Programming Languages Research Group: Git - IRC.git/blob

   1 /*
   2  * Copyright (c) 2007, Solido Systems
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *
   8  * Redistributions of source code must retain the above copyright notice, this
   9  * list of conditions and the following disclaimer.
  10  *
  11  * Redistributions in binary form must reproduce the above copyright notice,
  12  * this list of conditions and the following disclaimer in the documentation
  13  * and/or other materials provided with the distribution.
  14  *
  15  * Neither the name of Solido Systems nor the names of its contributors may be
  16  * used to endorse or promote products derived from this software without
  17  * specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  23  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 package com.solidosystems.tuplesoup.core;
  33
  34
  35 import TransactionalIO.core.TransactionalFile;
  36 import java.io.*;
  37 import java.util.*;
  38 import java.nio.channels.*;
  39 import com.solidosystems.tuplesoup.filter.*;
  40 import dstm2.atomic;
  41 import dstm2.Thread;
  42 import dstm2.util.StringKeyHashMap;
  43 import java.util.concurrent.Callable;
  44
  45 /**
  46  * The table stores a group of rows.
  47  * Every row must have a unique id within a table.
  48  */
  49 public class DualFileTableTransactional implements TableTransactional{
  50
  51
  52     private int INDEXCACHESIZE=8192;
  53
  54     private String filealock="filea-dummy";
  55     private String fileblock="fileb-dummy";
  56
  57 //    private DataOutputStream fileastream=null;
  58 //    private DataOutputStream filebstream=null;
  59     private TransactionalFile fileastream=null;
  60     private TransactionalFile filebstream=null;
  61 //    private RandomAccessFile filearandom=null;
  62     private TransactionalFile filearandom=null;
  63     private TransactionalFile filebrandom=null;
  64 //   FileChannel fca=null;
  65 //   FileChannel fcb=null;
  66     private TableIndexTransactional index=null;
  67
  68 //    private long fileaposition=0;
  69  //   private long filebposition=0;
  70
  71     private boolean rowswitch=true;
  72
  73     private String title;
  74     private String location;
  75
  76     private TableIndexNodeTransactional indexcachefirst;
  77     private TableIndexNodeTransactional indexcachelast;
  78     //private int indexcacheusage;
  79
  80     private StringKeyHashMap<TableIndexNodeTransactional> indexcache;
  81     //private Hashtable<String,TableIndexNode> indexcache;
  82
  83
  84     DualFileTableTSInf atomicfields;
  85     // Statistic counters
  86     public @atomic interface DualFileTableTSInf{
  87         long getstat_add();
  88         long getstat_update();
  89         long getstat_delete();
  90         long getstat_add_size();
  91         long getstat_update_size();
  92         long getstat_read_size();
  93         long getstat_read();
  94         long getstat_cache_hit();
  95         long getstat_cache_miss();
  96         long getstat_cache_drop();
  97         long getFileaposition();
  98         long getFilebposition();
  99         int getIndexcacheusage();
 100
 101         void setstat_add(long val);
 102         void setstat_update(long val);
 103         void setstat_delete(long val);
 104         void setstat_add_size(long val);
 105         void setstat_update_size(long val);
 106         void setstat_read_size(long val);
 107         void setstat_read(long val);
 108         void setstat_cache_hit(long val);
 109         void setstat_cache_miss(long val);
 110         void setstat_cache_drop(long val);
 111         void setIndexcacheusage(int val);
 112         void setFileaposition(long val);
 113         void setFilebposition(long val);
 114     }
 115
 116     /*long stat_add=0;
 117     long stat_update=0;
 118     long stat_delete=0;
 119     long stat_add_size=0;
 120     long stat_update_size=0;
 121     long stat_read_size=0;
 122     long stat_read=0;
 123     long stat_cache_hit=0;
 124     long stat_cache_miss=0;
 125     long stat_cache_drop=0;*/
 126
 127     protected String statlock="stat-dummy";
 128
 129     /**
 130      * Return the current values of the statistic counters and reset them.
