bundles/org.simantics.acorn/src/org/simantics/acorn/MainProgram.java

   1 package org.simantics.acorn;
   2
   3 import java.io.Closeable;
   4 import java.io.IOException;
   5 import java.util.ArrayList;
   6 import java.util.Comparator;
   7 import java.util.List;
   8 import java.util.Map;
   9 import java.util.TreeMap;
  10 import java.util.concurrent.Callable;
  11 import java.util.concurrent.ExecutorService;
  12 import java.util.concurrent.Executors;
  13 import java.util.concurrent.Semaphore;
  14 import java.util.concurrent.ThreadFactory;
  15 import java.util.concurrent.TimeUnit;
  16
  17 import org.simantics.acorn.exception.AcornAccessVerificationException;
  18 import org.simantics.acorn.exception.IllegalAcornStateException;
  19 import org.simantics.acorn.lru.ClusterStreamChunk;
  20 import org.simantics.acorn.lru.ClusterUpdateOperation;
  21 import org.simantics.db.service.ClusterUID;
  22 import org.simantics.utils.logging.TimeLogger;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 public class MainProgram implements Runnable, Closeable {
  27
  28         private static final Logger LOGGER = LoggerFactory.getLogger(MainProgram.class);
  29
  30         private static final int CLUSTER_THREADS = 4;
  31         private static final int CHUNK_CACHE_SIZE = 100;
  32
  33         private final GraphClientImpl2 client;
  34         private final ExecutorService[] clusterUpdateThreads;
  35     private final List<ClusterUpdateOperation>[] updateSchedules;
  36
  37         private Thread mainProgramThread;
  38
  39         private boolean alive = true;
  40         private Semaphore deathBarrier = new Semaphore(0);
  41
  42         final ClusterManager clusters;
  43
  44         private final OperationQueue operationQueue = new OperationQueue(this);
  45
  46         static class ClusterThreadFactory implements ThreadFactory {
  47
  48                 final String name;
  49                 final boolean daemon;
  50
  51                 public ClusterThreadFactory(String name, boolean daemon) {
  52                         this.name = name;
  53                         this.daemon = daemon;
  54                 }
  55
  56                 @Override
  57                 public Thread newThread(Runnable r) {
  58                         Thread thread = new Thread(r, name);
  59                         thread.setDaemon(daemon);
  60                         return thread;
  61                 }
  62         }
  63
  64         @SuppressWarnings("unchecked")
  65         MainProgram(GraphClientImpl2 client, ClusterManager clusters) {
  66
  67                 this.client = client;
  68                 this.clusters = clusters;
  69                 this.clusterUpdateThreads = new ExecutorService[CLUSTER_THREADS];
  70                 this.updateSchedules = new ArrayList[CLUSTER_THREADS];
  71                 for(int i=0;i<clusterUpdateThreads.length;i++) {
  72                         clusterUpdateThreads[i] = Executors.newSingleThreadExecutor(new ClusterThreadFactory("Cluster Updater " + (i+1), false));
  73                         updateSchedules[i] = new ArrayList<ClusterUpdateOperation>();
  74                 }
  75         }
  76
  77         void startTransaction(long id) {
  78                 operationQueue.startTransaction(id);
  79         }
  80
  81         private static Comparator<ClusterUID> clusterComparator = new Comparator<ClusterUID>() {
  82
  83                 @Override
  84                 public int compare(ClusterUID o1, ClusterUID o2) {
  85                         return Long.compare(o1.second, o2.second);
  86                 }
  87         };
  88
  89         @Override
  90         public void run() {
  91
  92                 mainProgramThread = Thread.currentThread();
  93
  94                 try {
  95
  96                         main:
  97                         while(alive) {
  98
  99                                 TreeMap<ClusterUID, List<ClusterUpdateOperation>> updates = new TreeMap<ClusterUID, List<ClusterUpdateOperation>>(clusterComparator);
 100
 101                                 operationQueue.pumpUpdates(updates);
 102
 103                                 if(updates.isEmpty()) {
 104
 105                                         long duration = operationQueue.waitFor();
 106
 107                                         if (!alive)
 108                                                 break main;
 109
 110                                         if(duration > 4000000000L) {
 111                                                 checkIdle();
 112                                         }
 113
 114                                 }
 115
 116 //                              long sss = System.nanoTime();
 117
 118                                 runUpdates(updates);
 119                                 runTasksIfEmpty();
 120
 121                                 /*
 122                                  * Here we are actively processing updates from client.
