #getModulus |
| 504 | */ |
| 505 | public synchronized void setModulus(Number value) |
| 506 | throws IllegalArgumentException { |
| 507 | |
| 508 | if (value == null) { |
| 509 | throw new IllegalArgumentException("Null modulus"); |
| 510 | } |
| 511 | if (value.longValue() < 0L) { |
| 512 | throw new IllegalArgumentException("Negative modulus"); |
| 513 | } |
| 514 | |
| 515 | if (modulus.equals(value)) |
| 516 | return; |
| 517 | modulus = value; |
| 518 | |
| 519 | // Reset values. |
| 520 | // |
| 521 | int index = 0; |
| 522 | for (ObservedObject o : observedObjects) { |
| 523 | resetAlreadyNotified(o, index++, THRESHOLD_ERROR_NOTIFIED); |
| 524 | final CounterMonitorObservedObject cmo = |
| 525 | (CounterMonitorObservedObject) o; |
| 526 | cmo.setModulusExceeded(false); |
| 527 | } |
| 528 | } |
| 529 | |
| 530 | /** |
| 531 | * Gets the notification's on/off switch value common to all |
| 532 | * observed MBeans. |
| 533 | * |
| 534 | * @return <CODE>true</CODE> if the counter monitor notifies when |
| 535 | * exceeding the threshold, <CODE>false</CODE> otherwise. |
| 536 | * |
| 537 | * @see #setNotify |
| 538 | */ |
| 539 | public synchronized boolean getNotify() { |
| 540 | return notify; |
| 541 | } |
| 542 | |
| 543 | /** |
| 544 | * Sets the notification's on/off switch value common to all |
| 545 | * observed MBeans. |
| 546 | * |
| 547 | * @param value The notification's on/off switch value. |
| 548 | * |
| 549 | * @see #getNotify |
| 550 | */ |
| 551 | public synchronized void setNotify(boolean value) { |
| 552 | if (notify == value) |
| 553 | return; |
| 554 | notify = value; |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * Gets the difference mode flag value common to all observed MBeans. |
| 559 | * |
| 560 | * @return <CODE>true</CODE> if the difference mode is used, |
| 561 | * <CODE>false</CODE> otherwise. |
| 562 | * |
| 563 | * @see #setDifferenceMode |
| 564 | */ |
| 565 | public synchronized boolean getDifferenceMode() { |
| 566 | return differenceMode; |
| 567 | } |
| 568 | |
| 569 | /** |
| 570 | * Sets the difference mode flag value common to all observed MBeans. |
| 571 | * |
| 572 | * @param value The difference mode flag value. |
| 573 | * |
| 574 | * @see #getDifferenceMode |
| 575 | */ |
| 576 | public synchronized void setDifferenceMode(boolean value) { |
| 577 | if (differenceMode == value) |
| 578 | return; |
| 579 | differenceMode = value; |
| 580 | |
| 581 | // Reset values. |
| 582 | // |
| 583 | for (ObservedObject o : observedObjects) { |
| 584 | final CounterMonitorObservedObject cmo = |
| 585 | (CounterMonitorObservedObject) o; |
| 586 | cmo.setThreshold(initThreshold); |
| 587 | cmo.setModulusExceeded(false); |
| 588 | cmo.setEventAlreadyNotified(false); |
| 589 | cmo.setPreviousScanCounter(null); |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | /** |
| 594 | * Returns a <CODE>NotificationInfo</CODE> object containing the |
| 595 | * name of the Java class of the notification and the notification |
| 596 | * types sent by the counter monitor. |
| 597 | */ |
| 598 | public MBeanNotificationInfo[] getNotificationInfo() { |
| 599 | return notifsInfo; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * ------------------------------------------ |
| 604 | * PRIVATE METHODS |
| 605 | * ------------------------------------------ |
| 606 | */ |
| 607 | |
| 608 | /** |