 131      * The current counters are:
 132      * <ul>
 133      *   <li>stat_table_add
 134      *   <li>stat_table_update
 135      *   <li>stat_table_delete
 136      *   <li>stat_table_add_size
 137      *   <li>stat_table_update_size
 138      *   <li>stat_table_read_size
 139      *   <li>stat_table_read
 140      *   <li>stat_table_cache_hit
 141      *   <li>stat_table_cache_miss
 142      *   <li>stat_table_cache_drop
 143      * </ul>
 144      * Furthermore, the index will be asked to deliver separate index specific counters
 145      */
 146     public Hashtable<String,Long> readStatistics(){
 147         Hashtable<String,Long> hash=new Hashtable<String,Long>();
 148         synchronized(statlock){
 149             hash.put("stat_table_add",atomicfields.getstat_add());
 150             hash.put("stat_table_update",atomicfields.getstat_update());
 151             hash.put("stat_table_delete",atomicfields.getstat_delete());
 152             hash.put("stat_table_add_size",atomicfields.getstat_add_size());
 153             hash.put("stat_table_update_size",atomicfields.getstat_update_size());
 154             hash.put("stat_table_read_size",atomicfields.getstat_read_size());
 155             hash.put("stat_table_read",atomicfields.getstat_read());
 156             hash.put("stat_table_cache_hit",atomicfields.getstat_cache_hit());
 157             hash.put("stat_table_cache_miss",atomicfields.getstat_cache_miss());
 158             hash.put("stat_table_cache_drop",atomicfields.getstat_cache_drop());
 159             atomicfields.setstat_add(0);
 160             atomicfields.setstat_update(0);
 161             atomicfields.setstat_delete(0);
 162             atomicfields.setstat_add_size(0);
 163             atomicfields.setstat_update_size(0);
 164             atomicfields.setstat_read_size(0);
 165             atomicfields.setstat_read(0);
 166             atomicfields.setstat_cache_hit(0);
 167             atomicfields.setstat_cache_miss(0);
 168             atomicfields.setstat_cache_drop(0);
 169             Hashtable<String,Long> ihash=index.readStatistics();
 170             hash.putAll(ihash);
 171         }
 172         return hash;
 173     }
 174
 175     /**
 176      * Create a new table object with the default flat index model
 177      */
 178
 179
 180     /**
 181      * Create a new table object with a specific index model
 182      */
 183     public DualFileTableTransactional(String title,String location, int indextype) throws IOException{
 184         this.title=title;
 185         this.location=location;
 186         if(!this.location.endsWith(File.separator))this.location+=File.separator;
 187         switch(indextype){
 188              case PAGED  : index=new PagedIndexTransactional(getFileName(INDEX));
 189                 break;
 190
 191         }
 192         indexcachefirst=null;
 193         indexcachelast=null;
 194         atomicfields.setFileaposition(0);
 195         atomicfields.setFilebposition(0);
 196         atomicfields.setIndexcacheusage(0);
 197         indexcache=new StringKeyHashMap<TableIndexNodeTransactional>();
 198     }
 199
 200     /**
 201      * Set the maximal allowable size of the index cache.
 202      */
 203     public void setIndexCacheSize(int newsize){
 204         INDEXCACHESIZE=newsize;
 205     }
 206
 207     /**
 208      * Close all open file streams
 209      */
 210     public void close(){
 211         try{
 212             if(fileastream!=null)fileastream.close();
 213             if(filebstream!=null)filebstream.close();
 214             if(filearandom!=null)filearandom.close();
 215             if(filebrandom!=null)filebrandom.close();
 216             index.close();
 217         }catch(Exception e){}
 218     }
 219
 220     /**
 221      * Returns the name of this table
 222      */
 223     public String getTitle(){
 224          return title;
 225     }
 226
 227     /**
 228      * Returns the location of this tables datafiles
 229      */
 230     public String getLocation(){
 231          return location;
 232     }
 233
 234     protected String getFileName(int type){
 235          switch(type){
 236              case FILEB  :   return location+title+".a";
 237              case FILEA  :   return location+title+".b";
 238              case INDEX  :   return location+title+".index";
 239          }
 240          return null;
 241     }
 242
 243     /**
 244      * Delete the files created by this table object.
 245      * Be aware that this will delete any data stored in this table!
