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 java.util.Collection;
16 import org.simantics.db.exception.DatabaseException;
17 import org.simantics.db.impl.graph.ReadGraphImpl;
21 public abstract class CacheEntry<Procedure> {
23 final public static int HAS_BEEN_BOUND = 1;
25 abstract boolean isFresh();
26 abstract boolean isReady();
27 abstract boolean isRefuted();
28 abstract boolean isPending();
29 abstract boolean isDiscarded();
30 abstract boolean isExcepted();
32 abstract void setReady();
33 abstract void refute();
34 abstract void setPending(QuerySupport querySupport);
35 abstract void discard();
36 abstract void except(Throwable t);
37 abstract void clearResult(QuerySupport support);
39 abstract void prepareRecompute(QuerySupport querySupport);
41 abstract public Object getOriginalRequest();
42 abstract Query getQuery();
44 abstract CacheEntry pruneFirstParents();
45 abstract void removeParent(CacheEntry entry);
46 abstract void addParent(CacheEntry entry);
47 abstract boolean hasParents();
48 abstract Collection<CacheEntry<?>> getParents(QueryProcessor processor);
49 abstract CacheEntry getFirstParent(QueryProcessor processor);
50 abstract boolean moreThanOneParent(QueryProcessor processor);
51 abstract int parentCount(QueryProcessor processor);
53 abstract <T> T getResult();
54 abstract void setResult(Object result);
56 abstract Object performFromCache(ReadGraphImpl graph, Procedure procedure) throws DatabaseException;
58 abstract boolean isImmutable(ReadGraphImpl graph) throws DatabaseException;
60 abstract boolean shouldBeCollected();
62 abstract short getLevel();
63 abstract short setLevel(short level);
65 abstract int getGCStatus();
66 abstract int setGCStatus(int status);
67 abstract void setGCStatusFlag(int flag, boolean value);