| 609 | * Updates the derived gauge attribute of the observed object. |
| 610 | * |
| 611 | * @param scanCounter The value of the observed attribute. |
| 612 | * @param o The observed object. |
| 613 | * @return <CODE>true</CODE> if the derived gauge value is valid, |
| 614 | * <CODE>false</CODE> otherwise. The derived gauge value is |
| 615 | * invalid when the differenceMode flag is set to |
| 616 | * <CODE>true</CODE> and it is the first notification (so we |
| 617 | * haven't 2 consecutive values to update the derived gauge). |
| 618 | */ |
| 619 | private synchronized boolean updateDerivedGauge( |
| 620 | Object scanCounter, CounterMonitorObservedObject o) { |
| 621 | |
| 622 | boolean is_derived_gauge_valid; |
| 623 | |
| 624 | // The counter difference mode is used. |
| 625 | // |
| 626 | if (differenceMode) { |
| 627 | |
| 628 | // The previous scan counter has been initialized. |
| 629 | // |
| 630 | if (o.getPreviousScanCounter() != null) { |
| 631 | setDerivedGaugeWithDifference((Number)scanCounter, null, o); |
| 632 | |
| 633 | // If derived gauge is negative it means that the |
| 634 | // counter has wrapped around and the value of the |
| 635 | // threshold needs to be reset to its initial value. |
| 636 | // |
| 637 | if (((Number)o.getDerivedGauge()).longValue() < 0L) { |
| 638 | if (modulus.longValue() > 0L) { |
| 639 | setDerivedGaugeWithDifference((Number)scanCounter, |
| 640 | modulus, o); |
| 641 | } |
| 642 | o.setThreshold(initThreshold); |
| 643 | o.setEventAlreadyNotified(false); |
| 644 | } |
| 645 | is_derived_gauge_valid = true; |
| 646 | } |
| 647 | // The previous scan counter has not been initialized. |
| 648 | // We cannot update the derived gauge... |
| 649 | // |
| 650 | else { |
| 651 | is_derived_gauge_valid = false; |
| 652 | } |
| 653 | o.setPreviousScanCounter((Number)scanCounter); |
| 654 | } |
| 655 | // The counter difference mode is not used. |
| 656 | // |
| 657 | else { |
| 658 | o.setDerivedGauge((Number)scanCounter); |
| 659 | is_derived_gauge_valid = true; |
| 660 | } |
| 661 | return is_derived_gauge_valid; |
| 662 | } |
| 663 | |
| 664 | /** |
| 665 | * Updates the notification attribute of the observed object |
| 666 | * and notifies the listeners only once if the notify flag |
| 667 | * is set to <CODE>true</CODE>. |
| 668 | * @param o The observed object. |
| 669 | */ |
| 670 | private synchronized MonitorNotification updateNotifications( |
| 671 | CounterMonitorObservedObject o) { |
| 672 | |
| 673 | MonitorNotification n = null; |
| 674 | |
| 675 | // Send notification if notify is true. |
| 676 | // |
| 677 | if (!o.getEventAlreadyNotified()) { |
| 678 | if (((Number)o.getDerivedGauge()).longValue() >= |
| 679 | o.getThreshold().longValue()) { |
| 680 | if (notify) { |
| 681 | n = new MonitorNotification(THRESHOLD_VALUE_EXCEEDED, |
| 682 | this, |
| 683 | 0, |
| 684 | 0, |
| 685 | "", |
| 686 | null, |
| 687 | null, |
| 688 | null, |
| 689 | o.getThreshold()); |
| 690 | } |
| 691 | if (!differenceMode) { |
| 692 | o.setEventAlreadyNotified(true); |
| 693 | } |
| 694 | } |
| 695 | } else { |
| 696 | if (MONITOR_LOGGER.isLoggable(Level.FINER)) { |
| 697 | final StringBuilder strb = new StringBuilder() |
| 698 | .append("The notification:") |
| 699 | .append("\n\tNotification observed object = ") |
| 700 | .append(o.getObservedObject()) |