 246      */
 247     public void deleteFiles(){
 248          try{
 249              File ftest=new File(getFileName(FILEA));
 250              ftest.delete();
 251          }catch(Exception e){}
 252          try{
 253              File ftest=new File(getFileName(FILEB));
 254              ftest.delete();
 255          }catch(Exception e){}
 256          try{
 257              File ftest=new File(getFileName(INDEX));
 258              ftest.delete();
 259          }catch(Exception e){}
 260     }
 261
 262      private synchronized void openFile(int type) throws IOException{
 263          switch(type){
 264              case FILEA  : if(fileastream==null){
 265                                // fileastream=new DataOutputStream(new BufferedOutputStream(new FileOutputStream(getFileName(FILEA),true)));
 266                                 fileastream=new TransactionalFile(getFileName(FILEA),"rw");
 267
 268                                 //File ftest=new File(getFileName(FILEA));
 269                                 //atomicfields.setFileaposition(ftest.length());
 270                                 atomicfields.setFileaposition(fileastream.length());
 271                                 fileastream.seek(fileastream.length());
 272                            }
 273                           break;
 274              case FILEB  : if(filebstream==null){
 275                                 filebstream=new TransactionalFile(getFileName(FILEB),"rw");
 276                                 //File ftest=new File(getFileName(FILEB));
 277                                 //atomicfields.setFilebposition(ftest.length());
 278                                 atomicfields.setFilebposition(filebstream.length());
 279                                 filebstream.seek(filebstream.length());
 280                            }
 281                           break;
 282          }
 283      }
 284
 285     /**
 286      * Adds a row of data to this table.
 287      */
 288     public void addRow(RowTransactional row) throws IOException{
 289         // Distribute new rows between the two datafiles by using the rowswitch, but don't spend time synchronizing... this does not need to be acurate!
 290         if(rowswitch){
 291             addRowA(row);
 292         }else{
 293             addRowB(row);
 294         }
 295         rowswitch=!rowswitch;
 296     }
 297
 298      private void addCacheEntry(TableIndexEntryTransactional entry){
 299          synchronized(indexcache){
 300              if(atomicfields.getIndexcacheusage()>INDEXCACHESIZE){
 301                  // remove first entry
 302                  TableIndexNodeTransactional node=indexcachefirst;
 303                  indexcache.remove(node.getData().getId());
 304                  atomicfields.setIndexcacheusage(atomicfields.getIndexcacheusage()-1);
 305                  synchronized(statlock){
 306                      atomicfields.setstat_cache_drop(atomicfields.getstat_cache_drop()+1);
 307                  }
 308                  indexcachefirst=node.getNext();
 309                  if(indexcachefirst==null){
 310                     indexcachelast=null;
 311                  }else{
 312                     indexcachefirst.setPrevious(null);
 313                  }
 314              }
 315              TableIndexNodeTransactional node=new TableIndexNodeTransactional(indexcachelast,entry);
 316              if(indexcachelast!=null){
 317                  indexcachelast.setNext(node);
 318              }
 319              if(indexcachefirst==null){
 320                  indexcachefirst=node;
 321              }
 322              indexcachelast=node;
 323              indexcache.put(entry.getId(),node);
 324              atomicfields.setIndexcacheusage(atomicfields.getIndexcacheusage()+1);
 325         }
 326      }
 327
 328      private void addRowA(RowTransactional row) throws IOException{
 329          //synchronized(filealock){
 330          final Vector args = new Vector();
 331          args.add(row);
 332          Thread.doIt(new Callable<Boolean>() {
 333              public Boolean call() throws Exception{
 334                  openFile(FILEA);
 335              //int pre=fileastream.size();
 336                  int pre= (int)fileastream.getFilePointer();
 337              //row.writeToStream(fileastream);
 338                  ((RowTransactional)args.get(0)).writeToFile(fileastream);
 339              //int post= fileastream.size();
 340                  int post= (int)fileastream.getFilePointer();
 341              //fileastream.flush();
 342
 343              //synchronized(statlock){
 344                  atomicfields.setstat_add(atomicfields.getstat_add()+1);
 345                  atomicfields.setstat_add_size(atomicfields.getstat_add_size()+((RowTransactional)args.get(0)).getSize());
 346              //}
 347
