ctf/org.eclipse.tracecompass.tmf.ctf.core/src/org/eclipse/tracecompass/internal/tmf/ctf/core/trace/iterator/CtfIterator.java

   1 /*******************************************************************************
   2  * Copyright (c) 2012, 2014 Ericsson, École Polytechnique de Montréal
   3  *
   4  * All rights reserved. This program and the accompanying materials are made
   5  * available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Matthew Khouzam - Initial API and implementation
  11  *   Florian Wininger - Performance improvements
  12  *******************************************************************************/
  13
  14 package org.eclipse.tracecompass.internal.tmf.ctf.core.trace.iterator;
  15
  16 import static org.eclipse.tracecompass.common.core.NonNullUtils.equalsNullable;
  17
  18 import org.eclipse.tracecompass.ctf.core.CTFException;
  19 import org.eclipse.tracecompass.ctf.core.event.EventDefinition;
  20 import org.eclipse.tracecompass.ctf.core.trace.CTFStreamInputReader;
  21 import org.eclipse.tracecompass.ctf.core.trace.CTFTrace;
  22 import org.eclipse.tracecompass.ctf.core.trace.CTFTraceReader;
  23 import org.eclipse.tracecompass.internal.tmf.ctf.core.Activator;
  24 import org.eclipse.tracecompass.tmf.core.trace.ITmfContext;
  25 import org.eclipse.tracecompass.tmf.core.trace.location.ITmfLocation;
  26 import org.eclipse.tracecompass.tmf.ctf.core.context.CtfLocation;
  27 import org.eclipse.tracecompass.tmf.ctf.core.context.CtfLocationInfo;
  28 import org.eclipse.tracecompass.tmf.ctf.core.event.CtfTmfEvent;
  29 import org.eclipse.tracecompass.tmf.ctf.core.event.CtfTmfEventFactory;
  30 import org.eclipse.tracecompass.tmf.ctf.core.trace.CtfTmfTrace;
  31
  32 /**
  33  * The CTF trace reader iterator.
  34  *
  35  * It doesn't reserve a file handle, so many iterators can be used without
  36  * worries of I/O errors or resource exhaustion.
  37  *
  38  * @author Matthew Khouzam
  39  */
  40 public class CtfIterator extends CTFTraceReader
  41         implements ITmfContext, Comparable<CtfIterator> {
  42
  43     /** An invalid location */
  44     public static final CtfLocation NULL_LOCATION = new CtfLocation(CtfLocation.INVALID_LOCATION);
  45
  46     private final CtfTmfTrace fTrace;
  47
  48     private CtfLocation fCurLocation;
  49     private long fCurRank;
  50
  51     private CtfLocation fPreviousLocation;
  52     private CtfTmfEvent fPreviousEvent;
  53
  54     // ------------------------------------------------------------------------
  55     // Constructors
  56     // ------------------------------------------------------------------------
  57
  58     /**
  59      * Create a new CTF trace iterator, which initially points at the first
  60      * event in the trace.
  61      *
  62      * @param ctfTrace
  63      *            The {@link CTFTrace} linked to the trace. It should be
  64      *            provided by the corresponding 'ctfTmfTrace'.
  65      *
  66      * @param ctfTmfTrace
  67      *            The {@link CtfTmfTrace} to iterate over
  68      * @throws CTFException
  69      *             If the iterator couldn't not be instantiated, probably due to
  70      *             a read error.
  71      */
  72     public CtfIterator(CTFTrace ctfTrace, CtfTmfTrace ctfTmfTrace) throws CTFException {
  73         super(ctfTrace);
  74         fTrace = ctfTmfTrace;
  75         if (hasMoreEvents()) {
  76             fCurLocation = new CtfLocation(ctfTmfTrace.getStartTime());
  77             fCurRank = 0;
  78         } else {
  79             setUnknownLocation();
  80         }
  81     }
  82
  83     /**
  84      * Create a new CTF trace iterator, which will initially point to the given
  85      * location/rank.
  86      *
  87      * @param ctfTrace
  88      *            The {@link CTFTrace} linked to the trace. It should be
  89      *            provided by the corresponding 'ctfTmfTrace'.
  90      * @param ctfTmfTrace
  91      *            The {@link CtfTmfTrace} to iterate over
  92      * @param ctfLocationData
  93      *            The initial timestamp the iterator will be pointing to
  94      * @param rank
  95      *            The initial rank
  96      * @throws CTFException
  97      *             If the iterator couldn't not be instantiated, probably due to
  98      *             a read error.
