1 package org.simantics.db.impl.query;
3 import java.util.ArrayList;
4 import java.util.concurrent.Semaphore;
5 import java.util.concurrent.atomic.AtomicInteger;
7 import org.simantics.db.Session;
8 import org.simantics.db.common.SessionThread;
9 import org.simantics.db.impl.query.QueryProcessor.SessionTask;
10 import org.simantics.db.impl.query.QueryProcessor.ThreadState;
11 import org.slf4j.LoggerFactory;
13 class QueryThread extends Thread implements SessionThread {
15 private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(QueryThread.class);
17 boolean disposed = false;
18 private Semaphore exited = new Semaphore(0);
22 private Session session;
23 private QuerySupport querySupport;
24 private final QueryProcessor processor;
25 private final Semaphore requests;
27 final private ArrayList<SessionTask> tasks = new ArrayList<SessionTask>();
28 // final private ArrayList<SessionTask> own;
29 // final private ArrayList<SessionTask> ownSync;
30 // final private ArrayList<SessionTask> queue;
31 // final private ReentrantLock lock;
32 // final private Condition condition;
33 final private Object querySupportLock;
34 final private int THREADS;
35 final private AtomicInteger sleepers;
36 final private ThreadState[] threadStates;
37 // final private ArrayList<SessionTask>[] delayQueues;
38 // final private QueryThread[] executors;
39 // final private ReentrantLock[] threadLocks;
40 // final private ArrayList<SessionTask>[] queues;
41 // final private ArrayList<SessionTask>[] ownSyncTasks;
43 public QueryThread(Session session, QueryProcessor processor, int index, String name) {
44 super(QueryProcessor.QueryThreadGroup, null, name);
45 this.session = session;
46 this.processor = processor;
48 // own = processor.ownTasks[index];
49 // ownSync = processor.ownSyncTasks[index];
50 // queue = processor.queues[index];
51 // lock = processor.threadLocks[index];
52 // condition = processor.threadConditions[index];
53 querySupportLock = processor.querySupportLock;
54 THREADS = processor.THREADS;
55 sleepers = processor.sleepers;
56 querySupport = processor.querySupport;
57 threadStates = processor.threadStates;
58 requests = processor.requests;
59 // delayQueues = processor.delayQueues;
60 // executors = processor.executors;
61 // threadLocks = processor.threadLocks;
62 // queues = processor.queues;
63 // ownSyncTasks = processor.ownSyncTasks;
66 synchronized void dispose() {
68 // System.err.println("qt dispose");
72 // condition.signalAll();
77 } catch (InterruptedException e) {
78 LOGGER.error("dispose was interrupted", e);
84 // System.err.println("qt disposed");
88 boolean isDisposed() {
94 public Session getSession() {
100 private boolean pumpTask() {
101 // First finish existing executions
102 if(!processor.freeScheduling.isEmpty()) {
103 tasks.add(processor.freeScheduling.removeFirst());
106 // Check for new tasks
107 if(!processor.topLevelTasks.isEmpty()) {
108 tasks.add(processor.topLevelTasks.removeFirst());
114 ArrayList<SessionTask> newTasks(boolean doWait, ArrayList<SessionTask> tasks) {
120 // Return tasks if some were found
121 if(!tasks.isEmpty()) return tasks;
123 if(!doWait) return null;
125 synchronized (querySupportLock) {
132 // We are the last one awake
133 if(sleepers.incrementAndGet() == THREADS) {
135 // Do not indicate sleeping yet
136 sleepers.decrementAndGet();
137 // Ceased can create new own tasks
138 if(querySupport == null) System.err.println("null qs");
139 querySupport.ceased(index);
146 // OK, now we are going to sleep
147 sleepers.incrementAndGet();
153 // Nope nothing. Sleep & wait
154 // Whoever releases this calls sleepers.decrementAndGet()
158 threadStates[index] = ThreadState.DISPOSED;
164 threadStates[index] = ThreadState.SLEEP;
168 sleepers.decrementAndGet();
172 threadStates[index] = ThreadState.DISPOSED;
177 threadStates[index] = ThreadState.RUN;
183 } catch (InterruptedException e) {
185 LOGGER.error("Query handling (newTasks) was interrupted", e);
186 throw new RuntimeException("Querying was interrupted.", e);
192 public boolean runSynchronized() {
194 boolean didExecute = false;
196 // for(int performer=0;performer<THREADS;performer++) {
197 // if(!delayQueues[index * THREADS + performer].isEmpty()) {
198 // synchronized(executors[performer]) {
199 // threadLocks[performer].lock();
200 // queues[performer].addAll(delayQueues[index * THREADS + performer]);
201 // delayQueues[index * THREADS + performer].clear();
202 // executors[performer].notify();
203 // threadLocks[performer].unlock();
208 if(tasks.isEmpty()) {
209 ArrayList<SessionTask> finished = newTasks(false, tasks);
210 if(finished == null) return didExecute;
213 while(!tasks.isEmpty()) {
215 SessionTask task = tasks.remove(tasks.size() - 1);
217 // if(task.syncCaller == index) {
218 // ownSyncTasks[index].add(task);
221 // System.err.println("QT(s) " + index + " runs " + task);
234 QuerySupport support = this.querySupport;
240 boolean finished = newTasks(true, tasks) == null;
245 while(!tasks.isEmpty()) {
247 SessionTask task = tasks.remove(tasks.size()-1);
254 } catch (Throwable t) {
256 LOGGER.error("FATAL BUG: QueryThread task processing caused unexpected exception.", t);