| 701 | .append("\n\tNotification observed attribute = ") |
| 702 | .append(getObservedAttribute()) |
| 703 | .append("\n\tNotification threshold level = ") |
| 704 | .append(o.getThreshold()) |
| 705 | .append("\n\tNotification derived gauge = ") |
| 706 | .append(o.getDerivedGauge()) |
| 707 | .append("\nhas already been sent"); |
| 708 | MONITOR_LOGGER.logp(Level.FINER, CounterMonitor.class.getName(), |
| 709 | "updateNotifications", strb.toString()); |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | return n; |
| 714 | } |
| 715 | |
| 716 | /** |
| 717 | * Updates the threshold attribute of the observed object. |
| 718 | * @param o The observed object. |
| 719 | */ |
| 720 | private synchronized void updateThreshold(CounterMonitorObservedObject o) { |
| 721 | |
| 722 | // Calculate the new threshold value if the threshold has been |
| 723 | // exceeded and if the offset value is greater than zero. |
| 724 | // |
| 725 | if (((Number)o.getDerivedGauge()).longValue() >= |
| 726 | o.getThreshold().longValue()) { |
| 727 | |
| 728 | if (offset.longValue() > 0L) { |
| 729 | |
| 730 | // Increment the threshold until its value is greater |
| 731 | // than the one for the current derived gauge. |
| 732 | // |
| 733 | long threshold_value = o.getThreshold().longValue(); |
| 734 | while (((Number)o.getDerivedGauge()).longValue() >= |
| 735 | threshold_value) { |
| 736 | threshold_value += offset.longValue(); |
| 737 | } |
| 738 | |
| 739 | // Set threshold attribute. |
| 740 | // |
| 741 | switch (o.getType()) { |
| 742 | case INTEGER: |
| 743 | o.setThreshold(new Integer((int)threshold_value)); |
| 744 | break; |
| 745 | case BYTE: |
| 746 | o.setThreshold(new Byte((byte)threshold_value)); |
| 747 | break; |
| 748 | case SHORT: |
| 749 | o.setThreshold(new Short((short)threshold_value)); |
| 750 | break; |
| 751 | case LONG: |
| 752 | o.setThreshold(new Long(threshold_value)); |
| 753 | break; |
| 754 | default: |
| 755 | // Should never occur... |
| 756 | MONITOR_LOGGER.logp(Level.FINEST, |
| 757 | CounterMonitor.class.getName(), |
| 758 | "updateThreshold", |
| 759 | "the threshold type is invalid"); |
| 760 | break; |
| 761 | } |
| 762 | |
| 763 | // If the counter can wrap around when it reaches |
| 764 | // its maximum and we are not dealing with counter |
| 765 | // differences then we need to reset the threshold |
| 766 | // to its initial value too. |
| 767 | // |
| 768 | if (!differenceMode) { |
| 769 | if (modulus.longValue() > 0L) { |
| 770 | if (o.getThreshold().longValue() > |
| 771 | modulus.longValue()) { |
| 772 | o.setModulusExceeded(true); |
| 773 | o.setDerivedGaugeExceeded( |
| 774 | (Number) o.getDerivedGauge()); |
| 775 | } |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | // Threshold value has been modified so we can notify again. |
| 780 | // |
| 781 | o.setEventAlreadyNotified(false); |
| 782 | } else { |
| 783 | o.setModulusExceeded(true); |
| 784 | o.setDerivedGaugeExceeded((Number) o.getDerivedGauge()); |
| 785 | } |
| 786 | } |
| 787 | } |
| 788 | |
| 789 | /** |
| 790 | * Sets the derived gauge of the specified observed object when the |
| 791 | * differenceMode flag is set to <CODE>true</CODE>. Integer types |
| 792 | * only are allowed. |
| 793 | * |
| 794 | * @param scanCounter The value of the observed attribute. |
| 795 | * @param mod The counter modulus value. |
| 796 | * @param o The observed object. |
