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/*******************************************************************************
* Copyright (c) 2010-2018, 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.viatra.runtime.rete.network.mailbox.timeless;
import tools.refinery.viatra.runtime.rete.network.Receiver;
import tools.refinery.viatra.runtime.rete.network.ReteContainer;
import tools.refinery.viatra.runtime.rete.network.communication.CommunicationGroup;
import tools.refinery.viatra.runtime.rete.network.indexer.MessageIndexer;
import tools.refinery.viatra.runtime.rete.network.mailbox.Mailbox;
import tools.refinery.viatra.runtime.rete.network.mailbox.MessageIndexerFactory;
/**
* An abstract mailbox implementation that is capable of splitting update messages based on some form of monotonicity
* (anti-monotone and monotone). The monotonicity is either defined by the less or equal operator of a poset or, it can
* be the standard subset ordering among sets of tuples.
*
* @author Tamas Szabo
* @since 2.0
*
*/
public abstract class AbstractUpdateSplittingMailbox<IndexerType extends MessageIndexer, ReceiverType extends Receiver> implements Mailbox {
protected IndexerType monotoneQueue;
protected IndexerType antiMonotoneQueue;
protected IndexerType monotoneBuffer;
protected IndexerType antiMonotoneBuffer;
protected boolean deliveringMonotone;
protected boolean deliveringAntiMonotone;
protected final ReceiverType receiver;
protected final ReteContainer container;
protected CommunicationGroup group;
public AbstractUpdateSplittingMailbox(final ReceiverType receiver, final ReteContainer container,
final MessageIndexerFactory<IndexerType> factory) {
this.receiver = receiver;
this.container = container;
this.monotoneQueue = factory.create();
this.antiMonotoneQueue = factory.create();
this.monotoneBuffer = factory.create();
this.antiMonotoneBuffer = factory.create();
this.deliveringMonotone = false;
this.deliveringAntiMonotone = false;
}
protected void swapAndClearMonotone() {
final IndexerType tmp = this.monotoneQueue;
this.monotoneQueue = this.monotoneBuffer;
this.monotoneBuffer = tmp;
this.monotoneBuffer.clear();
}
protected void swapAndClearAntiMonotone() {
final IndexerType tmp = this.antiMonotoneQueue;
this.antiMonotoneQueue = this.antiMonotoneBuffer;
this.antiMonotoneBuffer = tmp;
this.antiMonotoneBuffer.clear();
}
protected IndexerType getActiveMonotoneQueue() {
if (this.deliveringMonotone) {
return this.monotoneBuffer;
} else {
return this.monotoneQueue;
}
}
protected IndexerType getActiveAntiMonotoneQueue() {
if (this.deliveringAntiMonotone) {
return this.antiMonotoneBuffer;
} else {
return this.antiMonotoneQueue;
}
}
@Override
public ReceiverType getReceiver() {
return this.receiver;
}
@Override
public void clear() {
this.monotoneQueue.clear();
this.antiMonotoneQueue.clear();
this.monotoneBuffer.clear();
this.antiMonotoneBuffer.clear();
}
@Override
public boolean isEmpty() {
return this.getActiveMonotoneQueue().isEmpty() && this.getActiveAntiMonotoneQueue().isEmpty();
}
@Override
public CommunicationGroup getCurrentGroup() {
return this.group;
}
@Override
public void setCurrentGroup(final CommunicationGroup group) {
this.group = group;
}
}
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