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/*******************************************************************************
* Copyright (c) 2010-2016, Gabor Bergmann, IncQueryLabs Ltd.
* 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.single;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContext;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
import tools.refinery.viatra.runtime.matchers.util.Direction;
import tools.refinery.viatra.runtime.matchers.util.timeline.Timeline;
import tools.refinery.viatra.runtime.rete.network.NetworkStructureChangeSensitiveNode;
import tools.refinery.viatra.runtime.rete.network.Receiver;
import tools.refinery.viatra.runtime.rete.network.ReteContainer;
import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
import tools.refinery.viatra.runtime.rete.network.mailbox.Mailbox;
/**
* Node that sends tuples off to different buckets (attached as children of type {@link DiscriminatorBucketNode}), based
* on the value of a given column.
*
* <p>
* Tuple contents and bucket keys have already been wrapped using {@link IQueryRuntimeContext#wrapElement(Object)}
*
* @author Gabor Bergmann
* @since 1.5
*/
public class DiscriminatorDispatcherNode extends SingleInputNode implements NetworkStructureChangeSensitiveNode {
private int discriminationColumnIndex;
private Map<Object, DiscriminatorBucketNode> buckets = new HashMap<>();
private Map<Object, Mailbox> bucketMailboxes = new HashMap<>();
/**
* @param reteContainer
*/
public DiscriminatorDispatcherNode(ReteContainer reteContainer, int discriminationColumnIndex) {
super(reteContainer);
this.discriminationColumnIndex = discriminationColumnIndex;
}
@Override
public void update(Direction direction, Tuple updateElement, Timestamp timestamp) {
Object dispatchKey = updateElement.get(discriminationColumnIndex);
Mailbox bucketMailBox = bucketMailboxes.get(dispatchKey);
if (bucketMailBox != null) {
bucketMailBox.postMessage(direction, updateElement, timestamp);
}
}
public int getDiscriminationColumnIndex() {
return discriminationColumnIndex;
}
@Override
public void pullInto(final Collection<Tuple> collector, final boolean flush) {
propagatePullInto(collector, flush);
}
@Override
public void pullIntoWithTimeline(final Map<Tuple, Timeline<Timestamp>> collector, final boolean flush) {
propagatePullIntoWithTimestamp(collector, flush);
}
/**
* @since 2.3
*/
public void pullIntoFiltered(final Collection<Tuple> collector, final Object bucketKey, final boolean flush) {
final ArrayList<Tuple> unfiltered = new ArrayList<Tuple>();
propagatePullInto(unfiltered, flush);
for (Tuple tuple : unfiltered) {
if (bucketKey.equals(tuple.get(discriminationColumnIndex))) {
collector.add(tuple);
}
}
}
/**
* @since 2.3
*/
public void pullIntoWithTimestampFiltered(final Map<Tuple, Timeline<Timestamp>> collector, final Object bucketKey,
final boolean flush) {
final Map<Tuple, Timeline<Timestamp>> unfiltered = CollectionsFactory.createMap();
propagatePullIntoWithTimestamp(unfiltered, flush);
for (final Entry<Tuple, Timeline<Timestamp>> entry : unfiltered.entrySet()) {
if (bucketKey.equals(entry.getKey().get(discriminationColumnIndex))) {
collector.put(entry.getKey(), entry.getValue());
}
}
}
@Override
public void appendChild(Receiver receiver) {
super.appendChild(receiver);
if (receiver instanceof DiscriminatorBucketNode) {
DiscriminatorBucketNode bucket = (DiscriminatorBucketNode) receiver;
Object bucketKey = bucket.getBucketKey();
DiscriminatorBucketNode old = buckets.put(bucketKey, bucket);
if (old != null) {
throw new IllegalStateException();
}
bucketMailboxes.put(bucketKey, this.getCommunicationTracker().proxifyMailbox(this, bucket.getMailbox()));
}
}
/**
* @since 2.2
*/
public Map<Object, Mailbox> getBucketMailboxes() {
return this.bucketMailboxes;
}
@Override
public void networkStructureChanged() {
bucketMailboxes.clear();
for (Receiver receiver : children) {
if (receiver instanceof DiscriminatorBucketNode) {
DiscriminatorBucketNode bucket = (DiscriminatorBucketNode) receiver;
Object bucketKey = bucket.getBucketKey();
bucketMailboxes.put(bucketKey,
this.getCommunicationTracker().proxifyMailbox(this, bucket.getMailbox()));
}
}
}
@Override
public void removeChild(Receiver receiver) {
super.removeChild(receiver);
if (receiver instanceof DiscriminatorBucketNode) {
DiscriminatorBucketNode bucket = (DiscriminatorBucketNode) receiver;
Object bucketKey = bucket.getBucketKey();
DiscriminatorBucketNode old = buckets.remove(bucketKey);
if (old != bucket)
throw new IllegalStateException();
bucketMailboxes.remove(bucketKey);
}
}
@Override
protected String toStringCore() {
return super.toStringCore() + '<' + discriminationColumnIndex + '>';
}
}
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