| 797 | */ |
| 798 | private synchronized void setDerivedGaugeWithDifference( |
| 799 | Number scanCounter, Number mod, CounterMonitorObservedObject o) { |
| 800 | /* We do the arithmetic using longs here even though the |
| 801 | result may end up in a smaller type. Since |
| 802 | l == (byte)l (mod 256) for any long l, |
| 803 | (byte) ((byte)l1 + (byte)l2) == (byte) (l1 + l2), |
| 804 | and likewise for subtraction. So it's the same as if |
| 805 | we had done the arithmetic in the smaller type.*/ |
| 806 | |
| 807 | long derived = |
| 808 | scanCounter.longValue() - o.getPreviousScanCounter().longValue(); |
| 809 | if (mod != null) |
| 810 | derived += modulus.longValue(); |
| 811 | |
| 812 | switch (o.getType()) { |
| 813 | case INTEGER: o.setDerivedGauge(new Integer((int) derived)); break; |
| 814 | case BYTE: o.setDerivedGauge(new Byte((byte) derived)); break; |
| 815 | case SHORT: o.setDerivedGauge(new Short((short) derived)); break; |
| 816 | case LONG: o.setDerivedGauge(new Long(derived)); break; |
| 817 | default: |
| 818 | // Should never occur... |
| 819 | MONITOR_LOGGER.logp(Level.FINEST, CounterMonitor.class.getName(), |
| 820 | "setDerivedGaugeWithDifference", |
| 821 | "the threshold type is invalid"); |
| 822 | break; |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | /* |
| 827 | * ------------------------------------------ |
| 828 | * PACKAGE METHODS |
| 829 | * ------------------------------------------ |
| 830 | */ |
| 831 | |
| 832 | /** |
| 833 | * Factory method for ObservedObject creation. |
| 834 | * |
| 835 | * @since 1.6 |
| 836 | */ |
| 837 | @Override |
| 838 | ObservedObject createObservedObject(ObjectName object) { |
| 839 | final CounterMonitorObservedObject cmo = |
| 840 | new CounterMonitorObservedObject(object); |
| 841 | cmo.setThreshold(initThreshold); |
| 842 | cmo.setModulusExceeded(false); |
| 843 | cmo.setEventAlreadyNotified(false); |
| 844 | cmo.setPreviousScanCounter(null); |
| 845 | return cmo; |
| 846 | } |
| 847 | |
| 848 | /** |
| 849 | * This method globally sets the derived gauge type for the given |
| 850 | * "object" and "attribute" after checking that the type of the |
| 851 | * supplied observed attribute value is one of the value types |
| 852 | * supported by this monitor. |
| 853 | */ |
| 854 | @Override |
| 855 | synchronized boolean isComparableTypeValid(ObjectName object, |
| 856 | String attribute, |
| 857 | Comparable<?> value) { |
| 858 | final CounterMonitorObservedObject o = |
| 859 | (CounterMonitorObservedObject) getObservedObject(object); |
| 860 | if (o == null) |
| 861 | return false; |
| 862 | |
| 863 | // Check that the observed attribute is of type "Integer". |
| 864 | // |
| 865 | if (value instanceof Integer) { |
| 866 | o.setType(INTEGER); |
| 867 | } else if (value instanceof Byte) { |
| 868 | o.setType(BYTE); |
| 869 | } else if (value instanceof Short) { |
| 870 | o.setType(SHORT); |
| 871 | } else if (value instanceof Long) { |
| 872 | o.setType(LONG); |
| 873 | } else { |
| 874 | return false; |
| 875 | } |
| 876 | return true; |
| 877 | } |
| 878 | |
| 879 | @Override |
| 880 | synchronized Comparable<?> getDerivedGaugeFromComparable( |
| 881 | ObjectName object, |
| 882 | String attribute, |
| 883 | Comparable<?> value) { |
| 884 | final CounterMonitorObservedObject o = |
| 885 | (CounterMonitorObservedObject) getObservedObject(object); |
