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