 348                 index.addEntry(((RowTransactional)args.get(0)).getId(),((RowTransactional)args.get(0)).getSize(),FILEA,atomicfields.getFilebposition());
 349                 if(INDEXCACHESIZE>0){
 350                     TableIndexEntryTransactional entry=new TableIndexEntryTransactional(((RowTransactional)args.get(0)).getId(),((RowTransactional)args.get(0)).getSize(),FILEA,atomicfields.getFileaposition());
 351                     addCacheEntry(entry);
 352                 }
 353                 atomicfields.setFileaposition(atomicfields.getFileaposition()+Row.calcSize(pre,post));
 354             }
 355          });
 356      }
 357      private void addRowB(RowTransactional row) throws IOException{
 358         // synchronized(fileblock){
 359          final Vector args = new Vector();
 360          args.add(row);
 361          Thread.doIt(new Callable<Boolean>() {
 362              public Boolean call() throws Exception{
 363                 openFile(FILEB);
 364              //int pre=filebstream.size();
 365                 int pre= (int)filebstream.getFilePointer();
 366              //row.writeToStream(filebstream);
 367                 ((RowTransactional)args.get(0)).writeToFile(filebstream);
 368                 int post=(int)filebstream.getFilePointer();
 369              //int post=filebstream.size();
 370              //filebstream.flush();
 371              //synchronized(statlock){
 372                 atomicfields.setstat_add(atomicfields.getstat_add()+1);
 373                 atomicfields.setstat_add_size(atomicfields.getstat_add_size()+((RowTransactional)args.get(0)).getSize());
 374              // }
 375                 index.addEntry(((RowTransactional)args.get(0)).getId(),((RowTransactional)args.get(0)).getSize(),FILEB,atomicfields.getFilebposition());
 376                 if(INDEXCACHESIZE>0){
 377                   TableIndexEntryTransactional entry=new TableIndexEntryTransactional(((RowTransactional)args.get(0)).getId(),((RowTransactional)args.get(0)).getSize(),FILEB,atomicfields.getFilebposition());
 378                   addCacheEntry(entry);
 379                 }
 380                 atomicfields.setFilebposition(atomicfields.getFilebposition()+Row.calcSize(pre,post));
 381             }
 382          });
 383      }
 384
 385
 386      private void updateCacheEntry(TableIndexEntryTransactional entry){
 387           final Vector args = new Vector();
 388           args.add(entry);
 389           Thread.doIt(new Callable<Boolean>() {
 390              public Boolean call() throws Exception{
 391           //synchronized(indexcache){
 392               if(indexcache.containsKey(((TableIndexEntryTransactional)(args.get(0))).getId())){
 393                   TableIndexNodeTransactional node=indexcache.get(((TableIndexEntryTransactional)(args.get(0))).getId());
 394                   node.setData(((TableIndexEntryTransactional)(args.get(0))));
 395                   if(node!=indexcachelast){
 396                       if(node==indexcachefirst){
 397                           indexcachefirst=node.getNext();
 398                       }
 399                       node.remove();
 400                       indexcachelast.setNext(node);
 401                       node.setPrevious(indexcachelast);
 402                       node.setNext(null);
 403                       indexcachelast=node;
 404                   }
 405               }else{
 406                   addCacheEntry(((TableIndexEntryTransactional)(args.get(0))));
 407               }
 408             }
 409         });
 410       }
 411
 412       private void removeCacheEntry(String id){
 413           //synchronized(indexcache){
 414           final Vector args = new Vector();
 415           args.add(id);
 416           Thread.doIt(new Callable<Boolean>() {
 417              public Boolean call() throws Exception{
 418
 419                 if(indexcache.containsKey((String)(args.get(0)))){
 420                     TableIndexNodeTransactional node=indexcache.get((String)(args.get(0)));
 421                     indexcache.remove((String)(args.get(0)));
 422                     if(atomicfields.getIndexcacheusage()==1){
 423                         indexcachefirst=null;
 424                         indexcachelast=null;
 425                         atomicfields.setIndexcacheusage(0);
 426                         return true;
 427                     }
 428                     if(node==indexcachefirst){
 429                         indexcachefirst=node.getNext();
 430                         indexcachefirst.setPrevious(null);
 431                     }else if(node==indexcachelast){
 432                         indexcachelast=node.getPrevious();
 433                         indexcachelast.setNext(null);
 434                     }else{
 435                         node.remove();
 436                     }
 437                     atomicfields.setIndexcacheusage(atomicfields.getIndexcacheusage()-1);