 123                                  * Maintain necessary caching here.
 124                                  */
 125
 126                                 clusters.streamLRU.acquireMutex();
 127                                 try {
 128                                         swapChunks();
 129                                 } catch (AcornAccessVerificationException | IllegalAcornStateException e) {
 130                                         LOGGER.error("cluster chunk swapping failed", e);
 131                                 } finally {
 132                                         clusters.streamLRU.releaseMutex();
 133                                 }
 134                                 clusters.csLRU.acquireMutex();
 135                                 try {
 136                                         swapCS();
 137                                 } catch (Throwable t) {
 138                                         throw new IllegalAcornStateException(t);
 139                                 } finally {
 140                                         clusters.csLRU.releaseMutex();
 141                                 }
 142
 143                                 TimeLogger.log("Performed updates");
 144
 145                         }
 146
 147                 } catch (Throwable t) {
 148                         LOGGER.error("FATAL: MainProgram died unexpectedly", t);
 149                 } finally {
 150                         deathBarrier.release();
 151                 }
 152         }
 153
 154         @FunctionalInterface
 155         static interface MainProgramRunnable {
 156                 void run() throws Exception;
 157                 default void error(Exception e) {
 158                         LOGGER.error("An error occured", e);
 159                 }
 160                 default void success() {}
 161         }
 162
 163         private void runUpdates(TreeMap<ClusterUID, List<ClusterUpdateOperation>> updates) throws InterruptedException {
 164
 165                 for(int i=0;i<CLUSTER_THREADS;i++)
 166                         updateSchedules[i].clear();
 167
 168                 final Semaphore s = new Semaphore(0);
 169
 170                 for(Map.Entry<ClusterUID, List<ClusterUpdateOperation>> entry : updates.entrySet()) {
 171                         ClusterUID key = entry.getKey();
 172                         int hash = key.hashCode() & (clusterUpdateThreads.length-1);
 173                         updateSchedules[hash].addAll(entry.getValue());
 174                 }
 175
 176                 //                              final AtomicLong elapsed = new AtomicLong(0);
 177                 int acquireAmount = 0;
 178                 for(int i=0;i<CLUSTER_THREADS;i++) {
 179                         final List<ClusterUpdateOperation> ops = updateSchedules[i];
 180                         if (!ops.isEmpty()) {
 181                                 acquireAmount++;
 182                                 clusterUpdateThreads[i].submit(new Callable<Object>() {
 183
 184                     @Override
 185                     public Object call() throws Exception {
 186                         //long st = System.nanoTime();
 187                         try {
 188                             for(ClusterUpdateOperation op : ops) {
 189                                 op.run();
 190                             }
 191                         } finally {
 192                             s.release();
 193                         }
 194                         return null;
 195
 196 //                          long duration = System.nanoTime()-st;
 197 //                          elapsed.addAndGet(duration);
 198 //                          double dur = 1e-9*duration;
 199 //                          if(dur > 0.05)
 200 //                              System.err.println("duration=" + dur + "s. " + ops.size());
 201                     }
 202                 });
 203                         }
 204                 }
 205
 206                 s.acquire(acquireAmount);
 207
 208         }
 209
 210         /*
 211          * This shall be run when no updates are currently available.
 212          */
 213         private void runTasksIfEmpty() {
 214                 if(operationQueue.isEmpty()) {
 215                         List<MainProgramRunnable> todo = new ArrayList<>();
 216                         operationQueue.pumpTasks(todo);
 217                         for(MainProgramRunnable runnable : todo) {
 218                                 try {
 219                                         runnable.run();
 220                                         runnable.success();
 221                                 } catch (Exception e) {
 222                                         runnable.error(e);
 223                                 }
 224                         }
 225                 }
 226         }
 227
 228         /*
 229          * This gets called when an idle period has been detected
 230          */
 231         private void checkIdle() throws IOException, IllegalAcornStateException, AcornAccessVerificationException {
 232
 233                 // Was this a time-out or a new stream request?
 234                 if(operationQueue.isEmpty()) {
 235
 236                         /*
 237                          * We are idling here.