  99      */
 100     public CtfIterator(CTFTrace ctfTrace, CtfTmfTrace ctfTmfTrace, CtfLocationInfo ctfLocationData, long rank)
 101             throws CTFException {
 102         super(ctfTrace);
 103
 104         this.fTrace = ctfTmfTrace;
 105         if (this.hasMoreEvents()) {
 106             this.fCurLocation = new CtfLocation(ctfLocationData);
 107             if (this.getCurrentEvent().getTimestamp().getValue() != ctfLocationData.getTimestamp()) {
 108                 this.seek(ctfLocationData);
 109                 this.fCurRank = rank;
 110             }
 111         } else {
 112             setUnknownLocation();
 113         }
 114     }
 115
 116     @Override
 117     public void dispose() {
 118         close();
 119     }
 120
 121     private void setUnknownLocation() {
 122         fCurLocation = NULL_LOCATION;
 123         fCurRank = UNKNOWN_RANK;
 124     }
 125
 126     // ------------------------------------------------------------------------
 127     // Accessors
 128     // ------------------------------------------------------------------------
 129
 130     /**
 131      * Return this iterator's trace.
 132      *
 133      * @return CtfTmfTrace The iterator's trace
 134      */
 135     public CtfTmfTrace getCtfTmfTrace() {
 136         return fTrace;
 137     }
 138
 139     /**
 140      * Return the current event pointed to by the iterator.
 141      *
 142      * @return CtfTmfEvent The current event
 143      */
 144     public synchronized CtfTmfEvent getCurrentEvent() {
 145         final CTFStreamInputReader top = super.getPrio().peek();
 146         if (top != null) {
 147             if (!fCurLocation.equals(fPreviousLocation)) {
 148                 fPreviousLocation = fCurLocation;
 149                 fPreviousEvent = CtfTmfEventFactory.createEvent(top.getCurrentEvent(),
 150                         top.getFilename(), fTrace);
 151             }
 152             return fPreviousEvent;
 153         }
 154         return null;
 155     }
 156
 157     /**
 158      * Return the current timestamp location pointed to by the iterator. This is
 159      * the timestamp for use in CtfLocation, not the event timestamp.
 160      *
 161      * @return long The current timestamp location
 162      */
 163     public synchronized long getCurrentTimestamp() {
 164         final CTFStreamInputReader top = super.getPrio().peek();
 165         if (top != null) {
 166             EventDefinition currentEvent = top.getCurrentEvent();
 167             if (currentEvent != null) {
 168                 long ts = currentEvent.getTimestamp();
 169                 return fTrace.timestampCyclesToNanos(ts);
 170             }
 171         }
 172         return 0;
 173     }
 174
 175     /**
 176      * Seek this iterator to a given location.
 177      *
 178      * @param ctfLocationData
 179      *            The LocationData representing the position to seek to
 180      * @return boolean True if the seek was successful, false if there was an
 181      *         error seeking.
 182      */
 183     public synchronized boolean seek(CtfLocationInfo ctfLocationData) {
 184         boolean ret = false;
 185         if (ctfLocationData.equals(CtfLocation.INVALID_LOCATION)) {
 186             fCurLocation = NULL_LOCATION;
 187             return false;
 188         }
 189
 190         /* Avoid the cost of seeking at the current location. */
 191         if (fCurLocation.getLocationInfo().equals(ctfLocationData)) {
 192             return super.hasMoreEvents();
 193         }
 194         /* Update location to make sure the current event is updated */
 195         fCurLocation = new CtfLocation(ctfLocationData);
 196
 197         /* Adjust the timestamp depending on the trace's offset */
 198         long currTimestamp = ctfLocationData.getTimestamp();
 199         final long offsetTimestamp = this.getCtfTmfTrace().timestampNanoToCycles(currTimestamp);
 200         try {
 201             if (offsetTimestamp < 0) {
 202                 ret = super.seek(0L);
 203             } else {
 204                 ret = super.seek(offsetTimestamp);
 205             }
 206         } catch (CTFException e) {
 207             Activator.getDefault().logError(e.getMessage(), e);
 208             return false;
 209         }
 210         /*
 211          * Check if there is already one or more events for that timestamp, and
 212          * assign the location index correctly
 213          */
 214         long index = 0;
 215         final CtfTmfEvent currentEvent = this.getCurrentEvent();
 216         if (currentEvent != null) {
 217             currTimestamp = currentEvent.getTimestamp().getValue();
 218
 219             for (long i = 0; i < ctfLocationData.getIndex(); i++) {
 220                 if (currTimestamp == currentEvent.getTimestamp().getValue()) {