 438               //      synchronized(statlock){
 439                      atomicfields.setstat_cache_drop(atomicfields.getstat_cache_drop()+1);
 440
 441               //      }
 442                 }
 443                 return true;
 444             }
 445           });
 446       }
 447
 448       private TableIndexEntryTransactional getCacheEntry(String id){
 449           final Vector args = new Vector();
 450           args.add(id);
 451
 452           TableIndexEntryTransactional res = Thread.doIt(new Callable<TableIndexEntryTransactional>() {
 453              public TableIndexEntryTransactional call() throws Exception{
 454           //synchronized(indexcache){
 455               if(indexcache.containsKey((String)(args.get(0)))){
 456                   TableIndexNodeTransactional node=indexcache.get((String)(args.get(0)));
 457                   if(node!=indexcachelast){
 458                       if(node==indexcachefirst){
 459                             indexcachefirst=node.getNext();
 460                         }
 461                         node.remove();
 462                         indexcachelast.setNext(node);
 463                         node.setPrevious(indexcachelast);
 464                         node.setNext(null);
 465                         indexcachelast=node;
 466                   }
 467                 //  synchronized(statlock){
 468                        atomicfields.setstat_cache_hit(atomicfields.getstat_cache_hit()+1);
 469                 //   }
 470                   return node.getData();
 471               }
 472               return null;
 473              }
 474           });
 475           if (res != null)
 476               return res;
 477
 478           Thread.doIt(new Callable<Boolean>() {
 479              public Boolean call() throws Exception{
 480           //synchronized(statlock){
 481                atomicfields.setstat_cache_miss(atomicfields.getstat_cache_miss()+1);
 482                return true;
 483              }
 484           });
 485            //}
 486           return null;
 487       }
 488
 489      /**
 490       * Adds a row to this table if it doesn't already exist, if it does it updates the row instead.
 491       * This method is much slower than directly using add or update, so only use it if you don't know wether or not the row already exists.
 492       */
 493      public void addOrUpdateRow(RowTransactional row) throws IOException{
 494          RowTransactional tmprow=getRow(row.getId());
 495          if(tmprow==null){
 496              addRow(row);
 497          }else{
 498              updateRow(row);
 499          }
 500      }
 501
 502      /**
 503       * Updates a row stored in this table.
 504       */
 505      public void updateRow(RowTransactional row) throws IOException{
 506          TableIndexEntryTransactional entry=null;
 507          final Vector args = new Vector();
 508          args.add(row);
 509          args.add(entry);
 510          // Handle index entry caching
 511          if(INDEXCACHESIZE>0){
 512              Thread.doIt(new Callable<Boolean>() {
 513                 public Boolean call() throws Exception {
 514                     TableIndexEntryTransactional entry = (TableIndexEntryTransactional) (args.get(1));
 515                     RowTransactional row = (RowTransactional) (args.get(0));
 516                     entry = getCacheEntry(row.getId());
 517                     if(entry==null){
 518                        entry=index.scanIndex(row.getId());
 519                        addCacheEntry(entry);
 520                     }
 521                     return true;
 522                 }
 523              });
 524           /*   synchronized(indexcache){
 525                  entry=getCacheEntry(row.getId());
 526                  if(entry==null){
 527                      entry=index.scanIndex(row.getId());
 528                      addCacheEntry(entry);
 529                  }
 530              }*/
 531          }else{
 532              entry=index.scanIndex(row.getId());
 533          }
 534          if(entry.getRowSize()>=row.getSize()){
 535             // Add to the existing location
 536             switch(entry.getLocation()){
 537                 case FILEA  :
 538                //     synchronized(filealock){
 539                      Thread.doIt(new Callable<Boolean>() {
 540                         public Boolean call() throws Exception {
 541                             if(filearandom==null){
 542                                 filearandom=new TransactionalFile(getFileName(FILEA),"rw");
 543                                // fca=filearandom.getChannel();
 544                             }
 545                             filearandom.seek(((TableIndexEntryTransactional) (args.get(1))).getPosition());