 238                          * Flush all caches gradually
 239                          */
 240
 241                         // Write pending cs to disk
 242                         boolean written = clusters.csLRU.swapForced();
 243                         while(written) {
 244                                 if(!operationQueue.isEmpty()) break;
 245                                 written = clusters.csLRU.swapForced();
 246                         }
 247                         // Write pending chunks to disk
 248                         written = clusters.streamLRU.swapForced();
 249                         while(written) {
 250                                 if(!operationQueue.isEmpty()) break;
 251                                 written = clusters.streamLRU.swapForced();
 252                         }
 253                         // Write pending files to disk
 254                         written = clusters.fileLRU.swapForced();
 255                         while(written) {
 256                                 if(!operationQueue.isEmpty()) break;
 257                                 written = clusters.fileLRU.swapForced();
 258                         }
 259                         // Write pending clusters to disk
 260                         written = clusters.clusterLRU.swapForced();
 261                         while(written) {
 262                                 if(!operationQueue.isEmpty()) break;
 263                                 written = clusters.clusterLRU.swapForced();
 264                         }
 265
 266                         client.tryMakeSnapshot();
 267
 268                 }
 269
 270         }
 271
 272
 273         /*
 274          * This schedules tasks to be run in MainProgram thread
 275          * Called from other threads than MainProgram thread
 276          *
 277          */
 278         void runIdle(MainProgramRunnable task) {
 279                 operationQueue.scheduleTask(task);
 280         }
 281
 282         /*
 283          * Mutex for streamLRU is assumed here
 284          *
 285          */
 286         private void swapChunks() throws AcornAccessVerificationException, IllegalAcornStateException {
 287
 288                 // Cache chunks during update operations
 289                 while(clusters.streamLRU.swap(Long.MAX_VALUE, CHUNK_CACHE_SIZE));
 290         }
 291
 292         private void swapCS() throws AcornAccessVerificationException, IllegalAcornStateException {
 293
 294                 // Cache chunks during update operations
 295                 while(clusters.csLRU.swap(Long.MAX_VALUE, CHUNK_CACHE_SIZE));
 296         }
 297
 298         /*
 299          * Called by DB client write threads
 300          */
 301         void committed() {
 302
 303                 ClusterStreamChunk last = operationQueue.commitLast();
 304         if (!alive) {
 305             LOGGER.error("Trying to commit operation after MainProgram is closed! Operation is " + last);
 306         }
 307
 308         }
 309
 310         /*
 311          * Called by DB client write threads
 312          */
 313         void schedule(ClusterUpdateOperation operation) throws IllegalAcornStateException {
 314
 315                 if (!alive) {
 316                 LOGGER.error("Trying to schedule operation after MainProgram is closed! Operation is " + operation);
 317             }
 318
 319                 clusters.streamLRU.acquireMutex();
 320
 321                 try {
 322
 323                         operationQueue.scheduleUpdate(operation);
 324                         swapChunks();
 325
 326                 } catch (IllegalAcornStateException e) {
 327                     throw e;
 328                 } catch (Throwable t) {
 329                         throw new IllegalAcornStateException(t);
 330                 } finally {
 331                         clusters.streamLRU.releaseMutex();
 332                 }
 333
 334         }
 335
 336     @Override
 337     public void close() {
 338
 339         alive = false;
 340
 341         // This will wake up the sleeping beauty
 342         operationQueue.scheduleTask(() -> {});
 343
 344         try {
 345             deathBarrier.acquire();
 346         } catch (InterruptedException e) {
 347         }
 348
 349         for (ExecutorService executor : clusterUpdateThreads)
 350             executor.shutdown();
 351
 352         for (int i = 0; i < clusterUpdateThreads.length; i++) {
 353             try {
 354                 ExecutorService executor  = clusterUpdateThreads[i];
 355                 executor.awaitTermination(500, TimeUnit.MILLISECONDS);
 356                 clusterUpdateThreads[i] = null;
 357             } catch (InterruptedException e) {
 358                 LOGGER.error("clusterUpdateThread[{}] termination interrupted", i, e);
 359             }
 360         }
 361     }
 362
 363     void assertMainProgramThread() {
 364         assert(Thread.currentThread().equals(mainProgramThread));
 365     }
 366
 367     void assertNoMainProgramThread() {
 368         assert(!Thread.currentThread().equals(mainProgramThread));
 369     }
 370
 371 }