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/*******************************************************************************
* Copyright (c) 2010-2019, Tamas Szabo, Istvan Rath 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.interpreter.rete.network.delayed;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;
import tools.refinery.interpreter.rete.network.communication.CommunicationTracker;
import tools.refinery.interpreter.rete.network.communication.Timestamp;
import tools.refinery.interpreter.rete.network.mailbox.Mailbox;
import tools.refinery.interpreter.matchers.tuple.Tuple;
import tools.refinery.interpreter.matchers.util.Direction;
import tools.refinery.interpreter.matchers.util.Signed;
import tools.refinery.interpreter.matchers.util.timeline.Timeline;
import tools.refinery.interpreter.rete.network.Network;
import tools.refinery.interpreter.rete.network.Node;
import tools.refinery.interpreter.rete.network.Receiver;
import tools.refinery.interpreter.rete.network.ReteContainer;
import tools.refinery.interpreter.rete.network.Supplier;
/**
* Instances of this class are responsible for initializing a {@link Receiver} with the contents of a {@link Supplier}.
* However, due to the dynamic nature of the Rete {@link Network} and to the fact that certain {@link Node}s in the
* {@link Network} are sensitive to the shape of the {@link Network}, the commands must be delayed until the
* construction of the {@link Network} has stabilized.
*
* @author Tamas Szabo
* @since 2.3
*/
public abstract class DelayedCommand implements Runnable {
protected final Supplier supplier;
protected final Receiver receiver;
protected final Direction direction;
protected final ReteContainer container;
public DelayedCommand(final Supplier supplier, final Receiver receiver, final Direction direction,
final ReteContainer container) {
this.supplier = supplier;
this.receiver = receiver;
this.direction = direction;
this.container = container;
}
@Override
public void run() {
final CommunicationTracker tracker = this.container.getCommunicationTracker();
final Mailbox mailbox = tracker.proxifyMailbox(this.supplier, this.receiver.getMailbox());
if (this.isTimestampAware()) {
final Map<Tuple, Timeline<Timestamp>> contents = this.container.pullContentsWithTimeline(this.supplier,
false);
for (final Entry<Tuple, Timeline<Timestamp>> entry : contents.entrySet()) {
for (final Signed<Timestamp> change : entry.getValue().asChangeSequence()) {
mailbox.postMessage(change.getDirection().multiply(this.direction), entry.getKey(),
change.getPayload());
}
}
} else {
final Collection<Tuple> contents = this.container.pullContents(this.supplier, false);
for (final Tuple tuple : contents) {
mailbox.postMessage(this.direction, tuple, Timestamp.ZERO);
}
}
}
@Override
public String toString() {
return this.supplier + " -> " + this.receiver.toString();
}
protected abstract boolean isTimestampAware();
}
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