 221                     index++;
 222                 } else {
 223                     index = 0;
 224                 }
 225                 this.advance();
 226             }
 227         } else {
 228             ret = false;
 229         }
 230         /* Seek the current location accordingly */
 231         if (ret) {
 232             fCurLocation = new CtfLocation(new CtfLocationInfo(getCurrentEvent().getTimestamp().getValue(), index));
 233         } else {
 234             fCurLocation = NULL_LOCATION;
 235         }
 236
 237         return ret;
 238     }
 239
 240     // ------------------------------------------------------------------------
 241     // CTFTraceReader
 242     // ------------------------------------------------------------------------
 243
 244     @Override
 245     public boolean seek(long timestamp) {
 246         return seek(new CtfLocationInfo(timestamp, 0));
 247     }
 248
 249     @Override
 250     public synchronized boolean advance() {
 251         boolean ret = false;
 252         try {
 253             ret = super.advance();
 254         } catch (CTFException e) {
 255             Activator.getDefault().logError(e.getMessage(), e);
 256         }
 257
 258         if (ret) {
 259             long timestamp = fCurLocation.getLocationInfo().getTimestamp();
 260             final long timestampValue = getCurrentTimestamp();
 261             if (timestamp == timestampValue) {
 262                 long index = fCurLocation.getLocationInfo().getIndex();
 263                 fCurLocation = new CtfLocation(timestampValue, index + 1);
 264             } else {
 265                 fCurLocation = new CtfLocation(timestampValue, 0L);
 266             }
 267         } else {
 268             fCurLocation = NULL_LOCATION;
 269         }
 270         return ret;
 271     }
 272
 273     // ------------------------------------------------------------------------
 274     // ITmfContext
 275     // ------------------------------------------------------------------------
 276
 277     @Override
 278     public long getRank() {
 279         return fCurRank;
 280     }
 281
 282     @Override
 283     public void setRank(long rank) {
 284         fCurRank = rank;
 285     }
 286
 287     @Override
 288     public void increaseRank() {
 289         /* Only increase the rank if it's valid */
 290         if (hasValidRank()) {
 291             fCurRank++;
 292         }
 293     }
 294
 295     @Override
 296     public boolean hasValidRank() {
 297         return (getRank() >= 0);
 298     }
 299
 300     @Override
 301     public void setLocation(ITmfLocation location) {
 302         // FIXME alex: isn't there a cleaner way than a cast here?
 303         fCurLocation = (CtfLocation) location;
 304         seek(((CtfLocation) location).getLocationInfo());
 305     }
 306
 307     @Override
 308     public CtfLocation getLocation() {
 309         return fCurLocation;
 310     }
 311
 312     // ------------------------------------------------------------------------
 313     // Comparable
 314     // ------------------------------------------------------------------------
 315
 316     @Override
 317     public int compareTo(final CtfIterator o) {
 318         if (getRank() < o.getRank()) {
 319             return -1;
 320         } else if (getRank() > o.getRank()) {
 321             return 1;
 322         }
 323         return 0;
 324     }
 325
 326     // ------------------------------------------------------------------------
 327     // Object
 328     // ------------------------------------------------------------------------
 329
 330     @Override
 331     public int hashCode() {
 332         final int prime = 31;
 333         int result = super.hashCode();
 334         result = (prime * result)
 335                 + ((fTrace == null) ? 0 : fTrace.hashCode());
 336         result = (prime * result)
 337                 + ((fCurLocation == null) ? 0 : fCurLocation.hashCode());
 338         result = (prime * result) + (int) (fCurRank ^ (fCurRank >>> 32));
 339         return result;
 340     }
 341
 342     @Override
 343     public boolean equals(Object obj) {
 344         if (this == obj) {
 345             return true;
 346         }
 347         if (!super.equals(obj)) {
 348             return false;
 349         }
 350         if (!(obj instanceof CtfIterator)) {
 351             return false;
 352         }
 353         CtfIterator other = (CtfIterator) obj;
 354         if (!equalsNullable(fTrace, other.fTrace)) {
 355             return false;
 356         }
 357         if (!equalsNullable(fCurLocation, other.fCurLocation)) {
 358             return false;
 359         }
 360         if (fCurRank != other.fCurRank) {
 361             return false;
 362         }
 363         return true;
 364     }
 365 }