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/*******************************************************************************
* Copyright (c) 2004-2008 Gabor Bergmann and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.rete.index;
import java.util.Collection;
import java.util.List;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
import tools.refinery.viatra.runtime.matchers.util.Direction;
import tools.refinery.viatra.runtime.rete.network.BaseNode;
import tools.refinery.viatra.runtime.rete.network.NetworkStructureChangeSensitiveNode;
import tools.refinery.viatra.runtime.rete.network.ReteContainer;
import tools.refinery.viatra.runtime.rete.network.Supplier;
import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
import tools.refinery.viatra.runtime.rete.traceability.TraceInfo;
/**
* An abstract standard implementation of the Indexer interface, providing common bookkeeping functionality.
*
* @author Gabor Bergmann
*
*/
public abstract class StandardIndexer extends BaseNode implements Indexer, NetworkStructureChangeSensitiveNode {
protected Supplier parent;
private final List<IndexerListener> originalListeners;
private final List<IndexerListener> proxyListeners;
protected TupleMask mask;
public StandardIndexer(ReteContainer reteContainer, TupleMask mask) {
super(reteContainer);
this.parent = null;
this.mask = mask;
this.originalListeners = CollectionsFactory.createObserverList();
this.proxyListeners = CollectionsFactory.createObserverList();
}
/**
* @since 2.4
*/
protected void propagate(Direction direction, Tuple updateElement, Tuple signature, boolean change, Timestamp timestamp) {
for (IndexerListener listener : proxyListeners) {
listener.notifyIndexerUpdate(direction, updateElement, signature, change, timestamp);
}
}
@Override
public TupleMask getMask() {
return mask;
}
@Override
public Supplier getParent() {
return parent;
}
@Override
public void attachListener(IndexerListener listener) {
this.getCommunicationTracker().registerDependency(this, listener.getOwner());
// obtain the proxy after registering the dependency because then the proxy reflects the new SCC structure
final IndexerListener proxy = this.getCommunicationTracker().proxifyIndexerListener(this, listener);
// See Bug 518434
// Must add to the first position, so that the later listeners are notified earlier.
// Thus if the beta node added as listener is also an indirect descendant of the same indexer on its opposite slot,
// then the beta node is connected later than its ancestor's listener, therefore it will be notified earlier,
// eliminating duplicate insertions and lost deletions that would result from fall-through update propagation
this.originalListeners.add(0, listener);
this.proxyListeners.add(0, proxy);
}
@Override
public void detachListener(IndexerListener listener) {
this.originalListeners.remove(listener);
IndexerListener listenerToRemove = null;
for (final IndexerListener proxyListener : this.proxyListeners) {
if (proxyListener.getOwner() == listener.getOwner()) {
listenerToRemove = proxyListener;
break;
}
}
assert listenerToRemove != null;
this.proxyListeners.remove(listenerToRemove);
this.getCommunicationTracker().unregisterDependency(this, listener.getOwner());
}
@Override
public void networkStructureChanged() {
this.proxyListeners.clear();
for (final IndexerListener original : this.originalListeners) {
this.proxyListeners.add(this.getCommunicationTracker().proxifyIndexerListener(this, original));
}
}
@Override
public Collection<IndexerListener> getListeners() {
return proxyListeners;
}
@Override
public ReteContainer getContainer() {
return reteContainer;
}
@Override
protected String toStringCore() {
return super.toStringCore() + "(" + parent + "/" + mask + ")";
}
@Override
public void assignTraceInfo(TraceInfo traceInfo) {
super.assignTraceInfo(traceInfo);
if (traceInfo.propagateFromIndexerToSupplierParent())
if (parent != null)
parent.acceptPropagatedTraceInfo(traceInfo);
}
}
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