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/*******************************************************************************
* Copyright (c) 2010-2016, 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.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.util.Direction;
import tools.refinery.viatra.runtime.rete.network.Node;
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.communication.CommunicationTracker;
import tools.refinery.viatra.runtime.rete.network.communication.MessageSelector;
import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
import tools.refinery.viatra.runtime.rete.network.communication.timeless.TimelessCommunicationTracker;
import tools.refinery.viatra.runtime.rete.network.mailbox.AdaptableMailbox;
import tools.refinery.viatra.runtime.rete.network.mailbox.FallThroughCapableMailbox;
/**
* This mailbox changes its behavior based on the position of its {@link Receiver} in the network topology.
* It either behaves as a {@link DefaultMailbox} or as an {@link UpdateSplittingMailbox}. The decision is made by the
* {@link CommunicationTracker}, see {@link TimelessCommunicationTracker#postProcessNode(Node)} for more details.
*
* @author Tamas Szabo
*/
public class BehaviorChangingMailbox implements FallThroughCapableMailbox {
protected boolean fallThrough;
protected boolean split;
protected AdaptableMailbox wrapped;
protected final Receiver receiver;
protected final ReteContainer container;
protected CommunicationGroup group;
public BehaviorChangingMailbox(final Receiver receiver, final ReteContainer container) {
this.fallThrough = false;
this.split = false;
this.receiver = receiver;
this.container = container;
this.wrapped = new DefaultMailbox(receiver, container);
this.wrapped.setAdapter(this);
}
@Override
public void postMessage(final Direction direction, final Tuple update, final Timestamp timestamp) {
if (this.fallThrough && !this.container.isExecutingDelayedCommands()) {
// disable fall through while we are in the middle of executing delayed construction commands
this.receiver.update(direction, update, timestamp);
} else {
this.wrapped.postMessage(direction, update, timestamp);
}
}
@Override
public void deliverAll(final MessageSelector kind) {
this.wrapped.deliverAll(kind);
}
@Override
public String toString() {
return "A_MBOX -> " + this.wrapped;
}
public void setSplitFlag(final boolean splitValue) {
if (this.split != splitValue) {
assert isEmpty();
if (splitValue) {
this.wrapped = new UpdateSplittingMailbox(this.receiver, this.container);
} else {
this.wrapped = new DefaultMailbox(this.receiver, this.container);
}
this.wrapped.setAdapter(this);
this.split = splitValue;
}
}
@Override
public boolean isEmpty() {
return this.wrapped.isEmpty();
}
@Override
public void clear() {
this.wrapped.clear();
}
@Override
public Receiver getReceiver() {
return this.receiver;
}
@Override
public CommunicationGroup getCurrentGroup() {
return this.group;
}
@Override
public void setCurrentGroup(final CommunicationGroup group) {
this.group = group;
}
@Override
public boolean isFallThrough() {
return this.fallThrough;
}
@Override
public void setFallThrough(final boolean fallThrough) {
this.fallThrough = fallThrough;
}
}
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