 546                             ((RowTransactional) (args.get(0))).writeToFile(filearandom);
 547                             return true;
 548                             //fca.force(false);
 549                         }
 550                      });
 551                //   }
 552                     break;
 553                 case FILEB :
 554               //      synchronized(fileblock){
 555                     Thread.doIt(new Callable<Boolean>() {
 556                         public Boolean call() throws Exception {
 557                                 if(filebrandom==null){
 558                                     filebrandom=new TransactionalFile(getFileName(FILEB),"rw");
 559                                   //  fcb=filebrandom.getChannel();
 560                                 }
 561                                 filebrandom.seek(((TableIndexEntryTransactional) (args.get(1))).getPosition());
 562                                 ((RowTransactional) (args.get(0))).writeToFile(filebrandom);
 563                                 return true;
 564                                 //fcb.force(false);
 565                         }
 566                     });
 567                     break;
 568             }
 569          }else{
 570              if(rowswitch){
 571                   updateRowA(row);
 572               }else{
 573                   updateRowB(row);
 574               }
 575               rowswitch=!rowswitch;
 576          }
 577          //synchronized(statlock){
 578          Thread.doIt(new Callable<Boolean>() {
 579               public Boolean call() throws Exception{
 580                 atomicfields.setstat_update(atomicfields.getstat_update()+1);
 581                 atomicfields.setstat_update_size(atomicfields.getstat_update_size()+((RowTransactional) (args.get(0))).getSize());
 582                 return true;
 583               }
 584          });
 585      }
 586
 587      private void updateRowA(RowTransactional row) throws IOException{
 588          final Vector args = new Vector();
 589          args.add(row);
 590          Thread.doIt(new Callable<Boolean>() {
 591               public Boolean call() throws Exception{
 592          //synchronized(filealock){
 593                   openFile(FILEA);
 594                   //int pre=filebstream.size();
 595                   int pre=(int)fileastream.getFilePointer();
 596                   //row.writeToStream(filebstream);
 597                   ((RowTransactional)(args.get(0))).writeToFile(fileastream);
 598                   //int post=filebstream.size();
 599                   int post=(int)fileastream.getFilePointer();
 600                   //fileastream.flush();
 601                   index.updateEntry(((RowTransactional)(args.get(0))).getId(),((RowTransactional)(args.get(0))).getSize(),FILEA,atomicfields.getFileaposition());
 602
 603                   // Handle index entry caching
 604                   if(INDEXCACHESIZE>0){
 605                       updateCacheEntry(new TableIndexEntryTransactional(((RowTransactional)(args.get(0))).getId(),((RowTransactional)(args.get(0))).getSize(),FILEA,atomicfields.getFileaposition()));
 606                   }
 607                   atomicfields.setFileaposition(atomicfields.getFilebposition()+RowTransactional.calcSize(pre,post));
 608               }
 609           });
 610      }
 611
 612      private void updateRowB(RowTransactional row) throws IOException{
 613          final Vector args = new Vector();
 614          args.add(row);
 615          Thread.doIt(new Callable<Boolean>() {
 616              public Boolean call() throws Exception{
 617
 618          //synchronized(fileblock){
 619                 openFile(FILEB);
 620               //int pre=filebstream.size();
 621                 int pre=(int)filebstream.getFilePointer();
 622               //row.writeToStream(filebstream);
 623                 ((RowTransactional)(args.get(0))).writeToFile(filebstream);
 624               //int post=filebstream.size();
 625                 int post=(int)filebstream.getFilePointer();
 626               //filebstream.flush();
 627                 index.updateEntry(((RowTransactional)(args.get(0))).getId(),((RowTransactional)(args.get(0))).getSize(),FILEB,atomicfields.getFilebposition());
 628               // Handle index entry caching
 629               // Handle index entry caching
 630                 if(INDEXCACHESIZE>0){
 631                     updateCacheEntry(new TableIndexEntryTransactional(((RowTransactional)(args.get(0))).getId(),((RowTransactional)(args.get(0))).getSize(),FILEB,atomicfields.getFilebposition()));
 632                 }
 633                 atomicfields.setFilebposition(atomicfields.getFilebposition()+RowTransactional.calcSize(pre,post));
 634                 return true;
 635             }
 636         });
 637      }
 638
 639      /**
 640       * Marks a row as deleted in the index.