| 886 | if (o == null) |
| 887 | return null; |
| 888 | |
| 889 | // Check if counter has wrapped around. |
| 890 | // |
| 891 | if (o.getModulusExceeded()) { |
| 892 | if (((Number)o.getDerivedGauge()).longValue() < |
| 893 | o.getDerivedGaugeExceeded().longValue()) { |
| 894 | o.setThreshold(initThreshold); |
| 895 | o.setModulusExceeded(false); |
| 896 | o.setEventAlreadyNotified(false); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | // Update the derived gauge attributes and check the |
| 901 | // validity of the new value. The derived gauge value |
| 902 | // is invalid when the differenceMode flag is set to |
| 903 | // true and it is the first notification, i.e. we |
| 904 | // haven't got 2 consecutive values to update the |
| 905 | // derived gauge. |
| 906 | // |
| 907 | o.setDerivedGaugeValid(updateDerivedGauge(value, o)); |
| 908 | |
| 909 | return (Comparable<?>) o.getDerivedGauge(); |
| 910 | } |
| 911 | |
| 912 | @Override |
| 913 | synchronized void onErrorNotification(MonitorNotification notification) { |
| 914 | final CounterMonitorObservedObject o = (CounterMonitorObservedObject) |
| 915 | getObservedObject(notification.getObservedObject()); |
| 916 | if (o == null) |
| 917 | return; |
| 918 | |
| 919 | // Reset values. |
| 920 | // |
| 921 | o.setModulusExceeded(false); |
| 922 | o.setEventAlreadyNotified(false); |
| 923 | o.setPreviousScanCounter(null); |
| 924 | } |
| 925 | |
| 926 | @Override |
| 927 | synchronized MonitorNotification buildAlarmNotification( |
| 928 | ObjectName object, |
| 929 | String attribute, |
| 930 | Comparable<?> value) { |
| 931 | final CounterMonitorObservedObject o = |
| 932 | (CounterMonitorObservedObject) getObservedObject(object); |
| 933 | if (o == null) |
| 934 | return null; |
| 935 | |
| 936 | // Notify the listeners and update the threshold if |
| 937 | // the updated derived gauge value is valid. |
| 938 | // |
| 939 | final MonitorNotification alarm; |
| 940 | if (o.getDerivedGaugeValid()) { |
| 941 | alarm = updateNotifications(o); |
| 942 | updateThreshold(o); |
| 943 | } else { |
| 944 | alarm = null; |
| 945 | } |
| 946 | return alarm; |
| 947 | } |
| 948 | |
| 949 | /** |
| 950 | * Tests if the threshold, offset and modulus of the specified observed |
| 951 | * object are of the same type as the counter. Only integer types are |
| 952 | * allowed. |
| 953 | * |
| 954 | * Note: |
| 955 | * If the optional offset or modulus have not been initialized, their |
| 956 | * default value is an Integer object with a value equal to zero. |
| 957 | * |
| 958 | * @param object The observed object. |
| 959 | * @param attribute The observed attribute. |
| 960 | * @param value The sample value. |
| 961 | * @return <CODE>true</CODE> if type is the same, |
| 962 | * <CODE>false</CODE> otherwise. |
| 963 | */ |
| 964 | @Override |
| 965 | synchronized boolean isThresholdTypeValid(ObjectName object, |
| 966 | String attribute, |
| 967 | Comparable<?> value) { |
| 968 | final CounterMonitorObservedObject o = |
| 969 | (CounterMonitorObservedObject) getObservedObject(object); |
| 970 | if (o == null) |
| 971 | return false; |
| 972 | |
| 973 | Class<? extends Number> c = classForType(o.getType()); |
| 974 | return (c.isInstance(o.getThreshold()) && |
| 975 | isValidForType(offset, c) && |
| 976 | isValidForType(modulus, c)); |
| 977 | } |
| 978 | } |