1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.db.impl.query;
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14 import org.simantics.db.exception.DatabaseException;
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15 import org.simantics.db.impl.graph.ReadGraphImpl;
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19 public abstract class CacheEntry {
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21 final public static int HAS_BEEN_BOUND = 1;
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23 abstract boolean isFresh();
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24 abstract boolean isReady();
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25 abstract boolean isRefuted();
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26 abstract boolean isPending();
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27 abstract boolean isDiscarded();
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28 abstract boolean isExcepted();
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30 abstract void setReady();
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31 abstract void refute();
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32 abstract void setPending();
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33 abstract void discard();
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34 abstract void except(Throwable t);
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35 abstract void setResult(Object result);
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36 abstract void clearResult(QuerySupport support);
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38 abstract void prepareRecompute(QuerySupport querySupport);
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40 abstract public Object getOriginalRequest();
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41 abstract Query getQuery();
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42 abstract <T> T getResult();
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44 abstract CacheEntry pruneFirstParents();
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45 abstract void removeParent(CacheEntry entry);
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46 abstract void addParent(CacheEntry entry);
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47 abstract boolean hasParents();
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48 abstract Iterable<CacheEntry> getParents(QueryProcessor processor);
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49 abstract CacheEntry getFirstParent(QueryProcessor processor);
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50 abstract boolean moreThanOneParent(QueryProcessor processor);
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51 abstract int parentCount(QueryProcessor processor);
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53 abstract void performFromCache(ReadGraphImpl graph, Object provider, Object procedure);
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55 abstract boolean isImmutable(ReadGraphImpl graph) throws DatabaseException;
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57 abstract boolean shouldBeCollected();
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59 abstract short getLevel();
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60 abstract short setLevel(short level);
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62 abstract int getGCStatus();
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63 abstract int setGCStatus(int status);
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64 abstract void setGCStatusFlag(int flag, boolean value);
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