 641       * Be aware that the space consumed by the row is not actually reclaimed.
 642       */
 643      public void deleteRow(RowTransactional row) throws IOException{
 644           // Handle index entry caching
 645           if(INDEXCACHESIZE>0){
 646               removeCacheEntry(row.getId());
 647           }
 648           index.updateEntry(row.getId(),row.getSize(),DELETE,0);
 649           Thread.doIt(new Callable<Boolean>() {
 650              public Boolean call() throws Exception{
 651           //synchronized(statlock){
 652                 atomicfields.setstat_delete(atomicfields.getstat_delete()+1);
 653                 return true;
 654              }
 655           });
 656          // }
 657      }
 658
 659      /**
 660       * Returns a tuplestream containing the given list of rows
 661       */
 662      public TupleStreamTransactional getRows(List<String> rows) throws IOException{
 663          return new IndexedTableReaderTransactional(this,index.scanIndex(rows));
 664      }
 665
 666      /**
 667       * Returns a tuplestream containing the rows matching the given rowmatcher
 668       */
 669      public TupleStreamTransactional getRows(RowMatcherTransactional matcher) throws IOException{
 670          return new IndexedTableReaderTransactional(this,index.scanIndex(),matcher);
 671      }
 672
 673      /**
 674       * Returns a tuplestream containing those rows in the given list that matches the given RowMatcher
 675       */
 676      public TupleStreamTransactional getRows(List<String> rows,RowMatcherTransactional matcher) throws IOException{
 677           return new IndexedTableReaderTransactional(this,index.scanIndex(rows),matcher);
 678       }
 679
 680      /**
 681       * Returns a tuplestream of all rows in this table.
 682       */
 683      public TupleStreamTransactional getRows() throws IOException{
 684          // return new TableReader(this);
 685          return new IndexedTableReaderTransactional(this,index.scanIndex());
 686      }
 687
 688      /**
 689       * Returns a single row stored in this table.
 690       * If the row does not exist in the table, null will be returned.
 691       */
 692      public RowTransactional getRow(String id) throws IOException{
 693          TableIndexEntryTransactional entry=null;
 694           // Handle index entry caching
 695           if(INDEXCACHESIZE>0){
 696               synchronized(indexcache){
 697                   entry=getCacheEntry(id);
 698                    if(entry==null){
 699                        entry=index.scanIndex(id);
 700                        if(entry!=null){
 701                            addCacheEntry(entry);
 702                        }
 703                    }
 704               }
 705           }else{
 706               entry=index.scanIndex(id);
 707           }
 708           if(entry!=null){
 709               long dataoffset=0;
 710               DataInputStream data=null;
 711               if(entry.getLocation()==Table.FILEA){
 712                   data=new DataInputStream(new BufferedInputStream(new FileInputStream(getFileName(Table.FILEA))));
 713               }else if(entry.getLocation()==Table.FILEB){
 714                   data=new DataInputStream(new BufferedInputStream(new FileInputStream(getFileName(Table.FILEB))));
 715               }
 716               if(data!=null){
 717                   while(dataoffset!=entry.getPosition()){
 718                       dataoffset+=data.skipBytes((int)(entry.getPosition()-dataoffset));
 719                   }
 720                   RowTransactional row=RowTransactional.readFromStream(data);
 721                   data.close();
 722                   final Vector args = new Vector();
 723                   args.add(row);
 724                   Thread.doIt(new Callable<Boolean>() {
 725                       public Boolean call() throws Exception{
 726                   //synchronized(statlock){
 727                           atomicfields.setstat_read(atomicfields.getstat_read()+1);
 728                           atomicfields.setstat_read_size(atomicfields.getstat_read_size()+((RowTransactional)args.get(0)).getSize());
 729                       }
 730                   });
 731                   return row;
 732               }
 733
 734           }
 735           return null;
 736      }
 737  }